mm/vmscan: do not check compaction_ready on promoted zones

We abort direct reclaim if we find the zone is ready for compaction.
Sometimes the zone is just a promoted highmem zone to force a scan of
highmem, which is not the intended zone the caller want to allocate a
page from.  In this situation, setting aborted_reclaim to indicate the
caller turned back to retry the allocation is waste of time and could
cause a loop in __alloc_pages_slowpath().

This patch does not check compaction_ready() on promoted zones to avoid
the above situation.  Only set aborted_reclaim if the caller intended
zone is ready for compaction.

Signed-off-by: Weijie Yang <weijie.yang@samsung.com>
Acked-by: Rik van Riel <riel@redhat.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 1c51e4f..06879ea 100644 (file)
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2318,6 +2318,7 @@ static bool shrink_zones(struct zonelist *zonelist, struct scan_control *sc)
        struct shrink_control shrink = {
                .gfp_mask = sc->gfp_mask,
        };
+       enum zone_type requested_highidx = gfp_zone(sc->gfp_mask);
 
        /*
         * If the number of buffer_heads in the machine exceeds the maximum
@@ -2358,7 +2359,8 @@ static bool shrink_zones(struct zonelist *zonelist, struct scan_control *sc)
                                 * noticeable problem, like transparent huge
                                 * page allocations.
                                 */
-                               if (compaction_ready(zone, sc)) {
+                               if ((zonelist_zone_idx(z) <= requested_highidx)
+                                   && compaction_ready(zone, sc)) {
                                        aborted_reclaim = true;
                                        continue;
                                }