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    Subject[PATCH 02/11] mm: compaction: Use synchronous compaction for /proc/sys/vm/compact_memory
    Date
    When asynchronous compaction was introduced, the
    /proc/sys/vm/compact_memory handler should have been updated to always
    use synchronous compaction. This did not happen so this patch addresses
    it. The assumption is if a user writes to /proc/sys/vm/compact_memory,
    they are willing for that process to stall.

    Signed-off-by: Mel Gorman <mgorman@suse.de>
    Reviewed-by: Andrea Arcangeli <aarcange@redhat.com>
    Reviewed-by: Rik van Riel <riel@redhat.com>
    Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
    ---
    mm/compaction.c | 1 +
    1 files changed, 1 insertions(+), 0 deletions(-)

    diff --git a/mm/compaction.c b/mm/compaction.c
    index 237560e..615502b 100644
    --- a/mm/compaction.c
    +++ b/mm/compaction.c
    @@ -666,6 +666,7 @@ static int compact_node(int nid)
    .nr_freepages = 0,
    .nr_migratepages = 0,
    .order = -1,
    + .sync = true,
    };

    zone = &pgdat->node_zones[zoneid];
    --
    1.7.3.4


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