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freebsd-nq/module/zfs/spa_stats.c

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Add visibility in to arc_read This change is an attempt to add visibility into the arc_read calls occurring on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to a call to arc_read. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each arc_read call, the following information is exported: * A unique identifier (uint64_t) * The time the entry was added to the list (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The objset ID (uint64_t) * The object number (uint64_t) * The indirection level (uint64_t) * The block ID (uint64_t) * The name of the function originating the arc_read call (char[24]) * The arc_flags from the arc_read call (uint32_t) * The PID of the reading thread (pid_t) * The command or name of thread originating read (char[16]) From this exported information one can see, in real time, exactly what is being read, what function is generating the read, and whether or not the read was found to be already cached. There is still some work to be done, but this should serve as a good starting point. Specifically, dbuf_read's are not accounted for in the currently exported information. Thus, a follow up patch should probably be added to export these calls that never call into arc_read (they only hit the dbuf hash table). In addition, it might be nice to create a utility similar to "arcstat.py" to digest the exported information and display it in a more readable format. Or perhaps, log the information and allow for it to be "replayed" at a later time. Signed-off-by: Prakash Surya <surya1@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-09-06 23:09:05 +00:00
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
#include <sys/zfs_context.h>
#include <sys/spa_impl.h>
Multi-modifier protection (MMP) Add multihost=on|off pool property to control MMP. When enabled a new thread writes uberblocks to the last slot in each label, at a set frequency, to indicate to other hosts the pool is actively imported. These uberblocks are the last synced uberblock with an updated timestamp. Property defaults to off. During tryimport, find the "best" uberblock (newest txg and timestamp) repeatedly, checking for change in the found uberblock. Include the results of the activity test in the config returned by tryimport. These results are reported to user in "zpool import". Allow the user to control the period between MMP writes, and the duration of the activity test on import, via a new module parameter zfs_multihost_interval. The period is specified in milliseconds. The activity test duration is calculated from this value, and from the mmp_delay in the "best" uberblock found initially. Add a kstat interface to export statistics about Multiple Modifier Protection (MMP) updates. Include the last synced txg number, the timestamp, the delay since the last MMP update, the VDEV GUID, the VDEV label that received the last MMP update, and the VDEV path. Abbreviated output below. $ cat /proc/spl/kstat/zfs/mypool/multihost 31 0 0x01 10 880 105092382393521 105144180101111 txg timestamp mmp_delay vdev_guid vdev_label vdev_path 20468 261337 250274925 68396651780 3 /dev/sda 20468 261339 252023374 6267402363293 1 /dev/sdc 20468 261340 252000858 6698080955233 1 /dev/sdx 20468 261341 251980635 783892869810 2 /dev/sdy 20468 261342 253385953 8923255792467 3 /dev/sdd 20468 261344 253336622 042125143176 0 /dev/sdab 20468 261345 253310522 1200778101278 2 /dev/sde 20468 261346 253286429 0950576198362 2 /dev/sdt 20468 261347 253261545 96209817917 3 /dev/sds 20468 261349 253238188 8555725937673 3 /dev/sdb Add a new tunable zfs_multihost_history to specify the number of MMP updates to store history for. By default it is set to zero meaning that no MMP statistics are stored. When using ztest to generate activity, for automated tests of the MMP function, some test functions interfere with the test. For example, the pool is exported to run zdb and then imported again. Add a new ztest function, "-M", to alter ztest behavior to prevent this. Add new tests to verify the new functionality. Tests provided by Giuseppe Di Natale. Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Ned Bass <bass6@llnl.gov> Reviewed-by: Andreas Dilger <andreas.dilger@intel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #745 Closes #6279
2017-07-08 03:20:35 +00:00
#include <sys/vdev_impl.h>
Add visibility in to arc_read This change is an attempt to add visibility into the arc_read calls occurring on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to a call to arc_read. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each arc_read call, the following information is exported: * A unique identifier (uint64_t) * The time the entry was added to the list (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The objset ID (uint64_t) * The object number (uint64_t) * The indirection level (uint64_t) * The block ID (uint64_t) * The name of the function originating the arc_read call (char[24]) * The arc_flags from the arc_read call (uint32_t) * The PID of the reading thread (pid_t) * The command or name of thread originating read (char[16]) From this exported information one can see, in real time, exactly what is being read, what function is generating the read, and whether or not the read was found to be already cached. There is still some work to be done, but this should serve as a good starting point. Specifically, dbuf_read's are not accounted for in the currently exported information. Thus, a follow up patch should probably be added to export these calls that never call into arc_read (they only hit the dbuf hash table). In addition, it might be nice to create a utility similar to "arcstat.py" to digest the exported information and display it in a more readable format. Or perhaps, log the information and allow for it to be "replayed" at a later time. Signed-off-by: Prakash Surya <surya1@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-09-06 23:09:05 +00:00
/*
* Keeps stats on last N reads per spa_t, disabled by default.
*/
int zfs_read_history = 0;
/*
* Include cache hits in history, disabled by default.
*/
int zfs_read_history_hits = 0;
Add visibility in to txg sync behavior This change is an attempt to add visibility in to how txgs are being formed on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to txg. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each txg, the following information is exported: * Unique txg number (uint64_t) * The time the txd was born (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The current txg state ((O)pen/(Q)uiescing/(S)yncing/(C)ommitted) * The number of reserved bytes for the txg (uint64_t) * The number of bytes read during the txg (uint64_t) * The number of bytes written during the txg (uint64_t) * The number of read operations during the txg (uint64_t) * The number of write operations during the txg (uint64_t) * The time the txg was closed (hrtime_t) * The time the txg was quiesced (hrtime_t) * The time the txg was synced (hrtime_t) Note that while the raw kstat now stores relative hrtimes for the open, quiesce, and sync times. Those relative times are used to calculate how long each state took and these deltas and printed by output handlers. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-10-01 16:50:50 +00:00
/*
Update the default for zfs_txg_history It's often useful to have access to txg history for debugging purposes. This patch changes the default from 0 to 100 TXGs worth of history preserved. Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed by: Richard Elling <Richard.Elling@RichardElling.com> Reviewed by: Prakash Surya <prakash.surya@delphix.com> Reviewed-by: George Melikov <mail@gmelikov.ru> Signed-off-by: Alek Pinchuk <apinchuk@datto.com> Closes #6691
2017-09-29 22:58:52 +00:00
* Keeps stats on the last 100 txgs by default.
Add visibility in to txg sync behavior This change is an attempt to add visibility in to how txgs are being formed on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to txg. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each txg, the following information is exported: * Unique txg number (uint64_t) * The time the txd was born (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The current txg state ((O)pen/(Q)uiescing/(S)yncing/(C)ommitted) * The number of reserved bytes for the txg (uint64_t) * The number of bytes read during the txg (uint64_t) * The number of bytes written during the txg (uint64_t) * The number of read operations during the txg (uint64_t) * The number of write operations during the txg (uint64_t) * The time the txg was closed (hrtime_t) * The time the txg was quiesced (hrtime_t) * The time the txg was synced (hrtime_t) Note that while the raw kstat now stores relative hrtimes for the open, quiesce, and sync times. Those relative times are used to calculate how long each state took and these deltas and printed by output handlers. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-10-01 16:50:50 +00:00
*/
Update the default for zfs_txg_history It's often useful to have access to txg history for debugging purposes. This patch changes the default from 0 to 100 TXGs worth of history preserved. Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed by: Richard Elling <Richard.Elling@RichardElling.com> Reviewed by: Prakash Surya <prakash.surya@delphix.com> Reviewed-by: George Melikov <mail@gmelikov.ru> Signed-off-by: Alek Pinchuk <apinchuk@datto.com> Closes #6691
2017-09-29 22:58:52 +00:00
int zfs_txg_history = 100;
Add visibility in to txg sync behavior This change is an attempt to add visibility in to how txgs are being formed on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to txg. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each txg, the following information is exported: * Unique txg number (uint64_t) * The time the txd was born (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The current txg state ((O)pen/(Q)uiescing/(S)yncing/(C)ommitted) * The number of reserved bytes for the txg (uint64_t) * The number of bytes read during the txg (uint64_t) * The number of bytes written during the txg (uint64_t) * The number of read operations during the txg (uint64_t) * The number of write operations during the txg (uint64_t) * The time the txg was closed (hrtime_t) * The time the txg was quiesced (hrtime_t) * The time the txg was synced (hrtime_t) Note that while the raw kstat now stores relative hrtimes for the open, quiesce, and sync times. Those relative times are used to calculate how long each state took and these deltas and printed by output handlers. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-10-01 16:50:50 +00:00
Multi-modifier protection (MMP) Add multihost=on|off pool property to control MMP. When enabled a new thread writes uberblocks to the last slot in each label, at a set frequency, to indicate to other hosts the pool is actively imported. These uberblocks are the last synced uberblock with an updated timestamp. Property defaults to off. During tryimport, find the "best" uberblock (newest txg and timestamp) repeatedly, checking for change in the found uberblock. Include the results of the activity test in the config returned by tryimport. These results are reported to user in "zpool import". Allow the user to control the period between MMP writes, and the duration of the activity test on import, via a new module parameter zfs_multihost_interval. The period is specified in milliseconds. The activity test duration is calculated from this value, and from the mmp_delay in the "best" uberblock found initially. Add a kstat interface to export statistics about Multiple Modifier Protection (MMP) updates. Include the last synced txg number, the timestamp, the delay since the last MMP update, the VDEV GUID, the VDEV label that received the last MMP update, and the VDEV path. Abbreviated output below. $ cat /proc/spl/kstat/zfs/mypool/multihost 31 0 0x01 10 880 105092382393521 105144180101111 txg timestamp mmp_delay vdev_guid vdev_label vdev_path 20468 261337 250274925 68396651780 3 /dev/sda 20468 261339 252023374 6267402363293 1 /dev/sdc 20468 261340 252000858 6698080955233 1 /dev/sdx 20468 261341 251980635 783892869810 2 /dev/sdy 20468 261342 253385953 8923255792467 3 /dev/sdd 20468 261344 253336622 042125143176 0 /dev/sdab 20468 261345 253310522 1200778101278 2 /dev/sde 20468 261346 253286429 0950576198362 2 /dev/sdt 20468 261347 253261545 96209817917 3 /dev/sds 20468 261349 253238188 8555725937673 3 /dev/sdb Add a new tunable zfs_multihost_history to specify the number of MMP updates to store history for. By default it is set to zero meaning that no MMP statistics are stored. When using ztest to generate activity, for automated tests of the MMP function, some test functions interfere with the test. For example, the pool is exported to run zdb and then imported again. Add a new ztest function, "-M", to alter ztest behavior to prevent this. Add new tests to verify the new functionality. Tests provided by Giuseppe Di Natale. Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Ned Bass <bass6@llnl.gov> Reviewed-by: Andreas Dilger <andreas.dilger@intel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #745 Closes #6279
2017-07-08 03:20:35 +00:00
/*
* Keeps stats on the last N MMP updates, disabled by default.
*/
int zfs_multihost_history = 0;
Add visibility in to arc_read This change is an attempt to add visibility into the arc_read calls occurring on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to a call to arc_read. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each arc_read call, the following information is exported: * A unique identifier (uint64_t) * The time the entry was added to the list (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The objset ID (uint64_t) * The object number (uint64_t) * The indirection level (uint64_t) * The block ID (uint64_t) * The name of the function originating the arc_read call (char[24]) * The arc_flags from the arc_read call (uint32_t) * The PID of the reading thread (pid_t) * The command or name of thread originating read (char[16]) From this exported information one can see, in real time, exactly what is being read, what function is generating the read, and whether or not the read was found to be already cached. There is still some work to be done, but this should serve as a good starting point. Specifically, dbuf_read's are not accounted for in the currently exported information. Thus, a follow up patch should probably be added to export these calls that never call into arc_read (they only hit the dbuf hash table). In addition, it might be nice to create a utility similar to "arcstat.py" to digest the exported information and display it in a more readable format. Or perhaps, log the information and allow for it to be "replayed" at a later time. Signed-off-by: Prakash Surya <surya1@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-09-06 23:09:05 +00:00
/*
* ==========================================================================
* SPA Read History Routines
* ==========================================================================
*/
/*
* Read statistics - Information exported regarding each arc_read call
*/
typedef struct spa_read_history {
uint64_t uid; /* unique identifier */
hrtime_t start; /* time read completed */
uint64_t objset; /* read from this objset */
uint64_t object; /* read of this object number */
uint64_t level; /* block's indirection level */
uint64_t blkid; /* read of this block id */
char origin[24]; /* read originated from here */
uint32_t aflags; /* ARC flags (cached, prefetch, etc.) */
pid_t pid; /* PID of task doing read */
char comm[16]; /* process name of task doing read */
list_node_t srh_link;
} spa_read_history_t;
static int
spa_read_history_headers(char *buf, size_t size)
{
Fix improper null-byte termination handling Fix a few cases where null-byte termination of strings was done unnecessarily or incorrectly. - The snprintf() function always produces a null-byte terminated string for non-negative return values, so it is not necessary to write out a null-byte as a separate step. - Also, it is unsafe to use the return value of snprintf() as an offset for placing a null-byte, because if the output was truncated the return value is the number of bytes that _would_ have been written had enough space been available. Therefore the return value may index beyond the array boundaries. - Finally, snprintf() accounts for the null-byte when limiting its output size, so there is no need to pass it a size parameter that is one less than the buffer size. Signed-off-by: Ned Bass <bass6@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #2875
2014-11-07 02:18:32 +00:00
(void) snprintf(buf, size, "%-8s %-16s %-8s %-8s %-8s %-8s %-8s "
Add visibility in to arc_read This change is an attempt to add visibility into the arc_read calls occurring on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to a call to arc_read. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each arc_read call, the following information is exported: * A unique identifier (uint64_t) * The time the entry was added to the list (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The objset ID (uint64_t) * The object number (uint64_t) * The indirection level (uint64_t) * The block ID (uint64_t) * The name of the function originating the arc_read call (char[24]) * The arc_flags from the arc_read call (uint32_t) * The PID of the reading thread (pid_t) * The command or name of thread originating read (char[16]) From this exported information one can see, in real time, exactly what is being read, what function is generating the read, and whether or not the read was found to be already cached. There is still some work to be done, but this should serve as a good starting point. Specifically, dbuf_read's are not accounted for in the currently exported information. Thus, a follow up patch should probably be added to export these calls that never call into arc_read (they only hit the dbuf hash table). In addition, it might be nice to create a utility similar to "arcstat.py" to digest the exported information and display it in a more readable format. Or perhaps, log the information and allow for it to be "replayed" at a later time. Signed-off-by: Prakash Surya <surya1@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-09-06 23:09:05 +00:00
"%-24s %-8s %-16s\n", "UID", "start", "objset", "object",
"level", "blkid", "aflags", "origin", "pid", "process");
return (0);
}
static int
spa_read_history_data(char *buf, size_t size, void *data)
{
spa_read_history_t *srh = (spa_read_history_t *)data;
Fix improper null-byte termination handling Fix a few cases where null-byte termination of strings was done unnecessarily or incorrectly. - The snprintf() function always produces a null-byte terminated string for non-negative return values, so it is not necessary to write out a null-byte as a separate step. - Also, it is unsafe to use the return value of snprintf() as an offset for placing a null-byte, because if the output was truncated the return value is the number of bytes that _would_ have been written had enough space been available. Therefore the return value may index beyond the array boundaries. - Finally, snprintf() accounts for the null-byte when limiting its output size, so there is no need to pass it a size parameter that is one less than the buffer size. Signed-off-by: Ned Bass <bass6@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #2875
2014-11-07 02:18:32 +00:00
(void) snprintf(buf, size, "%-8llu %-16llu 0x%-6llx "
Add visibility in to arc_read This change is an attempt to add visibility into the arc_read calls occurring on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to a call to arc_read. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each arc_read call, the following information is exported: * A unique identifier (uint64_t) * The time the entry was added to the list (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The objset ID (uint64_t) * The object number (uint64_t) * The indirection level (uint64_t) * The block ID (uint64_t) * The name of the function originating the arc_read call (char[24]) * The arc_flags from the arc_read call (uint32_t) * The PID of the reading thread (pid_t) * The command or name of thread originating read (char[16]) From this exported information one can see, in real time, exactly what is being read, what function is generating the read, and whether or not the read was found to be already cached. There is still some work to be done, but this should serve as a good starting point. Specifically, dbuf_read's are not accounted for in the currently exported information. Thus, a follow up patch should probably be added to export these calls that never call into arc_read (they only hit the dbuf hash table). In addition, it might be nice to create a utility similar to "arcstat.py" to digest the exported information and display it in a more readable format. Or perhaps, log the information and allow for it to be "replayed" at a later time. Signed-off-by: Prakash Surya <surya1@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-09-06 23:09:05 +00:00
"%-8lli %-8lli %-8lli 0x%-6x %-24s %-8i %-16s\n",
(u_longlong_t)srh->uid, srh->start,
(longlong_t)srh->objset, (longlong_t)srh->object,
(longlong_t)srh->level, (longlong_t)srh->blkid,
srh->aflags, srh->origin, srh->pid, srh->comm);
return (0);
}
/*
* Calculate the address for the next spa_stats_history_t entry. The
* ssh->lock will be held until ksp->ks_ndata entries are processed.
*/
static void *
spa_read_history_addr(kstat_t *ksp, loff_t n)
{
spa_t *spa = ksp->ks_private;
spa_stats_history_t *ssh = &spa->spa_stats.read_history;
ASSERT(MUTEX_HELD(&ssh->lock));
if (n == 0)
ssh->private = list_tail(&ssh->list);
else if (ssh->private)
ssh->private = list_prev(&ssh->list, ssh->private);
return (ssh->private);
}
/*
Fix spelling Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov>> Reviewed-by: George Melikov <mail@gmelikov.ru> Reviewed-by: Haakan T Johansson <f96hajo@chalmers.se> Closes #5547 Closes #5543
2017-01-03 17:31:18 +00:00
* When the kstat is written discard all spa_read_history_t entries. The
Add visibility in to arc_read This change is an attempt to add visibility into the arc_read calls occurring on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to a call to arc_read. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each arc_read call, the following information is exported: * A unique identifier (uint64_t) * The time the entry was added to the list (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The objset ID (uint64_t) * The object number (uint64_t) * The indirection level (uint64_t) * The block ID (uint64_t) * The name of the function originating the arc_read call (char[24]) * The arc_flags from the arc_read call (uint32_t) * The PID of the reading thread (pid_t) * The command or name of thread originating read (char[16]) From this exported information one can see, in real time, exactly what is being read, what function is generating the read, and whether or not the read was found to be already cached. There is still some work to be done, but this should serve as a good starting point. Specifically, dbuf_read's are not accounted for in the currently exported information. Thus, a follow up patch should probably be added to export these calls that never call into arc_read (they only hit the dbuf hash table). In addition, it might be nice to create a utility similar to "arcstat.py" to digest the exported information and display it in a more readable format. Or perhaps, log the information and allow for it to be "replayed" at a later time. Signed-off-by: Prakash Surya <surya1@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-09-06 23:09:05 +00:00
* ssh->lock will be held until ksp->ks_ndata entries are processed.
