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Selectable block allocators

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ZFS historically has had several space allocators that were
dynamically selectable.  While these have been retained in 
OpenZFS, only a single allocator has been statically compiled 
in. This patch compiles all allocators for OpenZFS and provides 
a module parameter to allow for manual selection between them.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Ameer Hamza <ahamza@ixsystems.com>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Signed-off-by: Edmund Nadolski <edmund.nadolski@ixsystems.com>
Closes #15218
This commit is contained in:
ednadolski-ix
2023-09-01 19:00:30 -06:00
committed by GitHub
parent 71472bf375
commit 95f71c019d
9 changed files with 127 additions and 31 deletions
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module/zfs/spa_misc.c
+6
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@@ -389,6 +389,11 @@ static const uint64_t spa_min_slop = 128ULL * 1024 * 1024;
static const uint64_t spa_max_slop = 128ULL * 1024 * 1024 * 1024;
static const int spa_allocators = 4;
/*
* Spa active allocator.
* Valid values are zfs_active_allocator=<dynamic|cursor|new-dynamic>.
*/
const char *zfs_active_allocator = "dynamic";
void
spa_load_failed(spa_t *spa, const char *fmt, ...)
@@ -710,6 +715,7 @@ spa_add(const char *name, nvlist_t *config, const char *altroot)
spa->spa_deadman_synctime = MSEC2NSEC(zfs_deadman_synctime_ms);
spa->spa_deadman_ziotime = MSEC2NSEC(zfs_deadman_ziotime_ms);
spa_set_deadman_failmode(spa, zfs_deadman_failmode);
spa_set_allocator(spa, zfs_active_allocator);
zfs_refcount_create(&spa->spa_refcount);
spa_config_lock_init(spa);