The branch stable/13 has been updated by mm:
URL:
https://cgit.FreeBSD.org/src/commit/?id=edb9049c3a782a51a77bd81a478c28cd1745323c
commit edb9049c3a782a51a77bd81a478c28cd1745323c
Author: Martin Matuska <m...@freebsd.org>
AuthorDate: 2021-02-15 08:10:01 +0000
Commit: Martin Matuska <m...@freebsd.org>
CommitDate: 2021-02-18 01:29:46 +0000
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 <gamana...@gmail.com>
Reviewed by: delphij
Differential Revision: https://reviews.freebsd.org/D28682
(cherry picked from commit 5dce03847fdc7bc6eb959282c0ae2117b1991746)
---
sys/contrib/openzfs/module/zfs/arc.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
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);
}
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