*/
static int
spa_read_history_update(kstat_t *ksp, int rw)
{
spa_t *spa = ksp->ks_private;
spa_stats_history_t *ssh = &spa->spa_stats.read_history;
if (rw == KSTAT_WRITE) {
spa_read_history_t *srh;
while ((srh = list_remove_head(&ssh->list))) {
ssh->size--;
cstyle: Resolve C style issues The vast majority of these changes are in Linux specific code. They are the result of not having an automated style checker to validate the code when it was originally written. Others were caused when the common code was slightly adjusted for Linux. This patch contains no functional changes. It only refreshes the code to conform to style guide. Everyone submitting patches for inclusion upstream should now run 'make checkstyle' and resolve any warning prior to opening a pull request. The automated builders have been updated to fail a build if when 'make checkstyle' detects an issue. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1821
2013-11-01 19:26:11 +00:00
kmem_free(srh, sizeof (spa_read_history_t));
Add visibility in to arc_read This change is an attempt to add visibility into the arc_read calls occurring on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to a call to arc_read. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each arc_read call, the following information is exported: * A unique identifier (uint64_t) * The time the entry was added to the list (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The objset ID (uint64_t) * The object number (uint64_t) * The indirection level (uint64_t) * The block ID (uint64_t) * The name of the function originating the arc_read call (char[24]) * The arc_flags from the arc_read call (uint32_t) * The PID of the reading thread (pid_t) * The command or name of thread originating read (char[16]) From this exported information one can see, in real time, exactly what is being read, what function is generating the read, and whether or not the read was found to be already cached. There is still some work to be done, but this should serve as a good starting point. Specifically, dbuf_read's are not accounted for in the currently exported information. Thus, a follow up patch should probably be added to export these calls that never call into arc_read (they only hit the dbuf hash table). In addition, it might be nice to create a utility similar to "arcstat.py" to digest the exported information and display it in a more readable format. Or perhaps, log the information and allow for it to be "replayed" at a later time. Signed-off-by: Prakash Surya <surya1@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-09-06 23:09:05 +00:00
}
ASSERT3U(ssh->size, ==, 0);
}
ksp->ks_ndata = ssh->size;
cstyle: Resolve C style issues The vast majority of these changes are in Linux specific code. They are the result of not having an automated style checker to validate the code when it was originally written. Others were caused when the common code was slightly adjusted for Linux. This patch contains no functional changes. It only refreshes the code to conform to style guide. Everyone submitting patches for inclusion upstream should now run 'make checkstyle' and resolve any warning prior to opening a pull request. The automated builders have been updated to fail a build if when 'make checkstyle' detects an issue. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1821
2013-11-01 19:26:11 +00:00
ksp->ks_data_size = ssh->size * sizeof (spa_read_history_t);
Add visibility in to arc_read This change is an attempt to add visibility into the arc_read calls occurring on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to a call to arc_read. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each arc_read call, the following information is exported: * A unique identifier (uint64_t) * The time the entry was added to the list (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The objset ID (uint64_t) * The object number (uint64_t) * The indirection level (uint64_t) * The block ID (uint64_t) * The name of the function originating the arc_read call (char[24]) * The arc_flags from the arc_read call (uint32_t) * The PID of the reading thread (pid_t) * The command or name of thread originating read (char[16]) From this exported information one can see, in real time, exactly what is being read, what function is generating the read, and whether or not the read was found to be already cached. There is still some work to be done, but this should serve as a good starting point. Specifically, dbuf_read's are not accounted for in the currently exported information. Thus, a follow up patch should probably be added to export these calls that never call into arc_read (they only hit the dbuf hash table). In addition, it might be nice to create a utility similar to "arcstat.py" to digest the exported information and display it in a more readable format. Or perhaps, log the information and allow for it to be "replayed" at a later time. Signed-off-by: Prakash Surya <surya1@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-09-06 23:09:05 +00:00
return (0);
}
static void
spa_read_history_init(spa_t *spa)
{
spa_stats_history_t *ssh = &spa->spa_stats.read_history;
Allow longer SPA names in stats The pool name can be 256 chars long. Today, in /proc/spl/kstat/zfs/ the name is limited to < 32 characters. This change is to allows bigger pool names. Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: loli10K <ezomori.nozomu@gmail.com> Reviewed-by: George Melikov <mail@gmelikov.ru> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: gaurkuma <gauravk.18@gmail.com> Closes #6481
2017-08-11 15:56:24 +00:00
char *name;
Add visibility in to arc_read This change is an attempt to add visibility into the arc_read calls occurring on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to a call to arc_read. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each arc_read call, the following information is exported: * A unique identifier (uint64_t) * The time the entry was added to the list (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The objset ID (uint64_t) * The object number (uint64_t) * The indirection level (uint64_t) * The block ID (uint64_t) * The name of the function originating the arc_read call (char[24]) * The arc_flags from the arc_read call (uint32_t) * The PID of the reading thread (pid_t) * The command or name of thread originating read (char[16]) From this exported information one can see, in real time, exactly what is being read, what function is generating the read, and whether or not the read was found to be already cached. There is still some work to be done, but this should serve as a good starting point. Specifically, dbuf_read's are not accounted for in the currently exported information. Thus, a follow up patch should probably be added to export these calls that never call into arc_read (they only hit the dbuf hash table). In addition, it might be nice to create a utility similar to "arcstat.py" to digest the exported information and display it in a more readable format. Or perhaps, log the information and allow for it to be "replayed" at a later time. Signed-off-by: Prakash Surya <surya1@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-09-06 23:09:05 +00:00
kstat_t *ksp;
mutex_init(&ssh->lock, NULL, MUTEX_DEFAULT, NULL);
list_create(&ssh->list, sizeof (spa_read_history_t),
offsetof(spa_read_history_t, srh_link));
ssh->count = 0;
ssh->size = 0;
ssh->private = NULL;
Allow longer SPA names in stats The pool name can be 256 chars long. Today, in /proc/spl/kstat/zfs/ the name is limited to < 32 characters. This change is to allows bigger pool names. Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: loli10K <ezomori.nozomu@gmail.com> Reviewed-by: George Melikov <mail@gmelikov.ru> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: gaurkuma <gauravk.18@gmail.com> Closes #6481
2017-08-11 15:56:24 +00:00
name = kmem_asprintf("zfs/%s", spa_name(spa));
Add visibility in to arc_read This change is an attempt to add visibility into the arc_read calls occurring on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to a call to arc_read. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each arc_read call, the following information is exported: * A unique identifier (uint64_t) * The time the entry was added to the list (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The objset ID (uint64_t) * The object number (uint64_t) * The indirection level (uint64_t) * The block ID (uint64_t) * The name of the function originating the arc_read call (char[24]) * The arc_flags from the arc_read call (uint32_t) * The PID of the reading thread (pid_t) * The command or name of thread originating read (char[16]) From this exported information one can see, in real time, exactly what is being read, what function is generating the read, and whether or not the read was found to be already cached. There is still some work to be done, but this should serve as a good starting point. Specifically, dbuf_read's are not accounted for in the currently exported information. Thus, a follow up patch should probably be added to export these calls that never call into arc_read (they only hit the dbuf hash table). In addition, it might be nice to create a utility similar to "arcstat.py" to digest the exported information and display it in a more readable format. Or perhaps, log the information and allow for it to be "replayed" at a later time. Signed-off-by: Prakash Surya <surya1@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-09-06 23:09:05 +00:00
ksp = kstat_create(name, 0, "reads", "misc",
KSTAT_TYPE_RAW, 0, KSTAT_FLAG_VIRTUAL);
ssh->kstat = ksp;
if (ksp) {
ksp->ks_lock = &ssh->lock;
ksp->ks_data = NULL;
ksp->ks_private = spa;
ksp->ks_update = spa_read_history_update;
kstat_set_raw_ops(ksp, spa_read_history_headers,
spa_read_history_data, spa_read_history_addr);
kstat_install(ksp);
}
Allow longer SPA names in stats The pool name can be 256 chars long. Today, in /proc/spl/kstat/zfs/ the name is limited to < 32 characters. This change is to allows bigger pool names. Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: loli10K <ezomori.nozomu@gmail.com> Reviewed-by: George Melikov <mail@gmelikov.ru> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: gaurkuma <gauravk.18@gmail.com> Closes #6481
2017-08-11 15:56:24 +00:00
strfree(name);
Add visibility in to arc_read This change is an attempt to add visibility into the arc_read calls occurring on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to a call to arc_read. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each arc_read call, the following information is exported: * A unique identifier (uint64_t) * The time the entry was added to the list (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The objset ID (uint64_t) * The object number (uint64_t) * The indirection level (uint64_t) * The block ID (uint64_t) * The name of the function originating the arc_read call (char[24]) * The arc_flags from the arc_read call (uint32_t) * The PID of the reading thread (pid_t) * The command or name of thread originating read (char[16]) From this exported information one can see, in real time, exactly what is being read, what function is generating the read, and whether or not the read was found to be already cached. There is still some work to be done, but this should serve as a good starting point. Specifically, dbuf_read's are not accounted for in the currently exported information. Thus, a follow up patch should probably be added to export these calls that never call into arc_read (they only hit the dbuf hash table). In addition, it might be nice to create a utility similar to "arcstat.py" to digest the exported information and display it in a more readable format. Or perhaps, log the information and allow for it to be "replayed" at a later time. Signed-off-by: Prakash Surya <surya1@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-09-06 23:09:05 +00:00
}
static void
spa_read_history_destroy(spa_t *spa)
{
spa_stats_history_t *ssh = &spa->spa_stats.read_history;
spa_read_history_t *srh;
kstat_t *ksp;
ksp = ssh->kstat;
if (ksp)
kstat_delete(ksp);
mutex_enter(&ssh->lock);
while ((srh = list_remove_head(&ssh->list))) {
ssh->size--;
cstyle: Resolve C style issues The vast majority of these changes are in Linux specific code. They are the result of not having an automated style checker to validate the code when it was originally written. Others were caused when the common code was slightly adjusted for Linux. This patch contains no functional changes. It only refreshes the code to conform to style guide. Everyone submitting patches for inclusion upstream should now run 'make checkstyle' and resolve any warning prior to opening a pull request. The automated builders have been updated to fail a build if when 'make checkstyle' detects an issue. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1821
2013-11-01 19:26:11 +00:00
kmem_free(srh, sizeof (spa_read_history_t));
Add visibility in to arc_read This change is an attempt to add visibility into the arc_read calls occurring on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to a call to arc_read. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each arc_read call, the following information is exported: * A unique identifier (uint64_t) * The time the entry was added to the list (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The objset ID (uint64_t) * The object number (uint64_t) * The indirection level (uint64_t) * The block ID (uint64_t) * The name of the function originating the arc_read call (char[24]) * The arc_flags from the arc_read call (uint32_t) * The PID of the reading thread (pid_t) * The command or name of thread originating read (char[16]) From this exported information one can see, in real time, exactly what is being read, what function is generating the read, and whether or not the read was found to be already cached. There is still some work to be done, but this should serve as a good starting point. Specifically, dbuf_read's are not accounted for in the currently exported information. Thus, a follow up patch should probably be added to export these calls that never call into arc_read (they only hit the dbuf hash table). In addition, it might be nice to create a utility similar to "arcstat.py" to digest the exported information and display it in a more readable format. Or perhaps, log the information and allow for it to be "replayed" at a later time. Signed-off-by: Prakash Surya <surya1@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-09-06 23:09:05 +00:00
}
ASSERT3U(ssh->size, ==, 0);
list_destroy(&ssh->list);
mutex_exit(&ssh->lock);
mutex_destroy(&ssh->lock);
}
void
Illumos 4914 - zfs on-disk bookmark structure should be named *_phys_t 4914 zfs on-disk bookmark structure should be named *_phys_t Reviewed by: George Wilson <george.wilson@delphix.com> Reviewed by: Christopher Siden <christopher.siden@delphix.com> Reviewed by: Richard Lowe <richlowe@richlowe.net> Reviewed by: Saso Kiselkov <skiselkov.ml@gmail.com> Approved by: Robert Mustacchi <rm@joyent.com> References: https://www.illumos.org/issues/4914 https://github.com/illumos/illumos-gate/commit/7802d7b Porting notes: There were a number of zfsonlinux-specific uses of zbookmark_t which needed to be updated. This should reduce the likelihood of further problems like issue #2094 from occurring. Ported by: Tim Chase <tim@chase2k.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #2558
2014-06-25 18:37:59 +00:00
spa_read_history_add(spa_t *spa, const zbookmark_phys_t *zb, uint32_t aflags)
Add visibility in to arc_read This change is an attempt to add visibility into the arc_read calls occurring on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to a call to arc_read. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each arc_read call, the following information is exported: * A unique identifier (uint64_t) * The time the entry was added to the list (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The objset ID (uint64_t) * The object number (uint64_t) * The indirection level (uint64_t) * The block ID (uint64_t) * The name of the function originating the arc_read call (char[24]) * The arc_flags from the arc_read call (uint32_t) * The PID of the reading thread (pid_t) * The command or name of thread originating read (char[16]) From this exported information one can see, in real time, exactly what is being read, what function is generating the read, and whether or not the read was found to be already cached. There is still some work to be done, but this should serve as a good starting point. Specifically, dbuf_read's are not accounted for in the currently exported information. Thus, a follow up patch should probably be added to export these calls that never call into arc_read (they only hit the dbuf hash table). In addition, it might be nice to create a utility similar to "arcstat.py" to digest the exported information and display it in a more readable format. Or perhaps, log the information and allow for it to be "replayed" at a later time. Signed-off-by: Prakash Surya <surya1@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-09-06 23:09:05 +00:00
{
spa_stats_history_t *ssh = &spa->spa_stats.read_history;
spa_read_history_t *srh, *rm;
ASSERT3P(spa, !=, NULL);
ASSERT3P(zb, !=, NULL);
if (zfs_read_history == 0 && ssh->size == 0)
return;
Illumos 5369 - arc flags should be an enum 5369 arc flags should be an enum 5370 consistent arc_buf_hdr_t naming scheme Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed by: Alex Reece <alex.reece@delphix.com> Reviewed by: Sebastien Roy <sebastien.roy@delphix.com> Reviewed by: Richard Elling <richard.elling@richardelling.com> Approved by: Richard Lowe <richlowe@richlowe.net> Porting notes: ZoL has moved some ARC definitions into arc_impl.h. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Ported by: Tim Chase <tim@chase2k.com>
2014-12-06 17:24:32 +00:00
if (zfs_read_history_hits == 0 && (aflags & ARC_FLAG_CACHED))
Add visibility in to arc_read This change is an attempt to add visibility into the arc_read calls occurring on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to a call to arc_read. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each arc_read call, the following information is exported: * A unique identifier (uint64_t) * The time the entry was added to the list (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The objset ID (uint64_t) * The object number (uint64_t) * The indirection level (uint64_t) * The block ID (uint64_t) * The name of the function originating the arc_read call (char[24]) * The arc_flags from the arc_read call (uint32_t) * The PID of the reading thread (pid_t) * The command or name of thread originating read (char[16]) From this exported information one can see, in real time, exactly what is being read, what function is generating the read, and whether or not the read was found to be already cached. There is still some work to be done, but this should serve as a good starting point. Specifically, dbuf_read's are not accounted for in the currently exported information. Thus, a follow up patch should probably be added to export these calls that never call into arc_read (they only hit the dbuf hash table). In addition, it might be nice to create a utility similar to "arcstat.py" to digest the exported information and display it in a more readable format. Or perhaps, log the information and allow for it to be "replayed" at a later time. Signed-off-by: Prakash Surya <surya1@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-09-06 23:09:05 +00:00
return;
Change KM_PUSHPAGE -> KM_SLEEP By marking DMU transaction processing contexts with PF_FSTRANS we can revert the KM_PUSHPAGE -> KM_SLEEP changes. This brings us back in line with upstream. In some cases this means simply swapping the flags back. For others fnvlist_alloc() was replaced by nvlist_alloc(..., KM_PUSHPAGE) and must be reverted back to fnvlist_alloc() which assumes KM_SLEEP. The one place KM_PUSHPAGE is kept is when allocating ARC buffers which allows us to dip in to reserved memory. This is again the same as upstream. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2014-11-21 00:09:39 +00:00
srh = kmem_zalloc(sizeof (spa_read_history_t), KM_SLEEP);
cstyle: Resolve C style issues The vast majority of these changes are in Linux specific code. They are the result of not having an automated style checker to validate the code when it was originally written. Others were caused when the common code was slightly adjusted for Linux. This patch contains no functional changes. It only refreshes the code to conform to style guide. Everyone submitting patches for inclusion upstream should now run 'make checkstyle' and resolve any warning prior to opening a pull request. The automated builders have been updated to fail a build if when 'make checkstyle' detects an issue. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1821
2013-11-01 19:26:11 +00:00
strlcpy(srh->comm, getcomm(), sizeof (srh->comm));
Add visibility in to arc_read This change is an attempt to add visibility into the arc_read calls occurring on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to a call to arc_read. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each arc_read call, the following information is exported: * A unique identifier (uint64_t) * The time the entry was added to the list (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The objset ID (uint64_t) * The object number (uint64_t) * The indirection level (uint64_t) * The block ID (uint64_t) * The name of the function originating the arc_read call (char[24]) * The arc_flags from the arc_read call (uint32_t) * The PID of the reading thread (pid_t) * The command or name of thread originating read (char[16]) From this exported information one can see, in real time, exactly what is being read, what function is generating the read, and whether or not the read was found to be already cached. There is still some work to be done, but this should serve as a good starting point. Specifically, dbuf_read's are not accounted for in the currently exported information. Thus, a follow up patch should probably be added to export these calls that never call into arc_read (they only hit the dbuf hash table). In addition, it might be nice to create a utility similar to "arcstat.py" to digest the exported information and display it in a more readable format. Or perhaps, log the information and allow for it to be "replayed" at a later time. Signed-off-by: Prakash Surya <surya1@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-09-06 23:09:05 +00:00
