[RFC PATCH v2 0/13] memory-hotplug : hot-remove physical memory

Yasuaki Ishimatsu
2012-07-03T05:49:21Z

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

[RFC PATCH v2 1/13] memory-hotplug : rename remove_memory to offline_memory
[RFC PATCH v2 2/13] memory-hotplug : add physical memory hotplug code to acpi_memory_device_remove
[RFC PATCH v2 3/13] memory-hotplug : unify argument of firmware_map_add_early/hotplug
[RFC PATCH v2 4/13] memory-hotplug : remove /sys/firmware/memmap/X sysfs
[RFC PATCH v2 5/13] memory-hotplug : does not release memory region in PAGES_PER_SECTION chunks
[RFC PATCH v2 6/13] memory-hotplug : add memory_block_release
[RFC PATCH v2 7/13] memory-hotplug : remove_memory calls __remove_pages
[RFC PATCH v2 8/13] memory-hotplug : check page type in get_page_bootmem
[RFC PATCH v2 9/13] memory-hotplug : move register_page_bootmem_info_node and put_page_bootmem for
sparse-vmemmap
[RFC PATCH v2 10/13] memory-hotplug : implement register_page_bootmem_info_section of sparse-vmemmap
[RFC PATCH v2 11/13] memory-hotplug : free memmap of sparse-vmemmap
[RFC PATCH v2 12/13] memory-hotplug : add node_device_release
[RFC PATCH v2 13/13] 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 2/13]
- /sys/firmware/memmap/X/{end, start, type} : [RFC PATCH 4/13]
- iomem_resource : [RFC PATCH 5/13]
- mem_section and related sysfs files : [RFC PATCH 6-11/13]
- node and related sysfs files : [RFC PATCH 12-13/13]

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.

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()

---
arch/powerpc/platforms/pseries/hotplug-memory.c | 16 +-
arch/x86/mm/init_64.c | 144 ++++++++++++++++++++++++
drivers/acpi/acpi_memhotplug.c | 28 ++++
drivers/base/memory.c | 53 ++++++++
drivers/base/node.c | 7 +
drivers/firmware/memmap.c | 70 +++++++++++
include/linux/firmware-map.h | 6 +
include/linux/memory.h | 5
include/linux/memory_hotplug.h | 17 --
include/linux/mm.h | 5
mm/memory_hotplug.c | 98 ++++++++++++----
mm/sparse.c | 5
12 files changed, 406 insertions(+), 48 deletions(-)