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Run a revision of the devstat interface:

Browse Source 
Kernel:

Change statistics to use the *uptime() timescale (ie: relative to
boottime) rather than the UTC aligned timescale.  This makes the
device statistics code oblivious to clock steps.

Change timestamps to bintime format, they are cheaper.

Remove the "busy_count", and replace it with two counter fields:
"start_count" and "end_count", which are updated in the down and
up paths respectively.  This removes the locking constraint on
devstat.

Add a timestamp argument to devstat_start_transaction(), this will
normally be a timestamp set by the *_bio() function in bp->bio_t0.
Use this field to calculate duration of I/O operations.

Add two timestamp arguments to devstat_end_transaction(), one is
the current time, a NULL pointer means "take timestamp yourself",
the other is the timestamp of when this transaction started (see
above).

Change calculation of busy_time to operate on "the salami principle":
Only when we are idle, which we can determine by the start+end
counts being identical, do we update the "busy_from" field in the
down path.  In the up path we accumulate the timeslice in busy_time
and update busy_from.

Change the byte_* and num_* fields into two arrays: bytes[] and
operations[].

Userland:

Change the misleading "busy_time" name to be called "snap_time" and
make the time long double since that is what most users need anyway,
fill it using clock_gettime(CLOCK_MONOTONIC) to put it on the same
timescale as the kernel fields.

Change devstat_compute_etime() to operate on struct bintime.

Remove the version 2 legacy interface: the change to bintime makes
compatibility far too expensive.

Fix a bug in systat's "vm" page where boot relative busy times would
be bogus.

Bump __FreeBSD_version to 500107

Review & Collaboration by:	ken
This commit is contained in:
phk 2003-03-15 21:59:06 +00:00
parent d16675cd85
commit f432014308
12 changed files with 163 additions and 263 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
lib/libdevstat/Makefile
View File

@ -3,7 +3,8 @@
MAINTAINER=ken@FreeBSD.ORG
LIB= devstat
SHLIB_MAJOR= 3
# Bump DEVSTAT_USER_API_VER in devstat.h every time this is incremented.
SHLIB_MAJOR= 4
SRCS= devstat.c
INCS= devstat.h

