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Illumos #3329, #3330, #3331, #3335

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3329 spa_sync() spends 10-20% of its time in spa_free_sync_cb()
3330 space_seg_t should have its own kmem_cache
3331 deferred frees should happen after sync_pass 1
3335 make SYNC_PASS_* constants tunable

Reviewed by: Adam Leventhal <ahl@delphix.com>
Reviewed by: Matt Ahrens <matthew.ahrens@delphix.com>
Reviewed by: Christopher Siden <chris.siden@delphix.com>
Reviewed by: Eric Schrock <eric.schrock@delphix.com>
Reviewed by: Richard Lowe <richlowe@richlowe.net>
Reviewed by: Dan McDonald <danmcd@nexenta.com>
Approved by: Eric Schrock <eric.schrock@delphix.com>

References:
  illumos/illumos-gate@01f55e48fb
  https://www.illumos.org/issues/3329
  https://www.illumos.org/issues/3330
  https://www.illumos.org/issues/3331
  https://www.illumos.org/issues/3335

Ported-by: Brian Behlendorf <behlendorf1@llnl.gov>
This commit is contained in:
George Wilson 2013-05-06 10:14:52 -07:00 committed by Brian Behlendorf
parent 5853fe790d
commit 55d85d5a8c
9 changed files with 75 additions and 22 deletions
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5
include/sys/metaslab_impl.h
View File

@ -21,7 +21,10 @@
/*
* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
* Copyright (c) 2011 by Delphix. All rights reserved.
*/
/*
* Copyright (c) 2012 by Delphix. All rights reserved.
*/
#ifndef _SYS_METASLAB_IMPL_H

8
include/sys/spa.h
View File

@ -486,13 +486,7 @@ extern int spa_scan_stop(spa_t *spa);
extern void spa_sync(spa_t *spa, uint64_t txg); /* only for DMU use */
extern void spa_sync_allpools(void);
/*
* DEFERRED_FREE must be large enough that regular blocks are not
* deferred. XXX so can't we change it back to 1?
*/
#define SYNC_PASS_DEFERRED_FREE 2 /* defer frees after this pass */
#define SYNC_PASS_DONT_COMPRESS 4 /* don't compress after this pass */
#define SYNC_PASS_REWRITE 1 /* rewrite new bps after this pass */
extern int zfs_sync_pass_deferred_free;
/* spa namespace global mutex */
extern kmutex_t spa_namespace_lock;

6
include/sys/space_map.h
View File

@ -23,6 +23,10 @@
* Use is subject to license terms.
*/
/*
* Copyright (c) 2012 by Delphix. All rights reserved.
*/
#ifndef _SYS_SPACE_MAP_H
#define _SYS_SPACE_MAP_H
@ -136,6 +140,8 @@ struct space_map_ops {
typedef void space_map_func_t(space_map_t *sm, uint64_t start, uint64_t size);
extern void space_map_init(void);
extern void space_map_fini(void);
extern void space_map_create(space_map_t *sm, uint64_t start, uint64_t size,
uint8_t shift, kmutex_t *lp);
extern void space_map_destroy(space_map_t *sm);

5
include/sys/zio_impl.h
View File

@ -23,6 +23,10 @@
* Use is subject to license terms.
*/
/*
* Copyright (c) 2012 by Delphix. All rights reserved.
*/
#ifndef _ZIO_IMPL_H
#define _ZIO_IMPL_H
@ -143,6 +147,7 @@ enum zio_stage {
#define ZIO_FREE_PIPELINE \
(ZIO_INTERLOCK_STAGES | \
ZIO_STAGE_FREE_BP_INIT | \
ZIO_STAGE_ISSUE_ASYNC | \
ZIO_STAGE_DVA_FREE)
#define ZIO_DDT_FREE_PIPELINE \

5
module/zfs/metaslab.c
View File

@ -899,8 +899,9 @@ metaslab_activate(metaslab_t *msp, uint64_t activation_weight)
if ((msp->ms_weight & METASLAB_ACTIVE_MASK) == 0) {
space_map_load_wait(sm);
if (!sm->sm_loaded) {
int error = space_map_load(sm, sm_ops, SM_FREE,
&msp->ms_smo,
space_map_obj_t *smo = &msp->ms_smo;
int error = space_map_load(sm, sm_ops, SM_FREE, smo,
spa_meta_objset(msp->ms_group->mg_vd->vdev_spa));
if (error) {
metaslab_group_sort(msp->ms_group, msp, 0);

