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dm bio prison: switch to using a red black tree

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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>
This commit is contained in:
Joe Thornber
2014-10-06 16:30:06 -04:00
committed by Mike Snitzer
parent 33096a7822
commit a195db2d29
4 changed files with 84 additions and 111 deletions
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3
drivers/md/dm-thin.c
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@@ -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);