linux-kernel - [PATCH] mm: vmscan: reclaim highmem zone if buffer

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Date:	Mon,  4 Apr 2016 08:46:09 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Minchan Kim <minchan@...nel.org>,
	Johannes Weiner <hannes@...xchg.org>, stable@...r.kernel.org
Subject: [PATCH] mm: vmscan: reclaim highmem zone if buffer_heads is over limit

We have been reclaimed highmem zone if buffer_heads is over limit
but [1] changed the behavior so it doesn't reclaim highmem zone
although buffer_heads is over the limit.
This patch restores the logic.

[1] commit 6b4f7799c6a5 ("mm: vmscan: invoke slab shrinkers from shrink_zone()")

Cc: Johannes Weiner <hannes@...xchg.org>
Cc: stable@...r.kernel.org
Signed-off-by: Minchan Kim <minchan@...nel.org>
---
 mm/vmscan.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index c7696a2e11c7..d84efa03c8a8 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2550,7 +2550,7 @@ static void shrink_zones(struct zonelist *zonelist, struct scan_control *sc)
 		sc->gfp_mask |= __GFP_HIGHMEM;
 
 	for_each_zone_zonelist_nodemask(zone, z, zonelist,
-					requested_highidx, sc->nodemask) {
+					gfp_zone(sc->gfp_mask), sc->nodemask) {
 		enum zone_type classzone_idx;
 
 		if (!populated_zone(zone))
-- 
1.9.1