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authorMike Snitzer <snitzer@redhat.com>2014-10-30 10:02:01 -0400
committerMike Snitzer <snitzer@redhat.com>2014-11-10 15:25:30 -0500
commitf1afb36a6102b52949c2c6d8eb250eddcce3fc5f (patch)
treef8e7143d1118635d88c6989ebb80654c109756f9 /drivers/md
parentb155aa0e5a81ea1f05ff7aced0ec8e34c980c19e (diff)
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 <snitzer@redhat.com>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/dm-cache-policy-mq.c7
1 files changed, 4 insertions, 3 deletions
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,

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