srh->start = gethrtime();
srh->objset = zb->zb_objset;
srh->object = zb->zb_object;
srh->level = zb->zb_level;
srh->blkid = zb->zb_blkid;
srh->aflags = aflags;
srh->pid = getpid();
mutex_enter(&ssh->lock);
srh->uid = ssh->count++;
list_insert_head(&ssh->list, srh);
ssh->size++;
while (ssh->size > zfs_read_history) {
ssh->size--;
rm = list_remove_tail(&ssh->list);
cstyle: Resolve C style issues The vast majority of these changes are in Linux specific code. They are the result of not having an automated style checker to validate the code when it was originally written. Others were caused when the common code was slightly adjusted for Linux. This patch contains no functional changes. It only refreshes the code to conform to style guide. Everyone submitting patches for inclusion upstream should now run 'make checkstyle' and resolve any warning prior to opening a pull request. The automated builders have been updated to fail a build if when 'make checkstyle' detects an issue. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1821
2013-11-01 19:26:11 +00:00
kmem_free(rm, sizeof (spa_read_history_t));
Add visibility in to arc_read This change is an attempt to add visibility into the arc_read calls occurring on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to a call to arc_read. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each arc_read call, the following information is exported: * A unique identifier (uint64_t) * The time the entry was added to the list (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The objset ID (uint64_t) * The object number (uint64_t) * The indirection level (uint64_t) * The block ID (uint64_t) * The name of the function originating the arc_read call (char[24]) * The arc_flags from the arc_read call (uint32_t) * The PID of the reading thread (pid_t) * The command or name of thread originating read (char[16]) From this exported information one can see, in real time, exactly what is being read, what function is generating the read, and whether or not the read was found to be already cached. There is still some work to be done, but this should serve as a good starting point. Specifically, dbuf_read's are not accounted for in the currently exported information. Thus, a follow up patch should probably be added to export these calls that never call into arc_read (they only hit the dbuf hash table). In addition, it might be nice to create a utility similar to "arcstat.py" to digest the exported information and display it in a more readable format. Or perhaps, log the information and allow for it to be "replayed" at a later time. Signed-off-by: Prakash Surya <surya1@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-09-06 23:09:05 +00:00
}
mutex_exit(&ssh->lock);
}
Add visibility in to txg sync behavior This change is an attempt to add visibility in to how txgs are being formed on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to txg. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each txg, the following information is exported: * Unique txg number (uint64_t) * The time the txd was born (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The current txg state ((O)pen/(Q)uiescing/(S)yncing/(C)ommitted) * The number of reserved bytes for the txg (uint64_t) * The number of bytes read during the txg (uint64_t) * The number of bytes written during the txg (uint64_t) * The number of read operations during the txg (uint64_t) * The number of write operations during the txg (uint64_t) * The time the txg was closed (hrtime_t) * The time the txg was quiesced (hrtime_t) * The time the txg was synced (hrtime_t) Note that while the raw kstat now stores relative hrtimes for the open, quiesce, and sync times. Those relative times are used to calculate how long each state took and these deltas and printed by output handlers. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-10-01 16:50:50 +00:00
/*
* ==========================================================================
* SPA TXG History Routines
* ==========================================================================
*/
/*
* Txg statistics - Information exported regarding each txg sync
*/
typedef struct spa_txg_history {
uint64_t txg; /* txg id */
txg_state_t state; /* active txg state */
uint64_t nread; /* number of bytes read */
uint64_t nwritten; /* number of bytes written */
uint64_t reads; /* number of read operations */
uint64_t writes; /* number of write operations */
replace nreserved with ndirty in txgs kstat The nreserved column in the txgs kstat file always contains 0 following the write throttle restructuring of commit e8b96c6007bf97cdf34869c1ffbd0ce753873a3d. Prior to that commit, the nreserved column showed the number of bytes temporarily reserved in the pool by a transaction group at sync time. The new write throttle did away with temporary reservations and uses the amount of dirty data instead. To approximate the old output of the txgs kstat, the number of dirty bytes per-txg was passed in as the nreserved value to spa_txg_history_set_io(). This approach did not work as intended, because the per-txg dirty value is decremented as data is written out to disk, so it is zero by the time we call spa_txg_history_set_io(). To fix this, save the number of dirty bytes before calling spa_sync(), and pass this value in to spa_txg_history_set_io(). Also, since the name "nreserved" is now a misnomer, the column heading is now labeled "ndirty". Signed-off-by: Ned Bass <bass6@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #1696
2014-02-28 00:32:36 +00:00
uint64_t ndirty; /* number of dirty bytes */
Add visibility in to txg sync behavior This change is an attempt to add visibility in to how txgs are being formed on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to txg. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each txg, the following information is exported: * Unique txg number (uint64_t) * The time the txd was born (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The current txg state ((O)pen/(Q)uiescing/(S)yncing/(C)ommitted) * The number of reserved bytes for the txg (uint64_t) * The number of bytes read during the txg (uint64_t) * The number of bytes written during the txg (uint64_t) * The number of read operations during the txg (uint64_t) * The number of write operations during the txg (uint64_t) * The time the txg was closed (hrtime_t) * The time the txg was quiesced (hrtime_t) * The time the txg was synced (hrtime_t) Note that while the raw kstat now stores relative hrtimes for the open, quiesce, and sync times. Those relative times are used to calculate how long each state took and these deltas and printed by output handlers. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-10-01 16:50:50 +00:00
hrtime_t times[TXG_STATE_COMMITTED]; /* completion times */
list_node_t sth_link;
} spa_txg_history_t;
static int
spa_txg_history_headers(char *buf, size_t size)
{
Fix improper null-byte termination handling Fix a few cases where null-byte termination of strings was done unnecessarily or incorrectly. - The snprintf() function always produces a null-byte terminated string for non-negative return values, so it is not necessary to write out a null-byte as a separate step. - Also, it is unsafe to use the return value of snprintf() as an offset for placing a null-byte, because if the output was truncated the return value is the number of bytes that _would_ have been written had enough space been available. Therefore the return value may index beyond the array boundaries. - Finally, snprintf() accounts for the null-byte when limiting its output size, so there is no need to pass it a size parameter that is one less than the buffer size. Signed-off-by: Ned Bass <bass6@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #2875
2014-11-07 02:18:32 +00:00
(void) snprintf(buf, size, "%-8s %-16s %-5s %-12s %-12s %-12s "
Add additional state TXG_STATE_WAIT_FOR_SYNC for txg. In several cases when digging into kstats we can found two txgs in SYNC state, e.g. txg birth state nreserved nread nwritten ... 985452 258127184872561 C 0 373948416 2376272384 ... 985453 258129016180616 C 0 378173440 28793344 ... 985454 258129016271523 S 0 0 0 ... 985455 258130864245986 S 0 0 0 ... 985456 258130867458851 O 0 0 0 ... However only first txg (985454) is really syncing at this moment. The other one (985455) marked as SYNCED is actually in a post-QUIESCED state and waiting to start sync. So, the new TXG_STATE_WAIT_FOR_SYNC state between TXG_STATE_QUIESCED and TXG_STATE_SYNCED was added to reveal this situation. txg birth state nreserved nread nwritten ... 1086896 235261068743969 C 0 163577856 8437248 ... 1086897 235262870830801 C 0 280625152 822594048 ... 1086898 235264172219064 S 0 0 0 ... 1086899 235264936134407 W 0 0 0 ... 1086900 235264936296156 O 0 0 0 ... Signed-off-by: Igor Lvovsky <ilvovsky@gmail.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #2075
2014-01-16 09:41:27 +00:00
"%-8s %-8s %-12s %-12s %-12s %-12s\n", "txg", "birth", "state",
replace nreserved with ndirty in txgs kstat The nreserved column in the txgs kstat file always contains 0 following the write throttle restructuring of commit e8b96c6007bf97cdf34869c1ffbd0ce753873a3d. Prior to that commit, the nreserved column showed the number of bytes temporarily reserved in the pool by a transaction group at sync time. The new write throttle did away with temporary reservations and uses the amount of dirty data instead. To approximate the old output of the txgs kstat, the number of dirty bytes per-txg was passed in as the nreserved value to spa_txg_history_set_io(). This approach did not work as intended, because the per-txg dirty value is decremented as data is written out to disk, so it is zero by the time we call spa_txg_history_set_io(). To fix this, save the number of dirty bytes before calling spa_sync(), and pass this value in to spa_txg_history_set_io(). Also, since the name "nreserved" is now a misnomer, the column heading is now labeled "ndirty". Signed-off-by: Ned Bass <bass6@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #1696
2014-02-28 00:32:36 +00:00
"ndirty", "nread", "nwritten", "reads", "writes",
Add additional state TXG_STATE_WAIT_FOR_SYNC for txg. In several cases when digging into kstats we can found two txgs in SYNC state, e.g. txg birth state nreserved nread nwritten ... 985452 258127184872561 C 0 373948416 2376272384 ... 985453 258129016180616 C 0 378173440 28793344 ... 985454 258129016271523 S 0 0 0 ... 985455 258130864245986 S 0 0 0 ... 985456 258130867458851 O 0 0 0 ... However only first txg (985454) is really syncing at this moment. The other one (985455) marked as SYNCED is actually in a post-QUIESCED state and waiting to start sync. So, the new TXG_STATE_WAIT_FOR_SYNC state between TXG_STATE_QUIESCED and TXG_STATE_SYNCED was added to reveal this situation. txg birth state nreserved nread nwritten ... 1086896 235261068743969 C 0 163577856 8437248 ... 1086897 235262870830801 C 0 280625152 822594048 ... 1086898 235264172219064 S 0 0 0 ... 1086899 235264936134407 W 0 0 0 ... 1086900 235264936296156 O 0 0 0 ... Signed-off-by: Igor Lvovsky <ilvovsky@gmail.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #2075
2014-01-16 09:41:27 +00:00
"otime", "qtime", "wtime", "stime");
Add visibility in to txg sync behavior This change is an attempt to add visibility in to how txgs are being formed on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to txg. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each txg, the following information is exported: * Unique txg number (uint64_t) * The time the txd was born (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The current txg state ((O)pen/(Q)uiescing/(S)yncing/(C)ommitted) * The number of reserved bytes for the txg (uint64_t) * The number of bytes read during the txg (uint64_t) * The number of bytes written during the txg (uint64_t) * The number of read operations during the txg (uint64_t) * The number of write operations during the txg (uint64_t) * The time the txg was closed (hrtime_t) * The time the txg was quiesced (hrtime_t) * The time the txg was synced (hrtime_t) Note that while the raw kstat now stores relative hrtimes for the open, quiesce, and sync times. Those relative times are used to calculate how long each state took and these deltas and printed by output handlers. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-10-01 16:50:50 +00:00
return (0);
}
static int
spa_txg_history_data(char *buf, size_t size, void *data)
{
spa_txg_history_t *sth = (spa_txg_history_t *)data;
Add additional state TXG_STATE_WAIT_FOR_SYNC for txg. In several cases when digging into kstats we can found two txgs in SYNC state, e.g. txg birth state nreserved nread nwritten ... 985452 258127184872561 C 0 373948416 2376272384 ... 985453 258129016180616 C 0 378173440 28793344 ... 985454 258129016271523 S 0 0 0 ... 985455 258130864245986 S 0 0 0 ... 985456 258130867458851 O 0 0 0 ... However only first txg (985454) is really syncing at this moment. The other one (985455) marked as SYNCED is actually in a post-QUIESCED state and waiting to start sync. So, the new TXG_STATE_WAIT_FOR_SYNC state between TXG_STATE_QUIESCED and TXG_STATE_SYNCED was added to reveal this situation. txg birth state nreserved nread nwritten ... 1086896 235261068743969 C 0 163577856 8437248 ... 1086897 235262870830801 C 0 280625152 822594048 ... 1086898 235264172219064 S 0 0 0 ... 1086899 235264936134407 W 0 0 0 ... 1086900 235264936296156 O 0 0 0 ... Signed-off-by: Igor Lvovsky <ilvovsky@gmail.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #2075
2014-01-16 09:41:27 +00:00
uint64_t open = 0, quiesce = 0, wait = 0, sync = 0;
Add visibility in to txg sync behavior This change is an attempt to add visibility in to how txgs are being formed on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to txg. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each txg, the following information is exported: * Unique txg number (uint64_t) * The time the txd was born (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The current txg state ((O)pen/(Q)uiescing/(S)yncing/(C)ommitted) * The number of reserved bytes for the txg (uint64_t) * The number of bytes read during the txg (uint64_t) * The number of bytes written during the txg (uint64_t) * The number of read operations during the txg (uint64_t) * The number of write operations during the txg (uint64_t) * The time the txg was closed (hrtime_t) * The time the txg was quiesced (hrtime_t) * The time the txg was synced (hrtime_t) Note that while the raw kstat now stores relative hrtimes for the open, quiesce, and sync times. Those relative times are used to calculate how long each state took and these deltas and printed by output handlers. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-10-01 16:50:50 +00:00
char state;
switch (sth->state) {
case TXG_STATE_BIRTH: state = 'B'; break;
case TXG_STATE_OPEN: state = 'O'; break;
case TXG_STATE_QUIESCED: state = 'Q'; break;
Add additional state TXG_STATE_WAIT_FOR_SYNC for txg. In several cases when digging into kstats we can found two txgs in SYNC state, e.g. txg birth state nreserved nread nwritten ... 985452 258127184872561 C 0 373948416 2376272384 ... 985453 258129016180616 C 0 378173440 28793344 ... 985454 258129016271523 S 0 0 0 ... 985455 258130864245986 S 0 0 0 ... 985456 258130867458851 O 0 0 0 ... However only first txg (985454) is really syncing at this moment. The other one (985455) marked as SYNCED is actually in a post-QUIESCED state and waiting to start sync. So, the new TXG_STATE_WAIT_FOR_SYNC state between TXG_STATE_QUIESCED and TXG_STATE_SYNCED was added to reveal this situation. txg birth state nreserved nread nwritten ... 1086896 235261068743969 C 0 163577856 8437248 ... 1086897 235262870830801 C 0 280625152 822594048 ... 1086898 235264172219064 S 0 0 0 ... 1086899 235264936134407 W 0 0 0 ... 1086900 235264936296156 O 0 0 0 ... Signed-off-by: Igor Lvovsky <ilvovsky@gmail.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #2075
2014-01-16 09:41:27 +00:00
case TXG_STATE_WAIT_FOR_SYNC: state = 'W'; break;
Add visibility in to txg sync behavior This change is an attempt to add visibility in to how txgs are being formed on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to txg. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each txg, the following information is exported: * Unique txg number (uint64_t) * The time the txd was born (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The current txg state ((O)pen/(Q)uiescing/(S)yncing/(C)ommitted) * The number of reserved bytes for the txg (uint64_t) * The number of bytes read during the txg (uint64_t) * The number of bytes written during the txg (uint64_t) * The number of read operations during the txg (uint64_t) * The number of write operations during the txg (uint64_t) * The time the txg was closed (hrtime_t) * The time the txg was quiesced (hrtime_t) * The time the txg was synced (hrtime_t) Note that while the raw kstat now stores relative hrtimes for the open, quiesce, and sync times. Those relative times are used to calculate how long each state took and these deltas and printed by output handlers. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-10-01 16:50:50 +00:00
case TXG_STATE_SYNCED: state = 'S'; break;
case TXG_STATE_COMMITTED: state = 'C'; break;
default: state = '?'; break;
}
if (sth->times[TXG_STATE_OPEN])
open = sth->times[TXG_STATE_OPEN] -
sth->times[TXG_STATE_BIRTH];
if (sth->times[TXG_STATE_QUIESCED])
quiesce = sth->times[TXG_STATE_QUIESCED] -
sth->times[TXG_STATE_OPEN];
Add additional state TXG_STATE_WAIT_FOR_SYNC for txg. In several cases when digging into kstats we can found two txgs in SYNC state, e.g. txg birth state nreserved nread nwritten ... 985452 258127184872561 C 0 373948416 2376272384 ... 985453 258129016180616 C 0 378173440 28793344 ... 985454 258129016271523 S 0 0 0 ... 985455 258130864245986 S 0 0 0 ... 985456 258130867458851 O 0 0 0 ... However only first txg (985454) is really syncing at this moment. The other one (985455) marked as SYNCED is actually in a post-QUIESCED state and waiting to start sync. So, the new TXG_STATE_WAIT_FOR_SYNC state between TXG_STATE_QUIESCED and TXG_STATE_SYNCED was added to reveal this situation. txg birth state nreserved nread nwritten ... 1086896 235261068743969 C 0 163577856 8437248 ... 1086897 235262870830801 C 0 280625152 822594048 ... 1086898 235264172219064 S 0 0 0 ... 1086899 235264936134407 W 0 0 0 ... 1086900 235264936296156 O 0 0 0 ... Signed-off-by: Igor Lvovsky <ilvovsky@gmail.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #2075
2014-01-16 09:41:27 +00:00
if (sth->times[TXG_STATE_WAIT_FOR_SYNC])
wait = sth->times[TXG_STATE_WAIT_FOR_SYNC] -
sth->times[TXG_STATE_QUIESCED];
Add visibility in to txg sync behavior This change is an attempt to add visibility in to how txgs are being formed on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to txg. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each txg, the following information is exported: * Unique txg number (uint64_t) * The time the txd was born (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The current txg state ((O)pen/(Q)uiescing/(S)yncing/(C)ommitted) * The number of reserved bytes for the txg (uint64_t) * The number of bytes read during the txg (uint64_t) * The number of bytes written during the txg (uint64_t) * The number of read operations during the txg (uint64_t) * The number of write operations during the txg (uint64_t) * The time the txg was closed (hrtime_t) * The time the txg was quiesced (hrtime_t) * The time the txg was synced (hrtime_t) Note that while the raw kstat now stores relative hrtimes for the open, quiesce, and sync times. Those relative times are used to calculate how long each state took and these deltas and printed by output handlers. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-10-01 16:50:50 +00:00
if (sth->times[TXG_STATE_SYNCED])
sync = sth->times[TXG_STATE_SYNCED] -
Add additional state TXG_STATE_WAIT_FOR_SYNC for txg. In several cases when digging into kstats we can found two txgs in SYNC state, e.g. txg birth state nreserved nread nwritten ... 985452 258127184872561 C 0 373948416 2376272384 ... 985453 258129016180616 C 0 378173440 28793344 ... 985454 258129016271523 S 0 0 0 ... 985455 258130864245986 S 0 0 0 ... 985456 258130867458851 O 0 0 0 ... However only first txg (985454) is really syncing at this moment. The other one (985455) marked as SYNCED is actually in a post-QUIESCED state and waiting to start sync. So, the new TXG_STATE_WAIT_FOR_SYNC state between TXG_STATE_QUIESCED and TXG_STATE_SYNCED was added to reveal this situation. txg birth state nreserved nread nwritten ... 1086896 235261068743969 C 0 163577856 8437248 ... 1086897 235262870830801 C 0 280625152 822594048 ... 1086898 235264172219064 S 0 0 0 ... 1086899 235264936134407 W 0 0 0 ... 1086900 235264936296156 O 0 0 0 ... Signed-off-by: Igor Lvovsky <ilvovsky@gmail.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #2075
2014-01-16 09:41:27 +00:00
sth->times[TXG_STATE_WAIT_FOR_SYNC];
Add visibility in to txg sync behavior This change is an attempt to add visibility in to how txgs are being formed on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to txg. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each txg, the following information is exported: * Unique txg number (uint64_t) * The time the txd was born (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The current txg state ((O)pen/(Q)uiescing/(S)yncing/(C)ommitted) * The number of reserved bytes for the txg (uint64_t) * The number of bytes read during the txg (uint64_t) * The number of bytes written during the txg (uint64_t) * The number of read operations during the txg (uint64_t) * The number of write operations during the txg (uint64_t) * The time the txg was closed (hrtime_t) * The time the txg was quiesced (hrtime_t) * The time the txg was synced (hrtime_t) Note that while the raw kstat now stores relative hrtimes for the open, quiesce, and sync times. Those relative times are used to calculate how long each state took and these deltas and printed by output handlers. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-10-01 16:50:50 +00:00
