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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/sys/ddt.h
+3 -1
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@@ -236,6 +236,7 @@ extern void ddt_get_dedup_stats(spa_t *spa, ddt_stat_t *dds_total);
extern uint64_t ddt_get_dedup_dspace(spa_t *spa);
extern uint64_t ddt_get_pool_dedup_ratio(spa_t *spa);
extern int ddt_get_pool_dedup_cached(spa_t *spa, uint64_t *psize);
extern ddt_t *ddt_select(spa_t *spa, const blkptr_t *bp);
extern void ddt_enter(ddt_t *ddt);
@@ -243,8 +244,9 @@ extern void ddt_exit(ddt_t *ddt);
extern void ddt_init(void);
extern void ddt_fini(void);
extern ddt_entry_t *ddt_lookup(ddt_t *ddt, const blkptr_t *bp, boolean_t add);
extern void ddt_prefetch(spa_t *spa, const blkptr_t *bp);
extern void ddt_remove(ddt_t *ddt, ddt_entry_t *dde);
extern void ddt_prefetch(spa_t *spa, const blkptr_t *bp);
extern void ddt_prefetch_all(spa_t *spa);
extern boolean_t ddt_class_contains(spa_t *spa, ddt_class_t max_class,
const blkptr_t *bp);