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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.c
+8 -6
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@@ -1295,24 +1295,26 @@ spa_thread(void *arg)
}
#endif
extern metaslab_ops_t *metaslab_allocator(spa_t *spa);
/*
* Activate an uninitialized pool.
*/
static void
spa_activate(spa_t *spa, spa_mode_t mode)
{
metaslab_ops_t *msp = metaslab_allocator(spa);
ASSERT(spa->spa_state == POOL_STATE_UNINITIALIZED);
spa->spa_state = POOL_STATE_ACTIVE;
spa->spa_mode = mode;
spa->spa_read_spacemaps = spa_mode_readable_spacemaps;
spa->spa_normal_class = metaslab_class_create(spa, &zfs_metaslab_ops);
spa->spa_log_class = metaslab_class_create(spa, &zfs_metaslab_ops);
spa->spa_embedded_log_class =
metaslab_class_create(spa, &zfs_metaslab_ops);
spa->spa_special_class = metaslab_class_create(spa, &zfs_metaslab_ops);
spa->spa_dedup_class = metaslab_class_create(spa, &zfs_metaslab_ops);
spa->spa_normal_class = metaslab_class_create(spa, msp);
spa->spa_log_class = metaslab_class_create(spa, msp);
spa->spa_embedded_log_class = metaslab_class_create(spa, msp);
spa->spa_special_class = metaslab_class_create(spa, msp);
spa->spa_dedup_class = metaslab_class_create(spa, msp);
/* Try to create a covering process */
mutex_enter(&spa->spa_proc_lock);