126
lib/libdevstat/devstat.c
View File

@ -315,6 +315,7 @@ devstat_getdevs(kvm_t *kd, struct statinfo *stats)
int retval = 0;
struct devinfo *dinfo;
const char *func_name = "devstat_getdevs";
struct timespec ts;
dinfo = stats->dinfo;
@ -327,8 +328,8 @@ devstat_getdevs(kvm_t *kd, struct statinfo *stats)
oldnumdevs = dinfo->numdevs;
oldgeneration = dinfo->generation;
/* Get the current time when we get the stats */
gettimeofday(&stats->busy_time, NULL);
clock_gettime(CLOCK_MONOTONIC, &ts);
stats->snap_time = ts.tv_sec + ts.tv_nsec * 1e-9;
if (kd == NULL) {
/* If this is our first time through, mem_ptr will be null. */
@ -338,7 +339,7 @@ devstat_getdevs(kvm_t *kd, struct statinfo *stats)
* error. Don't bother setting the error string, since
* getnumdevs() has already done that for us.
*/
if ((dinfo->numdevs = getnumdevs()) < 0)
if ((dinfo->numdevs = devstat_getnumdevs(NULL)) < 0)
return(-1);
/*
@ -371,9 +372,9 @@ devstat_getdevs(kvm_t *kd, struct statinfo *stats)
if (errno == ENOMEM) {
/*
* No need to set the error string here,
* getnumdevs() will do that if it fails.
* devstat_getnumdevs() will do that if it fails.
*/
if ((dinfo->numdevs = getnumdevs()) < 0)
if ((dinfo->numdevs = devstat_getnumdevs(NULL)) < 0)
return(-1);
dssize = (dinfo->numdevs *
@ -403,7 +404,7 @@ devstat_getdevs(kvm_t *kd, struct statinfo *stats)
* This is of course non-atomic, but since we are working
* on a core dump, the generation is unlikely to change
*/
if ((dinfo->numdevs = getnumdevs()) == -1)
if ((dinfo->numdevs = devstat_getnumdevs(NULL)) == -1)
return(-1);
if ((dinfo->mem_ptr = get_devstat_kvm(kd)) == NULL)
return(-1);
@ -430,8 +431,8 @@ devstat_getdevs(kvm_t *kd, struct statinfo *stats)
* necessary.
*/
if (oldgeneration != dinfo->generation) {
if (getnumdevs() != dinfo->numdevs) {
if ((dinfo->numdevs = getnumdevs()) < 0)
if (devstat_getnumdevs(NULL) != dinfo->numdevs) {
if ((dinfo->numdevs = devstat_getnumdevs(NULL)) < 0)
return(-1);
dssize = (dinfo->numdevs * sizeof(struct devstat)) +
sizeof(long);
@ -1142,21 +1143,21 @@ compute_stats(struct devstat *current, struct devstat *previous,
DSM_NONE));
}
/* This is 1/2^64 */
#define BINTIME_SCALE 5.42101086242752217003726400434970855712890625e-20
long double
devstat_compute_etime(struct timeval cur_time, struct timeval prev_time)
devstat_compute_etime(struct bintime *cur_time, struct bintime *prev_time)
{
struct timeval busy_time;
u_int64_t busy_usec;
long double etime;
timersub(&cur_time, &prev_time, &busy_time);
busy_usec = busy_time.tv_sec;
busy_usec *= 1000000;
busy_usec += busy_time.tv_usec;
etime = busy_usec;
etime /= 1000000;
etime = cur_time->sec;
etime += cur_time->frac * BINTIME_SCALE;
if (prev_time != NULL) {
etime -= prev_time->sec;
etime -= prev_time->frac * BINTIME_SCALE;
}
return(etime);
}
@ -1186,21 +1187,21 @@ devstat_compute_statistics(struct devstat *current, struct devstat *previous,
return(-1);
}
totalbytesread = current->bytes_read -
((previous) ? previous->bytes_read : 0);
totalbyteswrite = current->bytes_written -
((previous) ? previous->bytes_written : 0);
totalbytesread = current->bytes[DEVSTAT_READ] -
((previous) ? previous->bytes[DEVSTAT_READ] : 0);
totalbyteswrite = current->bytes[DEVSTAT_WRITE] -
((previous) ? previous->bytes[DEVSTAT_WRITE] : 0);
totalbytes = totalbytesread + totalbyteswrite;
totaltransfersread = current->num_reads -
((previous) ? previous->num_reads : 0);
totaltransfersread = current->operations[DEVSTAT_READ] -
((previous) ? previous->operations[DEVSTAT_READ] : 0);
totaltransferswrite = current->num_writes -
((previous) ? previous->num_writes : 0);
totaltransferswrite = current->operations[DEVSTAT_WRITE] -
((previous) ? previous->operations[DEVSTAT_WRITE] : 0);
totaltransfersother = current->num_other -
((previous) ? previous->num_other : 0);
totaltransfersother = current->operations[DEVSTAT_NO_DATA] -
((previous) ? previous->operations[DEVSTAT_NO_DATA] : 0);
totaltransfers = totaltransfersread + totaltransferswrite +
totaltransfersother;
@ -1496,7 +1497,7 @@ get_devstat_kvm(kvm_t *kd)
char *rv = NULL;
const char *func_name = "get_devstat_kvm";
if ((num_devs = getnumdevs()) <= 0)
if ((num_devs = devstat_getnumdevs(kd)) <= 0)
return(NULL);
error = 0;
if (KREADNL(kd, X_DEVICE_STATQ, dhead) == -1)
@ -1510,7 +1511,7 @@ get_devstat_kvm(kvm_t *kd)
func_name);
return(NULL);
}
gen = getgeneration();
gen = devstat_getgeneration(kd);
memcpy(rv, &gen, sizeof(gen));
wp = sizeof(gen);
/*
@ -1536,66 +1537,3 @@ get_devstat_kvm(kvm_t *kd)
}
return(rv);
}
/*
* Compatability functions for libdevstat 2. These are deprecated and may
* eventually be removed.
*/
int
getnumdevs(void)
{
return(devstat_getnumdevs(NULL));
}
long
getgeneration(void)
{
return(devstat_getgeneration(NULL));
}
int
getversion(void)
{
return(devstat_getversion(NULL));
}
int
checkversion(void)
{
return(devstat_checkversion(NULL));
}
int
getdevs(struct statinfo *stats)
{
return(devstat_getdevs(NULL, stats));
}
int
selectdevs(struct device_selection **dev_select, int *num_selected,
int *num_selections, long *select_generation,
long current_generation, struct devstat *devices, int numdevs,
struct devstat_match *matches, int num_matches,
char **dev_selections, int num_dev_selections,
devstat_select_mode select_mode, int maxshowdevs,
int perf_select)
{
return(devstat_selectdevs(dev_select, num_selected, num_selections,
select_generation, current_generation, devices, numdevs,
matches, num_matches, dev_selections, num_dev_selections,
select_mode, maxshowdevs, perf_select));
}
int
buildmatch(char *match_str, struct devstat_match **matches,
int *num_matches)
{
return(devstat_buildmatch(match_str, matches, num_matches));
}
long double
compute_etime(struct timeval cur_time, struct timeval prev_time)
{
return(devstat_compute_etime(cur_time, prev_time));
}

