Commit Graph

31 Commits

Author SHA1 Message Date
imp
cf874b345d Back out M_* changes, per decision of the TRB.
Approved by: trb
2003-02-19 05:47:46 +00:00
phk
8bf75a2e40 Implement a bio-taskqueue to reduce number of context switches in
disk I/O processing.

        The intent is that the disk driver in its hardware interrupt
        routine will simply schedule the bio on the task queue with
        a routine to finish off whatever needs done.

        The g_up thread will then schedule this routine, the likely
        outcome of which is a biodone() which queues the bio on
        g_up's regular queue where it will be picked up and processed.

        Compared to the using the regular taskqueue, this saves one
        contextswitch.

Change our scheduling of the g_up and g_down queues to be water-tight,
at the cost of breaking the userland regression test-shims.

Input and ideas from:   scottl
2003-02-11 22:30:26 +00:00
phk
064989983a Don't short-circuit zero-length requests of they are BIO_[SG]ETATTR. 2003-02-11 13:13:10 +00:00
phk
89a4ec072e Turn the "updating" flag (back) into two sequence number fields at
either ends of the structure so we have a way to determine if a
snapshot is consistent.
2003-02-11 11:01:26 +00:00
phk
ee425616b7 Update the statistics collection code to track busy time instead of
idle time.

Statistics now default to "on" and can be turned off with
        sysctl kern.geom.collectstats=0

Performance impact of statistics collection is on the order of
800 nsec per consumer/provider set on a 700MHz Athlon.
2003-02-09 17:04:57 +00:00
phk
04a4ba381f Move the g_stat struct to its own .h file, we will export it to other code.
Insted of embedding a struct g_stat in consumers and providers, merely
include a pointer.

Remove a couple of <sys/time.h> includes now unneeded.

Add a special allocator for struct g_stat.  This allocator will allocate
entire pages and hand out g_stat functions from there.  The "id" field
indicates free/used status.

Add "/dev/geom.stats" device driver whic exports the pages from the
allocator to userland with mmap(2) in read-only mode.

This mmap(2) interface should be considered a non-public interface and
the functions in libgeom (not yet committed) should be used to access
the statistics data.
2003-02-08 13:03:57 +00:00
phk
e8f2dea5dd Commit the correct copy of the g_stat structure.
Add debug.sizeof.g_stat sysctl.

Set the id field of the g_stat when we create consumers and providers.

Remove biocount from consumer, we will use the counters in the g_stat
structure instead.  Replace one field which will need to be atomically
manipulated with two fields which will not (stat.nop and stat.nend).

Change add companion field to bio_children: bio_inbed for the exact
same reason.

Don't output the biocount in the confdot output.

Fix KASSERT in g_io_request().

Add sysctl kern.geom.collectstats defaulting to off.

Collect the following raw statistics conditioned on this sysctl:

    for each consumer and provider {
        total number of operations started.
        total number of operations completed.
        time last operation completed.
        sum of idle-time.
        for each of BIO_READ, BIO_WRITE and BIO_DELETE {
            number of operations completed.
            number of bytes completed.
            number of ENOMEM errors.
            number of other errors.
            sum of transaction time.
        }
    }

API for getting hold of these statistics data not included yet.
2003-02-07 23:08:24 +00:00
phk
0d87d64253 Rename bio_linkage to the more obvious bio_parent.
Add bio_t0 timestamp, and include <sys/time.h> where needed
2003-02-07 21:09:51 +00:00
phk
ef9c55f6aa Put the checks we perform on a bio before calling ::start in their
own function, handle all validation and truncation at the time we
process the bio instead of when it gets scheduled.
2003-02-06 21:01:36 +00:00
alfred
bf8e8a6e8f Remove M_TRYWAIT/M_WAITOK/M_WAIT. Callers should use 0.
Merge M_NOWAIT/M_DONTWAIT into a single flag M_NOWAIT.
2003-01-21 08:56:16 +00:00
phk
516da34ba8 white-space changes 2002-12-26 21:02:50 +00:00
phk
4052863334 Balk at unaligned requests.
MFC candidate.
2002-12-18 19:53:59 +00:00
phk
982f8bb0ad malloc(9) with M_NOWAIT seems to return NULL a lot more than I would have
expected under -current.  This is a problem for GEOM because the up/down
threads cannot sleep waiting for memory to become free.  The reason they
cannot sleep is that paging things out to disk may be the only way we can
clear up some RAM.  Nice catch-22 there.

