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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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include/sys/spa.h
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@@ -787,6 +787,7 @@ extern int bpobj_enqueue_free_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx);
#define SPA_ASYNC_INITIALIZE_RESTART 0x100
#define SPA_ASYNC_TRIM_RESTART 0x200
#define SPA_ASYNC_AUTOTRIM_RESTART 0x400
#define SPA_ASYNC_L2CACHE_REBUILD 0x800
/*
* Controls the behavior of spa_vdev_remove().