40
lib/libdevstat/devstat.h
View File

@ -35,6 +35,16 @@
#include <kvm.h>
/*
* Bumped every time we change the userland API. Hopefully this doesn't
* happen very often! This should be bumped every time we have to
* increment SHLIB_MAJOR in the libdevstat Makefile (for non-backwards
* compatible API changes) and should also be bumped every time we make
* backwards-compatible API changes, so application writers have a way to
* determine when a particular feature is available.
*/
#define DEVSTAT_USER_API_VER 4
#define DEVSTAT_ERRBUF_SIZE 2048 /* size of the devstat library error string */
extern char devstat_errbuf[];
@ -111,7 +121,7 @@ struct statinfo {
long tk_nin;
long tk_nout;
struct devinfo *dinfo;
struct timeval busy_time;
long double snap_time;
};
typedef enum {
@ -122,31 +132,7 @@ typedef enum {
} devstat_select_mode;
__BEGIN_DECLS
/* Legacy interfaces. */
int getnumdevs(void);
long getgeneration(void);
int getversion(void);
int checkversion(void);
int getdevs(struct statinfo *stats);
int selectdevs(struct device_selection **dev_select, int *num_selected,
int *num_selections, long *select_generation,
long current_generation, struct devstat *devices, int numdevs,
struct devstat_match *matches, int num_matches,
char **dev_selections, int num_dev_selections,
devstat_select_mode select_mode, int maxshowdevs,
int perf_select);
int buildmatch(char *match_str, struct devstat_match **matches,
int *num_matches);
int compute_stats(struct devstat *current, struct devstat *previous,
long double etime, u_int64_t *total_bytes,
u_int64_t *total_transfers, u_int64_t *total_blocks,
long double *kb_per_transfer,
long double *transfers_per_second, long double *mb_per_second,
long double *blocks_per_second,
long double *ms_per_transaction);
long double compute_etime(struct timeval cur_time, struct timeval prev_time);
/* New interfaces. */
int devstat_getnumdevs(kvm_t *kd);
long devstat_getgeneration(kvm_t *kd);
int devstat_getversion(kvm_t *kd);
@ -164,8 +150,8 @@ int devstat_buildmatch(char *match_str, struct devstat_match **matches,
int devstat_compute_statistics(struct devstat *current,
struct devstat *previous,
long double etime, ...);
long double devstat_compute_etime(struct timeval cur_time,
struct timeval prev_time);
long double devstat_compute_etime(struct bintime *cur_time,
struct bintime *prev_time);
__END_DECLS
#endif /* _DEVSTAT_H */

