Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756838Ab2JECiy (ORCPT ); Thu, 4 Oct 2012 22:38:54 -0400 Received: from fgwmail6.fujitsu.co.jp ([192.51.44.36]:48270 "EHLO fgwmail6.fujitsu.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756511Ab2JECiv (ORCPT ); Thu, 4 Oct 2012 22:38:51 -0400 X-SecurityPolicyCheck: OK by SHieldMailChecker v1.7.4 Message-ID: <506E481C.8050804@jp.fujitsu.com> Date: Fri, 5 Oct 2012 11:38:20 +0900 From: Yasuaki Ishimatsu User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:15.0) Gecko/20120907 Thunderbird/15.0.1 MIME-Version: 1.0 To: , , , , , , , , , CC: Yasuaki Ishimatsu , , , , , , , , Subject: [PATCH 10/10] memory-hotplug : remove sysfs file of node References: <506E43E0.70507@jp.fujitsu.com> In-Reply-To: <506E43E0.70507@jp.fujitsu.com> Content-Type: text/plain; charset="ISO-2022-JP" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2980 Lines: 105 From: Wen Congyang This patch introduces a new function try_offline_node() to remove sysfs file of node when all memory sections of this node are removed. If some memory sections of this node are not removed, this function does nothing. CC: David Rientjes CC: Jiang Liu CC: Len Brown CC: Christoph Lameter Cc: Minchan Kim CC: Andrew Morton CC: KOSAKI Motohiro CC: Yasuaki Ishimatsu Signed-off-by: Wen Congyang --- mm/memory_hotplug.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 54 insertions(+) Index: linux-3.6/mm/memory_hotplug.c =================================================================== --- linux-3.6.orig/mm/memory_hotplug.c 2012-10-04 18:30:31.767709165 +0900 +++ linux-3.6/mm/memory_hotplug.c 2012-10-04 18:32:46.907842637 +0900 @@ -29,6 +29,7 @@ #include #include #include +#include #include @@ -1276,6 +1277,57 @@ int offline_memory(u64 start, u64 size) return 0; } +static int check_cpu_on_node(void *data) +{ + struct pglist_data *pgdat = data; + int cpu; + + for_each_online_cpu(cpu) { + if (cpu_to_node(cpu) == pgdat->node_id) + /* + * the cpu on this node is onlined, and we can't + * offline this node. + */ + return -EBUSY; + } + + return 0; +} + +/* offline the node if all memory sections of this node are removed */ +static void try_offline_node(int nid) +{ + unsigned long start_pfn = NODE_DATA(nid)->node_start_pfn; + unsigned long end_pfn = start_pfn + NODE_DATA(nid)->node_spanned_pages; + unsigned long pfn; + + for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { + unsigned long section_nr = pfn_to_section_nr(pfn); + + if (!present_section_nr(section_nr)) + continue; + + if (pfn_to_nid(pfn) != nid) + continue; + + /* + * some memory sections of this node are not removed, and we + * can't offline node now. + */ + return; + } + + if (stop_machine(check_cpu_on_node, NODE_DATA(nid), NULL)) + return; + + /* + * all memory sections of this node are removed, we can offline this + * node now. + */ + node_set_offline(nid); + unregister_one_node(nid); +} + int __ref remove_memory(int nid, u64 start, u64 size) { int ret = 0; @@ -1296,6 +1348,8 @@ int __ref remove_memory(int nid, u64 sta firmware_map_remove(start, start + size, "System RAM"); arch_remove_memory(start, size); + + try_offline_node(nid); out: unlock_memory_hotplug(); return ret; -- 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/