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Code cleanups

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- Allocate ve_search on the stack, so we avoid allocating memory for
  every I/O even if the VDEV cache is disabled.
- Reduce lock scope.
- Avoid locking in vdev_cache_read() when the VDEV cache is disabled.
- Sort file names properly.
- Correct comment.

Reviewed-by: Allan Jude <allan@klarasystems.com>
Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Reviewed-by: Matthew Ahrens <mahrens@delphix.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Pawel Jakub Dawidek <pawel@dawidek.net>
Closes #12749
This commit is contained in:
Pawel Jakub Dawidek
2021-11-30 10:32:38 -08:00
committed by GitHub
parent cfc62062ae
commit 547df81641
5 changed files with 19 additions and 18 deletions
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module/zfs/vdev_cache.c
+6 -5
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@@ -251,13 +251,16 @@ boolean_t
vdev_cache_read(zio_t *zio)
{
vdev_cache_t *vc = &zio->io_vd->vdev_cache;
vdev_cache_entry_t *ve, *ve_search;
vdev_cache_entry_t *ve, ve_search;
uint64_t cache_offset = P2ALIGN(zio->io_offset, VCBS);
zio_t *fio;
uint64_t cache_phase __maybe_unused = P2PHASE(zio->io_offset, VCBS);
ASSERT3U(zio->io_type, ==, ZIO_TYPE_READ);
if (zfs_vdev_cache_size == 0)
return (B_FALSE);
if (zio->io_flags & ZIO_FLAG_DONT_CACHE)
return (B_FALSE);
@@ -274,10 +277,8 @@ vdev_cache_read(zio_t *zio)
mutex_enter(&vc->vc_lock);
ve_search = kmem_alloc(sizeof (vdev_cache_entry_t), KM_SLEEP);
ve_search->ve_offset = cache_offset;
ve = avl_find(&vc->vc_offset_tree, ve_search, NULL);
kmem_free(ve_search, sizeof (vdev_cache_entry_t));
ve_search.ve_offset = cache_offset;
ve = avl_find(&vc->vc_offset_tree, &ve_search, NULL);
if (ve != NULL) {
if (ve->ve_missed_update) {