Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932765Ab2JaLt6 (ORCPT ); Wed, 31 Oct 2012 07:49:58 -0400 Received: from cn.fujitsu.com ([222.73.24.84]:51732 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1756742Ab2JaLs3 (ORCPT ); Wed, 31 Oct 2012 07:48:29 -0400 X-IronPort-AV: E=Sophos;i="4.80,687,1344182400"; d="scan'208";a="6108903" From: Wen Congyang To: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org Cc: Jiang Liu , Len Brown , Andrew Morton , KOSAKI Motohiro , Yasuaki Ishimatsu , rjw@sisk.pl, Lai Jiangshan , Wen Congyang , David Rientjes , Benjamin Herrenschmidt , Paul Mackerras , Christoph Lameter , Minchan Kim , Dave Hansen , Mel Gorman Subject: [Patch v4 8/8] memory-hotplug: allocate zone's pcp before onlining pages Date: Wed, 31 Oct 2012 19:23:14 +0800 Message-Id: <1351682594-17347-9-git-send-email-wency@cn.fujitsu.com> X-Mailer: git-send-email 1.8.0 In-Reply-To: <1351682594-17347-1-git-send-email-wency@cn.fujitsu.com> References: <1351682594-17347-1-git-send-email-wency@cn.fujitsu.com> X-MIMETrack: Itemize by SMTP Server on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2012/10/31 19:16:45, Serialize by Router on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2012/10/31 19:16:55, Serialize complete at 2012/10/31 19:16:55 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2151 Lines: 60 We use __free_page() to put a page to buddy system when onlining pages. __free_page() will store NR_FREE_PAGES in zone's pcp.vm_stat_diff, so we should allocate zone's pcp before onlining pages, otherwise we will lose some free pages. Cc: David Rientjes Cc: Jiang Liu Cc: Len Brown Cc: Benjamin Herrenschmidt Cc: Paul Mackerras Cc: Christoph Lameter Cc: Minchan Kim Cc: KOSAKI Motohiro Cc: Yasuaki Ishimatsu Cc: Dave Hansen Cc: Mel Gorman Signed-off-by: Wen Congyang --- mm/memory_hotplug.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index 72f4fef..63ea7df 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -505,12 +505,16 @@ int __ref online_pages(unsigned long pfn, unsigned long nr_pages) * So, zonelist must be updated after online. */ mutex_lock(&zonelists_mutex); - if (!populated_zone(zone)) + if (!populated_zone(zone)) { need_zonelists_rebuild = 1; + build_all_zonelists(NULL, zone); + } ret = walk_system_ram_range(pfn, nr_pages, &onlined_pages, online_pages_range); if (ret) { + if (need_zonelists_rebuild) + zone_pcp_reset(zone); mutex_unlock(&zonelists_mutex); printk(KERN_DEBUG "online_pages [mem %#010llx-%#010llx] failed\n", (unsigned long long) pfn << PAGE_SHIFT, @@ -526,7 +530,7 @@ int __ref online_pages(unsigned long pfn, unsigned long nr_pages) if (onlined_pages) { node_set_state(zone_to_nid(zone), N_HIGH_MEMORY); if (need_zonelists_rebuild) - build_all_zonelists(NULL, zone); + build_all_zonelists(NULL, NULL); else zone_pcp_update(zone); } -- 1.8.0 -- 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/