2
module/zfs/spa.c
View File

@ -6078,7 +6078,7 @@ spa_sync(spa_t *spa, uint64_t txg)
spa_errlog_sync(spa, txg);
dsl_pool_sync(dp, txg);
if (pass <= SYNC_PASS_DEFERRED_FREE) {
if (pass < zfs_sync_pass_deferred_free) {
zio_t *zio = zio_root(spa, NULL, NULL, 0);
bplist_iterate(free_bpl, spa_free_sync_cb,
zio, tx);

2
module/zfs/spa_misc.c
View File

@ -1633,6 +1633,7 @@ spa_init(int mode)
fm_init();
refcount_init();
unique_init();
space_map_init();
zio_init();
dmu_init();
zil_init();
@ -1655,6 +1656,7 @@ spa_fini(void)
zil_fini();
dmu_fini();
zio_fini();
space_map_fini();
unique_fini();
refcount_fini();
fm_fini();

42
module/zfs/space_map.c
View File

@ -29,6 +29,23 @@
#include <sys/zio.h>
#include <sys/space_map.h>
static kmem_cache_t *space_seg_cache;
void
space_map_init(void)
{
ASSERT(space_seg_cache == NULL);
space_seg_cache = kmem_cache_create("space_seg_cache",
sizeof (space_seg_t), 0, NULL, NULL, NULL, NULL, NULL, 0);
}
void
space_map_fini(void)
{
kmem_cache_destroy(space_seg_cache);
space_seg_cache = NULL;
}
/*
* Space map routines.
* NOTE: caller is responsible for all locking.
@ -121,7 +138,7 @@ space_map_add(space_map_t *sm, uint64_t start, uint64_t size)
avl_remove(sm->sm_pp_root, ss_after);
}
ss_after->ss_start = ss_before->ss_start;
kmem_free(ss_before, sizeof (*ss_before));
kmem_cache_free(space_seg_cache, ss_before);
ss = ss_after;
} else if (merge_before) {
ss_before->ss_end = end;
@ -134,7 +151,7 @@ space_map_add(space_map_t *sm, uint64_t start, uint64_t size)
avl_remove(sm->sm_pp_root, ss_after);
ss = ss_after;
} else {
ss = kmem_alloc(sizeof (*ss), KM_PUSHPAGE);
ss = kmem_cache_alloc(space_seg_cache, KM_PUSHPAGE);
ss->ss_start = start;
ss->ss_end = end;
avl_insert(&sm->sm_root, ss, where);
@ -181,7 +198,7 @@ space_map_remove(space_map_t *sm, uint64_t start, uint64_t size)
avl_remove(sm->sm_pp_root, ss);
if (left_over && right_over) {
newseg = kmem_alloc(sizeof (*newseg), KM_PUSHPAGE);
newseg = kmem_cache_alloc(space_seg_cache, KM_PUSHPAGE);
newseg->ss_start = end;
newseg->ss_end = ss->ss_end;
ss->ss_end = start;
@ -194,7 +211,7 @@ space_map_remove(space_map_t *sm, uint64_t start, uint64_t size)
ss->ss_start = end;
} else {
avl_remove(&sm->sm_root, ss);
kmem_free(ss, sizeof (*ss));
kmem_cache_free(space_seg_cache, ss);
ss = NULL;
}
@ -234,7 +251,7 @@ space_map_vacate(space_map_t *sm, space_map_func_t *func, space_map_t *mdest)
while ((ss = avl_destroy_nodes(&sm->sm_root, &cookie)) != NULL) {
if (func != NULL)
func(mdest, ss->ss_start, ss->ss_end - ss->ss_start);
kmem_free(ss, sizeof (*ss));
kmem_cache_free(space_seg_cache, ss);
}
sm->sm_space = 0;
}
@ -406,7 +423,7 @@ space_map_sync(space_map_t *sm, uint8_t maptype,
spa_t *spa = dmu_objset_spa(os);
void *cookie = NULL;
space_seg_t *ss;
uint64_t bufsize, start, size, run_len;
uint64_t bufsize, start, size, run_len, delta, sm_space;
uint64_t *entry, *entry_map, *entry_map_end;
ASSERT(MUTEX_HELD(sm->sm_lock));
@ -435,11 +452,13 @@ space_map_sync(space_map_t *sm, uint8_t maptype,
SM_DEBUG_SYNCPASS_ENCODE(spa_sync_pass(spa)) |
SM_DEBUG_TXG_ENCODE(dmu_tx_get_txg(tx));
delta = 0;
sm_space = sm->sm_space;
while ((ss = avl_destroy_nodes(&sm->sm_root, &cookie)) != NULL) {
size = ss->ss_end - ss->ss_start;
start = (ss->ss_start - sm->sm_start) >> sm->sm_shift;
sm->sm_space -= size;
delta += size;
size >>= sm->sm_shift;
while (size) {
@ -461,7 +480,7 @@ space_map_sync(space_map_t *sm, uint8_t maptype,
start += run_len;
size -= run_len;
}
kmem_free(ss, sizeof (*ss));
kmem_cache_free(space_seg_cache, ss);
}
if (entry != entry_map) {
@ -473,8 +492,15 @@ space_map_sync(space_map_t *sm, uint8_t maptype,
smo->smo_objsize += size;
}
/*
* Ensure that the space_map's accounting wasn't changed
* while we were in the middle of writing it out.
*/
VERIFY3U(sm->sm_space, ==, sm_space);
zio_buf_free(entry_map, bufsize);
sm->sm_space -= delta;
VERIFY3U(sm->sm_space, ==, 0);
}

