Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933543Ab2KAJlp (ORCPT ); Thu, 1 Nov 2012 05:41:45 -0400 Received: from cn.fujitsu.com ([222.73.24.84]:5829 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1758990Ab2KAJjH (ORCPT ); Thu, 1 Nov 2012 05:39:07 -0400 X-IronPort-AV: E=Sophos;i="4.80,693,1344182400"; d="scan'208";a="6116041" From: Wen Congyang 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: David Rientjes , Jiang Liu , Len Brown , benh@kernel.crashing.org, paulus@samba.org, Christoph Lameter , Minchan Kim , Andrew Morton , KOSAKI Motohiro , Yasuaki Ishimatsu , Jianguo Wu , Wen Congyang Subject: [PATCH v3 00/12] memory-hotplug: hot-remove physical memory Date: Thu, 1 Nov 2012 17:44:31 +0800 Message-Id: <1351763083-7905-1-git-send-email-wency@cn.fujitsu.com> X-Mailer: git-send-email 1.8.0 X-MIMETrack: Itemize by SMTP Server on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2012/11/01 17:38:10, Serialize by Router on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2012/11/01 17:38:13, Serialize complete at 2012/11/01 17:38:13 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4804 Lines: 122 The patch-set was divided from following thread's patch-set. https://lkml.org/lkml/2012/9/5/201 The last version of this patchset: https://lkml.org/lkml/2012/10/23/213 If you want to know the reason, please read following thread. https://lkml.org/lkml/2012/10/2/83 The patch-set has only the function of kernel core side for physical memory hot remove. So if you use the patch, please apply following patches. - bug fix for memory hot remove https://lkml.org/lkml/2012/10/31/269 - acpi framework https://lkml.org/lkml/2012/10/26/175 The patches can free/remove the following things: - /sys/firmware/memmap/X/{end, start, type} : [PATCH 2/10] - mem_section and related sysfs files : [PATCH 3-4/10] - memmap of sparse-vmemmap : [PATCH 5-7/10] - page table of removed memory : [RFC PATCH 8/10] - node and related sysfs files : [RFC PATCH 9-10/10] * [PATCH 2/10] checks whether the memory can be removed or not. If you find lack of function for physical memory hot-remove, please let me know. How to test this patchset? 1. apply this patchset and build the kernel. MEMORY_HOTPLUG, MEMORY_HOTREMOVE, ACPI_HOTPLUG_MEMORY must be selected. 2. load the module acpi_memhotplug 3. hotplug the memory device(it depends on your hardware) You will see the memory device under the directory /sys/bus/acpi/devices/. Its name is PNP0C80:XX. 4. online/offline pages provided by this memory device You can write online/offline to /sys/devices/system/memory/memoryX/state to online/offline pages provided by this memory device 5. hotremove the memory device You can hotremove the memory device by the hardware, or writing 1 to /sys/bus/acpi/devices/PNP0C80:XX/eject. Note: if the memory provided by the memory device is used by the kernel, it can't be offlined. It is not a bug. Known problems: 1. hotremoving memory device may cause kernel panicked This bug will be fixed by Liu Jiang's patch: https://lkml.org/lkml/2012/7/3/1 Changelogs from v2 to v3: Patch9: call sync_global_pgds() if pgd is changed Patch10: fix a problem int the patch Changelogs from v1 to v2: Patch1: new patch, offline memory twice. 1st iterate: offline every non primary memory block. 2nd iterate: offline primary (i.e. first added) memory block. Patch3: new patch, no logical change, just remove reduntant codes. Patch9: merge the patch from wujianguo into this patch. flush tlb on all cpu after the pagetable is changed. Patch12: new patch, free node_data when a node is offlined Wen Congyang (6): memory-hotplug: try to offline the memory twice to avoid dependence memory-hotplug: remove redundant codes memory-hotplug: introduce new function arch_remove_memory() for removing page table depends on architecture memory-hotplug: remove page table of x86_64 architecture memory-hotplug: remove sysfs file of node memory-hotplug: free node_data when a node is offlined Yasuaki Ishimatsu (6): memory-hotplug: check whether all memory blocks are offlined or not when removing memory memory-hotplug: remove /sys/firmware/memmap/X sysfs memory-hotplug: unregister memory section on SPARSEMEM_VMEMMAP memory-hotplug: implement register_page_bootmem_info_section of sparse-vmemmap memory-hotplug: remove memmap of sparse-vmemmap memory-hotplug: memory_hotplug: clear zone when removing the memory arch/ia64/mm/discontig.c | 14 ++ arch/ia64/mm/init.c | 18 ++ arch/powerpc/mm/init_64.c | 14 ++ arch/powerpc/mm/mem.c | 12 + arch/s390/mm/init.c | 12 + arch/s390/mm/vmem.c | 14 ++ arch/sh/mm/init.c | 17 ++ arch/sparc/mm/init_64.c | 14 ++ arch/tile/mm/init.c | 8 + arch/x86/include/asm/pgtable_types.h | 1 + arch/x86/mm/init_32.c | 12 + arch/x86/mm/init_64.c | 417 +++++++++++++++++++++++++++++++++++ arch/x86/mm/pageattr.c | 47 ++-- drivers/acpi/acpi_memhotplug.c | 8 +- drivers/base/memory.c | 6 + drivers/firmware/memmap.c | 98 +++++++- include/linux/firmware-map.h | 6 + include/linux/memory_hotplug.h | 15 +- include/linux/mm.h | 5 +- mm/memory_hotplug.c | 409 ++++++++++++++++++++++++++++++++-- mm/sparse.c | 5 +- 21 files changed, 1095 insertions(+), 57 deletions(-) -- 1.8.0 -- 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/