Path: csiph.com!feeder.erje.net!2.eu.feeder.erje.net!news.roellig-ltd.de!open-news-network.org!weretis.net!feeder4.news.weretis.net!news.mixmin.net!aioe.org!gothmog.csi.it!bofh.it!news.nic.it!robomod From: Mel Gorman Newsgroups: linux.kernel Subject: [PATCH 20/27] mm, vmscan: Update classzone_idx if buffer_heads_over_limit Date: Fri, 15 Apr 2016 11:20:04 +0200 Message-ID: References: X-Mailer: git-send-email 2.6.4 Sender: robomod@news.nic.it List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Approved: robomod@news.nic.it Lines: 28 Organization: linux.* mail to news gateway X-Original-Cc: Rik van Riel , Vlastimil Babka , Johannes Weiner , Jesper Dangaard Brouer , LKML , Mel Gorman X-Original-Date: Fri, 15 Apr 2016 10:13:26 +0100 X-Original-Message-ID: <1460711613-2761-21-git-send-email-mgorman@techsingularity.net> X-Original-References: <1460711613-2761-1-git-send-email-mgorman@techsingularity.net> X-Original-Sender: linux-kernel-owner@vger.kernel.org Xref: csiph.com linux.kernel:1379610 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 --- 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