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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/dmu.h
+8
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@@ -505,6 +505,12 @@ void dmu_object_set_checksum(objset_t *os, uint64_t object, uint8_t checksum,
void dmu_object_set_compress(objset_t *os, uint64_t object, uint8_t compress,
dmu_tx_t *tx);
/*
* Get an estimated cache size for an object. Caller must expect races.
*/
int dmu_object_cached_size(objset_t *os, uint64_t object,
uint64_t *l1sz, uint64_t *l2sz);
void dmu_write_embedded(objset_t *os, uint64_t object, uint64_t offset,
void *data, uint8_t etype, uint8_t comp, int uncompressed_size,
int compressed_size, int byteorder, dmu_tx_t *tx);
@@ -903,6 +909,8 @@ void dmu_prefetch(objset_t *os, uint64_t object, int64_t level, uint64_t offset,
void dmu_prefetch_by_dnode(dnode_t *dn, int64_t level, uint64_t offset,
uint64_t len, enum zio_priority pri);
void dmu_prefetch_dnode(objset_t *os, uint64_t object, enum zio_priority pri);
int dmu_prefetch_wait(objset_t *os, uint64_t object, uint64_t offset,
uint64_t size);
typedef struct dmu_object_info {
/* All sizes are in bytes unless otherwise indicated. */