At 07/20/2012 03:31 PM, Yasuaki Ishimatsu Wrote:

[Hi Wen,

Good news!! I was waiting for this patch to come.
Applying the patches, can we hot-remove physical memory completely?

If all functions success, I guess so.

Thanks
Wen Congyang

Thanks,
Yasuaki Ishimatsu

2012/07/20 16:06, Wen Congyang wrote:

quoted

This patch series aims to support physical memory hot-remove(clear
page table).

This patch series base on ishimatsu's patch series. You can get it here:
http://www.spinics.net/lists/linux-acpi/msg36804.html

The patches can remove following things:
   - page table of removed memory

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

Note:
* The patch "remove memory info from list before freeing it" is being
disccussed
   in other thread. But for testing the patch series, the patch is
needed.
   So I added the patch as [PATCH 0/8].
* You need to apply ishimatsu's patch series first before applying
this patch
   series.

Wen Congyang (8):
   memory-hotplug: store the node id in acpi_memory_device
   memory-hotplug: offline memory only when it is onlined
   memory-hotplug: call remove_memory() to cleanup when removing 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()
   x86: make __split_large_page() generally avialable
   memory-hotplug: implement arch_remove_memory()

  arch/ia64/mm/init.c                  |   16 ++++
  arch/powerpc/mm/mem.c                |   14 +++
  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                |  160
++++++++++++++++++++++++++++++++++
  arch/x86/mm/pageattr.c               |   47 +++++-----
  drivers/acpi/acpi_memhotplug.c       |   24 ++++--
  drivers/acpi/scan.c                  |    3 +-
  include/acpi/acpi_bus.h              |    1 +
  include/linux/memory_hotplug.h       |    1 +
  mm/memory_hotplug.c                  |    2 +-
  14 files changed, 280 insertions(+), 30 deletions(-)