From ffcbcb6720ab6a4bb6e0a51b3711e8c60872d281 Mon Sep 17 00:00:00 2001 From: Heinz Mauelshagen Date: Mon, 14 Oct 2013 17:24:43 +0200 Subject: [PATCH] dm cache: optimize commit_if_needed Check commit_requested flag _before_ calling dm_cache_changed_this_transaction() superfluously. Also, be sure to set last_commit_jiffies _after_ dm_cache_commit() completes. Signed-off-by: Heinz Mauelshagen Signed-off-by: Joe Thornber Signed-off-by: Mike Snitzer --- drivers/md/dm-cache-target.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c index 05a10c02043f..4b564069e08f 100644 --- a/drivers/md/dm-cache-target.c +++ b/drivers/md/dm-cache-target.c @@ -1234,15 +1234,17 @@ 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))) { + int r = 0; + + 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; - return dm_cache_commit(cache->cmd, false); + r = dm_cache_commit(cache->cmd, false); + cache->last_commit_jiffies = jiffies; } - return 0; + return r; } static void process_deferred_bios(struct cache *cache) -- 2.39.5