From patchwork Wed Sep 5 09:25:35 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wen Congyang X-Patchwork-Id: 181806 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 176B12C03C5 for ; Wed, 5 Sep 2012 19:25:17 +1000 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758519Ab2IEJYl (ORCPT ); Wed, 5 Sep 2012 05:24:41 -0400 Received: from cn.fujitsu.com ([222.73.24.84]:12823 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1752976Ab2IEJUd (ORCPT ); Wed, 5 Sep 2012 05:20:33 -0400 X-IronPort-AV: E=Sophos;i="4.80,373,1344182400"; d="scan'208";a="5789088" Received: from unknown (HELO tang.cn.fujitsu.com) ([10.167.250.3]) by song.cn.fujitsu.com with ESMTP; 05 Sep 2012 17:19:15 +0800 Received: from fnstmail02.fnst.cn.fujitsu.com (tang.cn.fujitsu.com [127.0.0.1]) by tang.cn.fujitsu.com (8.14.3/8.13.1) with ESMTP id q859KOHG029996; Wed, 5 Sep 2012 17:20:24 +0800 Received: from ghost.fnst.cn.fujitsu.com ([10.167.225.226]) by fnstmail02.fnst.cn.fujitsu.com (Lotus Domino Release 8.5.3) with ESMTP id 2012090517200210-640076 ; Wed, 5 Sep 2012 17:20:02 +0800 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: [RFC v9 PATCH 01/21] memory-hotplug: rename remove_memory() to offline_memory()/offline_pages() Date: Wed, 5 Sep 2012 17:25:35 +0800 Message-Id: <1346837155-534-2-git-send-email-wency@cn.fujitsu.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1346837155-534-1-git-send-email-wency@cn.fujitsu.com> References: <1346837155-534-1-git-send-email-wency@cn.fujitsu.com> X-MIMETrack: Itemize by SMTP Server on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2012/09/05 17:20:02, Serialize by Router on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2012/09/05 17:20:03, Serialize complete at 2012/09/05 17:20:03 Sender: sparclinux-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: sparclinux@vger.kernel.org From: Yasuaki Ishimatsu remove_memory() only try to offline pages. It is called in two cases: 1. hot remove a memory device 2. echo offline >/sys/devices/system/memory/memoryXX/state In the 1st case, we should also change memory block's state, and notify the userspace that the memory block's state is changed after offlining pages. So rename remove_memory() to offline_memory()/offline_pages(). And in the 1st case, offline_memory() will be used. The function offline_memory() is not implemented. In the 2nd case, offline_pages() will be used. CC: David Rientjes CC: Jiang Liu CC: Len Brown CC: Benjamin Herrenschmidt CC: Paul Mackerras CC: Christoph Lameter Cc: Minchan Kim CC: Andrew Morton CC: KOSAKI Motohiro Signed-off-by: Yasuaki Ishimatsu Signed-off-by: Wen Congyang --- drivers/acpi/acpi_memhotplug.c | 2 +- drivers/base/memory.c | 9 +++------ include/linux/memory_hotplug.h | 3 ++- mm/memory_hotplug.c | 22 ++++++++++++++-------- 4 files changed, 20 insertions(+), 16 deletions(-) diff --git a/drivers/acpi/acpi_memhotplug.c b/drivers/acpi/acpi_memhotplug.c index 24c807f..2a7beac 100644 --- a/drivers/acpi/acpi_memhotplug.c +++ b/drivers/acpi/acpi_memhotplug.c @@ -318,7 +318,7 @@ 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); + result = offline_memory(info->start_addr, info->length); if (result) return result; } diff --git a/drivers/base/memory.c b/drivers/base/memory.c index 7dda4f7..44e7de6 100644 --- a/drivers/base/memory.c +++ b/drivers/base/memory.c @@ -248,26 +248,23 @@ static bool pages_correctly_reserved(unsigned long start_pfn, static int memory_block_action(unsigned long phys_index, unsigned long action) { - unsigned long start_pfn, start_paddr; + unsigned long start_pfn; unsigned long nr_pages = PAGES_PER_SECTION * sections_per_block; struct page *first_page; int ret; first_page = pfn_to_page(phys_index << PFN_SECTION_SHIFT); + start_pfn = page_to_pfn(first_page); switch (action) { case MEM_ONLINE: - start_pfn = page_to_pfn(first_page); - if (!pages_correctly_reserved(start_pfn, nr_pages)) return -EBUSY; ret = online_pages(start_pfn, nr_pages); break; case MEM_OFFLINE: - start_paddr = page_to_pfn(first_page) << PAGE_SHIFT; - ret = remove_memory(start_paddr, - nr_pages << PAGE_SHIFT); + ret = offline_pages(start_pfn, nr_pages); break; default: WARN(1, KERN_WARNING "%s(%ld, %ld) unknown action: " diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h index 910550f..c183f39 100644 --- a/include/linux/memory_hotplug.h +++ b/include/linux/memory_hotplug.h @@ -233,7 +233,8 @@ static inline int is_mem_section_removable(unsigned long pfn, extern int mem_online_node(int nid); extern int add_memory(int nid, u64 start, u64 size); extern int arch_add_memory(int nid, u64 start, u64 size); -extern int remove_memory(u64 start, u64 size); +extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages); +extern int offline_memory(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 3ad25f9..bb42316 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -866,7 +866,7 @@ check_pages_isolated(unsigned long start_pfn, unsigned long end_pfn) return offlined; } -static int __ref offline_pages(unsigned long start_pfn, +static int __ref __offline_pages(unsigned long start_pfn, unsigned long end_pfn, unsigned long timeout) { unsigned long pfn, nr_pages, expire; @@ -994,18 +994,24 @@ out: return ret; } -int remove_memory(u64 start, u64 size) +int offline_pages(unsigned long start_pfn, unsigned long nr_pages) { - unsigned long start_pfn, end_pfn; + return __offline_pages(start_pfn, start_pfn + nr_pages, 120 * HZ); +} - start_pfn = PFN_DOWN(start); - end_pfn = start_pfn + PFN_DOWN(size); - return offline_pages(start_pfn, end_pfn, 120 * HZ); +int offline_memory(u64 start, u64 size) +{ + return -EINVAL; } #else -int remove_memory(u64 start, u64 size) +int offline_pages(unsigned long start, unsigned long size) +{ + return -EINVAL; +} + +int offline_memory(u64 start, u64 size) { return -EINVAL; } #endif /* CONFIG_MEMORY_HOTREMOVE */ -EXPORT_SYMBOL_GPL(remove_memory); +EXPORT_SYMBOL_GPL(offline_memory);