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Avoid updating the L2ARC device header unnecessarily

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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.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: George Amanakis <gamanakis@gmail.com>
Closes #11522 
Closes #11537
This commit is contained in:
George Amanakis 2021-01-28 18:20:03 +01:00 committed by GitHub
parent 416015ef54
commit 0ae184a6ba
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 3 additions and 1 deletions
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4
module/zfs/arc.c
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@ -9068,6 +9068,7 @@ 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);
@ -9299,7 +9300,8 @@ 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);
}