From f1afb36a6102b52949c2c6d8eb250eddcce3fc5f Mon Sep 17 00:00:00 2001 From: Mike Snitzer Date: Thu, 30 Oct 2014 10:02:01 -0400 Subject: dm cache policy mq: simplify ability to promote sequential IO to the cache Before, if the user wanted sequential IO to be promoted to the cache they'd have to set sequential_threshold to some nebulous large value. Now, the user may easily disable sequential IO detection (and sequential IO's implicit bypass of the cache) by setting sequential_threshold to 0. Signed-off-by: Mike Snitzer --- drivers/md/dm-cache-policy-mq.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) (limited to 'drivers') diff --git a/drivers/md/dm-cache-policy-mq.c b/drivers/md/dm-cache-policy-mq.c index 334d098d720d..13f547a4eeb6 100644 --- a/drivers/md/dm-cache-policy-mq.c +++ b/drivers/md/dm-cache-policy-mq.c @@ -865,7 +865,8 @@ static int map(struct mq_policy *mq, dm_oblock_t oblock, if (e && in_cache(mq, e)) r = cache_entry_found(mq, e, result); - else if (iot_pattern(&mq->tracker) == PATTERN_SEQUENTIAL) + else if (mq->tracker.thresholds[PATTERN_SEQUENTIAL] && + iot_pattern(&mq->tracker) == PATTERN_SEQUENTIAL) result->op = POLICY_MISS; else if (e) @@ -1290,7 +1291,7 @@ bad_pre_cache_init: static struct dm_cache_policy_type mq_policy_type = { .name = "mq", - .version = {1, 2, 0}, + .version = {1, 3, 0}, .hint_size = 4, .owner = THIS_MODULE, .create = mq_create @@ -1298,7 +1299,7 @@ static struct dm_cache_policy_type mq_policy_type = { static struct dm_cache_policy_type default_policy_type = { .name = "default", - .version = {1, 2, 0}, + .version = {1, 3, 0}, .hint_size = 4, .owner = THIS_MODULE, .create = mq_create, -- cgit v1.2.3