Fix improper null-byte termination handling Fix a few cases where null-byte termination of strings was done unnecessarily or incorrectly. - The snprintf() function always produces a null-byte terminated string for non-negative return values, so it is not necessary to write out a null-byte as a separate step. - Also, it is unsafe to use the return value of snprintf() as an offset for placing a null-byte, because if the output was truncated the return value is the number of bytes that _would_ have been written had enough space been available. Therefore the return value may index beyond the array boundaries. - Finally, snprintf() accounts for the null-byte when limiting its output size, so there is no need to pass it a size parameter that is one less than the buffer size. Signed-off-by: Ned Bass <bass6@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #2875
2014-11-07 02:18:32 +00:00
(void) snprintf(buf, size, "%-8llu %-16llu %-5c %-12llu "
Add additional state TXG_STATE_WAIT_FOR_SYNC for txg. In several cases when digging into kstats we can found two txgs in SYNC state, e.g. txg birth state nreserved nread nwritten ... 985452 258127184872561 C 0 373948416 2376272384 ... 985453 258129016180616 C 0 378173440 28793344 ... 985454 258129016271523 S 0 0 0 ... 985455 258130864245986 S 0 0 0 ... 985456 258130867458851 O 0 0 0 ... However only first txg (985454) is really syncing at this moment. The other one (985455) marked as SYNCED is actually in a post-QUIESCED state and waiting to start sync. So, the new TXG_STATE_WAIT_FOR_SYNC state between TXG_STATE_QUIESCED and TXG_STATE_SYNCED was added to reveal this situation. txg birth state nreserved nread nwritten ... 1086896 235261068743969 C 0 163577856 8437248 ... 1086897 235262870830801 C 0 280625152 822594048 ... 1086898 235264172219064 S 0 0 0 ... 1086899 235264936134407 W 0 0 0 ... 1086900 235264936296156 O 0 0 0 ... Signed-off-by: Igor Lvovsky <ilvovsky@gmail.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #2075
2014-01-16 09:41:27 +00:00
"%-12llu %-12llu %-8llu %-8llu %-12llu %-12llu %-12llu %-12llu\n",
Add visibility in to txg sync behavior This change is an attempt to add visibility in to how txgs are being formed on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to txg. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each txg, the following information is exported: * Unique txg number (uint64_t) * The time the txd was born (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The current txg state ((O)pen/(Q)uiescing/(S)yncing/(C)ommitted) * The number of reserved bytes for the txg (uint64_t) * The number of bytes read during the txg (uint64_t) * The number of bytes written during the txg (uint64_t) * The number of read operations during the txg (uint64_t) * The number of write operations during the txg (uint64_t) * The time the txg was closed (hrtime_t) * The time the txg was quiesced (hrtime_t) * The time the txg was synced (hrtime_t) Note that while the raw kstat now stores relative hrtimes for the open, quiesce, and sync times. Those relative times are used to calculate how long each state took and these deltas and printed by output handlers. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-10-01 16:50:50 +00:00
(longlong_t)sth->txg, sth->times[TXG_STATE_BIRTH], state,
replace nreserved with ndirty in txgs kstat The nreserved column in the txgs kstat file always contains 0 following the write throttle restructuring of commit e8b96c6007bf97cdf34869c1ffbd0ce753873a3d. Prior to that commit, the nreserved column showed the number of bytes temporarily reserved in the pool by a transaction group at sync time. The new write throttle did away with temporary reservations and uses the amount of dirty data instead. To approximate the old output of the txgs kstat, the number of dirty bytes per-txg was passed in as the nreserved value to spa_txg_history_set_io(). This approach did not work as intended, because the per-txg dirty value is decremented as data is written out to disk, so it is zero by the time we call spa_txg_history_set_io(). To fix this, save the number of dirty bytes before calling spa_sync(), and pass this value in to spa_txg_history_set_io(). Also, since the name "nreserved" is now a misnomer, the column heading is now labeled "ndirty". Signed-off-by: Ned Bass <bass6@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #1696
2014-02-28 00:32:36 +00:00
(u_longlong_t)sth->ndirty,
Add visibility in to txg sync behavior This change is an attempt to add visibility in to how txgs are being formed on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to txg. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each txg, the following information is exported: * Unique txg number (uint64_t) * The time the txd was born (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The current txg state ((O)pen/(Q)uiescing/(S)yncing/(C)ommitted) * The number of reserved bytes for the txg (uint64_t) * The number of bytes read during the txg (uint64_t) * The number of bytes written during the txg (uint64_t) * The number of read operations during the txg (uint64_t) * The number of write operations during the txg (uint64_t) * The time the txg was closed (hrtime_t) * The time the txg was quiesced (hrtime_t) * The time the txg was synced (hrtime_t) Note that while the raw kstat now stores relative hrtimes for the open, quiesce, and sync times. Those relative times are used to calculate how long each state took and these deltas and printed by output handlers. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-10-01 16:50:50 +00:00
(u_longlong_t)sth->nread, (u_longlong_t)sth->nwritten,
(u_longlong_t)sth->reads, (u_longlong_t)sth->writes,
Add additional state TXG_STATE_WAIT_FOR_SYNC for txg. In several cases when digging into kstats we can found two txgs in SYNC state, e.g. txg birth state nreserved nread nwritten ... 985452 258127184872561 C 0 373948416 2376272384 ... 985453 258129016180616 C 0 378173440 28793344 ... 985454 258129016271523 S 0 0 0 ... 985455 258130864245986 S 0 0 0 ... 985456 258130867458851 O 0 0 0 ... However only first txg (985454) is really syncing at this moment. The other one (985455) marked as SYNCED is actually in a post-QUIESCED state and waiting to start sync. So, the new TXG_STATE_WAIT_FOR_SYNC state between TXG_STATE_QUIESCED and TXG_STATE_SYNCED was added to reveal this situation. txg birth state nreserved nread nwritten ... 1086896 235261068743969 C 0 163577856 8437248 ... 1086897 235262870830801 C 0 280625152 822594048 ... 1086898 235264172219064 S 0 0 0 ... 1086899 235264936134407 W 0 0 0 ... 1086900 235264936296156 O 0 0 0 ... Signed-off-by: Igor Lvovsky <ilvovsky@gmail.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #2075
2014-01-16 09:41:27 +00:00
(u_longlong_t)open, (u_longlong_t)quiesce, (u_longlong_t)wait,
(u_longlong_t)sync);
Add visibility in to txg sync behavior This change is an attempt to add visibility in to how txgs are being formed on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to txg. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each txg, the following information is exported: * Unique txg number (uint64_t) * The time the txd was born (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The current txg state ((O)pen/(Q)uiescing/(S)yncing/(C)ommitted) * The number of reserved bytes for the txg (uint64_t) * The number of bytes read during the txg (uint64_t) * The number of bytes written during the txg (uint64_t) * The number of read operations during the txg (uint64_t) * The number of write operations during the txg (uint64_t) * The time the txg was closed (hrtime_t) * The time the txg was quiesced (hrtime_t) * The time the txg was synced (hrtime_t) Note that while the raw kstat now stores relative hrtimes for the open, quiesce, and sync times. Those relative times are used to calculate how long each state took and these deltas and printed by output handlers. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-10-01 16:50:50 +00:00
return (0);
}
/*
* Calculate the address for the next spa_stats_history_t entry. The
* ssh->lock will be held until ksp->ks_ndata entries are processed.
*/
static void *
spa_txg_history_addr(kstat_t *ksp, loff_t n)
{
spa_t *spa = ksp->ks_private;
spa_stats_history_t *ssh = &spa->spa_stats.txg_history;
ASSERT(MUTEX_HELD(&ssh->lock));
if (n == 0)
ssh->private = list_tail(&ssh->list);
else if (ssh->private)
ssh->private = list_prev(&ssh->list, ssh->private);
return (ssh->private);
}
/*
Fix spelling Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov>> Reviewed-by: George Melikov <mail@gmelikov.ru> Reviewed-by: Haakan T Johansson <f96hajo@chalmers.se> Closes #5547 Closes #5543
2017-01-03 17:31:18 +00:00
* When the kstat is written discard all spa_txg_history_t entries. The
Add visibility in to txg sync behavior This change is an attempt to add visibility in to how txgs are being formed on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to txg. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each txg, the following information is exported: * Unique txg number (uint64_t) * The time the txd was born (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The current txg state ((O)pen/(Q)uiescing/(S)yncing/(C)ommitted) * The number of reserved bytes for the txg (uint64_t) * The number of bytes read during the txg (uint64_t) * The number of bytes written during the txg (uint64_t) * The number of read operations during the txg (uint64_t) * The number of write operations during the txg (uint64_t) * The time the txg was closed (hrtime_t) * The time the txg was quiesced (hrtime_t) * The time the txg was synced (hrtime_t) Note that while the raw kstat now stores relative hrtimes for the open, quiesce, and sync times. Those relative times are used to calculate how long each state took and these deltas and printed by output handlers. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-10-01 16:50:50 +00:00
* ssh->lock will be held until ksp->ks_ndata entries are processed.
*/
static int
spa_txg_history_update(kstat_t *ksp, int rw)
{
spa_t *spa = ksp->ks_private;
spa_stats_history_t *ssh = &spa->spa_stats.txg_history;
ASSERT(MUTEX_HELD(&ssh->lock));
if (rw == KSTAT_WRITE) {
spa_txg_history_t *sth;
while ((sth = list_remove_head(&ssh->list))) {
ssh->size--;
cstyle: Resolve C style issues The vast majority of these changes are in Linux specific code. They are the result of not having an automated style checker to validate the code when it was originally written. Others were caused when the common code was slightly adjusted for Linux. This patch contains no functional changes. It only refreshes the code to conform to style guide. Everyone submitting patches for inclusion upstream should now run 'make checkstyle' and resolve any warning prior to opening a pull request. The automated builders have been updated to fail a build if when 'make checkstyle' detects an issue. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1821
2013-11-01 19:26:11 +00:00
kmem_free(sth, sizeof (spa_txg_history_t));
Add visibility in to txg sync behavior This change is an attempt to add visibility in to how txgs are being formed on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to txg. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each txg, the following information is exported: * Unique txg number (uint64_t) * The time the txd was born (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The current txg state ((O)pen/(Q)uiescing/(S)yncing/(C)ommitted) * The number of reserved bytes for the txg (uint64_t) * The number of bytes read during the txg (uint64_t) * The number of bytes written during the txg (uint64_t) * The number of read operations during the txg (uint64_t) * The number of write operations during the txg (uint64_t) * The time the txg was closed (hrtime_t) * The time the txg was quiesced (hrtime_t) * The time the txg was synced (hrtime_t) Note that while the raw kstat now stores relative hrtimes for the open, quiesce, and sync times. Those relative times are used to calculate how long each state took and these deltas and printed by output handlers. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-10-01 16:50:50 +00:00
}
ASSERT3U(ssh->size, ==, 0);
}
ksp->ks_ndata = ssh->size;
cstyle: Resolve C style issues The vast majority of these changes are in Linux specific code. They are the result of not having an automated style checker to validate the code when it was originally written. Others were caused when the common code was slightly adjusted for Linux. This patch contains no functional changes. It only refreshes the code to conform to style guide. Everyone submitting patches for inclusion upstream should now run 'make checkstyle' and resolve any warning prior to opening a pull request. The automated builders have been updated to fail a build if when 'make checkstyle' detects an issue. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1821
2013-11-01 19:26:11 +00:00
ksp->ks_data_size = ssh->size * sizeof (spa_txg_history_t);
Add visibility in to txg sync behavior This change is an attempt to add visibility in to how txgs are being formed on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to txg. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each txg, the following information is exported: * Unique txg number (uint64_t) * The time the txd was born (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The current txg state ((O)pen/(Q)uiescing/(S)yncing/(C)ommitted) * The number of reserved bytes for the txg (uint64_t) * The number of bytes read during the txg (uint64_t) * The number of bytes written during the txg (uint64_t) * The number of read operations during the txg (uint64_t) * The number of write operations during the txg (uint64_t) * The time the txg was closed (hrtime_t) * The time the txg was quiesced (hrtime_t) * The time the txg was synced (hrtime_t) Note that while the raw kstat now stores relative hrtimes for the open, quiesce, and sync times. Those relative times are used to calculate how long each state took and these deltas and printed by output handlers. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-10-01 16:50:50 +00:00
return (0);
}
static void
spa_txg_history_init(spa_t *spa)
{
spa_stats_history_t *ssh = &spa->spa_stats.txg_history;
Allow longer SPA names in stats The pool name can be 256 chars long. Today, in /proc/spl/kstat/zfs/ the name is limited to < 32 characters. This change is to allows bigger pool names. Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: loli10K <ezomori.nozomu@gmail.com> Reviewed-by: George Melikov <mail@gmelikov.ru> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: gaurkuma <gauravk.18@gmail.com> Closes #6481
2017-08-11 15:56:24 +00:00
char *name;
Add visibility in to txg sync behavior This change is an attempt to add visibility in to how txgs are being formed on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to txg. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each txg, the following information is exported: * Unique txg number (uint64_t) * The time the txd was born (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The current txg state ((O)pen/(Q)uiescing/(S)yncing/(C)ommitted) * The number of reserved bytes for the txg (uint64_t) * The number of bytes read during the txg (uint64_t) * The number of bytes written during the txg (uint64_t) * The number of read operations during the txg (uint64_t) * The number of write operations during the txg (uint64_t) * The time the txg was closed (hrtime_t) * The time the txg was quiesced (hrtime_t) * The time the txg was synced (hrtime_t) Note that while the raw kstat now stores relative hrtimes for the open, quiesce, and sync times. Those relative times are used to calculate how long each state took and these deltas and printed by output handlers. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-10-01 16:50:50 +00:00
kstat_t *ksp;
mutex_init(&ssh->lock, NULL, MUTEX_DEFAULT, NULL);
list_create(&ssh->list, sizeof (spa_txg_history_t),
offsetof(spa_txg_history_t, sth_link));
ssh->count = 0;
ssh->size = 0;
ssh->private = NULL;
Allow longer SPA names in stats The pool name can be 256 chars long. Today, in /proc/spl/kstat/zfs/ the name is limited to < 32 characters. This change is to allows bigger pool names. Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: loli10K <ezomori.nozomu@gmail.com> Reviewed-by: George Melikov <mail@gmelikov.ru> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: gaurkuma <gauravk.18@gmail.com> Closes #6481
2017-08-11 15:56:24 +00:00
name = kmem_asprintf("zfs/%s", spa_name(spa));
Add visibility in to txg sync behavior This change is an attempt to add visibility in to how txgs are being formed on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to txg. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each txg, the following information is exported: * Unique txg number (uint64_t) * The time the txd was born (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The current txg state ((O)pen/(Q)uiescing/(S)yncing/(C)ommitted) * The number of reserved bytes for the txg (uint64_t) * The number of bytes read during the txg (uint64_t) * The number of bytes written during the txg (uint64_t) * The number of read operations during the txg (uint64_t) * The number of write operations during the txg (uint64_t) * The time the txg was closed (hrtime_t) * The time the txg was quiesced (hrtime_t) * The time the txg was synced (hrtime_t) Note that while the raw kstat now stores relative hrtimes for the open, quiesce, and sync times. Those relative times are used to calculate how long each state took and these deltas and printed by output handlers. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-10-01 16:50:50 +00:00
ksp = kstat_create(name, 0, "txgs", "misc",
KSTAT_TYPE_RAW, 0, KSTAT_FLAG_VIRTUAL);
ssh->kstat = ksp;
if (ksp) {
ksp->ks_lock = &ssh->lock;
ksp->ks_data = NULL;
ksp->ks_private = spa;
ksp->ks_update = spa_txg_history_update;
kstat_set_raw_ops(ksp, spa_txg_history_headers,
spa_txg_history_data, spa_txg_history_addr);
kstat_install(ksp);
}
Allow longer SPA names in stats The pool name can be 256 chars long. Today, in /proc/spl/kstat/zfs/ the name is limited to < 32 characters. This change is to allows bigger pool names. Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: loli10K <ezomori.nozomu@gmail.com> Reviewed-by: George Melikov <mail@gmelikov.ru> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: gaurkuma <gauravk.18@gmail.com> Closes #6481
2017-08-11 15:56:24 +00:00
strfree(name);
Add visibility in to txg sync behavior This change is an attempt to add visibility in to how txgs are being formed on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to txg. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each txg, the following information is exported: * Unique txg number (uint64_t) * The time the txd was born (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The current txg state ((O)pen/(Q)uiescing/(S)yncing/(C)ommitted) * The number of reserved bytes for the txg (uint64_t) * The number of bytes read during the txg (uint64_t) * The number of bytes written during the txg (uint64_t) * The number of read operations during the txg (uint64_t) * The number of write operations during the txg (uint64_t) * The time the txg was closed (hrtime_t) * The time the txg was quiesced (hrtime_t) * The time the txg was synced (hrtime_t) Note that while the raw kstat now stores relative hrtimes for the open, quiesce, and sync times. Those relative times are used to calculate how long each state took and these deltas and printed by output handlers. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-10-01 16:50:50 +00:00
}
static void
spa_txg_history_destroy(spa_t *spa)
{
spa_stats_history_t *ssh = &spa->spa_stats.txg_history;
spa_txg_history_t *sth;
kstat_t *ksp;
ksp = ssh->kstat;
if (ksp)
kstat_delete(ksp);
mutex_enter(&ssh->lock);
while ((sth = list_remove_head(&ssh->list))) {
ssh->size--;
cstyle: Resolve C style issues The vast majority of these changes are in Linux specific code. They are the result of not having an automated style checker to validate the code when it was originally written. Others were caused when the common code was slightly adjusted for Linux. This patch contains no functional changes. It only refreshes the code to conform to style guide. Everyone submitting patches for inclusion upstream should now run 'make checkstyle' and resolve any warning prior to opening a pull request. The automated builders have been updated to fail a build if when 'make checkstyle' detects an issue. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1821
2013-11-01 19:26:11 +00:00
kmem_free(sth, sizeof (spa_txg_history_t));
Add visibility in to txg sync behavior This change is an attempt to add visibility in to how txgs are being formed on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to txg. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each txg, the following information is exported: * Unique txg number (uint64_t) * The time the txd was born (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The current txg state ((O)pen/(Q)uiescing/(S)yncing/(C)ommitted) * The number of reserved bytes for the txg (uint64_t) * The number of bytes read during the txg (uint64_t) * The number of bytes written during the txg (uint64_t) * The number of read operations during the txg (uint64_t) * The number of write operations during the txg (uint64_t) * The time the txg was closed (hrtime_t) * The time the txg was quiesced (hrtime_t) * The time the txg was synced (hrtime_t) Note that while the raw kstat now stores relative hrtimes for the open, quiesce, and sync times. Those relative times are used to calculate how long each state took and these deltas and printed by output handlers. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-10-01 16:50:50 +00:00
}
ASSERT3U(ssh->size, ==, 0);
list_destroy(&ssh->list);
mutex_exit(&ssh->lock);
mutex_destroy(&ssh->lock);
}
/*
* Add a new txg to historical record.