9
libexec/rpc.rstatd/rstat_proc.c
View File

@ -370,7 +370,7 @@ haveadisk(void)
void
updatexfers(int numdevs, int *devs)
{
register int i, j, t;
register int i, j, k, t;
struct statinfo stats;
int num_devices = 0;
u_int64_t total_transfers;
@ -400,9 +400,10 @@ updatexfers(int numdevs, int *devs)
& DEVSTAT_TYPE_MASK) == DEVSTAT_TYPE_DIRECT)
&& ((stats.dinfo->devices[i].device_type
& DEVSTAT_TYPE_PASS) == 0)) {
total_transfers = stats.dinfo->devices[i].num_reads +
stats.dinfo->devices[i].num_writes +
stats.dinfo->devices[i].num_other;
total_transfers = 0;
for (k = 0; k < DEVSTAT_N_TRANS_FLAGS; k++)
total_transfers +=
stats.dinfo->devices[i].operations[k];
/*
* XXX KDM If the total transfers for this device
* are greater than the amount we can fit in a

4
sys/cam/cam_periph.c
View File

@ -866,7 +866,7 @@ cam_periph_runccb(union ccb *ccb,
* this particular type of ccb, record the transaction start.
*/
if ((ds != NULL) && (ccb->ccb_h.func_code == XPT_SCSI_IO))
devstat_start_transaction(ds);
devstat_start_transaction(ds, NULL);
xpt_action(ccb);
@ -896,7 +896,7 @@ cam_periph_runccb(union ccb *ccb,
CAM_DIR_NONE) ? DEVSTAT_NO_DATA :
(ccb->ccb_h.flags & CAM_DIR_OUT) ?
DEVSTAT_WRITE :
DEVSTAT_READ);
DEVSTAT_READ, NULL, NULL);
return(error);
}

