dm cache: significant rework to leverage dm-bio-prison-v2

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The cache policy interfaces have been updated to work well with the new
bio-prison v2 interface's ability to queue work immediately (promotion,
demotion, etc) -- overriding benefit being reduced latency on processing
IO through the cache.  Previously such work would be left for the DM
cache core to queue on various lists and then process in batches later
-- this caused a serious delay in latency for IO driven by the cache.

The background tracker code was factored out so that all cache policies
can make use of it.

Also, the "cleaner" policy has been removed and is now a variant of the
smq policy that simply disallows migrations.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

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This commit is contained in:

Joe Thornber

2016-12-15 04:57:31 -05:00

committed by Mike Snitzer

parent 742c8fdc31

commit b29d4986d0

10 changed files with 2087 additions and 2564 deletions

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drivers/md/dm-cache-policy-smq.c

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