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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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include/sys/dbuf.h
+3 -1
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@@ -294,6 +294,8 @@ typedef struct dmu_buf_impl {
/* Tells us which dbuf cache this dbuf is in, if any */
dbuf_cached_state_t db_caching_status;
uint64_t db_hash;
/* Data which is unique to data (leaf) blocks: */
/* User callback information. */
@@ -364,7 +366,7 @@ void dbuf_rele_and_unlock(dmu_buf_impl_t *db, const void *tag,
boolean_t evicting);
dmu_buf_impl_t *dbuf_find(struct objset *os, uint64_t object, uint8_t level,
uint64_t blkid);
uint64_t blkid, uint64_t *hash_out);
int dbuf_read(dmu_buf_impl_t *db, zio_t *zio, uint32_t flags);
void dmu_buf_will_not_fill(dmu_buf_t *db, dmu_tx_t *tx);