From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752844Ab2GIKVs (ORCPT ); Mon, 9 Jul 2012 06:21:48 -0400 Received: from fgwmail6.fujitsu.co.jp ([192.51.44.36]:45370 "EHLO fgwmail6.fujitsu.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751857Ab2GIKVq (ORCPT ); Mon, 9 Jul 2012 06:21:46 -0400 X-SecurityPolicyCheck: OK by SHieldMailChecker v1.7.4 Message-ID: <4FFAB0A2.8070304@jp.fujitsu.com> Date: Mon, 9 Jul 2012 19:21:22 +0900 From: Yasuaki Ishimatsu User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:13.0) Gecko/20120614 Thunderbird/13.0.1 MIME-Version: 1.0 To: , , , CC: , , , , , , , , , Subject: [RFC PATCH v3 0/13] memory-hotplug : hot-remove physical memory 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 This patch series aims to support physical memory hot-remove. [RFC PATCH v3 1/13] memory-hotplug : rename remove_memory to offline_memory [RFC PATCH v3 2/13] memory-hotplug : add physical memory hotplug code to acpi_memory_device_remove [RFC PATCH v3 3/13] memory-hotplug : unify argument of firmware_map_add_early/hotplug [RFC PATCH v3 4/13] memory-hotplug : remove /sys/firmware/memmap/X sysfs [RFC PATCH v3 5/13] memory-hotplug : does not release memory region in PAGES_PER_SECTION chunks [RFC PATCH v3 6/13] memory-hotplug : add memory_block_release [RFC PATCH v3 7/13] memory-hotplug : remove_memory calls __remove_pages [RFC PATCH v3 8/13] memory-hotplug : check page type in get_page_bootmem [RFC PATCH v3 9/13] memory-hotplug : move register_page_bootmem_info_node and put_page_bootmem for sparse-vmemmap [RFC PATCH v3 10/13] memory-hotplug : implement register_page_bootmem_info_section of sparse-vmemmap [RFC PATCH v3 11/13] memory-hotplug : free memmap of sparse-vmemmap [RFC PATCH v3 12/13] memory-hotplug : add node_device_release [RFC PATCH v3 13/13] memory-hotplug : remove sysfs file of node Even if you apply these patches, you cannot remove the physical memory completely since these patches are still under development. I want you to cooperate to improve the physical memory hot-remove. So please review these patches and give your comment/idea. The patches can free/remove following things: - acpi_memory_info : [RFC PATCH 2/13] - /sys/firmware/memmap/X/{end, start, type} : [RFC PATCH 4/13] - iomem_resource : [RFC PATCH 5/13] - mem_section and related sysfs files : [RFC PATCH 6-11/13] - node and related sysfs files : [RFC PATCH 12-13/13] The patches cannot do following things yet: - page table of removed memory If you find lack of function for physical memory hot-remove, please let me know. change log of v3: * rebase to 3.5.0-rc6 [RFC PATCH v2 2/13] * remove extra kobject_put() * The patch was commented by Wen. Wen's comment is "acpi_memory_device_remove() should ignore a return value of remove_memory() since caller does not care the return value". But I did not change it since I think caller should care the return value. And I am trying to fix it as follow: https://lkml.org/lkml/2012/7/5/624 [RFC PATCH v2 4/13] * remove a firmware_memmap_entry allocated by kzmalloc() change log of v2: [RFC PATCH v2 2/13] * check whether memory block is offline or not before calling offline_memory() * check whether section is valid or not in is_memblk_offline() * call kobject_put() for each memory_block in is_memblk_offline() [RFC PATCH v2 3/13] * unify the end argument of firmware_map_add_early/hotplug [RFC PATCH v2 4/13] * add release_firmware_map_entry() for freeing firmware_map_entry [RFC PATCH v2 6/13] * add release_memory_block() for freeing memory_block [RFC PATCH v2 11/13] * fix wrong arguments of free_pages() --- arch/powerpc/platforms/pseries/hotplug-memory.c | 16 +- arch/x86/mm/init_64.c | 144 ++++++++++++++++++++++++ drivers/acpi/acpi_memhotplug.c | 28 ++++ drivers/base/memory.c | 54 ++++++++- drivers/base/node.c | 7 + drivers/firmware/memmap.c | 78 ++++++++++++- include/linux/firmware-map.h | 6 + include/linux/memory.h | 5 include/linux/memory_hotplug.h | 17 -- include/linux/mm.h | 5 mm/memory_hotplug.c | 98 ++++++++++++---- mm/sparse.c | 5 12 files changed, 414 insertions(+), 49 deletions(-)