Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752946AbZDVN72 (ORCPT ); Wed, 22 Apr 2009 09:59:28 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755555AbZDVNxp (ORCPT ); Wed, 22 Apr 2009 09:53:45 -0400 Received: from gir.skynet.ie ([193.1.99.77]:43853 "EHLO gir.skynet.ie" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754927AbZDVNxl (ORCPT ); Wed, 22 Apr 2009 09:53:41 -0400 From: Mel Gorman To: Mel Gorman , Linux Memory Management List Cc: KOSAKI Motohiro , Christoph Lameter , Nick Piggin , Linux Kernel Mailing List , Lin Ming , Zhang Yanmin , Peter Zijlstra , Pekka Enberg , Andrew Morton Subject: [PATCH 16/22] Do not setup zonelist cache when there is only one node Date: Wed, 22 Apr 2009 14:53:21 +0100 Message-Id: <1240408407-21848-17-git-send-email-mel@csn.ul.ie> X-Mailer: git-send-email 1.5.6.5 In-Reply-To: <1240408407-21848-1-git-send-email-mel@csn.ul.ie> References: <1240408407-21848-1-git-send-email-mel@csn.ul.ie> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1358 Lines: 38 There is a zonelist cache which is used to track zones that are not in the allowed cpuset or found to be recently full. This is to reduce cache footprint on large machines. On smaller machines, it just incurs cost for no gain. This patch only uses the zonelist cache when there are NUMA nodes. Signed-off-by: Mel Gorman Reviewed-by: Christoph Lameter --- mm/page_alloc.c | 7 +++++-- 1 files changed, 5 insertions(+), 2 deletions(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 7f45de1..e59bb80 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -1467,8 +1467,11 @@ this_zone_full: if (NUMA_BUILD) zlc_mark_zone_full(zonelist, z); try_next_zone: - if (NUMA_BUILD && !did_zlc_setup) { - /* we do zlc_setup after the first zone is tried */ + if (NUMA_BUILD && !did_zlc_setup && num_online_nodes() > 1) { + /* + * we do zlc_setup after the first zone is tried but only + * if there are multiple nodes make it worthwhile + */ allowednodes = zlc_setup(zonelist, alloc_flags); zlc_active = 1; did_zlc_setup = 1; -- 1.5.6.5 -- 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/