Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759949Ab2J2Ps2 (ORCPT ); Mon, 29 Oct 2012 11:48:28 -0400 Received: from cn.fujitsu.com ([222.73.24.84]:56602 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1759718Ab2J2PsN (ORCPT ); Mon, 29 Oct 2012 11:48:13 -0400 X-IronPort-AV: E=Sophos;i="4.80,673,1344182400"; d="scan'208";a="6093335" From: Lai Jiangshan To: Mel Gorman , David Rientjes , LKML , x86 maintainers Cc: Jiang Liu , Rusty Russell , Yinghai Lu , KAMEZAWA Hiroyuki , Yasuaki ISIMATU , Andrew Morton , Lai Jiangshan , Wen Congyang , linux-mm@kvack.org Subject: [V5 PATCH 20/26] memory_hotplug: allow online/offline memory to result movable node Date: Mon, 29 Oct 2012 23:21:10 +0800 Message-Id: <1351524078-20363-19-git-send-email-laijs@cn.fujitsu.com> X-Mailer: git-send-email 1.7.4.4 In-Reply-To: <1351523301-20048-1-git-send-email-laijs@cn.fujitsu.com> References: <1351523301-20048-1-git-send-email-laijs@cn.fujitsu.com> X-MIMETrack: Itemize by SMTP Server on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2012/10/29 23:19:39, Serialize by Router on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2012/10/29 23:19:45, Serialize complete at 2012/10/29 23:19:45 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2473 Lines: 68 Now, memory management can handle movable node or nodes which don't have any normal memory, so we can dynamic configure and add movable node by: online a ZONE_MOVABLE memory from a previous offline node offline the last normal memory which result a non-normal-memory-node movable-node is very important for power-saving, hardware partitioning and high-available-system(hardware fault management). Signed-off-by: Lai Jiangshan --- mm/memory_hotplug.c | 16 ++++++++++++++++ 1 files changed, 16 insertions(+), 0 deletions(-) diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index a55b547..756744c 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -589,11 +589,19 @@ static int online_pages_range(unsigned long start_pfn, unsigned long nr_pages, return 0; } +#ifdef CONFIG_MOVABLE_NODE +/* when CONFIG_MOVABLE_NODE, we allow online node don't have normal memory */ +static bool can_online_high_movable(struct zone *zone) +{ + return true; +} +#else /* #ifdef CONFIG_MOVABLE_NODE */ /* ensure every online node has NORMAL memory */ static bool can_online_high_movable(struct zone *zone) { return node_state(zone_to_nid(zone), N_NORMAL_MEMORY); } +#endif /* #ifdef CONFIG_MOVABLE_NODE */ /* check which state of node_states will be changed when online memory */ static void node_states_check_changes_online(unsigned long nr_pages, @@ -1097,6 +1105,13 @@ check_pages_isolated(unsigned long start_pfn, unsigned long end_pfn) return offlined; } +#ifdef CONFIG_MOVABLE_NODE +/* when CONFIG_MOVABLE_NODE, we allow online node don't have normal memory */ +static bool can_offline_normal(struct zone *zone, unsigned long nr_pages) +{ + return true; +} +#else /* #ifdef CONFIG_MOVABLE_NODE */ /* ensure the node has NORMAL memory if it is still online */ static bool can_offline_normal(struct zone *zone, unsigned long nr_pages) { @@ -1120,6 +1135,7 @@ static bool can_offline_normal(struct zone *zone, unsigned long nr_pages) */ return present_pages == 0; } +#endif /* #ifdef CONFIG_MOVABLE_NODE */ /* check which state of node_states will be changed when offline memory */ static void node_states_check_changes_offline(unsigned long nr_pages, -- 1.7.4.4 -- 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/