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dm cache: wake the worker thread every time we free a migration object

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When the cache is idle, writeback work was only being issued every
second.  With this change outstanding writebacks are streamed
constantly.  This offers a writeback performance improvement.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Joe Thornber 2015-05-27 15:39:45 +01:00 committed by Mike Snitzer
parent 66a6363566
commit 88bf5184fa
1 changed files with 6 additions and 3 deletions
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9
drivers/md/dm-cache-target.c
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@ -418,10 +418,13 @@ static struct dm_cache_migration *alloc_migration(struct cache *cache)
static void free_migration(struct dm_cache_migration *mg)
{
if (atomic_dec_and_test(&mg->cache->nr_allocated_migrations))
wake_up(&mg->cache->migration_wait);
struct cache *cache = mg->cache;
mempool_free(mg, mg->cache->migration_pool);
if (atomic_dec_and_test(&cache->nr_allocated_migrations))
wake_up(&cache->migration_wait);
mempool_free(mg, cache->migration_pool);
wake_worker(cache);
}
static int prealloc_data_structs(struct cache *cache, struct prealloc *p)