From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from fgwmail5.fujitsu.co.jp (fgwmail5.fujitsu.co.jp [192.51.44.35]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id 068942C0220 for ; Mon, 9 Jul 2012 20:21:48 +1000 (EST) Received: from m2.gw.fujitsu.co.jp (unknown [10.0.50.72]) by fgwmail5.fujitsu.co.jp (Postfix) with ESMTP id 1FFA43EE081 for ; Mon, 9 Jul 2012 19:21:45 +0900 (JST) Received: from smail (m2 [127.0.0.1]) by outgoing.m2.gw.fujitsu.co.jp (Postfix) with ESMTP id 069F845DE4D for ; Mon, 9 Jul 2012 19:21:45 +0900 (JST) Received: from s2.gw.fujitsu.co.jp (s2.gw.fujitsu.co.jp [10.0.50.92]) by m2.gw.fujitsu.co.jp (Postfix) with ESMTP id D4A2E45DD78 for ; Mon, 9 Jul 2012 19:21:44 +0900 (JST) Received: from s2.gw.fujitsu.co.jp (localhost.localdomain [127.0.0.1]) by s2.gw.fujitsu.co.jp (Postfix) with ESMTP id C65481DB803A for ; Mon, 9 Jul 2012 19:21:44 +0900 (JST) Received: from g01jpexchyt06.g01.fujitsu.local (g01jpexchyt06.g01.fujitsu.local [10.128.194.45]) by s2.gw.fujitsu.co.jp (Postfix) with ESMTP id 760FB1DB8038 for ; Mon, 9 Jul 2012 19:21:44 +0900 (JST) Message-ID: <4FFAB0A2.8070304@jp.fujitsu.com> Date: Mon, 9 Jul 2012 19:21:22 +0900 From: Yasuaki Ishimatsu MIME-Version: 1.0 To: , , , Subject: [RFC PATCH v3 0/13] memory-hotplug : hot-remove physical memory Content-Type: text/plain; charset="ISO-2022-JP" Cc: len.brown@intel.com, wency@cn.fujitsu.com, paulus@samba.org, minchan.kim@gmail.com, kosaki.motohiro@jp.fujitsu.com, rientjes@google.com, cl@linux.com, akpm@linux-foundation.org, liuj97@gmail.com List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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(-)