95
sys/kern/subr_devstat.c
View File

@ -156,7 +156,7 @@ devstat_add_entry(struct devstat *ds, const char *dev_name,
ds->flags = flags;
ds->device_type = device_type;
ds->priority = priority;
getmicrotime(&ds->dev_creation_time);
binuptime(&ds->creation_time);
}
/*
@ -183,9 +183,12 @@ devstat_remove_entry(struct devstat *ds)
/*
* Record a transaction start.
*
* See comments for devstat_end_transaction(). Ordering is very important
* here.
*/
void
devstat_start_transaction(struct devstat *ds)
devstat_start_transaction(struct devstat *ds, struct bintime *now)
{
/* sanity check */
if (ds == NULL)
@ -196,9 +199,21 @@ devstat_start_transaction(struct devstat *ds)
* to busy. The start time is really the start of the latest busy
* period.
*/
if (ds->busy_count == 0)
getmicrouptime(&ds->start_time);
ds->busy_count++;
if (ds->start_count == ds->end_count) {
if (now != NULL)
ds->busy_from = *now;
else
binuptime(&ds->busy_from);
}
ds->start_count++;
}
void
devstat_start_transaction_bio(struct devstat *ds, struct bio *bp)
{
binuptime(&bp->bio_t0);
devstat_start_transaction(ds, &bp->bio_t0);
}
void
@ -210,35 +225,35 @@ devstat_start_transaction_bio(struct devstat *ds, struct bio *bp)
/*
* Record the ending of a transaction, and incrment the various counters.
*
* Ordering in this function, and in devstat_start_transaction() is VERY
* important. The idea here is to run without locks, so we are very
* careful to only modify some fields on the way "down" (i.e. at
* transaction start) and some fields on the way "up" (i.e. at transaction
* completion). One exception is busy_from, which we only modify in
* devstat_start_transaction() when there are no outstanding transactions,
* and thus it can't be modified in devstat_end_transaction()
* simultaneously.
*/
void
devstat_end_transaction(struct devstat *ds, u_int32_t bytes,
devstat_tag_type tag_type, devstat_trans_flags flags)
devstat_tag_type tag_type, devstat_trans_flags flags,
struct bintime *now, struct bintime *then)
{
struct timeval busy_time;
struct bintime dt, lnow;
/* sanity check */
if (ds == NULL)
return;
getmicrouptime(&ds->last_comp_time);
ds->busy_count--;
if (now == NULL) {
now = &lnow;
binuptime(now);
}
/*
* There might be some transactions (DEVSTAT_NO_DATA) that don't
* transfer any data.
*/
if (flags == DEVSTAT_READ) {
ds->bytes_read += bytes;
ds->num_reads++;
} else if (flags == DEVSTAT_WRITE) {
ds->bytes_written += bytes;
ds->num_writes++;
} else if (flags == DEVSTAT_FREE) {
ds->bytes_freed += bytes;
ds->num_frees++;
} else
ds->num_other++;
/* Update byte and operations counts */
ds->bytes[flags] += bytes;
ds->operations[flags]++;
/*
* Keep a count of the various tag types sent.
@ -247,21 +262,20 @@ devstat_end_transaction(struct devstat *ds, u_int32_t bytes,
tag_type != DEVSTAT_TAG_NONE)
ds->tag_types[tag_type]++;
/*
* We only update the busy time when we go idle. Otherwise, this
* calculation would require many more clock cycles.
*/
if (ds->busy_count == 0) {
/* Calculate how long we were busy */
busy_time = ds->last_comp_time;
timevalsub(&busy_time, &ds->start_time);
if (then != NULL) {
/* Update duration of operations */
dt = *now;
bintime_sub(&dt, then);
bintime_add(&ds->duration[flags], &dt);
}
/* Add our busy time to the total busy time. */
timevaladd(&ds->busy_time, &busy_time);
} else if (ds->busy_count < 0)
printf("devstat_end_transaction: HELP!! busy_count "
"for %s%d is < 0 (%d)!\n", ds->device_name,
ds->unit_number, ds->busy_count);
/* Accumulate busy time */
dt = *now;
bintime_sub(&dt, &ds->busy_from);
bintime_add(&ds->busy_time, &dt);
ds->busy_from = *now;
ds->end_count++;
}
void
@ -277,7 +291,7 @@ devstat_end_transaction_bio(struct devstat *ds, struct bio *bp)
flg = DEVSTAT_WRITE;
devstat_end_transaction(ds, bp->bio_bcount - bp->bio_resid,
DEVSTAT_TAG_SIMPLE, flg);
DEVSTAT_TAG_SIMPLE, flg, NULL, &bp->bio_t0);
}
/*
@ -427,3 +441,6 @@ devstat_free(struct devstat *dsp)
}
}
}
SYSCTL_INT(_debug_sizeof, OID_AUTO, devstat, CTLFLAG_RD,
0, sizeof(struct devstat), "sizeof(struct devstat)");

