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    Subject[PATCH 02/17] mm: page_alloc: Do not treat a zone that cannot be used for dirty pages as "full"
    Date
    If a zone cannot be used for a dirty page then it gets marked "full"
    which is cached in the zlc and later potentially skipped by allocation
    requests that have nothing to do with dirty zones.

    Signed-off-by: Mel Gorman <mgorman@suse.de>
    Acked-by: Johannes Weiner <hannes@cmpxchg.org>
    ---
    mm/page_alloc.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    diff --git a/mm/page_alloc.c b/mm/page_alloc.c
    index f8b80c3..5c559e3 100644
    --- a/mm/page_alloc.c
    +++ b/mm/page_alloc.c
    @@ -1976,7 +1976,7 @@ zonelist_scan:
    */
    if ((alloc_flags & ALLOC_WMARK_LOW) &&
    (gfp_mask & __GFP_WRITE) && !zone_dirty_ok(zone))
    - goto this_zone_full;
    + continue;

    mark = zone->watermark[alloc_flags & ALLOC_WMARK_MASK];
    if (!zone_watermark_ok(zone, order, mark,
    --
    1.8.4.5


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