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
know.

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.

Thanks,
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:

      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()


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
     offline_memory()/offline_pages()
   memory-hotplug: offline and remove memory when removing the memory
     device
   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
     chunks
   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
     sparse-vmemmap
   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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