22
module/zfs/zio.c
View File

@ -84,6 +84,22 @@ extern vmem_t *zio_alloc_arena;
#endif
extern int zfs_mg_alloc_failures;
/*
* The following actions directly effect the spa's sync-to-convergence logic.
* The values below define the sync pass when we start performing the action.
* Care should be taken when changing these values as they directly impact
* spa_sync() performance. Tuning these values may introduce subtle performance
* pathologies and should only be done in the context of performance analysis.
* These tunables will eventually be removed and replaced with #defines once
* enough analysis has been done to determine optimal values.
*
* The 'zfs_sync_pass_deferred_free' pass must be greater than 1 to ensure that
* regular blocks are not deferred.
*/
int zfs_sync_pass_deferred_free = 2; /* defer frees starting in this pass */
int zfs_sync_pass_dont_compress = 5; /* don't compress starting in this pass */
int zfs_sync_pass_rewrite = 2; /* rewrite new bps starting in this pass */
/*
* An allocating zio is one that either currently has the DVA allocate
* stage set or will have it later in its lifetime.
@ -771,7 +787,7 @@ zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg, const blkptr_t *bp,
ASSERT(!BP_IS_HOLE(bp));
ASSERT(spa_syncing_txg(spa) == txg);
ASSERT(spa_sync_pass(spa) <= SYNC_PASS_DEFERRED_FREE);
ASSERT(spa_sync_pass(spa) < zfs_sync_pass_deferred_free);
zio = zio_create(pio, spa, txg, bp, NULL, BP_GET_PSIZE(bp),
NULL, NULL, ZIO_TYPE_FREE, ZIO_PRIORITY_FREE, flags,
@ -1068,7 +1084,7 @@ zio_write_bp_init(zio_t *zio)
ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL);
ASSERT(!BP_GET_DEDUP(bp));
if (pass > SYNC_PASS_DONT_COMPRESS)
if (pass >= zfs_sync_pass_dont_compress)
compress = ZIO_COMPRESS_OFF;
/* Make sure someone doesn't change their mind on overwrites */
@ -1097,7 +1113,7 @@ zio_write_bp_init(zio_t *zio)
* There should only be a handful of blocks after pass 1 in any case.
*/
if (bp->blk_birth == zio->io_txg && BP_GET_PSIZE(bp) == psize &&
pass > SYNC_PASS_REWRITE) {
pass >= zfs_sync_pass_rewrite) {
enum zio_stage gang_stages = zio->io_pipeline & ZIO_GANG_STAGES;
ASSERT(psize != 0);
zio->io_pipeline = ZIO_REWRITE_PIPELINE | gang_stages;