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4881 zfs send performance degradation when embedded block pointers are encountered

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Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Christopher Siden <christopher.siden@delphix.com>
Approved by: Dan McDonald <danmcd@omniti.com>

illumos/illumos-gate@06315b795c
This commit is contained in:
Xin LI 2014-06-17 07:46:55 +00:00
parent 0b5251374e
commit ce166ed6dd
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/vendor-sys/illumos/dist/; revision=267567
1 changed files with 20 additions and 15 deletions
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35
uts/common/fs/zfs/dmu_traverse.c
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@ -20,7 +20,7 @@
*/
/*
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2013 by Delphix. All rights reserved.
* Copyright (c) 2012, 2014 by Delphix. All rights reserved.
*/
#include <sys/zfs_context.h>
@ -197,6 +197,16 @@ traverse_prefetch_metadata(traverse_data_t *td,
ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb);
}
static boolean_t
prefetch_needed(prefetch_data_t *pfd, const blkptr_t *bp)
{
ASSERT(pfd->pd_flags & TRAVERSE_PREFETCH_DATA);
if (BP_IS_HOLE(bp) || BP_IS_EMBEDDED(bp) ||
BP_GET_TYPE(bp) == DMU_OT_INTENT_LOG)
return (B_FALSE);
return (B_TRUE);
}
static int
traverse_visitbp(traverse_data_t *td, const dnode_phys_t *dnp,
const blkptr_t *bp, const zbookmark_t *zb)
@ -242,16 +252,7 @@ traverse_visitbp(traverse_data_t *td, const dnode_phys_t *dnp,
return (0);
}
if (BP_IS_HOLE(bp)) {
err = td->td_func(td->td_spa, NULL, bp, zb, dnp, td->td_arg);
if (err != 0)
goto post;
return (0);
}
if (pd && !pd->pd_exited &&
((pd->pd_flags & TRAVERSE_PREFETCH_DATA) ||
BP_GET_TYPE(bp) == DMU_OT_DNODE || BP_GET_LEVEL(bp) > 0)) {
if (pd != NULL && !pd->pd_exited && prefetch_needed(pd, bp)) {
mutex_enter(&pd->pd_mtx);
ASSERT(pd->pd_blks_fetched >= 0);
while (pd->pd_blks_fetched == 0 && !pd->pd_exited)
@ -261,6 +262,13 @@ traverse_visitbp(traverse_data_t *td, const dnode_phys_t *dnp,
mutex_exit(&pd->pd_mtx);
}
if (BP_IS_HOLE(bp)) {
err = td->td_func(td->td_spa, NULL, bp, zb, dnp, td->td_arg);
if (err != 0)
goto post;
return (0);
}
if (td->td_flags & TRAVERSE_PRE) {
err = td->td_func(td->td_spa, NULL, bp, zb, dnp,
td->td_arg);
@ -444,10 +452,7 @@ traverse_prefetcher(spa_t *spa, zilog_t *zilog, const blkptr_t *bp,
if (pfd->pd_cancel)
return (SET_ERROR(EINTR));
if (BP_IS_HOLE(bp) || BP_IS_EMBEDDED(bp) ||
!((pfd->pd_flags & TRAVERSE_PREFETCH_DATA) ||
BP_GET_TYPE(bp) == DMU_OT_DNODE || BP_GET_LEVEL(bp) > 0) ||
BP_GET_TYPE(bp) == DMU_OT_INTENT_LOG)
if (!prefetch_needed(pfd, bp))
return (0);
mutex_enter(&pfd->pd_mtx);