*/
void
Call gethrtime() only once per new txg creation When transitioning current open TXG into QUIESCE state and opening a new one txg_quiesce() calls gethrtime(): - to mark the birth time of the new TXG - to record the SPA txg history kstat - implicitely inside spa_txg_history_add() These timestamps are practically the same, so that the first one can be used instead of the other two. The only visible difference is that inside spa_txg_history_add() the time spent in kmem_zalloc() will be counted towards the opened TXG. Since at this point the new TXG already exists (tx->tx_open_txg has been already incremented) it is actually a correct accounting. In any case this extra work is only happening when spa_txg_history kstat is activated (i.e. zfs_txg_history > 0) and doesn't affect the normal processing in any way. Signed-off-by: Cyril Plisko <cyril.plisko@mountall.com> Issue #2075
2014-01-15 09:26:12 +00:00
spa_txg_history_add(spa_t *spa, uint64_t txg, hrtime_t birth_time)
Add visibility in to txg sync behavior This change is an attempt to add visibility in to how txgs are being formed on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to txg. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each txg, the following information is exported: * Unique txg number (uint64_t) * The time the txd was born (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The current txg state ((O)pen/(Q)uiescing/(S)yncing/(C)ommitted) * The number of reserved bytes for the txg (uint64_t) * The number of bytes read during the txg (uint64_t) * The number of bytes written during the txg (uint64_t) * The number of read operations during the txg (uint64_t) * The number of write operations during the txg (uint64_t) * The time the txg was closed (hrtime_t) * The time the txg was quiesced (hrtime_t) * The time the txg was synced (hrtime_t) Note that while the raw kstat now stores relative hrtimes for the open, quiesce, and sync times. Those relative times are used to calculate how long each state took and these deltas and printed by output handlers. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-10-01 16:50:50 +00:00
{
spa_stats_history_t *ssh = &spa->spa_stats.txg_history;
spa_txg_history_t *sth, *rm;
if (zfs_txg_history == 0 && ssh->size == 0)
return;
Change KM_PUSHPAGE -> KM_SLEEP By marking DMU transaction processing contexts with PF_FSTRANS we can revert the KM_PUSHPAGE -> KM_SLEEP changes. This brings us back in line with upstream. In some cases this means simply swapping the flags back. For others fnvlist_alloc() was replaced by nvlist_alloc(..., KM_PUSHPAGE) and must be reverted back to fnvlist_alloc() which assumes KM_SLEEP. The one place KM_PUSHPAGE is kept is when allocating ARC buffers which allows us to dip in to reserved memory. This is again the same as upstream. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2014-11-21 00:09:39 +00:00
sth = kmem_zalloc(sizeof (spa_txg_history_t), KM_SLEEP);
Add visibility in to txg sync behavior This change is an attempt to add visibility in to how txgs are being formed on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to txg. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each txg, the following information is exported: * Unique txg number (uint64_t) * The time the txd was born (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The current txg state ((O)pen/(Q)uiescing/(S)yncing/(C)ommitted) * The number of reserved bytes for the txg (uint64_t) * The number of bytes read during the txg (uint64_t) * The number of bytes written during the txg (uint64_t) * The number of read operations during the txg (uint64_t) * The number of write operations during the txg (uint64_t) * The time the txg was closed (hrtime_t) * The time the txg was quiesced (hrtime_t) * The time the txg was synced (hrtime_t) Note that while the raw kstat now stores relative hrtimes for the open, quiesce, and sync times. Those relative times are used to calculate how long each state took and these deltas and printed by output handlers. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-10-01 16:50:50 +00:00
sth->txg = txg;
sth->state = TXG_STATE_OPEN;
Call gethrtime() only once per new txg creation When transitioning current open TXG into QUIESCE state and opening a new one txg_quiesce() calls gethrtime(): - to mark the birth time of the new TXG - to record the SPA txg history kstat - implicitely inside spa_txg_history_add() These timestamps are practically the same, so that the first one can be used instead of the other two. The only visible difference is that inside spa_txg_history_add() the time spent in kmem_zalloc() will be counted towards the opened TXG. Since at this point the new TXG already exists (tx->tx_open_txg has been already incremented) it is actually a correct accounting. In any case this extra work is only happening when spa_txg_history kstat is activated (i.e. zfs_txg_history > 0) and doesn't affect the normal processing in any way. Signed-off-by: Cyril Plisko <cyril.plisko@mountall.com> Issue #2075
2014-01-15 09:26:12 +00:00
sth->times[TXG_STATE_BIRTH] = birth_time;
Add visibility in to txg sync behavior This change is an attempt to add visibility in to how txgs are being formed on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to txg. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each txg, the following information is exported: * Unique txg number (uint64_t) * The time the txd was born (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The current txg state ((O)pen/(Q)uiescing/(S)yncing/(C)ommitted) * The number of reserved bytes for the txg (uint64_t) * The number of bytes read during the txg (uint64_t) * The number of bytes written during the txg (uint64_t) * The number of read operations during the txg (uint64_t) * The number of write operations during the txg (uint64_t) * The time the txg was closed (hrtime_t) * The time the txg was quiesced (hrtime_t) * The time the txg was synced (hrtime_t) Note that while the raw kstat now stores relative hrtimes for the open, quiesce, and sync times. Those relative times are used to calculate how long each state took and these deltas and printed by output handlers. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-10-01 16:50:50 +00:00
mutex_enter(&ssh->lock);
list_insert_head(&ssh->list, sth);
ssh->size++;
while (ssh->size > zfs_txg_history) {
ssh->size--;
rm = list_remove_tail(&ssh->list);
cstyle: Resolve C style issues The vast majority of these changes are in Linux specific code. They are the result of not having an automated style checker to validate the code when it was originally written. Others were caused when the common code was slightly adjusted for Linux. This patch contains no functional changes. It only refreshes the code to conform to style guide. Everyone submitting patches for inclusion upstream should now run 'make checkstyle' and resolve any warning prior to opening a pull request. The automated builders have been updated to fail a build if when 'make checkstyle' detects an issue. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1821
2013-11-01 19:26:11 +00:00
kmem_free(rm, sizeof (spa_txg_history_t));
Add visibility in to txg sync behavior This change is an attempt to add visibility in to how txgs are being formed on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to txg. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each txg, the following information is exported: * Unique txg number (uint64_t) * The time the txd was born (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The current txg state ((O)pen/(Q)uiescing/(S)yncing/(C)ommitted) * The number of reserved bytes for the txg (uint64_t) * The number of bytes read during the txg (uint64_t) * The number of bytes written during the txg (uint64_t) * The number of read operations during the txg (uint64_t) * The number of write operations during the txg (uint64_t) * The time the txg was closed (hrtime_t) * The time the txg was quiesced (hrtime_t) * The time the txg was synced (hrtime_t) Note that while the raw kstat now stores relative hrtimes for the open, quiesce, and sync times. Those relative times are used to calculate how long each state took and these deltas and printed by output handlers. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-10-01 16:50:50 +00:00
}
mutex_exit(&ssh->lock);
}
/*
* Set txg state completion time and increment current state.
*/
int
spa_txg_history_set(spa_t *spa, uint64_t txg, txg_state_t completed_state,
hrtime_t completed_time)
{
spa_stats_history_t *ssh = &spa->spa_stats.txg_history;
spa_txg_history_t *sth;
int error = ENOENT;
if (zfs_txg_history == 0)
return (0);
mutex_enter(&ssh->lock);
for (sth = list_head(&ssh->list); sth != NULL;
cstyle: Resolve C style issues The vast majority of these changes are in Linux specific code. They are the result of not having an automated style checker to validate the code when it was originally written. Others were caused when the common code was slightly adjusted for Linux. This patch contains no functional changes. It only refreshes the code to conform to style guide. Everyone submitting patches for inclusion upstream should now run 'make checkstyle' and resolve any warning prior to opening a pull request. The automated builders have been updated to fail a build if when 'make checkstyle' detects an issue. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1821
2013-11-01 19:26:11 +00:00
sth = list_next(&ssh->list, sth)) {
Add visibility in to txg sync behavior This change is an attempt to add visibility in to how txgs are being formed on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to txg. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each txg, the following information is exported: * Unique txg number (uint64_t) * The time the txd was born (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The current txg state ((O)pen/(Q)uiescing/(S)yncing/(C)ommitted) * The number of reserved bytes for the txg (uint64_t) * The number of bytes read during the txg (uint64_t) * The number of bytes written during the txg (uint64_t) * The number of read operations during the txg (uint64_t) * The number of write operations during the txg (uint64_t) * The time the txg was closed (hrtime_t) * The time the txg was quiesced (hrtime_t) * The time the txg was synced (hrtime_t) Note that while the raw kstat now stores relative hrtimes for the open, quiesce, and sync times. Those relative times are used to calculate how long each state took and these deltas and printed by output handlers. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-10-01 16:50:50 +00:00
if (sth->txg == txg) {
sth->times[completed_state] = completed_time;
sth->state++;
error = 0;
break;
}
}
mutex_exit(&ssh->lock);
return (error);
}
/*
* Set txg IO stats.
*/
Refactor txg history kstat It was observed that even when the txg history is disabled by setting `zfs_txg_history=0` the txg_sync thread still fetches the vdev stats unnecessarily. This patch refactors the code such that vdev_get_stats() is no longer called when `zfs_txg_history=0`. And it further reduces the differences between upstream and the ZoL txg_sync_thread() function. Reviewed-by: Tony Hutter <hutter2@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #5412
2016-12-02 23:57:49 +00:00
static int
Add visibility in to txg sync behavior This change is an attempt to add visibility in to how txgs are being formed on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to txg. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each txg, the following information is exported: * Unique txg number (uint64_t) * The time the txd was born (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The current txg state ((O)pen/(Q)uiescing/(S)yncing/(C)ommitted) * The number of reserved bytes for the txg (uint64_t) * The number of bytes read during the txg (uint64_t) * The number of bytes written during the txg (uint64_t) * The number of read operations during the txg (uint64_t) * The number of write operations during the txg (uint64_t) * The time the txg was closed (hrtime_t) * The time the txg was quiesced (hrtime_t) * The time the txg was synced (hrtime_t) Note that while the raw kstat now stores relative hrtimes for the open, quiesce, and sync times. Those relative times are used to calculate how long each state took and these deltas and printed by output handlers. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-10-01 16:50:50 +00:00
spa_txg_history_set_io(spa_t *spa, uint64_t txg, uint64_t nread,
replace nreserved with ndirty in txgs kstat The nreserved column in the txgs kstat file always contains 0 following the write throttle restructuring of commit e8b96c6007bf97cdf34869c1ffbd0ce753873a3d. Prior to that commit, the nreserved column showed the number of bytes temporarily reserved in the pool by a transaction group at sync time. The new write throttle did away with temporary reservations and uses the amount of dirty data instead. To approximate the old output of the txgs kstat, the number of dirty bytes per-txg was passed in as the nreserved value to spa_txg_history_set_io(). This approach did not work as intended, because the per-txg dirty value is decremented as data is written out to disk, so it is zero by the time we call spa_txg_history_set_io(). To fix this, save the number of dirty bytes before calling spa_sync(), and pass this value in to spa_txg_history_set_io(). Also, since the name "nreserved" is now a misnomer, the column heading is now labeled "ndirty". Signed-off-by: Ned Bass <bass6@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #1696
2014-02-28 00:32:36 +00:00
uint64_t nwritten, uint64_t reads, uint64_t writes, uint64_t ndirty)
Add visibility in to txg sync behavior This change is an attempt to add visibility in to how txgs are being formed on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to txg. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each txg, the following information is exported: * Unique txg number (uint64_t) * The time the txd was born (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The current txg state ((O)pen/(Q)uiescing/(S)yncing/(C)ommitted) * The number of reserved bytes for the txg (uint64_t) * The number of bytes read during the txg (uint64_t) * The number of bytes written during the txg (uint64_t) * The number of read operations during the txg (uint64_t) * The number of write operations during the txg (uint64_t) * The time the txg was closed (hrtime_t) * The time the txg was quiesced (hrtime_t) * The time the txg was synced (hrtime_t) Note that while the raw kstat now stores relative hrtimes for the open, quiesce, and sync times. Those relative times are used to calculate how long each state took and these deltas and printed by output handlers. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-10-01 16:50:50 +00:00
{
spa_stats_history_t *ssh = &spa->spa_stats.txg_history;
spa_txg_history_t *sth;
int error = ENOENT;
if (zfs_txg_history == 0)
return (0);
mutex_enter(&ssh->lock);
for (sth = list_head(&ssh->list); sth != NULL;
cstyle: Resolve C style issues The vast majority of these changes are in Linux specific code. They are the result of not having an automated style checker to validate the code when it was originally written. Others were caused when the common code was slightly adjusted for Linux. This patch contains no functional changes. It only refreshes the code to conform to style guide. Everyone submitting patches for inclusion upstream should now run 'make checkstyle' and resolve any warning prior to opening a pull request. The automated builders have been updated to fail a build if when 'make checkstyle' detects an issue. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1821
2013-11-01 19:26:11 +00:00
sth = list_next(&ssh->list, sth)) {
Add visibility in to txg sync behavior This change is an attempt to add visibility in to how txgs are being formed on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to txg. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each txg, the following information is exported: * Unique txg number (uint64_t) * The time the txd was born (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The current txg state ((O)pen/(Q)uiescing/(S)yncing/(C)ommitted) * The number of reserved bytes for the txg (uint64_t) * The number of bytes read during the txg (uint64_t) * The number of bytes written during the txg (uint64_t) * The number of read operations during the txg (uint64_t) * The number of write operations during the txg (uint64_t) * The time the txg was closed (hrtime_t) * The time the txg was quiesced (hrtime_t) * The time the txg was synced (hrtime_t) Note that while the raw kstat now stores relative hrtimes for the open, quiesce, and sync times. Those relative times are used to calculate how long each state took and these deltas and printed by output handlers. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-10-01 16:50:50 +00:00
if (sth->txg == txg) {
sth->nread = nread;
sth->nwritten = nwritten;
sth->reads = reads;
sth->writes = writes;
replace nreserved with ndirty in txgs kstat The nreserved column in the txgs kstat file always contains 0 following the write throttle restructuring of commit e8b96c6007bf97cdf34869c1ffbd0ce753873a3d. Prior to that commit, the nreserved column showed the number of bytes temporarily reserved in the pool by a transaction group at sync time. The new write throttle did away with temporary reservations and uses the amount of dirty data instead. To approximate the old output of the txgs kstat, the number of dirty bytes per-txg was passed in as the nreserved value to spa_txg_history_set_io(). This approach did not work as intended, because the per-txg dirty value is decremented as data is written out to disk, so it is zero by the time we call spa_txg_history_set_io(). To fix this, save the number of dirty bytes before calling spa_sync(), and pass this value in to spa_txg_history_set_io(). Also, since the name "nreserved" is now a misnomer, the column heading is now labeled "ndirty". Signed-off-by: Ned Bass <bass6@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #1696
2014-02-28 00:32:36 +00:00
sth->ndirty = ndirty;
Add visibility in to txg sync behavior This change is an attempt to add visibility in to how txgs are being formed on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to txg. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each txg, the following information is exported: * Unique txg number (uint64_t) * The time the txd was born (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The current txg state ((O)pen/(Q)uiescing/(S)yncing/(C)ommitted) * The number of reserved bytes for the txg (uint64_t) * The number of bytes read during the txg (uint64_t) * The number of bytes written during the txg (uint64_t) * The number of read operations during the txg (uint64_t) * The number of write operations during the txg (uint64_t) * The time the txg was closed (hrtime_t) * The time the txg was quiesced (hrtime_t) * The time the txg was synced (hrtime_t) Note that while the raw kstat now stores relative hrtimes for the open, quiesce, and sync times. Those relative times are used to calculate how long each state took and these deltas and printed by output handlers. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-10-01 16:50:50 +00:00
error = 0;
break;
}
}
mutex_exit(&ssh->lock);
return (error);
}
Refactor txg history kstat It was observed that even when the txg history is disabled by setting `zfs_txg_history=0` the txg_sync thread still fetches the vdev stats unnecessarily. This patch refactors the code such that vdev_get_stats() is no longer called when `zfs_txg_history=0`. And it further reduces the differences between upstream and the ZoL txg_sync_thread() function. Reviewed-by: Tony Hutter <hutter2@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #5412
2016-12-02 23:57:49 +00:00
txg_stat_t *
spa_txg_history_init_io(spa_t *spa, uint64_t txg, dsl_pool_t *dp)
{
txg_stat_t *ts;
if (zfs_txg_history == 0)
return (NULL);
ts = kmem_alloc(sizeof (txg_stat_t), KM_SLEEP);
spa_config_enter(spa, SCL_ALL, FTAG, RW_READER);
vdev_get_stats(spa->spa_root_vdev, &ts->vs1);
spa_config_exit(spa, SCL_ALL, FTAG);
ts->txg = txg;
ts->ndirty = dp->dp_dirty_pertxg[txg & TXG_MASK];
spa_txg_history_set(spa, txg, TXG_STATE_WAIT_FOR_SYNC, gethrtime());
return (ts);
}
void
spa_txg_history_fini_io(spa_t *spa, txg_stat_t *ts)
{
if (ts == NULL)
return;
if (zfs_txg_history == 0) {
kmem_free(ts, sizeof (txg_stat_t));
return;
}
spa_config_enter(spa, SCL_ALL, FTAG, RW_READER);
vdev_get_stats(spa->spa_root_vdev, &ts->vs2);
spa_config_exit(spa, SCL_ALL, FTAG);
spa_txg_history_set(spa, ts->txg, TXG_STATE_SYNCED, gethrtime());
spa_txg_history_set_io(spa, ts->txg,
ts->vs2.vs_bytes[ZIO_TYPE_READ] - ts->vs1.vs_bytes[ZIO_TYPE_READ],
ts->vs2.vs_bytes[ZIO_TYPE_WRITE] - ts->vs1.vs_bytes[ZIO_TYPE_WRITE],
ts->vs2.vs_ops[ZIO_TYPE_READ] - ts->vs1.vs_ops[ZIO_TYPE_READ],
ts->vs2.vs_ops[ZIO_TYPE_WRITE] - ts->vs1.vs_ops[ZIO_TYPE_WRITE],
ts->ndirty);
kmem_free(ts, sizeof (txg_stat_t));
}
Add visibility in to dmu_tx_assign times This change adds a new kstat to gain some visibility into the amount of time spent in each call to dmu_tx_assign. A histogram is exported via the new dmu_tx_assign file. The information contained in this histogram is the frequency dmu_tx_assign took to complete given an interval range. Signed-off-by: Prakash Surya <surya1@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-10-02 18:43:52 +00:00
/*
* ==========================================================================
* SPA TX Assign Histogram Routines
* ==========================================================================
*/
/*
* Tx statistics - Information exported regarding dmu_tx_assign time.
*/
/*
* When the kstat is written zero all buckets. When the kstat is read
* count the number of trailing buckets set to zero and update ks_ndata
* such that they are not output.
