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    Subject[PATCH 2/2] mm: vmscan: If kswapd has been running too long, allow it to sleep
    Date
    Under constant allocation pressure, kswapd can be in the situation where
    sleeping_prematurely() will always return true even if kswapd has been
    running a long time. Check if kswapd needs to be scheduled.

    Signed-off-by: Mel Gorman <mgorman@suse.de>
    Acked-by: Rik van Riel <riel@redhat.com>
    ---
    mm/vmscan.c | 4 ++++
    1 files changed, 4 insertions(+), 0 deletions(-)

    diff --git a/mm/vmscan.c b/mm/vmscan.c
    index af24d1e..4d24828 100644
    --- a/mm/vmscan.c
    +++ b/mm/vmscan.c
    @@ -2251,6 +2251,10 @@ static bool sleeping_prematurely(pg_data_t *pgdat, int order, long remaining,
    unsigned long balanced = 0;
    bool all_zones_ok = true;

    + /* If kswapd has been running too long, just sleep */
    + if (need_resched())
    + return false;
    +
    /* If a direct reclaimer woke kswapd within HZ/10, it's premature */
    if (remaining)
    return true;
    --
    1.7.3.4


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