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Message-ID: <50126EFD.1060002@jp.fujitsu.com>
Date: Fri, 27 Jul 2012 19:35:41 +0900
From: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
To: Wen Congyang <wency@...fujitsu.com>
CC: <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
<linuxppc-dev@...ts.ozlabs.org>, <linux-acpi@...r.kernel.org>,
<linux-s390@...r.kernel.org>, <linux-sh@...r.kernel.org>,
<linux-ia64@...r.kernel.org>, <cmetcalf@...era.com>,
<rientjes@...gle.com>, <liuj97@...il.com>, <len.brown@...el.com>,
<benh@...nel.crashing.org>, <paulus@...ba.org>, <cl@...ux.com>,
<minchan.kim@...il.com>, <akpm@...ux-foundation.org>,
<kosaki.motohiro@...fujitsu.com>
Subject: Re: [RFC PATCH v5 00/19] memory-hotplug: hot-remove physical memory
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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