*/
static int
spa_tx_assign_update(kstat_t *ksp, int rw)
{
spa_t *spa = ksp->ks_private;
spa_stats_history_t *ssh = &spa->spa_stats.tx_assign_histogram;
int i;
if (rw == KSTAT_WRITE) {
for (i = 0; i < ssh->count; i++)
((kstat_named_t *)ssh->private)[i].value.ui64 = 0;
}
for (i = ssh->count; i > 0; i--)
if (((kstat_named_t *)ssh->private)[i-1].value.ui64 != 0)
break;
ksp->ks_ndata = i;
cstyle: Resolve C style issues The vast majority of these changes are in Linux specific code. They are the result of not having an automated style checker to validate the code when it was originally written. Others were caused when the common code was slightly adjusted for Linux. This patch contains no functional changes. It only refreshes the code to conform to style guide. Everyone submitting patches for inclusion upstream should now run 'make checkstyle' and resolve any warning prior to opening a pull request. The automated builders have been updated to fail a build if when 'make checkstyle' detects an issue. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1821
2013-11-01 19:26:11 +00:00
ksp->ks_data_size = i * sizeof (kstat_named_t);
Add visibility in to dmu_tx_assign times This change adds a new kstat to gain some visibility into the amount of time spent in each call to dmu_tx_assign. A histogram is exported via the new dmu_tx_assign file. The information contained in this histogram is the frequency dmu_tx_assign took to complete given an interval range. Signed-off-by: Prakash Surya <surya1@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-10-02 18:43:52 +00:00
return (0);
}
static void
spa_tx_assign_init(spa_t *spa)
{
spa_stats_history_t *ssh = &spa->spa_stats.tx_assign_histogram;
Allow longer SPA names in stats The pool name can be 256 chars long. Today, in /proc/spl/kstat/zfs/ the name is limited to < 32 characters. This change is to allows bigger pool names. Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: loli10K <ezomori.nozomu@gmail.com> Reviewed-by: George Melikov <mail@gmelikov.ru> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: gaurkuma <gauravk.18@gmail.com> Closes #6481
2017-08-11 15:56:24 +00:00
char *name;
Add visibility in to dmu_tx_assign times This change adds a new kstat to gain some visibility into the amount of time spent in each call to dmu_tx_assign. A histogram is exported via the new dmu_tx_assign file. The information contained in this histogram is the frequency dmu_tx_assign took to complete given an interval range. Signed-off-by: Prakash Surya <surya1@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-10-02 18:43:52 +00:00
kstat_named_t *ks;
kstat_t *ksp;
int i;
mutex_init(&ssh->lock, NULL, MUTEX_DEFAULT, NULL);
ssh->count = 42; /* power of two buckets for 1ns to 2,199s */
cstyle: Resolve C style issues The vast majority of these changes are in Linux specific code. They are the result of not having an automated style checker to validate the code when it was originally written. Others were caused when the common code was slightly adjusted for Linux. This patch contains no functional changes. It only refreshes the code to conform to style guide. Everyone submitting patches for inclusion upstream should now run 'make checkstyle' and resolve any warning prior to opening a pull request. The automated builders have been updated to fail a build if when 'make checkstyle' detects an issue. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1821
2013-11-01 19:26:11 +00:00
ssh->size = ssh->count * sizeof (kstat_named_t);
Add visibility in to dmu_tx_assign times This change adds a new kstat to gain some visibility into the amount of time spent in each call to dmu_tx_assign. A histogram is exported via the new dmu_tx_assign file. The information contained in this histogram is the frequency dmu_tx_assign took to complete given an interval range. Signed-off-by: Prakash Surya <surya1@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-10-02 18:43:52 +00:00
ssh->private = kmem_alloc(ssh->size, KM_SLEEP);
Allow longer SPA names in stats The pool name can be 256 chars long. Today, in /proc/spl/kstat/zfs/ the name is limited to < 32 characters. This change is to allows bigger pool names. Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: loli10K <ezomori.nozomu@gmail.com> Reviewed-by: George Melikov <mail@gmelikov.ru> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: gaurkuma <gauravk.18@gmail.com> Closes #6481
2017-08-11 15:56:24 +00:00
name = kmem_asprintf("zfs/%s", spa_name(spa));
Add visibility in to dmu_tx_assign times This change adds a new kstat to gain some visibility into the amount of time spent in each call to dmu_tx_assign. A histogram is exported via the new dmu_tx_assign file. The information contained in this histogram is the frequency dmu_tx_assign took to complete given an interval range. Signed-off-by: Prakash Surya <surya1@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-10-02 18:43:52 +00:00
for (i = 0; i < ssh->count; i++) {
ks = &((kstat_named_t *)ssh->private)[i];
ks->data_type = KSTAT_DATA_UINT64;
ks->value.ui64 = 0;
(void) snprintf(ks->name, KSTAT_STRLEN, "%llu ns",
(u_longlong_t)1 << i);
}
ksp = kstat_create(name, 0, "dmu_tx_assign", "misc",
KSTAT_TYPE_NAMED, 0, KSTAT_FLAG_VIRTUAL);
ssh->kstat = ksp;
if (ksp) {
ksp->ks_lock = &ssh->lock;
ksp->ks_data = ssh->private;
ksp->ks_ndata = ssh->count;
ksp->ks_data_size = ssh->size;
ksp->ks_private = spa;
ksp->ks_update = spa_tx_assign_update;
kstat_install(ksp);
}
Allow longer SPA names in stats The pool name can be 256 chars long. Today, in /proc/spl/kstat/zfs/ the name is limited to < 32 characters. This change is to allows bigger pool names. Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: loli10K <ezomori.nozomu@gmail.com> Reviewed-by: George Melikov <mail@gmelikov.ru> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: gaurkuma <gauravk.18@gmail.com> Closes #6481
2017-08-11 15:56:24 +00:00
strfree(name);
Add visibility in to dmu_tx_assign times This change adds a new kstat to gain some visibility into the amount of time spent in each call to dmu_tx_assign. A histogram is exported via the new dmu_tx_assign file. The information contained in this histogram is the frequency dmu_tx_assign took to complete given an interval range. Signed-off-by: Prakash Surya <surya1@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-10-02 18:43:52 +00:00
}
static void
spa_tx_assign_destroy(spa_t *spa)
{
spa_stats_history_t *ssh = &spa->spa_stats.tx_assign_histogram;
kstat_t *ksp;
ksp = ssh->kstat;
if (ksp)
kstat_delete(ksp);
kmem_free(ssh->private, ssh->size);
mutex_destroy(&ssh->lock);
}
void
spa_tx_assign_add_nsecs(spa_t *spa, uint64_t nsecs)
{
spa_stats_history_t *ssh = &spa->spa_stats.tx_assign_histogram;
uint64_t idx = 0;
Explicit integer promotion for bit shift operations Explicitly promote variables to correct type. Undefined behavior is reported because length of int is not well defined by C standard. Issue #4883 Signed-off-by: Gvozden Neskovic <neskovic@gmail.com>
2016-09-02 13:07:00 +00:00
while (((1ULL << idx) < nsecs) && (idx < ssh->size - 1))
Add visibility in to dmu_tx_assign times This change adds a new kstat to gain some visibility into the amount of time spent in each call to dmu_tx_assign. A histogram is exported via the new dmu_tx_assign file. The information contained in this histogram is the frequency dmu_tx_assign took to complete given an interval range. Signed-off-by: Prakash Surya <surya1@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-10-02 18:43:52 +00:00
idx++;
atomic_inc_64(&((kstat_named_t *)ssh->private)[idx].value.ui64);
}
Illumos #3537 3537 want pool io kstats Reviewed by: George Wilson <george.wilson@delphix.com> Reviewed by: Adam Leventhal <ahl@delphix.com> Reviewed by: Eric Schrock <eric.schrock@delphix.com> Reviewed by: Sa?o Kiselkov <skiselkov.ml@gmail.com> Reviewed by: Garrett D'Amore <garrett@damore.org> Reviewed by: Brendan Gregg <brendan.gregg@joyent.com> Approved by: Gordon Ross <gwr@nexenta.com> References: http://www.illumos.org/issues/3537 illumos/illumos-gate@c3a6601 Ported by: Cyril Plisko <cyril.plisko@mountall.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Porting Notes: 1. The patch was restructured to take advantage of the existing spa statistics infrastructure. To accomplish this the kstat was moved in to spa->io_stats and the init/destroy code moved to spa_stats.c. 2. The I/O kstat was simply named <pool> which conflicted with the pool directory we had already created. Therefore it was renamed to <pool>/io 3. An update handler was added to allow the kstat to be zeroed.
2013-08-27 00:09:29 +00:00
/*
* ==========================================================================
* SPA IO History Routines
* ==========================================================================
*/
static int
spa_io_history_update(kstat_t *ksp, int rw)
{
if (rw == KSTAT_WRITE)
memset(ksp->ks_data, 0, ksp->ks_data_size);
return (0);
}
static void
spa_io_history_init(spa_t *spa)
{
spa_stats_history_t *ssh = &spa->spa_stats.io_history;
Allow longer SPA names in stats The pool name can be 256 chars long. Today, in /proc/spl/kstat/zfs/ the name is limited to < 32 characters. This change is to allows bigger pool names. Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: loli10K <ezomori.nozomu@gmail.com> Reviewed-by: George Melikov <mail@gmelikov.ru> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: gaurkuma <gauravk.18@gmail.com> Closes #6481
2017-08-11 15:56:24 +00:00
char *name;
Illumos #3537 3537 want pool io kstats Reviewed by: George Wilson <george.wilson@delphix.com> Reviewed by: Adam Leventhal <ahl@delphix.com> Reviewed by: Eric Schrock <eric.schrock@delphix.com> Reviewed by: Sa?o Kiselkov <skiselkov.ml@gmail.com> Reviewed by: Garrett D'Amore <garrett@damore.org> Reviewed by: Brendan Gregg <brendan.gregg@joyent.com> Approved by: Gordon Ross <gwr@nexenta.com> References: http://www.illumos.org/issues/3537 illumos/illumos-gate@c3a6601 Ported by: Cyril Plisko <cyril.plisko@mountall.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Porting Notes: 1. The patch was restructured to take advantage of the existing spa statistics infrastructure. To accomplish this the kstat was moved in to spa->io_stats and the init/destroy code moved to spa_stats.c. 2. The I/O kstat was simply named <pool> which conflicted with the pool directory we had already created. Therefore it was renamed to <pool>/io 3. An update handler was added to allow the kstat to be zeroed.
2013-08-27 00:09:29 +00:00
kstat_t *ksp;
mutex_init(&ssh->lock, NULL, MUTEX_DEFAULT, NULL);
Allow longer SPA names in stats The pool name can be 256 chars long. Today, in /proc/spl/kstat/zfs/ the name is limited to < 32 characters. This change is to allows bigger pool names. Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: loli10K <ezomori.nozomu@gmail.com> Reviewed-by: George Melikov <mail@gmelikov.ru> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: gaurkuma <gauravk.18@gmail.com> Closes #6481
2017-08-11 15:56:24 +00:00
name = kmem_asprintf("zfs/%s", spa_name(spa));
Illumos #3537 3537 want pool io kstats Reviewed by: George Wilson <george.wilson@delphix.com> Reviewed by: Adam Leventhal <ahl@delphix.com> Reviewed by: Eric Schrock <eric.schrock@delphix.com> Reviewed by: Sa?o Kiselkov <skiselkov.ml@gmail.com> Reviewed by: Garrett D'Amore <garrett@damore.org> Reviewed by: Brendan Gregg <brendan.gregg@joyent.com> Approved by: Gordon Ross <gwr@nexenta.com> References: http://www.illumos.org/issues/3537 illumos/illumos-gate@c3a6601 Ported by: Cyril Plisko <cyril.plisko@mountall.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Porting Notes: 1. The patch was restructured to take advantage of the existing spa statistics infrastructure. To accomplish this the kstat was moved in to spa->io_stats and the init/destroy code moved to spa_stats.c. 2. The I/O kstat was simply named <pool> which conflicted with the pool directory we had already created. Therefore it was renamed to <pool>/io 3. An update handler was added to allow the kstat to be zeroed.
2013-08-27 00:09:29 +00:00
ksp = kstat_create(name, 0, "io", "disk", KSTAT_TYPE_IO, 1, 0);
ssh->kstat = ksp;
if (ksp) {
ksp->ks_lock = &ssh->lock;
ksp->ks_private = spa;
ksp->ks_update = spa_io_history_update;
kstat_install(ksp);
}
Allow longer SPA names in stats The pool name can be 256 chars long. Today, in /proc/spl/kstat/zfs/ the name is limited to < 32 characters. This change is to allows bigger pool names. Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: loli10K <ezomori.nozomu@gmail.com> Reviewed-by: George Melikov <mail@gmelikov.ru> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: gaurkuma <gauravk.18@gmail.com> Closes #6481
2017-08-11 15:56:24 +00:00
strfree(name);
Illumos #3537 3537 want pool io kstats Reviewed by: George Wilson <george.wilson@delphix.com> Reviewed by: Adam Leventhal <ahl@delphix.com> Reviewed by: Eric Schrock <eric.schrock@delphix.com> Reviewed by: Sa?o Kiselkov <skiselkov.ml@gmail.com> Reviewed by: Garrett D'Amore <garrett@damore.org> Reviewed by: Brendan Gregg <brendan.gregg@joyent.com> Approved by: Gordon Ross <gwr@nexenta.com> References: http://www.illumos.org/issues/3537 illumos/illumos-gate@c3a6601 Ported by: Cyril Plisko <cyril.plisko@mountall.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Porting Notes: 1. The patch was restructured to take advantage of the existing spa statistics infrastructure. To accomplish this the kstat was moved in to spa->io_stats and the init/destroy code moved to spa_stats.c. 2. The I/O kstat was simply named <pool> which conflicted with the pool directory we had already created. Therefore it was renamed to <pool>/io 3. An update handler was added to allow the kstat to be zeroed.
2013-08-27 00:09:29 +00:00
}
static void
spa_io_history_destroy(spa_t *spa)
{
spa_stats_history_t *ssh = &spa->spa_stats.io_history;
if (ssh->kstat)
kstat_delete(ssh->kstat);
mutex_destroy(&ssh->lock);
}
Multi-modifier protection (MMP) Add multihost=on|off pool property to control MMP. When enabled a new thread writes uberblocks to the last slot in each label, at a set frequency, to indicate to other hosts the pool is actively imported. These uberblocks are the last synced uberblock with an updated timestamp. Property defaults to off. During tryimport, find the "best" uberblock (newest txg and timestamp) repeatedly, checking for change in the found uberblock. Include the results of the activity test in the config returned by tryimport. These results are reported to user in "zpool import". Allow the user to control the period between MMP writes, and the duration of the activity test on import, via a new module parameter zfs_multihost_interval. The period is specified in milliseconds. The activity test duration is calculated from this value, and from the mmp_delay in the "best" uberblock found initially. Add a kstat interface to export statistics about Multiple Modifier Protection (MMP) updates. Include the last synced txg number, the timestamp, the delay since the last MMP update, the VDEV GUID, the VDEV label that received the last MMP update, and the VDEV path. Abbreviated output below. $ cat /proc/spl/kstat/zfs/mypool/multihost 31 0 0x01 10 880 105092382393521 105144180101111 txg timestamp mmp_delay vdev_guid vdev_label vdev_path 20468 261337 250274925 68396651780 3 /dev/sda 20468 261339 252023374 6267402363293 1 /dev/sdc 20468 261340 252000858 6698080955233 1 /dev/sdx 20468 261341 251980635 783892869810 2 /dev/sdy 20468 261342 253385953 8923255792467 3 /dev/sdd 20468 261344 253336622 042125143176 0 /dev/sdab 20468 261345 253310522 1200778101278 2 /dev/sde 20468 261346 253286429 0950576198362 2 /dev/sdt 20468 261347 253261545 96209817917 3 /dev/sds 20468 261349 253238188 8555725937673 3 /dev/sdb Add a new tunable zfs_multihost_history to specify the number of MMP updates to store history for. By default it is set to zero meaning that no MMP statistics are stored. When using ztest to generate activity, for automated tests of the MMP function, some test functions interfere with the test. For example, the pool is exported to run zdb and then imported again. Add a new ztest function, "-M", to alter ztest behavior to prevent this. Add new tests to verify the new functionality. Tests provided by Giuseppe Di Natale. Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Ned Bass <bass6@llnl.gov> Reviewed-by: Andreas Dilger <andreas.dilger@intel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #745 Closes #6279
2017-07-08 03:20:35 +00:00
/*
* ==========================================================================
* SPA MMP History Routines
* ==========================================================================
*/
/*
* MMP statistics - Information exported regarding each MMP update
*/
typedef struct spa_mmp_history {
uint64_t txg; /* txg of last sync */
uint64_t timestamp; /* UTC time of of last sync */
uint64_t mmp_delay; /* nanosec since last MMP write */
uint64_t vdev_guid; /* unique ID of leaf vdev */
char *vdev_path;
uint64_t vdev_label; /* vdev label */
list_node_t smh_link;
} spa_mmp_history_t;
static int
spa_mmp_history_headers(char *buf, size_t size)
{
(void) snprintf(buf, size, "%-10s %-10s %-12s %-24s %-10s %s\n",
"txg", "timestamp", "mmp_delay", "vdev_guid", "vdev_label",
"vdev_path");
return (0);
}
static int
spa_mmp_history_data(char *buf, size_t size, void *data)
{
spa_mmp_history_t *smh = (spa_mmp_history_t *)data;
(void) snprintf(buf, size, "%-10llu %-10llu %-12llu %-24llu %-10llu "
"%s\n",
(u_longlong_t)smh->txg, (u_longlong_t)smh->timestamp,
(u_longlong_t)smh->mmp_delay, (u_longlong_t)smh->vdev_guid,
(u_longlong_t)smh->vdev_label,
(smh->vdev_path ? smh->vdev_path : "-"));
return (0);
}
/*
* Calculate the address for the next spa_stats_history_t entry. The
* ssh->lock will be held until ksp->ks_ndata entries are processed.
*/
static void *
spa_mmp_history_addr(kstat_t *ksp, loff_t n)
{
spa_t *spa = ksp->ks_private;
spa_stats_history_t *ssh = &spa->spa_stats.mmp_history;
ASSERT(MUTEX_HELD(&ssh->lock));
if (n == 0)
ssh->private = list_tail(&ssh->list);
else if (ssh->private)
ssh->private = list_prev(&ssh->list, ssh->private);
return (ssh->private);
}
/*
* When the kstat is written discard all spa_mmp_history_t entries. The
* ssh->lock will be held until ksp->ks_ndata entries are processed.
