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[PATCH 21/28] mm, vmscan: Update classzone_idx if buffer_heads_over_limit

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If buffer heads are over the limit then the direct reclaim gfp_mask
is promoted to __GFP_HIGHMEM so that lowmem is indirectly freed. With
node-based reclaim, it is also required that the classzone_idx be updated
or the pages will be skipped.

Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
---
 mm/vmscan.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index e2238ab6ae53..9f2376ad4ce3 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2573,8 +2573,10 @@ static bool shrink_zones(struct zonelist *zonelist, struct scan_control *sc,
 	 * highmem pages could be pinning lowmem pages storing buffer_heads
 	 */
 	orig_mask = sc->gfp_mask;
-	if (buffer_heads_over_limit)
+	if (buffer_heads_over_limit) {
 		sc->gfp_mask |= __GFP_HIGHMEM;
+		classzone_idx = gfp_zone(sc->gfp_mask);
+	}
 
 	for_each_zone_zonelist_nodemask(zone, z, zonelist,
 					classzone_idx, sc->nodemask) {
-- 
2.6.4

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[PATCH 00/28] Move LRU page reclaim from zones to nodes v4 Mel Gorman <mgorman@techsingularity.net> - 2016-04-12 12:30 +0200
  [PATCH 03/28] mm, vmscan: Move lru_lock to the node Mel Gorman <mgorman@techsingularity.net> - 2016-04-12 12:30 +0200
  [PATCH 09/28] mm, vmscan: Simplify the logic deciding whether kswapd sleeps Mel Gorman <mgorman@techsingularity.net> - 2016-04-12 12:30 +0200
  [PATCH 11/28] mm, vmscan: Clear congestion, dirty and need for compaction on a per-node basis Mel Gorman <mgorman@techsingularity.net> - 2016-04-12 12:30 +0200
  [PATCH 27/28] mm: vmstat: Replace __count_zone_vm_events with a zone id equivalent Mel Gorman <mgorman@techsingularity.net> - 2016-04-12 12:50 +0200
  [PATCH 21/28] mm, vmscan: Update classzone_idx if buffer_heads_over_limit Mel Gorman <mgorman@techsingularity.net> - 2016-04-12 12:50 +0200
  [PATCH 24/28] mm, vmscan: Add classzone information to tracepoints Mel Gorman <mgorman@techsingularity.net> - 2016-04-12 12:50 +0200
  [PATCH 28/28] mm: vmstat: Account per-zone stalls and pages skipped during reclaim Mel Gorman <mgorman@techsingularity.net> - 2016-04-12 12:50 +0200
  [PATCH 17/28] mm: Move page mapped accounting to the node Mel Gorman <mgorman@techsingularity.net> - 2016-04-12 12:50 +0200
  [PATCH 26/28] mm: page_alloc: Cache the last node whose dirty limit is reached Mel Gorman <mgorman@techsingularity.net> - 2016-04-12 12:50 +0200
  [PATCH 25/28] mm, page_alloc: Remove fair zone allocation policy Mel Gorman <mgorman@techsingularity.net> - 2016-04-12 12:50 +0200
  [PATCH 14/28] mm, memcg: Move memcg limit enforcement from zones to nodes Mel Gorman <mgorman@techsingularity.net> - 2016-04-12 12:50 +0200
    [PATCH 15/28] mm, workingset: Make working set detection node-aware Mel Gorman <mgorman@techsingularity.net> - 2016-04-12 12:50 +0200
    [PATCH 23/28] mm: Convert zone_reclaim to node_reclaim Mel Gorman <mgorman@techsingularity.net> - 2016-04-12 12:50 +0200
    [PATCH 20/28] mm: Move vmscan writes and file write accounting to the node Mel Gorman <mgorman@techsingularity.net> - 2016-04-12 12:50 +0200
    [PATCH 16/28] mm, page_alloc: Consider dirtyable memory in terms of nodes Mel Gorman <mgorman@techsingularity.net> - 2016-04-12 12:50 +0200
    [PATCH 18/28] mm: Rename NR_ANON_PAGES to NR_ANON_MAPPED Mel Gorman <mgorman@techsingularity.net> - 2016-04-12 12:50 +0200
    [PATCH 22/28] mm, vmscan: Only wakeup kswapd once per node for the requested classzone Mel Gorman <mgorman@techsingularity.net> - 2016-04-12 12:50 +0200
    [PATCH 19/28] mm: Move most file-based accounting to the node Mel Gorman <mgorman@techsingularity.net> - 2016-04-12 12:50 +0200

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