Messages in this thread | | | Date | Tue, 14 Feb 2012 17:29:02 +0900 | From | KAMEZAWA Hiroyuki <> | Subject | Re: [PATCHv21 08/16] mm: mmzone: MIGRATE_CMA migration type added |
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On Fri, 10 Feb 2012 18:32:23 +0100 Marek Szyprowski <m.szyprowski@samsung.com> wrote:
> From: Michal Nazarewicz <mina86@mina86.com> > > 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> > Tested-by: Rob Clark <rob.clark@linaro.org> > Tested-by: Ohad Ben-Cohen <ohad@wizery.com> > Tested-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
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