From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933250AbcFISId (ORCPT ); Thu, 9 Jun 2016 14:08:33 -0400 Received: from outbound-smtp11.blacknight.com ([46.22.139.16]:56623 "EHLO outbound-smtp11.blacknight.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932782AbcFISIc (ORCPT ); Thu, 9 Jun 2016 14:08:32 -0400 From: Mel Gorman To: Andrew Morton , Linux-MM Cc: Rik van Riel , Vlastimil Babka , Johannes Weiner , LKML , Mel Gorman Subject: [PATCH 20/27] mm, vmscan: Update classzone_idx if buffer_heads_over_limit Date: Thu, 9 Jun 2016 19:04:36 +0100 Message-Id: <1465495483-11855-21-git-send-email-mgorman@techsingularity.net> X-Mailer: git-send-email 2.6.4 In-Reply-To: <1465495483-11855-1-git-send-email-mgorman@techsingularity.net> References: <1465495483-11855-1-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 3edf941e9965..7a2d69612231 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -2547,8 +2547,10 @@ static void 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, gfp_zone(sc->gfp_mask), sc->nodemask) { -- 2.6.4