Implement a rudimentary ENOMEM recovery strategy:  If an I/O request
fails with an error code of ENOMEM, schedule it for a retry, and
tell the down-thread to sleep hz/10 to get other parts of the system
a chance to free up some memory, in particular the up-path in GEOM.

All caches should probably start to monitor malloc(9) failures using the new
malloc_last_fail() function, and release when it indicates congestion.

Sponsored by:	DARPA & NAI Labs.
2002-11-02 11:08:07 +00:00
phk
83404357e9 Don't track bio allocation in debug output.
Sponsored by:	DARPA & NAI Labs.
2002-10-20 08:45:17 +00:00
phk
8298a7f6ad Add more KASSERTS.
Sponsored by:	DARPA & NAI Labs.
2002-10-14 10:02:24 +00:00
phk
08c1778957 Add support g_clone_bio() and g_std_done() to spawn multiple children
of a bio and correctly gather status when done.

Sponsored by:	DARPA & NAI Labs.
2002-10-09 07:11:59 +00:00
phk
865428f1db For now, don't wait for drives to stop returning EBUSY. There is too
much broken harware around it seems.

Sponsored by:	DARPA & NAI Labs.
2002-10-08 07:03:58 +00:00
phk
f290022d05 Put a printf under #ifdef DIAGNOSTIC.
Sponsored by: DARPA & NAI Labs.
2002-10-07 06:57:00 +00:00
phk
852521acba Retire g_io_fail() and let g_io_deliver() take an error argument instead.
Sponsored by:	DARPA & NAI Labs.
2002-09-30 08:54:46 +00:00
phk
72d7c1eb0e Introduce g_write_data() function.
Sponsored by:	DARPA & NAI Labs
2002-09-30 08:50:47 +00:00
phk
b5231fc7a7 Void functions cannot use return(foo) even if foo is also returning void.
Sponsored by:	DARPA & NAI Labs.
2002-09-28 11:43:20 +00:00
phk
3a17cc7881 Setattr should not retry on EBUSY, we could get EBUSY back because
a disklabel modification tries to change an open device, and no
counter-examples exists.

Be less facist about when we can do Setattr, the openmodes of devices
are so loosely managed that the "exclusive" count is almost useless.

Sponsored by:   DARPA & NAI Labs.
2002-09-27 21:12:47 +00:00
phk
0aade3f175 Allocate bio's with M_NOWAIT and let the caller deal with the problems.
Sponsored by:	DARPA & NAI Labs.
2002-09-27 20:53:47 +00:00
phk
39330dc632 Use biowait() rather than DIY.
Sponsored by:	DARPA & NAI Labs
2002-09-13 11:39:11 +00:00
phk
0d0d0abc10 Don't grab Giant around malloc(9) and free(9).
Don't grab Giant around wakeup(9).
Don't print verbose messages about each device found in geom_dev.
Various cleanups.

Sponsored by: DARPA & NAI Labs.
2002-05-20 10:03:15 +00:00
phk
6ec0e5c95f Constifixation of attribute argument to g_io_[gs]etattr()
Sponsored by:	DARPA & NAI Labs
2002-04-09 15:12:05 +00:00
jhb
db9aa81e23 Change callers of mtx_init() to pass in an appropriate lock type name. In
most cases NULL is passed, but in some cases such as network driver locks
(which use the MTX_NETWORK_LOCK macro) and UMA zone locks, a name is used.

Tested on:	i386, alpha, sparc64
2002-04-04 21:03:38 +00:00
phk
db493db577 Centralize EOF handling and improve access controls for bio scheduling.
Sponsored by:	DARPA & NAI Labs
2002-04-04 09:58:20 +00:00
phk
aeded84143 Eliminate some thread pointers which do not make sense anymore.
Split private parts of geom.h into geom_int.h.  The latter should
never be included in class implemtations.
2002-03-26 22:07:38 +00:00
phk
3d1eaf5230 Push BIO_FORMAT into a local hack inside the floppy drivers where
it belongs.
2002-03-26 19:16:37 +00:00
phk
3e53a43775 First commit of the GEOM subsystem to make it easier for people to
test and play with this.

This is not yet production quality and should be run only on dedicated
test boxes.

For people who want to develop transformations for GEOM there exist a
set of shims to run geom in userland (ask phk@freebsd.org).

Reports of all kinds to: phk@freebsd.org
Please include in report:
        dmesg
        sysctl debug.geomdot
        sysctl debug.geomconf

Known significant limitations:
        no kernel dump facility.
        ioctls severely restricted.

Sponsored by:   DARPA, NAI Labs
2002-03-11 21:42:35 +00:00