Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756398Ab2JWK0x (ORCPT ); Tue, 23 Oct 2012 06:26:53 -0400 Received: from cn.fujitsu.com ([222.73.24.84]:22887 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1752953Ab2JWKZa (ORCPT ); Tue, 23 Oct 2012 06:25:30 -0400 X-IronPort-AV: E=Sophos;i="4.80,635,1344182400"; d="scan'208";a="6052019" From: wency@cn.fujitsu.com To: x86@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-acpi@vger.kernel.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, linux-ia64@vger.kernel.org, cmetcalf@tilera.com, sparclinux@vger.kernel.org Cc: rientjes@google.com, liuj97@gmail.com, len.brown@intel.com, benh@kernel.crashing.org, paulus@samba.org, cl@linux.com, minchan.kim@gmail.com, akpm@linux-foundation.org, kosaki.motohiro@jp.fujitsu.com, isimatu.yasuaki@jp.fujitsu.com, Wen Congyang Subject: [PATCH v2 11/12] memory-hotplug: remove sysfs file of node Date: Tue, 23 Oct 2012 18:30:49 +0800 Message-Id: <1350988250-31294-12-git-send-email-wency@cn.fujitsu.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1350988250-31294-1-git-send-email-wency@cn.fujitsu.com> References: <1350988250-31294-1-git-send-email-wency@cn.fujitsu.com> X-MIMETrack: Itemize by SMTP Server on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2012/10/23 18:24:43, Serialize by Router on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2012/10/23 18:24:46, Serialize complete at 2012/10/23 18:24:46 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4875 Lines: 160 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 --- drivers/acpi/acpi_memhotplug.c | 8 +++++- include/linux/memory_hotplug.h | 2 +- mm/memory_hotplug.c | 58 ++++++++++++++++++++++++++++++++++++++- 3 files changed, 64 insertions(+), 4 deletions(-) diff --git a/drivers/acpi/acpi_memhotplug.c b/drivers/acpi/acpi_memhotplug.c index 24c807f..0780f99 100644 --- a/drivers/acpi/acpi_memhotplug.c +++ b/drivers/acpi/acpi_memhotplug.c @@ -310,7 +310,9 @@ static int acpi_memory_disable_device(struct acpi_memory_device *mem_device) { int result; struct acpi_memory_info *info, *n; + int node; + node = acpi_get_node(mem_device->device->handle); /* * Ask the VM to offline this memory range. @@ -318,7 +320,11 @@ static int acpi_memory_disable_device(struct acpi_memory_device *mem_device) */ list_for_each_entry_safe(info, n, &mem_device->res_list, list) { if (info->enabled) { - result = remove_memory(info->start_addr, info->length); + if (node < 0) + node = memory_add_physaddr_to_nid( + info->start_addr); + result = remove_memory(node, info->start_addr, + info->length); if (result) return result; } diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h index d4c4402..7b4cfe6 100644 --- a/include/linux/memory_hotplug.h +++ b/include/linux/memory_hotplug.h @@ -231,7 +231,7 @@ extern int arch_add_memory(int nid, u64 start, u64 size); extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages); extern int offline_memory_block(struct memory_block *mem); extern bool is_memblock_offlined(struct memory_block *mem); -extern int remove_memory(u64 start, u64 size); +extern int remove_memory(int node, u64 start, u64 size); extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn, int nr_pages); extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms); diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index 55a228d..b1fe41d 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -29,6 +29,7 @@ #include #include #include +#include #include @@ -1299,7 +1300,58 @@ static int is_memblock_offlined_cb(struct memory_block *mem, void *arg) return ret; } -int __ref remove_memory(u64 start, u64 size) +static int check_cpu_on_node(void *data) +{ + struct pglist_data *pgdat = data; + int cpu; + + for_each_present_cpu(cpu) { + if (cpu_to_node(cpu) == pgdat->node_id) + /* + * the cpu on this node isn't removed, 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/cpu 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) { unsigned long start_pfn, end_pfn; int ret = 0; @@ -1346,6 +1398,8 @@ repeat: arch_remove_memory(start, size); + try_offline_node(nid); + unlock_memory_hotplug(); return 0; @@ -1355,7 +1409,7 @@ int offline_pages(unsigned long start_pfn, unsigned long nr_pages) { return -EINVAL; } -int remove_memory(u64 start, u64 size) +int remove_memory(int nid, u64 start, u64 size) { return -EINVAL; } -- 1.7.1 -- 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/