[dm-devel] [PATCH 18/24] dm cache: optimize commit_if_needed

[Mike Snitzer]

From: Heinz Mauelshagen <heinzm at redhat.com>

Check commit_requested flag _before_ calling
dm_cache_changed_this_transaction() superfluously.

Signed-off-by: Heinz Mauelshagen <heinzm at redhat.com>
Signed-off-by: Mike Snitzer <snitzer at redhat.com>
---
 drivers/md/dm-cache-target.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c
index f999ddd..502ae64 100644
--- a/drivers/md/dm-cache-target.c
+++ b/drivers/md/dm-cache-target.c
@@ -1324,8 +1324,8 @@ static int need_commit_due_to_time(struct cache *cache)
 
 static int commit_if_needed(struct cache *cache)
 {
-	if (dm_cache_changed_this_transaction(cache->cmd) &&
-	    (cache->commit_requested || need_commit_due_to_time(cache))) {
+	if ((cache->commit_requested || need_commit_due_to_time(cache)) &&
+	    dm_cache_changed_this_transaction(cache->cmd)) {
 		atomic_inc(&cache->stats.commit_count);
 		cache->last_commit_jiffies = jiffies;
 		cache->commit_requested = false;
-- 
1.8.1.4