lkml.org 
[lkml]   [2012]   [Feb]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [PATCHv21 08/16] mm: mmzone: MIGRATE_CMA migration type added
    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>



    \
     
     \ /
      Last update: 2012-02-14 09:33    [W:0.024 / U:0.288 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site