diff options
| author | Mike Snitzer <snitzer@redhat.com> | 2014-10-30 15:02:01 +0100 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2014-11-10 21:25:30 +0100 |
| commit | f1afb36a6102b52949c2c6d8eb250eddcce3fc5f (patch) | |
| tree | f8e7143d1118635d88c6989ebb80654c109756f9 /drivers/md | |
| parent | dm cache policy mq: tweak algorithm that decides when to promote a block (diff) | |
| download | linux-f1afb36a6102b52949c2c6d8eb250eddcce3fc5f.tar.xz linux-f1afb36a6102b52949c2c6d8eb250eddcce3fc5f.zip | |
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.c | 7 |
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, |