From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754460AbcDOJRN (ORCPT ); Fri, 15 Apr 2016 05:17:13 -0400 Received: from outbound-smtp03.blacknight.com ([81.17.249.16]:59388 "EHLO outbound-smtp03.blacknight.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753780AbcDOJRK (ORCPT ); Fri, 15 Apr 2016 05:17:10 -0400 From: Mel Gorman To: Andrew Morton , Linux-MM Cc: Rik van Riel , Vlastimil Babka , Johannes Weiner , Jesper Dangaard Brouer , LKML , Mel Gorman Subject: [PATCH 20/27] mm, vmscan: Update classzone_idx if buffer_heads_over_limit Date: Fri, 15 Apr 2016 10:13:26 +0100 Message-Id: <1460711613-2761-21-git-send-email-mgorman@techsingularity.net> X-Mailer: git-send-email 2.6.4 In-Reply-To: <1460711613-2761-1-git-send-email-mgorman@techsingularity.net> References: <1460711613-2761-1-git-send-email-mgorman@techsingularity.net> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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