101
sys/sys/devicestat.h
View File

@ -48,7 +48,7 @@
* userland utilities to determine whether or not they are in sync with the
* kernel.
*/
#define DEVSTAT_VERSION 5
#define DEVSTAT_VERSION 6
/*
* These flags specify which statistics features are supported or not
@ -68,6 +68,7 @@ typedef enum {
DEVSTAT_WRITE = 0x02,
DEVSTAT_FREE = 0x03
} devstat_trans_flags;
#define DEVSTAT_N_TRANS_FLAGS 4
typedef enum {
DEVSTAT_TAG_SIMPLE = 0x00,
@ -124,8 +125,15 @@ typedef enum {
} devstat_type_flags;
struct devstat {
int sequence0; /* Update sequence# */
/* Internal house-keeping fields */
u_int sequence0; /* Update sequence# */
int allocated; /* Allocated entry */
u_int start_count; /* started ops */
u_int end_count; /* completed ops */
struct bintime busy_from; /*
* busy time unaccounted
* for since this time
*/
STAILQ_ENTRY(devstat) dev_links;
u_int32_t device_number; /*
* Devstat device
@ -133,44 +141,13 @@ struct devstat {
*/
char device_name[DEVSTAT_NAME_LEN];
int unit_number;
u_int64_t bytes_read; /*
* Total bytes read
* from a device.
*/
u_int64_t bytes_written; /*
* Total bytes written
* to a device.
*/
u_int64_t bytes_freed; /*
* Total bytes freed
* from a device.
*/
u_int64_t num_reads; /*
* Total number of
* read requests to
* the device.
*/
u_int64_t num_writes; /*
* Total number of
* write requests to
* the device.
*/
u_int64_t num_frees; /*
* Total number of
* free requests to
* the device.
*/
u_int64_t num_other; /*
* Total number of
* transactions that
* don't read or write
* data.
*/
int32_t busy_count; /*
* Total number of
* transactions
* outstanding for
* the device.
u_int64_t bytes[DEVSTAT_N_TRANS_FLAGS];
u_int64_t operations[DEVSTAT_N_TRANS_FLAGS];
struct bintime duration[DEVSTAT_N_TRANS_FLAGS];
struct bintime busy_time;
struct bintime creation_time; /*
* Time the device was
* created.
*/
u_int32_t block_size; /* Block size, bytes */
u_int64_t tag_types[3]; /*
@ -179,28 +156,6 @@ struct devstat {
* and head of queue
* tags sent.
*/
struct timeval dev_creation_time; /*
* Time the device was
* created.
*/
struct timeval busy_time; /*
* Total amount of
* time drive has spent
* processing requests.
*/
struct timeval start_time; /*
* The time when
* busy_count was
* last == 0. Or, the
* start of the latest
* busy period.
*/
struct timeval last_comp_time; /*
* Last time a
* transaction was
* completed.
*/
devstat_support_flags flags; /*
* Which statistics
* are supported by a
@ -208,8 +163,11 @@ struct devstat {
*/
devstat_type_flags device_type; /* Device type */
devstat_priority priority; /* Controls list pos. */
int sequence1; /* Update sequence# */
void *id; /*
* Identification for
* GEOM nodes
*/
u_int sequence1; /* Update sequence# */
};
STAILQ_HEAD(devstatlist, devstat);
@ -217,18 +175,19 @@ STAILQ_HEAD(devstatlist, devstat);
#ifdef _KERNEL
struct bio;
struct devstat *devstat_new_entry(const char *dev_name,
int unit_number, u_int32_t block_size,
devstat_support_flags flags,
devstat_type_flags device_type,
devstat_priority priority);
struct devstat *devstat_new_entry(const char *dev_name, int unit_number,
u_int32_t block_size,
devstat_support_flags flags,
devstat_type_flags device_type,
devstat_priority priority);
void devstat_remove_entry(struct devstat *ds);
void devstat_start_transaction(struct devstat *ds);
void devstat_start_transaction(struct devstat *ds, struct bintime *now);
void devstat_start_transaction_bio(struct devstat *ds, struct bio *bp);
void devstat_end_transaction(struct devstat *ds, u_int32_t bytes,
devstat_tag_type tag_type,
devstat_trans_flags flags);
devstat_trans_flags flags,
struct bintime *now, struct bintime *then);
void devstat_end_transaction_bio(struct devstat *ds, struct bio *bp);
#endif

2
sys/sys/param.h
View File

@ -55,7 +55,7 @@
* doc/en_US.ISO8859-1/books/porters-handbook/book.sgml
*/
#undef __FreeBSD_version
#define __FreeBSD_version 500106 /* Master, propagated to newvers */
#define __FreeBSD_version 500107 /* Master, propagated to newvers */
#ifndef NULL
#define NULL 0

4
usr.bin/systat/iostat.c
View File

@ -148,8 +148,6 @@ fetchiostat()
last.dinfo = cur.dinfo;
cur.dinfo = tmp_dinfo;
last.busy_time = cur.busy_time;
/*
* Here what we want to do is refresh our device stats.
* getdevs() returns 1 when the device list has changed.
@ -322,7 +320,7 @@ devstats(row, _col, dn)
di = dev_select[dn].position;
busy_seconds = devstat_compute_etime(cur.busy_time, last.busy_time);
busy_seconds = cur.snap_time - last.snap_time;
if (devstat_compute_statistics(&cur.dinfo->devices[di],
&last.dinfo->devices[di], busy_seconds,