*/
static int
spa_mmp_history_update(kstat_t *ksp, int rw)
{
spa_t *spa = ksp->ks_private;
spa_stats_history_t *ssh = &spa->spa_stats.mmp_history;
ASSERT(MUTEX_HELD(&ssh->lock));
if (rw == KSTAT_WRITE) {
spa_mmp_history_t *smh;
while ((smh = list_remove_head(&ssh->list))) {
ssh->size--;
if (smh->vdev_path)
strfree(smh->vdev_path);
kmem_free(smh, sizeof (spa_mmp_history_t));
}
ASSERT3U(ssh->size, ==, 0);
}
ksp->ks_ndata = ssh->size;
ksp->ks_data_size = ssh->size * sizeof (spa_mmp_history_t);
return (0);
}
static void
spa_mmp_history_init(spa_t *spa)
{
spa_stats_history_t *ssh = &spa->spa_stats.mmp_history;
Allow longer SPA names in stats The pool name can be 256 chars long. Today, in /proc/spl/kstat/zfs/ the name is limited to < 32 characters. This change is to allows bigger pool names. Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: loli10K <ezomori.nozomu@gmail.com> Reviewed-by: George Melikov <mail@gmelikov.ru> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: gaurkuma <gauravk.18@gmail.com> Closes #6481
2017-08-11 15:56:24 +00:00
char *name;
Multi-modifier protection (MMP) Add multihost=on|off pool property to control MMP. When enabled a new thread writes uberblocks to the last slot in each label, at a set frequency, to indicate to other hosts the pool is actively imported. These uberblocks are the last synced uberblock with an updated timestamp. Property defaults to off. During tryimport, find the "best" uberblock (newest txg and timestamp) repeatedly, checking for change in the found uberblock. Include the results of the activity test in the config returned by tryimport. These results are reported to user in "zpool import". Allow the user to control the period between MMP writes, and the duration of the activity test on import, via a new module parameter zfs_multihost_interval. The period is specified in milliseconds. The activity test duration is calculated from this value, and from the mmp_delay in the "best" uberblock found initially. Add a kstat interface to export statistics about Multiple Modifier Protection (MMP) updates. Include the last synced txg number, the timestamp, the delay since the last MMP update, the VDEV GUID, the VDEV label that received the last MMP update, and the VDEV path. Abbreviated output below. $ cat /proc/spl/kstat/zfs/mypool/multihost 31 0 0x01 10 880 105092382393521 105144180101111 txg timestamp mmp_delay vdev_guid vdev_label vdev_path 20468 261337 250274925 68396651780 3 /dev/sda 20468 261339 252023374 6267402363293 1 /dev/sdc 20468 261340 252000858 6698080955233 1 /dev/sdx 20468 261341 251980635 783892869810 2 /dev/sdy 20468 261342 253385953 8923255792467 3 /dev/sdd 20468 261344 253336622 042125143176 0 /dev/sdab 20468 261345 253310522 1200778101278 2 /dev/sde 20468 261346 253286429 0950576198362 2 /dev/sdt 20468 261347 253261545 96209817917 3 /dev/sds 20468 261349 253238188 8555725937673 3 /dev/sdb Add a new tunable zfs_multihost_history to specify the number of MMP updates to store history for. By default it is set to zero meaning that no MMP statistics are stored. When using ztest to generate activity, for automated tests of the MMP function, some test functions interfere with the test. For example, the pool is exported to run zdb and then imported again. Add a new ztest function, "-M", to alter ztest behavior to prevent this. Add new tests to verify the new functionality. Tests provided by Giuseppe Di Natale. Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Ned Bass <bass6@llnl.gov> Reviewed-by: Andreas Dilger <andreas.dilger@intel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #745 Closes #6279
2017-07-08 03:20:35 +00:00
kstat_t *ksp;
mutex_init(&ssh->lock, NULL, MUTEX_DEFAULT, NULL);
list_create(&ssh->list, sizeof (spa_mmp_history_t),
offsetof(spa_mmp_history_t, smh_link));
ssh->count = 0;
ssh->size = 0;
ssh->private = NULL;
Allow longer SPA names in stats The pool name can be 256 chars long. Today, in /proc/spl/kstat/zfs/ the name is limited to < 32 characters. This change is to allows bigger pool names. Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: loli10K <ezomori.nozomu@gmail.com> Reviewed-by: George Melikov <mail@gmelikov.ru> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: gaurkuma <gauravk.18@gmail.com> Closes #6481
2017-08-11 15:56:24 +00:00
name = kmem_asprintf("zfs/%s", spa_name(spa));
Multi-modifier protection (MMP) Add multihost=on|off pool property to control MMP. When enabled a new thread writes uberblocks to the last slot in each label, at a set frequency, to indicate to other hosts the pool is actively imported. These uberblocks are the last synced uberblock with an updated timestamp. Property defaults to off. During tryimport, find the "best" uberblock (newest txg and timestamp) repeatedly, checking for change in the found uberblock. Include the results of the activity test in the config returned by tryimport. These results are reported to user in "zpool import". Allow the user to control the period between MMP writes, and the duration of the activity test on import, via a new module parameter zfs_multihost_interval. The period is specified in milliseconds. The activity test duration is calculated from this value, and from the mmp_delay in the "best" uberblock found initially. Add a kstat interface to export statistics about Multiple Modifier Protection (MMP) updates. Include the last synced txg number, the timestamp, the delay since the last MMP update, the VDEV GUID, the VDEV label that received the last MMP update, and the VDEV path. Abbreviated output below. $ cat /proc/spl/kstat/zfs/mypool/multihost 31 0 0x01 10 880 105092382393521 105144180101111 txg timestamp mmp_delay vdev_guid vdev_label vdev_path 20468 261337 250274925 68396651780 3 /dev/sda 20468 261339 252023374 6267402363293 1 /dev/sdc 20468 261340 252000858 6698080955233 1 /dev/sdx 20468 261341 251980635 783892869810 2 /dev/sdy 20468 261342 253385953 8923255792467 3 /dev/sdd 20468 261344 253336622 042125143176 0 /dev/sdab 20468 261345 253310522 1200778101278 2 /dev/sde 20468 261346 253286429 0950576198362 2 /dev/sdt 20468 261347 253261545 96209817917 3 /dev/sds 20468 261349 253238188 8555725937673 3 /dev/sdb Add a new tunable zfs_multihost_history to specify the number of MMP updates to store history for. By default it is set to zero meaning that no MMP statistics are stored. When using ztest to generate activity, for automated tests of the MMP function, some test functions interfere with the test. For example, the pool is exported to run zdb and then imported again. Add a new ztest function, "-M", to alter ztest behavior to prevent this. Add new tests to verify the new functionality. Tests provided by Giuseppe Di Natale. Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Ned Bass <bass6@llnl.gov> Reviewed-by: Andreas Dilger <andreas.dilger@intel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #745 Closes #6279
2017-07-08 03:20:35 +00:00
ksp = kstat_create(name, 0, "multihost", "misc",
KSTAT_TYPE_RAW, 0, KSTAT_FLAG_VIRTUAL);
ssh->kstat = ksp;
if (ksp) {
ksp->ks_lock = &ssh->lock;
ksp->ks_data = NULL;
ksp->ks_private = spa;
ksp->ks_update = spa_mmp_history_update;
kstat_set_raw_ops(ksp, spa_mmp_history_headers,
spa_mmp_history_data, spa_mmp_history_addr);
kstat_install(ksp);
}
Allow longer SPA names in stats The pool name can be 256 chars long. Today, in /proc/spl/kstat/zfs/ the name is limited to < 32 characters. This change is to allows bigger pool names. Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: loli10K <ezomori.nozomu@gmail.com> Reviewed-by: George Melikov <mail@gmelikov.ru> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: gaurkuma <gauravk.18@gmail.com> Closes #6481
2017-08-11 15:56:24 +00:00
strfree(name);
Multi-modifier protection (MMP) Add multihost=on|off pool property to control MMP. When enabled a new thread writes uberblocks to the last slot in each label, at a set frequency, to indicate to other hosts the pool is actively imported. These uberblocks are the last synced uberblock with an updated timestamp. Property defaults to off. During tryimport, find the "best" uberblock (newest txg and timestamp) repeatedly, checking for change in the found uberblock. Include the results of the activity test in the config returned by tryimport. These results are reported to user in "zpool import". Allow the user to control the period between MMP writes, and the duration of the activity test on import, via a new module parameter zfs_multihost_interval. The period is specified in milliseconds. The activity test duration is calculated from this value, and from the mmp_delay in the "best" uberblock found initially. Add a kstat interface to export statistics about Multiple Modifier Protection (MMP) updates. Include the last synced txg number, the timestamp, the delay since the last MMP update, the VDEV GUID, the VDEV label that received the last MMP update, and the VDEV path. Abbreviated output below. $ cat /proc/spl/kstat/zfs/mypool/multihost 31 0 0x01 10 880 105092382393521 105144180101111 txg timestamp mmp_delay vdev_guid vdev_label vdev_path 20468 261337 250274925 68396651780 3 /dev/sda 20468 261339 252023374 6267402363293 1 /dev/sdc 20468 261340 252000858 6698080955233 1 /dev/sdx 20468 261341 251980635 783892869810 2 /dev/sdy 20468 261342 253385953 8923255792467 3 /dev/sdd 20468 261344 253336622 042125143176 0 /dev/sdab 20468 261345 253310522 1200778101278 2 /dev/sde 20468 261346 253286429 0950576198362 2 /dev/sdt 20468 261347 253261545 96209817917 3 /dev/sds 20468 261349 253238188 8555725937673 3 /dev/sdb Add a new tunable zfs_multihost_history to specify the number of MMP updates to store history for. By default it is set to zero meaning that no MMP statistics are stored. When using ztest to generate activity, for automated tests of the MMP function, some test functions interfere with the test. For example, the pool is exported to run zdb and then imported again. Add a new ztest function, "-M", to alter ztest behavior to prevent this. Add new tests to verify the new functionality. Tests provided by Giuseppe Di Natale. Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Ned Bass <bass6@llnl.gov> Reviewed-by: Andreas Dilger <andreas.dilger@intel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #745 Closes #6279
2017-07-08 03:20:35 +00:00
}
static void
spa_mmp_history_destroy(spa_t *spa)
{
spa_stats_history_t *ssh = &spa->spa_stats.mmp_history;
spa_mmp_history_t *smh;
kstat_t *ksp;
ksp = ssh->kstat;
if (ksp)
kstat_delete(ksp);
mutex_enter(&ssh->lock);
while ((smh = list_remove_head(&ssh->list))) {
ssh->size--;
if (smh->vdev_path)
strfree(smh->vdev_path);
kmem_free(smh, sizeof (spa_mmp_history_t));
}
ASSERT3U(ssh->size, ==, 0);
list_destroy(&ssh->list);
mutex_exit(&ssh->lock);
mutex_destroy(&ssh->lock);
}
/*
* Add a new MMP update to historical record.
*/
void
spa_mmp_history_add(uint64_t txg, uint64_t timestamp, uint64_t mmp_delay,
vdev_t *vd, int label)
{
spa_t *spa = vd->vdev_spa;
spa_stats_history_t *ssh = &spa->spa_stats.mmp_history;
spa_mmp_history_t *smh, *rm;
if (zfs_multihost_history == 0 && ssh->size == 0)
return;
smh = kmem_zalloc(sizeof (spa_mmp_history_t), KM_SLEEP);
smh->txg = txg;
smh->timestamp = timestamp;
smh->mmp_delay = mmp_delay;
smh->vdev_guid = vd->vdev_guid;
if (vd->vdev_path)
smh->vdev_path = strdup(vd->vdev_path);
smh->vdev_label = label;
mutex_enter(&ssh->lock);
list_insert_head(&ssh->list, smh);
ssh->size++;
while (ssh->size > zfs_multihost_history) {
ssh->size--;
rm = list_remove_tail(&ssh->list);
if (rm->vdev_path)
strfree(rm->vdev_path);
kmem_free(rm, sizeof (spa_mmp_history_t));
}
mutex_exit(&ssh->lock);
}
Add visibility in to arc_read This change is an attempt to add visibility into the arc_read calls occurring on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to a call to arc_read. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each arc_read call, the following information is exported: * A unique identifier (uint64_t) * The time the entry was added to the list (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The objset ID (uint64_t) * The object number (uint64_t) * The indirection level (uint64_t) * The block ID (uint64_t) * The name of the function originating the arc_read call (char[24]) * The arc_flags from the arc_read call (uint32_t) * The PID of the reading thread (pid_t) * The command or name of thread originating read (char[16]) From this exported information one can see, in real time, exactly what is being read, what function is generating the read, and whether or not the read was found to be already cached. There is still some work to be done, but this should serve as a good starting point. Specifically, dbuf_read's are not accounted for in the currently exported information. Thus, a follow up patch should probably be added to export these calls that never call into arc_read (they only hit the dbuf hash table). In addition, it might be nice to create a utility similar to "arcstat.py" to digest the exported information and display it in a more readable format. Or perhaps, log the information and allow for it to be "replayed" at a later time. Signed-off-by: Prakash Surya <surya1@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-09-06 23:09:05 +00:00
void
spa_stats_init(spa_t *spa)
{
spa_read_history_init(spa);
Add visibility in to txg sync behavior This change is an attempt to add visibility in to how txgs are being formed on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to txg. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each txg, the following information is exported: * Unique txg number (uint64_t) * The time the txd was born (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The current txg state ((O)pen/(Q)uiescing/(S)yncing/(C)ommitted) * The number of reserved bytes for the txg (uint64_t) * The number of bytes read during the txg (uint64_t) * The number of bytes written during the txg (uint64_t) * The number of read operations during the txg (uint64_t) * The number of write operations during the txg (uint64_t) * The time the txg was closed (hrtime_t) * The time the txg was quiesced (hrtime_t) * The time the txg was synced (hrtime_t) Note that while the raw kstat now stores relative hrtimes for the open, quiesce, and sync times. Those relative times are used to calculate how long each state took and these deltas and printed by output handlers. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-10-01 16:50:50 +00:00
spa_txg_history_init(spa);
Add visibility in to dmu_tx_assign times This change adds a new kstat to gain some visibility into the amount of time spent in each call to dmu_tx_assign. A histogram is exported via the new dmu_tx_assign file. The information contained in this histogram is the frequency dmu_tx_assign took to complete given an interval range. Signed-off-by: Prakash Surya <surya1@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-10-02 18:43:52 +00:00
spa_tx_assign_init(spa);
Illumos #3537 3537 want pool io kstats Reviewed by: George Wilson <george.wilson@delphix.com> Reviewed by: Adam Leventhal <ahl@delphix.com> Reviewed by: Eric Schrock <eric.schrock@delphix.com> Reviewed by: Sa?o Kiselkov <skiselkov.ml@gmail.com> Reviewed by: Garrett D'Amore <garrett@damore.org> Reviewed by: Brendan Gregg <brendan.gregg@joyent.com> Approved by: Gordon Ross <gwr@nexenta.com> References: http://www.illumos.org/issues/3537 illumos/illumos-gate@c3a6601 Ported by: Cyril Plisko <cyril.plisko@mountall.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Porting Notes: 1. The patch was restructured to take advantage of the existing spa statistics infrastructure. To accomplish this the kstat was moved in to spa->io_stats and the init/destroy code moved to spa_stats.c. 2. The I/O kstat was simply named <pool> which conflicted with the pool directory we had already created. Therefore it was renamed to <pool>/io 3. An update handler was added to allow the kstat to be zeroed.
2013-08-27 00:09:29 +00:00
spa_io_history_init(spa);
Multi-modifier protection (MMP) Add multihost=on|off pool property to control MMP. When enabled a new thread writes uberblocks to the last slot in each label, at a set frequency, to indicate to other hosts the pool is actively imported. These uberblocks are the last synced uberblock with an updated timestamp. Property defaults to off. During tryimport, find the "best" uberblock (newest txg and timestamp) repeatedly, checking for change in the found uberblock. Include the results of the activity test in the config returned by tryimport. These results are reported to user in "zpool import". Allow the user to control the period between MMP writes, and the duration of the activity test on import, via a new module parameter zfs_multihost_interval. The period is specified in milliseconds. The activity test duration is calculated from this value, and from the mmp_delay in the "best" uberblock found initially. Add a kstat interface to export statistics about Multiple Modifier Protection (MMP) updates. Include the last synced txg number, the timestamp, the delay since the last MMP update, the VDEV GUID, the VDEV label that received the last MMP update, and the VDEV path. Abbreviated output below. $ cat /proc/spl/kstat/zfs/mypool/multihost 31 0 0x01 10 880 105092382393521 105144180101111 txg timestamp mmp_delay vdev_guid vdev_label vdev_path 20468 261337 250274925 68396651780 3 /dev/sda 20468 261339 252023374 6267402363293 1 /dev/sdc 20468 261340 252000858 6698080955233 1 /dev/sdx 20468 261341 251980635 783892869810 2 /dev/sdy 20468 261342 253385953 8923255792467 3 /dev/sdd 20468 261344 253336622 042125143176 0 /dev/sdab 20468 261345 253310522 1200778101278 2 /dev/sde 20468 261346 253286429 0950576198362 2 /dev/sdt 20468 261347 253261545 96209817917 3 /dev/sds 20468 261349 253238188 8555725937673 3 /dev/sdb Add a new tunable zfs_multihost_history to specify the number of MMP updates to store history for. By default it is set to zero meaning that no MMP statistics are stored. When using ztest to generate activity, for automated tests of the MMP function, some test functions interfere with the test. For example, the pool is exported to run zdb and then imported again. Add a new ztest function, "-M", to alter ztest behavior to prevent this. Add new tests to verify the new functionality. Tests provided by Giuseppe Di Natale. Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Ned Bass <bass6@llnl.gov> Reviewed-by: Andreas Dilger <andreas.dilger@intel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #745 Closes #6279
2017-07-08 03:20:35 +00:00
spa_mmp_history_init(spa);
Add visibility in to arc_read This change is an attempt to add visibility into the arc_read calls occurring on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to a call to arc_read. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each arc_read call, the following information is exported: * A unique identifier (uint64_t) * The time the entry was added to the list (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The objset ID (uint64_t) * The object number (uint64_t) * The indirection level (uint64_t) * The block ID (uint64_t) * The name of the function originating the arc_read call (char[24]) * The arc_flags from the arc_read call (uint32_t) * The PID of the reading thread (pid_t) * The command or name of thread originating read (char[16]) From this exported information one can see, in real time, exactly what is being read, what function is generating the read, and whether or not the read was found to be already cached. There is still some work to be done, but this should serve as a good starting point. Specifically, dbuf_read's are not accounted for in the currently exported information. Thus, a follow up patch should probably be added to export these calls that never call into arc_read (they only hit the dbuf hash table). In addition, it might be nice to create a utility similar to "arcstat.py" to digest the exported information and display it in a more readable format. Or perhaps, log the information and allow for it to be "replayed" at a later time. Signed-off-by: Prakash Surya <surya1@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-09-06 23:09:05 +00:00
}
void
spa_stats_destroy(spa_t *spa)
{
Add visibility in to dmu_tx_assign times This change adds a new kstat to gain some visibility into the amount of time spent in each call to dmu_tx_assign. A histogram is exported via the new dmu_tx_assign file. The information contained in this histogram is the frequency dmu_tx_assign took to complete given an interval range. Signed-off-by: Prakash Surya <surya1@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-10-02 18:43:52 +00:00
spa_tx_assign_destroy(spa);
Add visibility in to txg sync behavior This change is an attempt to add visibility in to how txgs are being formed on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to txg. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each txg, the following information is exported: * Unique txg number (uint64_t) * The time the txd was born (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The current txg state ((O)pen/(Q)uiescing/(S)yncing/(C)ommitted) * The number of reserved bytes for the txg (uint64_t) * The number of bytes read during the txg (uint64_t) * The number of bytes written during the txg (uint64_t) * The number of read operations during the txg (uint64_t) * The number of write operations during the txg (uint64_t) * The time the txg was closed (hrtime_t) * The time the txg was quiesced (hrtime_t) * The time the txg was synced (hrtime_t) Note that while the raw kstat now stores relative hrtimes for the open, quiesce, and sync times. Those relative times are used to calculate how long each state took and these deltas and printed by output handlers. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-10-01 16:50:50 +00:00
spa_txg_history_destroy(spa);
Add visibility in to arc_read This change is an attempt to add visibility into the arc_read calls occurring on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to a call to arc_read. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each arc_read call, the following information is exported: * A unique identifier (uint64_t) * The time the entry was added to the list (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The objset ID (uint64_t) * The object number (uint64_t) * The indirection level (uint64_t) * The block ID (uint64_t) * The name of the function originating the arc_read call (char[24]) * The arc_flags from the arc_read call (uint32_t) * The PID of the reading thread (pid_t) * The command or name of thread originating read (char[16]) From this exported information one can see, in real time, exactly what is being read, what function is generating the read, and whether or not the read was found to be already cached. There is still some work to be done, but this should serve as a good starting point. Specifically, dbuf_read's are not accounted for in the currently exported information. Thus, a follow up patch should probably be added to export these calls that never call into arc_read (they only hit the dbuf hash table). In addition, it might be nice to create a utility similar to "arcstat.py" to digest the exported information and display it in a more readable format. Or perhaps, log the information and allow for it to be "replayed" at a later time. Signed-off-by: Prakash Surya <surya1@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-09-06 23:09:05 +00:00
spa_read_history_destroy(spa);
Illumos #3537 3537 want pool io kstats Reviewed by: George Wilson <george.wilson@delphix.com> Reviewed by: Adam Leventhal <ahl@delphix.com> Reviewed by: Eric Schrock <eric.schrock@delphix.com> Reviewed by: Sa?o Kiselkov <skiselkov.ml@gmail.com> Reviewed by: Garrett D'Amore <garrett@damore.org> Reviewed by: Brendan Gregg <brendan.gregg@joyent.com> Approved by: Gordon Ross <gwr@nexenta.com> References: http://www.illumos.org/issues/3537 illumos/illumos-gate@c3a6601 Ported by: Cyril Plisko <cyril.plisko@mountall.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Porting Notes: 1. The patch was restructured to take advantage of the existing spa statistics infrastructure. To accomplish this the kstat was moved in to spa->io_stats and the init/destroy code moved to spa_stats.c. 2. The I/O kstat was simply named <pool> which conflicted with the pool directory we had already created. Therefore it was renamed to <pool>/io 3. An update handler was added to allow the kstat to be zeroed.
