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    Subject[PATCH 01 of 66] disable lumpy when compaction is enabled
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    From: Andrea Arcangeli <aarcange@redhat.com>

    Compaction is more reliable than lumpy, and lumpy makes the system unusable
    when it runs.

    Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
    ---

    diff --git a/mm/vmscan.c b/mm/vmscan.c
    --- a/mm/vmscan.c
    +++ b/mm/vmscan.c
    @@ -274,6 +274,7 @@ unsigned long shrink_slab(unsigned long
    static void set_lumpy_reclaim_mode(int priority, struct scan_control *sc,
    bool sync)
    {
    +#ifndef CONFIG_COMPACTION
    enum lumpy_mode mode = sync ? LUMPY_MODE_SYNC : LUMPY_MODE_ASYNC;

    /*
    @@ -294,11 +295,14 @@ static void set_lumpy_reclaim_mode(int p
    sc->lumpy_reclaim_mode = mode;
    else
    sc->lumpy_reclaim_mode = LUMPY_MODE_NONE;
    +#endif
    }

    static void disable_lumpy_reclaim_mode(struct scan_control *sc)
    {
    +#ifndef CONFIG_COMPACTION
    sc->lumpy_reclaim_mode = LUMPY_MODE_NONE;
    +#endif
    }

    static inline int is_page_cache_freeable(struct page *page)
    @@ -321,9 +325,11 @@ static int may_write_to_queue(struct bac
    if (bdi == current->backing_dev_info)
    return 1;

    +#ifndef CONFIG_COMPACTION
    /* lumpy reclaim for hugepage often need a lot of write */
    if (sc->order > PAGE_ALLOC_COSTLY_ORDER)
    return 1;
    +#endif
    return 0;
    }


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