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    SubjectRe: [PATCH] mm: Fix kswapd livelock on single core, no preempt kernel
    On Wed, Dec 14, 2011 at 4:20 AM, Mel Gorman <> wrote:
    > On Tue, Dec 13, 2011 at 08:36:43PM -0800, Mike Waychison wrote:
    >> FYI, this was seen with a 2.6.39-based kernel with no-numa, no-memcg
    >> and swap-enabled.
    > If this is 2.6.39, can you try applying the commit
    > [f06590bd: mm: vmscan: correctly check if reclaimer should schedule during shrink_slab]
    > There have been a few fixes around kswapd hogging the CPU since 2.6.39.

    In this particular case, I didn't see any problem acquiring
    shrinker_rwsem (the shrinkers should up in the cpu profile I
    gathered). I think this patch would fix my issue though as it happens
    to drop in a cond_resched() into the path. It isn't obvious that this
    cond_resched() really belongs in shrink_slab() though. Thanks :)

    > --
    > Mel Gorman
    > SUSE Labs

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