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authorJoe Thornber <ejt@redhat.com>2014-10-06 16:30:06 -0400
committerMike Snitzer <snitzer@redhat.com>2014-11-10 15:25:26 -0500
commita195db2d29a47c2c3a61386009bd400df18c86cf (patch)
tree17f9c41a52fa28c6a03840a0df24a3781c280217 /drivers/md/dm-thin.c
parent33096a7822de63bc7dbdd090870b656a0304fa35 (diff)
downloadlinux-a195db2d29a47c2c3a61386009bd400df18c86cf.tar.gz
dm bio prison: switch to using a red black tree
Previously it was using a fixed sized hash table. There are times when very many concurrent cells are held (such as when processing a very large discard). When this happens the hash table performance becomes very poor. Signed-off-by: Joe Thornber <ejt@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md/dm-thin.c')
-rw-r--r--drivers/md/dm-thin.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c
index 0f86d802b533..eecfe7495232 100644
--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -25,7 +25,6 @@
*/
#define ENDIO_HOOK_POOL_SIZE 1024
#define MAPPING_POOL_SIZE 1024
-#define PRISON_CELLS 1024
#define COMMIT_PERIOD HZ
#define NO_SPACE_TIMEOUT_SECS 60
@@ -2193,7 +2192,7 @@ static struct pool *pool_create(struct mapped_device *pool_md,
pool->sectors_per_block_shift = __ffs(block_size);
pool->low_water_blocks = 0;
pool_features_init(&pool->pf);
- pool->prison = dm_bio_prison_create(PRISON_CELLS);
+ pool->prison = dm_bio_prison_create();
if (!pool->prison) {
*error = "Error creating pool's bio prison";
err_p = ERR_PTR(-ENOMEM);