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Persistent L2ARC

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This commit makes the L2ARC persistent across reboots. We implement
a light-weight persistent L2ARC metadata structure that allows L2ARC
contents to be recovered after a reboot. This significantly eases the
impact a reboot has on read performance on systems with large caches.

Reviewed-by: Matthew Ahrens <mahrens@delphix.com>
Reviewed-by: George Wilson <gwilson@delphix.com>
Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Co-authored-by: Saso Kiselkov <skiselkov@gmail.com>
Co-authored-by: Jorgen Lundman <lundman@lundman.net>
Co-authored-by: George Amanakis <gamanakis@gmail.com>
Ported-by: Yuxuan Shui <yshuiv7@gmail.com>
Signed-off-by: George Amanakis <gamanakis@gmail.com>
Closes #925 
Closes #1823 
Closes #2672 
Closes #3744 
Closes #9582
This commit is contained in:
George Amanakis
2020-04-10 13:33:35 -04:00
committed by GitHub
parent 36a6e2335c
commit 77f6826b83
30 changed files with 3020 additions and 88 deletions
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module/zfs/arc.c
+1384 -46
View File
File diff suppressed because it is too large Load Diff
module/zfs/spa.c
+13
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@@ -4860,6 +4860,8 @@ spa_load_impl(spa_t *spa, spa_import_type_t type, char **ereport)
}
spa_import_progress_remove(spa_guid(spa));
spa_async_request(spa, SPA_ASYNC_L2CACHE_REBUILD);
spa_load_note(spa, "LOADED");
return (0);
@@ -7985,6 +7987,17 @@ spa_async_thread(void *arg)
mutex_exit(&spa_namespace_lock);
}
/*
* Kick off L2 cache rebuilding.
*/
if (tasks & SPA_ASYNC_L2CACHE_REBUILD) {
mutex_enter(&spa_namespace_lock);
spa_config_enter(spa, SCL_L2ARC, FTAG, RW_READER);
l2arc_spa_rebuild_start(spa);
spa_config_exit(spa, SCL_L2ARC, FTAG);
mutex_exit(&spa_namespace_lock);
}
/*
* Let the world know that we're done.
*/
module/zfs/vdev.c
+16 -3
View File
@@ -2279,9 +2279,22 @@ vdev_reopen(vdev_t *vd)
if (vd->vdev_aux) {
(void) vdev_validate_aux(vd);
if (vdev_readable(vd) && vdev_writeable(vd) &&
vd->vdev_aux == &spa->spa_l2cache &&
!l2arc_vdev_present(vd))
l2arc_add_vdev(spa, vd);
vd->vdev_aux == &spa->spa_l2cache) {
/*
* When reopening we can assume the device label has
* already the attribute l2cache_persistent, since we've
* opened the device in the past and updated the label.
* In case the vdev is present we should evict all ARC
* buffers and pointers to log blocks and reclaim their
* space before restoring its contents to L2ARC.
*/
if (l2arc_vdev_present(vd)) {
l2arc_rebuild_vdev(vd, B_TRUE);
} else {
l2arc_add_vdev(spa, vd);
}
spa_async_request(spa, SPA_ASYNC_L2CACHE_REBUILD);
}
} else {
(void) vdev_validate(vd);
}