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Illumos 4881 - zfs send performance regression with embedded data

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4881 zfs send performance degradation when embedded block pointers
     are encountered

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

References:
  https://www.illumos.org/issues/4881
  https://github.com/illumos/illumos-gate/commit/06315b7

Ported by: Tim Chase <tim@chase2k.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #2547
This commit is contained in:
Matthew Ahrens 2014-06-05 13:34:21 -08:00 committed by Brian Behlendorf
parent 3bec585e6c
commit 1fa8f795d5
1 changed files with 21 additions and 15 deletions
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36
module/zfs/dmu_traverse.c
View File

@ -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)
@ -239,16 +249,8 @@ 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 (td->td_pfd && !td->td_pfd->pd_exited &&
((td->td_pfd->pd_flags & TRAVERSE_PREFETCH_DATA) ||
BP_GET_TYPE(bp) == DMU_OT_DNODE || BP_GET_LEVEL(bp) > 0)) {
if (td->td_pfd != NULL && !td->td_pfd->pd_exited &&
prefetch_needed(td->td_pfd, bp)) {
mutex_enter(&td->td_pfd->pd_mtx);
ASSERT(td->td_pfd->pd_blks_fetched >= 0);
while (td->td_pfd->pd_blks_fetched == 0 &&
@ -259,6 +261,13 @@ traverse_visitbp(traverse_data_t *td, const dnode_phys_t *dnp,
mutex_exit(&td->td_pfd->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);
@ -448,10 +457,7 @@ 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);