[ 09/73] mm: vmscan: check if reclaim should really abort even if compaction_ready() is true for one zone

[Ben Hutchings <ben@decadent.org.uk>]

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Mel Gorman <mgorman@suse.de>

commit 0cee34fd72c582b4f8ad8ce00645b75fb4168199 upstream.

Stable note: Not tracked on Bugzilla. THP and compaction was found to
	aggressively reclaim pages and stall systems under different
	situations that was addressed piecemeal over time.

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>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
 mm/vmscan.c |   19 +++++++++----------
 1 file changed, 9 insertions(+), 10 deletions(-)

--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2173,7 +2173,8 @@ static inline bool compaction_ready(stru
  *
  * 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)
@@ -2182,7 +2183,7 @@ static bool shrink_zones(int priority, s
 	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) {
@@ -2208,7 +2209,7 @@ static bool shrink_zones(int priority, s
 				 * allocations.
 				 */
 				if (compaction_ready(zone, sc)) {
-					should_abort_reclaim = true;
+					aborted_reclaim = true;
 					continue;
 				}
 			}
@@ -2230,7 +2231,7 @@ static bool shrink_zones(int priority, s
 		shrink_zone(priority, zone, sc);
 	}
 
-	return should_abort_reclaim;
+	return aborted_reclaim;
 }
 
 static bool zone_reclaimable(struct zone *zone)
@@ -2284,7 +2285,7 @@ static unsigned long do_try_to_free_page
 	struct zoneref *z;
 	struct zone *zone;
 	unsigned long writeback_threshold;
-	bool should_abort_reclaim;
+	bool aborted_reclaim;
 
 	get_mems_allowed();
 	delayacct_freepages_start();
@@ -2296,9 +2297,7 @@ static unsigned long do_try_to_free_page
 		sc->nr_scanned = 0;
 		if (!priority)
 			disable_swap_token(sc->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
@@ -2365,8 +2364,8 @@ 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 */