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Cache dbuf_hash() calculation

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We currently compute a 64-bit hash three times, which consumes 0.8% CPU
time on ARC eviction heavy workloads. Caching the 64-bit value in the
dbuf allows us to avoid that overhead.

Sponsored-By: Wasabi Technology, Inc.
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Matthew Ahrens <mahrens@delphix.com>
Signed-off-by: Richard Yao <richard.yao@klarasystems.com>
Closes #14251
This commit is contained in:
Richard Yao
2022-12-13 20:29:21 -05:00
committed by GitHub
parent dc95911d21
commit 3236c0b891
3 changed files with 27 additions and 18 deletions
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module/zfs/dnode_sync.c
+2 -2
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@@ -70,8 +70,8 @@ dnode_increase_indirection(dnode_t *dn, dmu_tx_t *tx)
dmu_buf_impl_t *children[DN_MAX_NBLKPTR];
ASSERT3U(nblkptr, <=, DN_MAX_NBLKPTR);
for (i = 0; i < nblkptr; i++) {
children[i] =
dbuf_find(dn->dn_objset, dn->dn_object, old_toplvl, i);
children[i] = dbuf_find(dn->dn_objset, dn->dn_object,
old_toplvl, i, NULL);
}
/* transfer dnode's block pointers to new indirect block */