diff options
| author | Richard Yao <[email protected]> | 2022-12-13 20:29:21 -0500 |
|---|---|---|
| committer | GitHub <[email protected]> | 2022-12-13 17:29:21 -0800 |
| commit | 3236c0b891d0a09475bef8b6186ac8beed792fe9 (patch) | |
| tree | 03c7049b8548301ef8830fc2a2141afa8aa7a3c4 /include/sys/dbuf.h | |
| parent | dc95911d21a19930848302aac9283fff68e4a41b (diff) | |
Cache dbuf_hash() calculation
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 <[email protected]>
Reviewed-by: Matthew Ahrens <[email protected]>
Signed-off-by: Richard Yao <[email protected]>
Closes #14251
Diffstat (limited to 'include/sys/dbuf.h')
| -rw-r--r-- | include/sys/dbuf.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/include/sys/dbuf.h b/include/sys/dbuf.h index 9ba46f0d7..6215a2c12 100644 --- a/include/sys/dbuf.h +++ b/include/sys/dbuf.h @@ -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); |