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    SubjectRe: [PATCH 1/2] Add mempressure cgroup
    On Fri, Jan 04, 2013 at 12:29:11AM -0800, Anton Vorontsov wrote:
    > This commit implements David Rientjes' idea of mempressure cgroup.
    >
    > The main characteristics are the same to what I've tried to add to vmevent
    > API; internally, it uses Mel Gorman's idea of scanned/reclaimed ratio for
    > pressure index calculation. But we don't expose the index to the userland.
    > Instead, there are three levels of the pressure:
    >
    > o low (just reclaiming, e.g. caches are draining);
    > o medium (allocation cost becomes high, e.g. swapping);
    > o oom (about to oom very soon).
    >
    > The rationale behind exposing levels and not the raw pressure index
    > described here: http://lkml.org/lkml/2012/11/16/675
    >
    > For a task it is possible to be in both cpusets, memcg and mempressure
    > cgroups, so by rearranging the tasks it is possible to watch a specific
    > pressure (i.e. caused by cpuset and/or memcg).
    >
    > Note that while this adds the cgroups support, the code is well separated
    > and eventually we might add a lightweight, non-cgroups API, i.e. vmevent.
    > But this is another story.
    >
    > Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>

    Acked-by: Kirill A. Shutemov <kirill@shutemov.name>

    --
    Kirill A. Shutemov


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