Re: [RFC PATCH v5 00/19] memory-hotplug: hot-remove physical memory

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Hi Wen,

2012/07/27 19:20, Wen Congyang wrote:
This patch series aims to support physical memory hot-remove.

The patches can free/remove following things:

   - acpi_memory_info                          : [RFC PATCH 4/19]
   - /sys/firmware/memmap/X/{end, start, type} : [RFC PATCH 8/19]
   - iomem_resource                            : [RFC PATCH 9/19]
   - mem_section and related sysfs files       : [RFC PATCH 10-11, 13-16/19]
   - page table of removed memory              : [RFC PATCH 12/19]
   - node and related sysfs files              : [RFC PATCH 18-19/19]

If you find lack of function for physical memory hot-remove, please let me

change log of v5:
  * merge the patchset to clear page table and the patchset to hot remove
    memory(from ishimatsu) to one big patchset.

Thank you for merging patches. I'll review next Monday.

Yasuaki Ishimatsu

  [RFC PATCH v5 1/19]
    * rename remove_memory() to offline_memory()/offline_pages()

  [RFC PATCH v5 2/19]
    * new patch: implement offline_memory(). This function offlines pages,
      update memory block's state, and notify the userspace that the memory
      block's state is changed.

  [RFC PATCH v5 4/19]
    * offline and remove memory in acpi_memory_disable_device() too.

  [RFC PATCH v5 17/19]
    * new patch: add a new function __remove_zone() to revert the things done
      in the function __add_zone().

  [RFC PATCH v5 18/19]
    * flush work befor reseting node device.

change log of v4:
  * remove "memory-hotplug : unify argument of firmware_map_add_early/hotplug"
    from the patch series, since the patch is a bugfix. It is being disccussed
    on other thread. But for testing the patch series, the patch is needed.
    So I added the patch as [PATCH 0/13].

  [RFC PATCH v4 2/13]
    * check memory is online or not at remove_memory()
    * add memory_add_physaddr_to_nid() to acpi_memory_device_remove() for
      getting node id

  [RFC PATCH v4 3/13]
    * create new patch : check memory is online or not at online_pages()

  [RFC PATCH v4 4/13]
    * add __ref section to remove_memory()
    * call firmware_map_remove_entry() before remove_sysfs_fw_map_entry()

  [RFC PATCH v4 11/13]
    * rewrite register_page_bootmem_memmap() for removing page used as PT/PMD

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:

  [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()

Wen Congyang (5):
   memory-hotplug: implement offline_memory()
   memory-hotplug: store the node id in acpi_memory_device
   memory-hotplug: export the function acpi_bus_remove()
   memory-hotplug: call acpi_bus_remove() to remove memory device
   memory-hotplug: introduce new function arch_remove_memory()

Yasuaki Ishimatsu (14):
   memory-hotplug: rename remove_memory() to
   memory-hotplug: offline and remove memory when removing the memory
   memory-hotplug: check whether memory is present or not
   memory-hotplug: remove /sys/firmware/memmap/X sysfs
   memory-hotplug: does not release memory region in PAGES_PER_SECTION
   memory-hotplug: add memory_block_release
   memory-hotplug: remove_memory calls __remove_pages
   memory-hotplug: check page type in get_page_bootmem
   memory-hotplug: move register_page_bootmem_info_node and
     put_page_bootmem for sparse-vmemmap
   memory-hotplug: implement register_page_bootmem_info_section of
   memory-hotplug: free memmap of sparse-vmemmap
   memory_hotplug: clear zone when the memory is removed
   memory-hotplug: add node_device_release
   memory-hotplug: remove sysfs file of node

  arch/ia64/mm/init.c                             |   16 +
  arch/powerpc/mm/mem.c                           |   14 +
  arch/powerpc/platforms/pseries/hotplug-memory.c |   16 +-
  arch/s390/mm/init.c                             |    8 +
  arch/sh/mm/init.c                               |   15 +
  arch/tile/mm/init.c                             |    8 +
  arch/x86/include/asm/pgtable_types.h            |    1 +
  arch/x86/mm/init_32.c                           |   10 +
  arch/x86/mm/init_64.c                           |  333 ++++++++++++++++++++++
  arch/x86/mm/pageattr.c                          |   47 ++--
  drivers/acpi/acpi_memhotplug.c                  |   51 +++-
  drivers/acpi/scan.c                             |    3 +-
  drivers/base/memory.c                           |   90 ++++++-
  drivers/base/node.c                             |    8 +
  drivers/firmware/memmap.c                       |   78 +++++-
  include/acpi/acpi_bus.h                         |    1 +
  include/linux/firmware-map.h                    |    6 +
  include/linux/memory.h                          |    5 +
  include/linux/memory_hotplug.h                  |   25 +-
  include/linux/mm.h                              |    5 +-
  include/linux/mmzone.h                          |   19 ++
  mm/memory_hotplug.c                             |  337 +++++++++++++++++++++--
  mm/sparse.c                                     |    5 +-
  23 files changed, 1010 insertions(+), 91 deletions(-)

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