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ddt: add support for prefetching tables into the ARC

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This change adds a new `zpool prefetch -t ddt $pool` command which
causes a pool's DDT to be loaded into the ARC. The primary goal is to
remove the need to "warm" a pool's cache before deduplication stops
slowing write performance. It may also provide a way to reload portions
of a DDT if they have been flushed due to inactivity.

Sponsored-by: iXsystems, Inc.
Sponsored-by: Catalogics, Inc.
Sponsored-by: Klara, Inc.
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Allan Jude <allan@klarasystems.com>
Signed-off-by: Will Andrews <will.andrews@klarasystems.com>
Signed-off-by: Fred Weigel <fred.weigel@klarasystems.com>
Signed-off-by: Rob Norris <rob.norris@klarasystems.com>
Signed-off-by: Don Brady <don.brady@klarasystems.com>
Co-authored-by: Will Andrews <will.andrews@klarasystems.com>
Co-authored-by: Don Brady <don.brady@klarasystems.com>
Closes #15890
This commit is contained in:
Allan Jude
2024-07-26 12:16:18 -04:00
committed by GitHub
parent 2ed1aebaf6
commit 62e7d3c89e
37 changed files with 1067 additions and 52 deletions
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include/libzfs_core.h
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@@ -148,6 +148,9 @@ _LIBZFS_CORE_H int lzc_pool_checkpoint_discard(const char *);
_LIBZFS_CORE_H int lzc_wait(const char *, zpool_wait_activity_t, boolean_t *);
_LIBZFS_CORE_H int lzc_wait_tag(const char *, zpool_wait_activity_t, uint64_t,
boolean_t *);
_LIBZFS_CORE_H int lzc_pool_prefetch(const char *, zpool_prefetch_type_t);
_LIBZFS_CORE_H int lzc_wait_fs(const char *, zfs_wait_activity_t, boolean_t *);
_LIBZFS_CORE_H int lzc_set_bootenv(const char *, const nvlist_t *);