Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932922AbbFHN7l (ORCPT ); Mon, 8 Jun 2015 09:59:41 -0400 Received: from cantor2.suse.de ([195.135.220.15]:52556 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932605AbbFHN5K (ORCPT ); Mon, 8 Jun 2015 09:57:10 -0400 From: Mel Gorman To: Linux-MM Cc: Rik van Riel , Johannes Weiner , Michal Hocko , LKML , Mel Gorman Subject: [PATCH 16/25] mm, vmscan: Update classzone_idx if buffer_heads_over_limit Date: Mon, 8 Jun 2015 14:56:22 +0100 Message-Id: <1433771791-30567-17-git-send-email-mgorman@suse.de> X-Mailer: git-send-email 2.3.5 In-Reply-To: <1433771791-30567-1-git-send-email-mgorman@suse.de> References: <1433771791-30567-1-git-send-email-mgorman@suse.de> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1174 Lines: 34 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 2a3050d7dc95..140aeefdebe1 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -2497,8 +2497,10 @@ 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) { -- 2.3.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/