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mm/zpool: implement common zpool api to zbud/zsmalloc

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Add zpool api.

zpool provides an interface for memory storage, typically of compressed
memory.  Users can select what backend to use; currently the only
implementations are zbud, a low density implementation with up to two
compressed pages per storage page, and zsmalloc, a higher density
implementation with multiple compressed pages per storage page.

Signed-off-by: Dan Streetman <[email protected]>
Tested-by: Seth Jennings <[email protected]>
Cc: Minchan Kim <[email protected]>
Cc: Nitin Gupta <[email protected]>
Cc: Weijie Yang <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Dan Streetman 2014-08-06 16:08:36 -07:00 • committed by Linus Torvalds
commit af8d417a04
5 changed files with 495 additions and 18 deletions
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41
mm/Kconfig
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@ -519,15 +519,17 @@ config CMA_AREAS
If unsure, leave the default value "7".
config ZBUD
tristate
default n
config MEM_SOFT_DIRTY
bool "Track memory changes"
depends on CHECKPOINT_RESTORE && HAVE_ARCH_SOFT_DIRTY && PROC_FS
select PROC_PAGE_MONITOR
help
A special purpose allocator for storing compressed pages.
It is designed to store up to two compressed pages per physical
page. While this design limits storage density, it has simple and
deterministic reclaim properties that make it preferable to a higher
density approach when reclaim will be used.
This option enables memory changes tracking by introducing a
soft-dirty bit on pte-s. This bit it set when someone writes
into a page just as regular dirty bit, but unlike the latter
it can be cleared by hands.
See Documentation/vm/soft-dirty.txt for more details.
config ZSWAP
bool "Compressed cache for swap pages (EXPERIMENTAL)"
@ -549,17 +551,22 @@ config ZSWAP
they have not be fully explored on the large set of potential
configurations and workloads that exist.
config MEM_SOFT_DIRTY
bool "Track memory changes"
depends on CHECKPOINT_RESTORE && HAVE_ARCH_SOFT_DIRTY && PROC_FS
select PROC_PAGE_MONITOR
config ZPOOL
tristate "Common API for compressed memory storage"
default n
help
This option enables memory changes tracking by introducing a
soft-dirty bit on pte-s. This bit it set when someone writes
into a page just as regular dirty bit, but unlike the latter
it can be cleared by hands.
Compressed memory storage API. This allows using either zbud or
zsmalloc.
See Documentation/vm/soft-dirty.txt for more details.
config ZBUD
tristate "Low density storage for compressed pages"
default n
help
A special purpose allocator for storing compressed pages.
It is designed to store up to two compressed pages per physical
page. While this design limits storage density, it has simple and
deterministic reclaim properties that make it preferable to a higher
density approach when reclaim will be used.
config ZSMALLOC
tristate "Memory allocator for compressed pages"