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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
Download Patch File Download Diff File Expand all files Collapse all files
module/zfs/zap_micro.c
+16
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@@ -1072,6 +1072,21 @@ zap_prefetch(objset_t *os, uint64_t zapobj, const char *name)
return (err);
}
int
zap_prefetch_object(objset_t *os, uint64_t zapobj)
{
int error;
dmu_object_info_t doi;
error = dmu_object_info(os, zapobj, &doi);
if (error == 0 && DMU_OT_BYTESWAP(doi.doi_type) != DMU_BSWAP_ZAP)
error = SET_ERROR(EINVAL);
if (error == 0)
dmu_prefetch_wait(os, zapobj, 0, doi.doi_max_offset);
return (error);
}
int
zap_lookup_by_dnode(dnode_t *dn, const char *name,
uint64_t integer_size, uint64_t num_integers, void *buf)
@@ -1784,6 +1799,7 @@ EXPORT_SYMBOL(zap_lookup_uint64);
EXPORT_SYMBOL(zap_contains);
EXPORT_SYMBOL(zap_prefetch);
EXPORT_SYMBOL(zap_prefetch_uint64);
EXPORT_SYMBOL(zap_prefetch_object);
EXPORT_SYMBOL(zap_add);
EXPORT_SYMBOL(zap_add_by_dnode);
EXPORT_SYMBOL(zap_add_uint64);