26
usr.bin/systat/vmstat.c
View File

@ -798,7 +798,7 @@ getinfo(ls)
last.dinfo = cur.dinfo;
cur.dinfo = tmp_dinfo;
last.busy_time = cur.busy_time;
last.snap_time = cur.snap_time;
switch (devstat_getdevs(NULL, &cur)) {
case -1:
errx(1, "%s", devstat_errbuf);
@ -852,12 +852,19 @@ dinfo(dn, lc, now, then)
di = dev_select[dn].position;
elapsed_time = devstat_compute_etime(now->busy_time,
then ? then->busy_time : now->dinfo->devices[di].dev_creation_time);
device_busy = devstat_compute_etime(now->dinfo->devices[di].busy_time,
then ? then->dinfo->devices[di].busy_time :
now->dinfo->devices[di].dev_creation_time);
if (then != NULL) {
/* Calculate relative to previous sample */
elapsed_time = now->snap_time - then->snap_time;
device_busy = devstat_compute_etime(
&now->dinfo->devices[di].busy_time,
&then->dinfo->devices[di].busy_time);
} else {
/* Calculate relative to device creation */
elapsed_time = now->snap_time - devstat_compute_etime(
&now->dinfo->devices[di].creation_time, NULL);
device_busy = devstat_compute_etime(
&now->dinfo->devices[di].busy_time, NULL);
}
if (devstat_compute_statistics(&now->dinfo->devices[di], then ?
&then->dinfo->devices[di] : NULL, elapsed_time,
@ -866,11 +873,6 @@ dinfo(dn, lc, now, then)
DSM_NONE) != 0)
errx(1, "%s", devstat_errbuf);
if ((device_busy == 0) && (transfers_per_second > 5))
/* the device has been 100% busy, fake it because
* as long as the device is 100% busy the busy_time
* field in the devstat struct is not updated */
device_busy = elapsed_time;
if (device_busy > elapsed_time)
/* this normally happens after one or more periods
* where the device has been 100% busy, correct it */

4
usr.bin/vmstat/vmstat.c
View File

@ -428,7 +428,7 @@ dovmstat(interval, reps)
tmp_dinfo = last.dinfo;
last.dinfo = cur.dinfo;
cur.dinfo = tmp_dinfo;
last.busy_time = cur.busy_time;
last.snap_time = cur.snap_time;
/*
* Here what we want to do is refresh our device stats.
@ -680,7 +680,7 @@ devstats()
last.cp_time[state] = tmp;
}
busy_seconds = devstat_compute_etime(cur.busy_time, last.busy_time);
busy_seconds = cur.snap_time - last.snap_time;
for (dn = 0; dn < num_devices; dn++) {
int di;

12
usr.sbin/iostat/iostat.c
View File

@ -407,12 +407,10 @@ main(int argc, char **argv)
cur.tk_nin = 0;
/*
* Set the busy time to the system boot time, so the stats are
* calculated since system boot.
* Set the snap time to the system boot time (ie: zero), so the
* stats are calculated since system boot.
*/
if (readvar(kd, "kern.boottime", X_BOOTTIME, &cur.busy_time,
sizeof(cur.busy_time)) != 0)
exit(1);
cur.snap_time = 0;
/*
* If the user stops the program (control-Z) and then resumes it,
@ -452,7 +450,7 @@ main(int argc, char **argv)
last.dinfo = cur.dinfo;
cur.dinfo = tmp_dinfo;
last.busy_time = cur.busy_time;
last.snap_time = cur.snap_time;
/*
* Here what we want to do is refresh our device stats.
@ -538,7 +536,7 @@ main(int argc, char **argv)
last.tk_nout = tmp;
}
etime = devstat_compute_etime(cur.busy_time, last.busy_time);
etime = cur.snap_time - last.snap_time;
if (etime == 0.0)
etime = 1.0;