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    SubjectRe: [Linaro-mm-sig] [PATCH 11/15] mm: trigger page reclaim in alloc_contig_range() to stabilize watermarks
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    On Wed, 08 Feb 2012 03:04:18 +0100, sandeep patil <psandeep.s@gmail.com> wrote:
    > There's another problem I am facing with zone watermarks and CMA.
    >
    > Test details:
    > Memory : 480 MB of total memory, 128 MB CMA region
    > Test case : around 600 MB of file transfer over USB RNDIS onto target
    > System Load : ftpd with console running on target.
    > No one is doing CMA allocations except for the DMA allocations done by the
    > drivers.
    >
    > Result : After about 300MB transfer, I start getting GFP_ATOMIC
    > allocation failures. This only happens if CMA region is reserved.

    [...]

    > Total memory available is way above the zone watermarks. So, we ended
    > up starving
    > UNMOVABLE/RECLAIMABLE atomic allocations that cannot fallback on CMA region.

    This looks like something Mel warned me about. I don't really have a good
    solution for that yet. ;/

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    ..o | Computer Science, Michał “mina86” Nazarewicz (o o)
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