From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760234Ab3EXJjS (ORCPT ); Fri, 24 May 2013 05:39:18 -0400 Received: from cn.fujitsu.com ([222.73.24.84]:14209 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1752859Ab3EXJh2 (ORCPT ); Fri, 24 May 2013 05:37:28 -0400 X-IronPort-AV: E=Sophos;i="4.87,734,1363104000"; d="scan'208";a="7355223" From: Tang Chen To: akpm@linux-foundation.org, mgorman@suse.de, mingo@redhat.com, hpa@zytor.com, minchan@kernel.org, wency@cn.fujitsu.com, laijs@cn.fujitsu.com, yinghai@kernel.org, jiang.liu@huawei.com, tj@kernel.org, liwanp@linux.vnet.ibm.com, isimatu.yasuaki@jp.fujitsu.com, kamezawa.hiroyu@jp.fujitsu.com Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH 4/4] mem-hotplug: Do not free LOCAL_NODE_DATA pages to buddy system in hot-remove procedure. Date: Fri, 24 May 2013 17:30:07 +0800 Message-Id: <1369387807-17956-5-git-send-email-tangchen@cn.fujitsu.com> X-Mailer: git-send-email 1.7.10.1 In-Reply-To: <1369387807-17956-1-git-send-email-tangchen@cn.fujitsu.com> References: <1369387807-17956-1-git-send-email-tangchen@cn.fujitsu.com> X-MIMETrack: Itemize by SMTP Server on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2013/05/24 17:25:48, Serialize by Router on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2013/05/24 17:36:02, Serialize complete at 2013/05/24 17:36:02 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org In memory hot-remove procedure, we free pagetable pages to buddy system. But for local pagetable pages, do not free them to buddy system because they were skipped in offline procedure. The memory block they reside in could have been offlined, and we won't offline it again. Signed-off-by: Tang Chen --- mm/memory_hotplug.c | 8 ++++++++ 1 files changed, 8 insertions(+), 0 deletions(-) diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index 21d6fcb..c30e819 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -119,6 +119,14 @@ void __ref put_page_bootmem(struct page *page) INIT_LIST_HEAD(&page->lru); /* + * Do not free pages with local node kernel data (for now, just + * local pagetables) to the buddy system because we skipped + * these pages when offlining the corresponding block. + */ + if (type == LOCAL_NODE_DATA) + return; + + /* * Please refer to comment for __free_pages_bootmem() * for why we serialize here. */ -- 1.7.1