On Fri, 10 Feb 2012 18:32:23 +0100 Marek Szyprowski <m.szyprow...@samsung.com> wrote:
> From: Michal Nazarewicz <min...@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 <min...@mina86.com> > Signed-off-by: Marek Szyprowski <m.szyprow...@samsung.com> > Signed-off-by: Kyungmin Park <kyungmin.p...@samsung.com> > Acked-by: Mel Gorman <m...@csn.ul.ie> > Tested-by: Rob Clark <rob.cl...@linaro.org> > Tested-by: Ohad Ben-Cohen <o...@wizery.com> > Tested-by: Benjamin Gaignard <benjamin.gaign...@linaro.org> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hir...@jp.fujitsu.com> -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
