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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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module/zfs/spa.c
+55 -4
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@@ -34,7 +34,7 @@
* Copyright (c) 2017, Intel Corporation.
* Copyright (c) 2021, Colm Buckley <colm@tuatha.org>
* Copyright (c) 2023 Hewlett Packard Enterprise Development LP.
* Copyright (c) 2024, Klara Inc.
* Copyright (c) 2023, 2024, Klara Inc.
*/
/*
@@ -337,6 +337,55 @@ spa_prop_add_list(nvlist_t *nvl, zpool_prop_t prop, const char *strval,
nvlist_free(propval);
}
static int
spa_prop_add(spa_t *spa, const char *propname, nvlist_t *outnvl)
{
zpool_prop_t prop = zpool_name_to_prop(propname);
zprop_source_t src = ZPROP_SRC_NONE;
uint64_t intval;
int err;
/*
* NB: Not all properties lookups via this API require
* the spa props lock, so they must explicitly grab it here.
*/
switch (prop) {
case ZPOOL_PROP_DEDUPCACHED:
err = ddt_get_pool_dedup_cached(spa, &intval);
if (err != 0)
return (SET_ERROR(err));
break;
default:
return (SET_ERROR(EINVAL));
}
spa_prop_add_list(outnvl, prop, NULL, intval, src);
return (0);
}
int
spa_prop_get_nvlist(spa_t *spa, char **props, unsigned int n_props,
nvlist_t **outnvl)
{
int err = 0;
if (props == NULL)
return (0);
if (*outnvl == NULL) {
err = nvlist_alloc(outnvl, NV_UNIQUE_NAME, KM_SLEEP);
if (err)
return (err);
}
for (unsigned int i = 0; i < n_props && err == 0; i++) {
err = spa_prop_add(spa, props[i], *outnvl);
}
return (err);
}
/*
* Add a user property (source=src, propname=propval) to an nvlist.
*/
@@ -503,9 +552,11 @@ spa_prop_get(spa_t *spa, nvlist_t **nvp)
dsl_pool_t *dp;
int err;
err = nvlist_alloc(nvp, NV_UNIQUE_NAME, KM_SLEEP);
if (err)
return (err);
if (*nvp == NULL) {
err = nvlist_alloc(nvp, NV_UNIQUE_NAME, KM_SLEEP);
if (err)
return (err);
}
dp = spa_get_dsl(spa);
dsl_pool_config_enter(dp, FTAG);