2013-08-27 00:09:29 +00:00
spa_io_history_destroy(spa);
Multi-modifier protection (MMP) Add multihost=on|off pool property to control MMP. When enabled a new thread writes uberblocks to the last slot in each label, at a set frequency, to indicate to other hosts the pool is actively imported. These uberblocks are the last synced uberblock with an updated timestamp. Property defaults to off. During tryimport, find the "best" uberblock (newest txg and timestamp) repeatedly, checking for change in the found uberblock. Include the results of the activity test in the config returned by tryimport. These results are reported to user in "zpool import". Allow the user to control the period between MMP writes, and the duration of the activity test on import, via a new module parameter zfs_multihost_interval. The period is specified in milliseconds. The activity test duration is calculated from this value, and from the mmp_delay in the "best" uberblock found initially. Add a kstat interface to export statistics about Multiple Modifier Protection (MMP) updates. Include the last synced txg number, the timestamp, the delay since the last MMP update, the VDEV GUID, the VDEV label that received the last MMP update, and the VDEV path. Abbreviated output below. $ cat /proc/spl/kstat/zfs/mypool/multihost 31 0 0x01 10 880 105092382393521 105144180101111 txg timestamp mmp_delay vdev_guid vdev_label vdev_path 20468 261337 250274925 68396651780 3 /dev/sda 20468 261339 252023374 6267402363293 1 /dev/sdc 20468 261340 252000858 6698080955233 1 /dev/sdx 20468 261341 251980635 783892869810 2 /dev/sdy 20468 261342 253385953 8923255792467 3 /dev/sdd 20468 261344 253336622 042125143176 0 /dev/sdab 20468 261345 253310522 1200778101278 2 /dev/sde 20468 261346 253286429 0950576198362 2 /dev/sdt 20468 261347 253261545 96209817917 3 /dev/sds 20468 261349 253238188 8555725937673 3 /dev/sdb Add a new tunable zfs_multihost_history to specify the number of MMP updates to store history for. By default it is set to zero meaning that no MMP statistics are stored. When using ztest to generate activity, for automated tests of the MMP function, some test functions interfere with the test. For example, the pool is exported to run zdb and then imported again. Add a new ztest function, "-M", to alter ztest behavior to prevent this. Add new tests to verify the new functionality. Tests provided by Giuseppe Di Natale. Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Ned Bass <bass6@llnl.gov> Reviewed-by: Andreas Dilger <andreas.dilger@intel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #745 Closes #6279
2017-07-08 03:20:35 +00:00
spa_mmp_history_destroy(spa);
Add visibility in to arc_read This change is an attempt to add visibility into the arc_read calls occurring on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to a call to arc_read. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each arc_read call, the following information is exported: * A unique identifier (uint64_t) * The time the entry was added to the list (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The objset ID (uint64_t) * The object number (uint64_t) * The indirection level (uint64_t) * The block ID (uint64_t) * The name of the function originating the arc_read call (char[24]) * The arc_flags from the arc_read call (uint32_t) * The PID of the reading thread (pid_t) * The command or name of thread originating read (char[16]) From this exported information one can see, in real time, exactly what is being read, what function is generating the read, and whether or not the read was found to be already cached. There is still some work to be done, but this should serve as a good starting point. Specifically, dbuf_read's are not accounted for in the currently exported information. Thus, a follow up patch should probably be added to export these calls that never call into arc_read (they only hit the dbuf hash table). In addition, it might be nice to create a utility similar to "arcstat.py" to digest the exported information and display it in a more readable format. Or perhaps, log the information and allow for it to be "replayed" at a later time. Signed-off-by: Prakash Surya <surya1@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-09-06 23:09:05 +00:00
}
#if defined(_KERNEL) && defined(HAVE_SPL)
Multi-modifier protection (MMP) Add multihost=on|off pool property to control MMP. When enabled a new thread writes uberblocks to the last slot in each label, at a set frequency, to indicate to other hosts the pool is actively imported. These uberblocks are the last synced uberblock with an updated timestamp. Property defaults to off. During tryimport, find the "best" uberblock (newest txg and timestamp) repeatedly, checking for change in the found uberblock. Include the results of the activity test in the config returned by tryimport. These results are reported to user in "zpool import". Allow the user to control the period between MMP writes, and the duration of the activity test on import, via a new module parameter zfs_multihost_interval. The period is specified in milliseconds. The activity test duration is calculated from this value, and from the mmp_delay in the "best" uberblock found initially. Add a kstat interface to export statistics about Multiple Modifier Protection (MMP) updates. Include the last synced txg number, the timestamp, the delay since the last MMP update, the VDEV GUID, the VDEV label that received the last MMP update, and the VDEV path. Abbreviated output below. $ cat /proc/spl/kstat/zfs/mypool/multihost 31 0 0x01 10 880 105092382393521 105144180101111 txg timestamp mmp_delay vdev_guid vdev_label vdev_path 20468 261337 250274925 68396651780 3 /dev/sda 20468 261339 252023374 6267402363293 1 /dev/sdc 20468 261340 252000858 6698080955233 1 /dev/sdx 20468 261341 251980635 783892869810 2 /dev/sdy 20468 261342 253385953 8923255792467 3 /dev/sdd 20468 261344 253336622 042125143176 0 /dev/sdab 20468 261345 253310522 1200778101278 2 /dev/sde 20468 261346 253286429 0950576198362 2 /dev/sdt 20468 261347 253261545 96209817917 3 /dev/sds 20468 261349 253238188 8555725937673 3 /dev/sdb Add a new tunable zfs_multihost_history to specify the number of MMP updates to store history for. By default it is set to zero meaning that no MMP statistics are stored. When using ztest to generate activity, for automated tests of the MMP function, some test functions interfere with the test. For example, the pool is exported to run zdb and then imported again. Add a new ztest function, "-M", to alter ztest behavior to prevent this. Add new tests to verify the new functionality. Tests provided by Giuseppe Di Natale. Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Ned Bass <bass6@llnl.gov> Reviewed-by: Andreas Dilger <andreas.dilger@intel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #745 Closes #6279
2017-07-08 03:20:35 +00:00
/* CSTYLED */
Add visibility in to arc_read This change is an attempt to add visibility into the arc_read calls occurring on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to a call to arc_read. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each arc_read call, the following information is exported: * A unique identifier (uint64_t) * The time the entry was added to the list (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The objset ID (uint64_t) * The object number (uint64_t) * The indirection level (uint64_t) * The block ID (uint64_t) * The name of the function originating the arc_read call (char[24]) * The arc_flags from the arc_read call (uint32_t) * The PID of the reading thread (pid_t) * The command or name of thread originating read (char[16]) From this exported information one can see, in real time, exactly what is being read, what function is generating the read, and whether or not the read was found to be already cached. There is still some work to be done, but this should serve as a good starting point. Specifically, dbuf_read's are not accounted for in the currently exported information. Thus, a follow up patch should probably be added to export these calls that never call into arc_read (they only hit the dbuf hash table). In addition, it might be nice to create a utility similar to "arcstat.py" to digest the exported information and display it in a more readable format. Or perhaps, log the information and allow for it to be "replayed" at a later time. Signed-off-by: Prakash Surya <surya1@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-09-06 23:09:05 +00:00
module_param(zfs_read_history, int, 0644);
Multi-modifier protection (MMP) Add multihost=on|off pool property to control MMP. When enabled a new thread writes uberblocks to the last slot in each label, at a set frequency, to indicate to other hosts the pool is actively imported. These uberblocks are the last synced uberblock with an updated timestamp. Property defaults to off. During tryimport, find the "best" uberblock (newest txg and timestamp) repeatedly, checking for change in the found uberblock. Include the results of the activity test in the config returned by tryimport. These results are reported to user in "zpool import". Allow the user to control the period between MMP writes, and the duration of the activity test on import, via a new module parameter zfs_multihost_interval. The period is specified in milliseconds. The activity test duration is calculated from this value, and from the mmp_delay in the "best" uberblock found initially. Add a kstat interface to export statistics about Multiple Modifier Protection (MMP) updates. Include the last synced txg number, the timestamp, the delay since the last MMP update, the VDEV GUID, the VDEV label that received the last MMP update, and the VDEV path. Abbreviated output below. $ cat /proc/spl/kstat/zfs/mypool/multihost 31 0 0x01 10 880 105092382393521 105144180101111 txg timestamp mmp_delay vdev_guid vdev_label vdev_path 20468 261337 250274925 68396651780 3 /dev/sda 20468 261339 252023374 6267402363293 1 /dev/sdc 20468 261340 252000858 6698080955233 1 /dev/sdx 20468 261341 251980635 783892869810 2 /dev/sdy 20468 261342 253385953 8923255792467 3 /dev/sdd 20468 261344 253336622 042125143176 0 /dev/sdab 20468 261345 253310522 1200778101278 2 /dev/sde 20468 261346 253286429 0950576198362 2 /dev/sdt 20468 261347 253261545 96209817917 3 /dev/sds 20468 261349 253238188 8555725937673 3 /dev/sdb Add a new tunable zfs_multihost_history to specify the number of MMP updates to store history for. By default it is set to zero meaning that no MMP statistics are stored. When using ztest to generate activity, for automated tests of the MMP function, some test functions interfere with the test. For example, the pool is exported to run zdb and then imported again. Add a new ztest function, "-M", to alter ztest behavior to prevent this. Add new tests to verify the new functionality. Tests provided by Giuseppe Di Natale. Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Ned Bass <bass6@llnl.gov> Reviewed-by: Andreas Dilger <andreas.dilger@intel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #745 Closes #6279
2017-07-08 03:20:35 +00:00
MODULE_PARM_DESC(zfs_read_history,
"Historical statistics for the last N reads");
Add visibility in to arc_read This change is an attempt to add visibility into the arc_read calls occurring on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to a call to arc_read. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each arc_read call, the following information is exported: * A unique identifier (uint64_t) * The time the entry was added to the list (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The objset ID (uint64_t) * The object number (uint64_t) * The indirection level (uint64_t) * The block ID (uint64_t) * The name of the function originating the arc_read call (char[24]) * The arc_flags from the arc_read call (uint32_t) * The PID of the reading thread (pid_t) * The command or name of thread originating read (char[16]) From this exported information one can see, in real time, exactly what is being read, what function is generating the read, and whether or not the read was found to be already cached. There is still some work to be done, but this should serve as a good starting point. Specifically, dbuf_read's are not accounted for in the currently exported information. Thus, a follow up patch should probably be added to export these calls that never call into arc_read (they only hit the dbuf hash table). In addition, it might be nice to create a utility similar to "arcstat.py" to digest the exported information and display it in a more readable format. Or perhaps, log the information and allow for it to be "replayed" at a later time. Signed-off-by: Prakash Surya <surya1@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-09-06 23:09:05 +00:00
module_param(zfs_read_history_hits, int, 0644);
Multi-modifier protection (MMP) Add multihost=on|off pool property to control MMP. When enabled a new thread writes uberblocks to the last slot in each label, at a set frequency, to indicate to other hosts the pool is actively imported. These uberblocks are the last synced uberblock with an updated timestamp. Property defaults to off. During tryimport, find the "best" uberblock (newest txg and timestamp) repeatedly, checking for change in the found uberblock. Include the results of the activity test in the config returned by tryimport. These results are reported to user in "zpool import". Allow the user to control the period between MMP writes, and the duration of the activity test on import, via a new module parameter zfs_multihost_interval. The period is specified in milliseconds. The activity test duration is calculated from this value, and from the mmp_delay in the "best" uberblock found initially. Add a kstat interface to export statistics about Multiple Modifier Protection (MMP) updates. Include the last synced txg number, the timestamp, the delay since the last MMP update, the VDEV GUID, the VDEV label that received the last MMP update, and the VDEV path. Abbreviated output below. $ cat /proc/spl/kstat/zfs/mypool/multihost 31 0 0x01 10 880 105092382393521 105144180101111 txg timestamp mmp_delay vdev_guid vdev_label vdev_path 20468 261337 250274925 68396651780 3 /dev/sda 20468 261339 252023374 6267402363293 1 /dev/sdc 20468 261340 252000858 6698080955233 1 /dev/sdx 20468 261341 251980635 783892869810 2 /dev/sdy 20468 261342 253385953 8923255792467 3 /dev/sdd 20468 261344 253336622 042125143176 0 /dev/sdab 20468 261345 253310522 1200778101278 2 /dev/sde 20468 261346 253286429 0950576198362 2 /dev/sdt 20468 261347 253261545 96209817917 3 /dev/sds 20468 261349 253238188 8555725937673 3 /dev/sdb Add a new tunable zfs_multihost_history to specify the number of MMP updates to store history for. By default it is set to zero meaning that no MMP statistics are stored. When using ztest to generate activity, for automated tests of the MMP function, some test functions interfere with the test. For example, the pool is exported to run zdb and then imported again. Add a new ztest function, "-M", to alter ztest behavior to prevent this. Add new tests to verify the new functionality. Tests provided by Giuseppe Di Natale. Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Ned Bass <bass6@llnl.gov> Reviewed-by: Andreas Dilger <andreas.dilger@intel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #745 Closes #6279
2017-07-08 03:20:35 +00:00
MODULE_PARM_DESC(zfs_read_history_hits,
"Include cache hits in read history");
Add visibility in to txg sync behavior This change is an attempt to add visibility in to how txgs are being formed on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to txg. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each txg, the following information is exported: * Unique txg number (uint64_t) * The time the txd was born (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The current txg state ((O)pen/(Q)uiescing/(S)yncing/(C)ommitted) * The number of reserved bytes for the txg (uint64_t) * The number of bytes read during the txg (uint64_t) * The number of bytes written during the txg (uint64_t) * The number of read operations during the txg (uint64_t) * The number of write operations during the txg (uint64_t) * The time the txg was closed (hrtime_t) * The time the txg was quiesced (hrtime_t) * The time the txg was synced (hrtime_t) Note that while the raw kstat now stores relative hrtimes for the open, quiesce, and sync times. Those relative times are used to calculate how long each state took and these deltas and printed by output handlers. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-10-01 16:50:50 +00:00
module_param(zfs_txg_history, int, 0644);
Multi-modifier protection (MMP) Add multihost=on|off pool property to control MMP. When enabled a new thread writes uberblocks to the last slot in each label, at a set frequency, to indicate to other hosts the pool is actively imported. These uberblocks are the last synced uberblock with an updated timestamp. Property defaults to off. During tryimport, find the "best" uberblock (newest txg and timestamp) repeatedly, checking for change in the found uberblock. Include the results of the activity test in the config returned by tryimport. These results are reported to user in "zpool import". Allow the user to control the period between MMP writes, and the duration of the activity test on import, via a new module parameter zfs_multihost_interval. The period is specified in milliseconds. The activity test duration is calculated from this value, and from the mmp_delay in the "best" uberblock found initially. Add a kstat interface to export statistics about Multiple Modifier Protection (MMP) updates. Include the last synced txg number, the timestamp, the delay since the last MMP update, the VDEV GUID, the VDEV label that received the last MMP update, and the VDEV path. Abbreviated output below. $ cat /proc/spl/kstat/zfs/mypool/multihost 31 0 0x01 10 880 105092382393521 105144180101111 txg timestamp mmp_delay vdev_guid vdev_label vdev_path 20468 261337 250274925 68396651780 3 /dev/sda 20468 261339 252023374 6267402363293 1 /dev/sdc 20468 261340 252000858 6698080955233 1 /dev/sdx 20468 261341 251980635 783892869810 2 /dev/sdy 20468 261342 253385953 8923255792467 3 /dev/sdd 20468 261344 253336622 042125143176 0 /dev/sdab 20468 261345 253310522 1200778101278 2 /dev/sde 20468 261346 253286429 0950576198362 2 /dev/sdt 20468 261347 253261545 96209817917 3 /dev/sds 20468 261349 253238188 8555725937673 3 /dev/sdb Add a new tunable zfs_multihost_history to specify the number of MMP updates to store history for. By default it is set to zero meaning that no MMP statistics are stored. When using ztest to generate activity, for automated tests of the MMP function, some test functions interfere with the test. For example, the pool is exported to run zdb and then imported again. Add a new ztest function, "-M", to alter ztest behavior to prevent this. Add new tests to verify the new functionality. Tests provided by Giuseppe Di Natale. Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Ned Bass <bass6@llnl.gov> Reviewed-by: Andreas Dilger <andreas.dilger@intel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #745 Closes #6279
2017-07-08 03:20:35 +00:00
MODULE_PARM_DESC(zfs_txg_history,
"Historical statistics for the last N txgs");
module_param(zfs_multihost_history, int, 0644);
MODULE_PARM_DESC(zfs_multihost_history,
"Historical statistics for last N multihost writes");
/* END CSTYLED */
Add visibility in to arc_read This change is an attempt to add visibility into the arc_read calls occurring on a system, in real time. To do this, a list was added to the in memory SPA data structure for a pool, with each element on the list corresponding to a call to arc_read. These entries are then exported through the kstat interface, which can then be interpreted in userspace. For each arc_read call, the following information is exported: * A unique identifier (uint64_t) * The time the entry was added to the list (hrtime_t) (*not* wall clock time; relative to the other entries on the list) * The objset ID (uint64_t) * The object number (uint64_t) * The indirection level (uint64_t) * The block ID (uint64_t) * The name of the function originating the arc_read call (char[24]) * The arc_flags from the arc_read call (uint32_t) * The PID of the reading thread (pid_t) * The command or name of thread originating read (char[16]) From this exported information one can see, in real time, exactly what is being read, what function is generating the read, and whether or not the read was found to be already cached. There is still some work to be done, but this should serve as a good starting point. Specifically, dbuf_read's are not accounted for in the currently exported information. Thus, a follow up patch should probably be added to export these calls that never call into arc_read (they only hit the dbuf hash table). In addition, it might be nice to create a utility similar to "arcstat.py" to digest the exported information and display it in a more readable format. Or perhaps, log the information and allow for it to be "replayed" at a later time. Signed-off-by: Prakash Surya <surya1@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-09-06 23:09:05 +00:00
#endif
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