Subject: Re: [RFC PATCH 0/8] memory-hotplug : hot-remove physical memory(clear page table)

From: Yasuaki Ishimatsu <[email-masked]>
Date: Fri, 20 Jul 2012 16:31:23 +0900

[Hi Wen,

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

Thanks,
Yasuaki Ishimatsu

2012/07/20 16:06, Wen Congyang wrote:
> 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(-)
>