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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-cache-target.c
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@ -95,7 +95,6 @@ static void dm_unhook_bio(struct dm_hook_info *h, struct bio *bio)
/*----------------------------------------------------------------*/
#define PRISON_CELLS 1024
#define MIGRATION_POOL_SIZE 128
#define COMMIT_PERIOD HZ
#define MIGRATION_COUNT_WINDOW 10
@ -2327,7 +2326,7 @@ static int cache_create(struct cache_args *ca, struct cache **result)
INIT_DELAYED_WORK(&cache->waker, do_waker);
cache->last_commit_jiffies = jiffies;
cache->prison = dm_bio_prison_create(PRISON_CELLS);
cache->prison = dm_bio_prison_create();
if (!cache->prison) {
*error = "could not create bio prison";
goto bad;