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| author | Joe Thornber <ejt@redhat.com> | 2023-03-29 16:29:34 +0200 |
|---|---|---|
| committer | Mike Snitzer <snitzer@kernel.org> | 2023-03-30 21:57:51 +0200 |
| commit | 363b7fd76c91dc611a56d992e9550bb1ba070e1a (patch) | |
| tree | a8871fafe3b50344d8ff12a4fc7403cfdfd9772a /drivers/md/dm-bufio.c | |
| parent | dm bio prison v1: intelligently size dm_bio_prison's prison_regions (diff) | |
| download | linux-363b7fd76c91dc611a56d992e9550bb1ba070e1a.tar.xz linux-363b7fd76c91dc611a56d992e9550bb1ba070e1a.zip | |
dm: improve hash_locks sizing and hash function
Both bufio and bio-prison-v1 use the identical model for splitting
their respective locks and rbtrees. Improve dm_num_hash_locks() to
distribute across more rbtrees to improve overall performance -- but
the maximum number of locks/rbtrees is still 64.
Also factor out a common hash function named dm_hash_locks_index(),
the magic numbers used were determined to be best using this program:
https://gist.github.com/jthornber/e05c47daa7b500c56dc339269c5467fc
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Diffstat (limited to 'drivers/md/dm-bufio.c')
| -rw-r--r-- | drivers/md/dm-bufio.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/md/dm-bufio.c b/drivers/md/dm-bufio.c index c1126ad45bdb..8a448185662c 100644 --- a/drivers/md/dm-bufio.c +++ b/drivers/md/dm-bufio.c @@ -398,7 +398,7 @@ struct dm_buffer_cache { static inline unsigned int cache_index(sector_t block, unsigned int num_locks) { - return block & (num_locks - 1); + return dm_hash_locks_index(block, num_locks); } static inline void cache_read_lock(struct dm_buffer_cache *bc, sector_t block) |