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dm: add cache target

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Add a target that allows a fast device such as an SSD to be used as a
cache for a slower device such as a disk.

A plug-in architecture was chosen so that the decisions about which data
to migrate and when are delegated to interchangeable tunable policy
modules.  The first general purpose module we have developed, called
"mq" (multiqueue), follows in the next patch.  Other modules are
under development.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Heinz Mauelshagen <mauelshagen@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Joe Thornber
2013-03-01 22:45:51 +00:00
committed by Alasdair G Kergon
parent 7a87edfee7
commit c6b4fcbad0
13 changed files with 4718 additions and 0 deletions
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drivers/md/Kconfig
+13
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@@ -268,6 +268,19 @@ config DM_DEBUG_BLOCK_STACK_TRACING
If unsure, say N.
config DM_CACHE
tristate "Cache target (EXPERIMENTAL)"
depends on BLK_DEV_DM
default n
select DM_PERSISTENT_DATA
select DM_BIO_PRISON
---help---
dm-cache attempts to improve performance of a block device by
moving frequently used data to a smaller, higher performance
device. Different 'policy' plugins can be used to change the
algorithms used to select which blocks are promoted, demoted,
cleaned etc. It supports writeback and writethrough modes.
config DM_MIRROR
tristate "Mirror target"
depends on BLK_DEV_DM