linux-kernel - [RFC PATCH 0/12] memory-hotplug : hot-remove physical memory

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Date:	Wed, 27 Jun 2012 14:39:20 +0900
From:	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
To:	<linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
	<linuxppc-dev@...ts.ozlabs.org>, <linux-acpi@...r.kernel.org>
CC:	<len.brown@...el.com>, <benh@...nel.crashing.org>,
	<paulus@...ba.org>, <cl@...ux.com>, <minchan.kim@...il.com>,
	<akpm@...ux-foundation.org>, <kosaki.motohiro@...fujitsu.com>,
	<wency@...fujitsu.com>
Subject: [RFC PATCH 0/12] memory-hotplug : hot-remove physical memory

This patch series aims to support physical memory hot-remove.

  [RFC PATCH 1/12] memory-hotplug : rename remove_memory to offline_memory
  [RFC PATCH 2/12] memory-hogplug : check memory offline in offline_pages
  [RFC PATCH 3/12] memory-hotplug : add physical memory hotplug code to acpi_memory_device_remove
  [RFC PATCH 4/12] memory-hotplug : remove /sys/firmware/memmap/X sysfs
  [RFC PATCH 5/12] memory hotplug : does not release memory region in PAGES_PER_SECTION chunks
  [RFC PATCH 6/12] memory-hotplug : remove_memory calls __remove_pages
  [RFC PATCH 7/12] memory-hotplug : check page type in get_page_bootmem
  [RFC PATCH 8/12] memory-hotplug : move register_page_bootmem_info_node and put_page_bootmem for
sparse-vmemmap
  [RFC PATCH 9/12] memory-hotplug : implement register_page_bootmem_info_section of sparse-vmemmap
  [RFC PATCH 10/12] memory-hotplug : free memmap of sparse-vmemmap
  [RFC PATCH 11/12] memory-hotplug : add node_device_release
  [RFC PATCH 12/12] 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 3/12]
  - /sys/firmware/memmap/X/{end, start, type} : [RFC PATCH 4/12]
  - iomem_resource                            : [RFC PATCH 5/12]
  - mem_section and related sysfs files       : [RFC PATCH 6-10/12]
  - node and related sysfs files              : [RFC PATCH 11-12/12]

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.

---

 arch/powerpc/platforms/pseries/hotplug-memory.c |   16 +-
 arch/x86/mm/init_64.c                           |  142 ++++++++++++++++++++++++
 drivers/acpi/acpi_memhotplug.c                  |   25 +++-
 drivers/base/memory.c                           |   24 +++-
 drivers/base/node.c                             |    7 +
 drivers/firmware/memmap.c                       |   71 ++++++++++++
 include/linux/firmware-map.h                    |    6 +
 include/linux/memory.h                          |    1
 include/linux/memory_hotplug.h                  |   17 --
 include/linux/mm.h                              |    5
 mm/memory_hotplug.c                             |  101 +++++++++++++----
 mm/sparse.c                                     |    5
 12 files changed, 374 insertions(+), 46 deletions(-)


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