mm: vmscan: check if reclaim should really abort even if compaction_ready() is true for one zone

If compaction can proceed for a given zone, shrink_zones() does not
reclaim any more pages from it.  After commit [e0c2327: vmscan: abort
reclaim/compaction if compaction can proceed], do_try_to_free_pages()
tries to finish as soon as possible once one zone can compact.

This was intended to prevent slabs being shrunk unnecessarily but there
are side-effects.  One is that a small zone that is ready for compaction
will abort reclaim even if the chances of successfully allocating a THP
from that zone is small.  It also means that reclaim can return too early
even though sc->nr_to_reclaim pages were not reclaimed.

This partially reverts the commit until it is proven that slabs are really
being shrunk unnecessarily but preserves the check to return 1 to avoid
OOM if reclaim was aborted prematurely.

[aarcange@redhat.com: This patch replaces a revert from Andrea]
Signed-off-by: Mel Gorman <mgorman@suse.de>
Reviewed-by: Rik van Riel <riel@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Minchan Kim <minchan.kim@gmail.com>
Cc: Dave Jones <davej@redhat.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Andy Isaacson <adi@hexapodia.org>
Cc: Nai Xia <nai.xia@gmail.com>
Cc: Johannes Weiner <jweiner@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 9 insertions, 10 deletions

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 3b8ede882396..25f90383b391 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2217,7 +2217,8 @@ static inline bool compaction_ready(struct zone *zone, struct scan_control *sc)
  *
  * This function returns true if a zone is being reclaimed for a costly
  * high-order allocation and compaction is ready to begin. This indicates to
- * the caller that it should retry the allocation or fail.
+ * the caller that it should consider retrying the allocation instead of
+ * further reclaim.
  */
 static bool shrink_zones(int priority, struct zonelist *zonelist,
                                         struct scan_control *sc)
@@ -2226,7 +2227,7 @@ static bool shrink_zones(int priority, struct zonelist *zonelist,
         struct zone *zone;
         unsigned long nr_soft_reclaimed;
         unsigned long nr_soft_scanned;
-        bool should_abort_reclaim = false;
+        bool aborted_reclaim = false;
 
         for_each_zone_zonelist_nodemask(zone, z, zonelist,
                                         gfp_zone(sc->gfp_mask), sc->nodemask) {
@@ -2252,7 +2253,7 @@ static bool shrink_zones(int priority, struct zonelist *zonelist,
                                  * allocations.
                                  */
                                 if (compaction_ready(zone, sc)) {
-                                        should_abort_reclaim = true;
+                                        aborted_reclaim = true;
                                         continue;
                                 }
                         }
@@ -2274,7 +2275,7 @@ static bool shrink_zones(int priority, struct zonelist *zonelist,
                 shrink_zone(priority, zone, sc);
         }
 
-        return should_abort_reclaim;
+        return aborted_reclaim;
 }
 
 static bool zone_reclaimable(struct zone *zone)
@@ -2328,7 +2329,7 @@ static unsigned long do_try_to_free_pages(struct zonelist *zonelist,
         struct zoneref *z;
         struct zone *zone;
         unsigned long writeback_threshold;
-        bool should_abort_reclaim;
+        bool aborted_reclaim;
 
         get_mems_allowed();
         delayacct_freepages_start();
@@ -2340,9 +2341,7 @@ static unsigned long do_try_to_free_pages(struct zonelist *zonelist,
                 sc->nr_scanned = 0;
                 if (!priority)
                         disable_swap_token(sc->target_mem_cgroup);
-                should_abort_reclaim = shrink_zones(priority, zonelist, sc);
-                if (should_abort_reclaim)
-                        break;
+                aborted_reclaim = shrink_zones(priority, zonelist, sc);
 
                 /*
                  * Don't shrink slabs when reclaiming memory from
@@ -2409,8 +2408,8 @@ out:
         if (oom_killer_disabled)
                 return 0;
 
-        /* Aborting reclaim to try compaction? don't OOM, then */
-        if (should_abort_reclaim)
+        /* Aborted reclaim to try compaction? don't OOM, then */
+        if (aborted_reclaim)
                 return 1;
 
         /* top priority shrink_zones still had more to do? don't OOM, then */