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authorJoe Thornber <ejt@redhat.com>2015-05-27 15:39:45 +0100
committerMike Snitzer <snitzer@redhat.com>2015-06-11 17:13:00 -0400
commit88bf5184fa5861e766e39fd34fc6d21557ac7be8 (patch)
tree5cbb1ffbcc0b8e7f648f2b65e93b834cb1a02b8b /drivers/md
parent66a636356647a9be8885c2ce2948de126577698a (diff)
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: Joe Thornber <ejt@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/dm-cache-target.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c
index 7829d947ef01..6d36ed3c46a0 100644
--- a/drivers/md/dm-cache-target.c
+++ b/drivers/md/dm-cache-target.c
@@ -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)