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    Subject[PATCH 3/5] vmscan: Force kswapd to take notice faster when high-order watermarks are being hit
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    When a high-order allocation fails, kswapd is kicked so that it reclaims
    at a higher-order to avoid direct reclaimers stall and to help GFP_ATOMIC
    allocations. Something has changed in recent kernels that affect the timing
    where high-order GFP_ATOMIC allocations are now failing with more frequency,
    particularly under pressure. This patch forces kswapd to notice sooner that
    high-order allocations are occuring.

    Signed-off-by: Mel Gorman <mel@csn.ul.ie>
    ---
    mm/vmscan.c | 9 +++++++++
    1 files changed, 9 insertions(+), 0 deletions(-)

    diff --git a/mm/vmscan.c b/mm/vmscan.c
    index 64e4388..cd68109 100644
    --- a/mm/vmscan.c
    +++ b/mm/vmscan.c
    @@ -2016,6 +2016,15 @@ loop_again:
    priority != DEF_PRIORITY)
    continue;

    + /*
    + * Exit quickly to restart if it has been indicated
    + * that higher orders are required
    + */
    + if (pgdat->kswapd_max_order > order) {
    + all_zones_ok = 1;
    + goto out;
    + }
    +
    if (!zone_watermark_ok(zone, order,
    high_wmark_pages(zone), end_zone, 0))
    all_zones_ok = 0;
    --
    1.6.3.3


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