]> git.baikalelectronics.ru Git - kernel.git/commit
mm: mmzone: MIGRATE_CMA migration type added
authorMichal Nazarewicz <mina86@mina86.com>
Thu, 29 Dec 2011 12:09:50 +0000 (13:09 +0100)
committerMarek Szyprowski <m.szyprowski@samsung.com>
Mon, 21 May 2012 13:09:32 +0000 (15:09 +0200)
commit336685df6c466138fe7db24352c697bbd16eb345
tree00df88cf2f60a2a3efc1a6c46ad88d128aee2071
parent2c1a67c9868ad0491f6a4cf65253a1f96b3cd126
mm: mmzone: MIGRATE_CMA migration type added

The MIGRATE_CMA migration type has two main characteristics:
(i) only movable pages can be allocated from MIGRATE_CMA
pageblocks and (ii) page allocator will never change migration
type of MIGRATE_CMA pageblocks.

This guarantees (to some degree) that page in a MIGRATE_CMA page
block can always be migrated somewhere else (unless there's no
memory left in the system).

It is designed to be used for allocating big chunks (eg. 10MiB)
of physically contiguous memory.  Once driver requests
contiguous memory, pages from MIGRATE_CMA pageblocks may be
migrated away to create a contiguous block.

To minimise number of migrations, MIGRATE_CMA migration type
is the last type tried when page allocator falls back to other
migration types when requested.

Signed-off-by: Michal Nazarewicz <mina86@mina86.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Tested-by: Rob Clark <rob.clark@linaro.org>
Tested-by: Ohad Ben-Cohen <ohad@wizery.com>
Tested-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Tested-by: Robert Nelson <robertcnelson@gmail.com>
Tested-by: Barry Song <Baohua.Song@csr.com>
include/linux/gfp.h
include/linux/mmzone.h
mm/Kconfig
mm/compaction.c
mm/page_alloc.c
mm/vmstat.c