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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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cmd/ztest.c
+18
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@@ -26,6 +26,7 @@
* Copyright (c) 2014 Integros [integros.com]
* Copyright 2017 Joyent, Inc.
* Copyright (c) 2017, Intel Corporation.
* Copyright (c) 2023, Klara, Inc.
*/
/*
@@ -444,6 +445,7 @@ ztest_func_t ztest_blake3;
ztest_func_t ztest_fletcher;
ztest_func_t ztest_fletcher_incr;
ztest_func_t ztest_verify_dnode_bt;
ztest_func_t ztest_pool_prefetch_ddt;
static uint64_t zopt_always = 0ULL * NANOSEC; /* all the time */
static uint64_t zopt_incessant = 1ULL * NANOSEC / 10; /* every 1/10 second */
@@ -499,6 +501,7 @@ static ztest_info_t ztest_info[] = {
ZTI_INIT(ztest_fletcher, 1, &zopt_rarely),
ZTI_INIT(ztest_fletcher_incr, 1, &zopt_rarely),
ZTI_INIT(ztest_verify_dnode_bt, 1, &zopt_sometimes),
ZTI_INIT(ztest_pool_prefetch_ddt, 1, &zopt_rarely),
};
#define ZTEST_FUNCS (sizeof (ztest_info) / sizeof (ztest_info_t))
@@ -6993,6 +6996,21 @@ ztest_fletcher_incr(ztest_ds_t *zd, uint64_t id)
}
}
void
ztest_pool_prefetch_ddt(ztest_ds_t *zd, uint64_t id)
{
(void) zd, (void) id;
spa_t *spa;
(void) pthread_rwlock_rdlock(&ztest_name_lock);
VERIFY0(spa_open(ztest_opts.zo_pool, &spa, FTAG));
ddt_prefetch_all(spa);
spa_close(spa, FTAG);
(void) pthread_rwlock_unlock(&ztest_name_lock);
}
static int
ztest_set_global_vars(void)
{