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Commit 88bf5184 authored by Joe Thornber's avatar Joe Thornber Committed by Mike Snitzer
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dm cache: wake the worker thread every time we free a migration object 



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: default avatarJoe Thornber <ejt@redhat.com>
Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
parent 66a63635

drivers/md/dm-cache-target.c

+6 −3
Original line number Diff line number Diff line
@@ -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;



	if (atomic_dec_and_test(&cache->nr_allocated_migrations))

		wake_up(&cache->migration_wait);



	mempool_free(mg, mg->cache->migration_pool);

	mempool_free(mg, cache->migration_pool);

	wake_worker(cache);

}



static int prealloc_data_structs(struct cache *cache, struct prealloc *p)