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| author | Martin Matuska <mm@FreeBSD.org> | 2021-02-15 08:10:01 +0000 |
|---|---|---|
| committer | Martin Matuska <mm@FreeBSD.org> | 2021-02-18 01:29:46 +0000 |
| commit | edb9049c3a782a51a77bd81a478c28cd1745323c (patch) | |
| tree | 9e3c60d6f4080243868ce1b7468a362574a94442 | |
| parent | 6f21b7996a95b7d93d1687787b55e57289689066 (diff) | |
| download | src-edb9049c3a782a51a77bd81a478c28cd1745323c.tar.gz src-edb9049c3a782a51a77bd81a478c28cd1745323c.zip | |
zfs: Avoid updating the L2ARC device header unnecessarily
From openzfs-master 0ae184a6b commit message:
If we do not write any buffers to the cache device and the evict hand
has not advanced do not update the cache device header.
Cherry-picked from openzfs 0ae184a6baaf71e155e9b19af81b75474622ff58
Patch Author: George Amanakis <gamanakis@gmail.com>
Reviewed by: delphij
Differential Revision: https://reviews.freebsd.org/D28682
(cherry picked from commit 5dce03847fdc7bc6eb959282c0ae2117b1991746)
| -rw-r--r-- | sys/contrib/openzfs/module/zfs/arc.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/sys/contrib/openzfs/module/zfs/arc.c b/sys/contrib/openzfs/module/zfs/arc.c index e05b11d51942..fecc752e16ff 100644 --- a/sys/contrib/openzfs/module/zfs/arc.c +++ b/sys/contrib/openzfs/module/zfs/arc.c @@ -9062,6 +9062,7 @@ l2arc_write_buffers(spa_t *spa, l2arc_dev_t *dev, uint64_t target_sz) l2arc_write_callback_t *cb = NULL; zio_t *pio, *wzio; uint64_t guid = spa_load_guid(spa); + l2arc_dev_hdr_phys_t *l2dhdr = dev->l2ad_dev_hdr; ASSERT3P(dev->l2ad_vdev, !=, NULL); @@ -9293,7 +9294,8 @@ l2arc_write_buffers(spa_t *spa, l2arc_dev_t *dev, uint64_t target_sz) * Although we did not write any buffers l2ad_evict may * have advanced. */ - l2arc_dev_hdr_update(dev); + if (dev->l2ad_evict != l2dhdr->dh_evict) + l2arc_dev_hdr_update(dev); return (0); } |