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Date: Mon, 3 Jun 2019 21:21:46 +0000
From: Wei Yang <richard.weiyang@gmail.com>
To: David Hildenbrand <david@redhat.com>
Subject: Re: [PATCH v3 00/11] mm/memory_hotplug: Factor out memory block
 devicehandling
Message-ID: <20190603212146.7hdha6wrlxtkxxxr@master>
References: <20190527111152.16324-1-david@redhat.com>
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Reply-To: Wei Yang <richard.weiyang@gmail.com>
Cc: Mark Rutland <mark.rutland@arm.com>, Oscar Salvador <osalvador@suse.com>,
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 <linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org>

IMHO, there is some typo.

s/devicehandling/device handling/

On Mon, May 27, 2019 at 01:11:41PM +0200, David Hildenbrand wrote:
>We only want memory block devices for memory to be onlined/offlined
>(add/remove from the buddy). This is required so user space can
>online/offline memory and kdump gets notified about newly onlined memory.
>
>Let's factor out creation/removal of memory block devices. This helps
>to further cleanup arch_add_memory/arch_remove_memory() and to make
>implementation of new features easier - especially sub-section
>memory hot add from Dan.
>
>Anshuman Khandual is currently working on arch_remove_memory(). I added
>a temporary solution via "arm64/mm: Add temporary arch_remove_memory()
>implementation", that is sufficient as a firsts tep in the context of

s/firsts tep/first step/

>this series. (we don't cleanup page tables in case anything goes
>wrong already)
>
>Did a quick sanity test with DIMM plug/unplug, making sure all devices
>and sysfs links properly get added/removed. Compile tested on s390x and
>x86-64.
>
>Based on next/master.
>
>Next refactoring on my list will be making sure that remove_memory()
>will never deal with zones / access "struct pages". Any kind of zone
>handling will have to be done when offlining system memory / before
>removing device memory. I am thinking about remove_pfn_range_from_zone()",
>du undo everything "move_pfn_range_to_zone()" did.

what is "du undo"? I may not get it.

>
>v2 -> v3:
>- Add "s390x/mm: Fail when an altmap is used for arch_add_memory()"
>- Add "arm64/mm: Add temporary arch_remove_memory() implementation"
>- Add "drivers/base/memory: Pass a block_id to init_memory_block()"
>- Various changes to "mm/memory_hotplug: Create memory block devices
>  after arch_add_memory()" and "mm/memory_hotplug: Create memory block
>  devices after arch_add_memory()" due to switching from sections to
>  block_id's.
>
>v1 -> v2:
>- s390x/mm: Implement arch_remove_memory()
>-- remove mapping after "__remove_pages"
>
>David Hildenbrand (11):
>  mm/memory_hotplug: Simplify and fix check_hotplug_memory_range()
>  s390x/mm: Fail when an altmap is used for arch_add_memory()
>  s390x/mm: Implement arch_remove_memory()
>  arm64/mm: Add temporary arch_remove_memory() implementation
>  drivers/base/memory: Pass a block_id to init_memory_block()
>  mm/memory_hotplug: Allow arch_remove_pages() without
>    CONFIG_MEMORY_HOTREMOVE
>  mm/memory_hotplug: Create memory block devices after arch_add_memory()
>  mm/memory_hotplug: Drop MHP_MEMBLOCK_API
>  mm/memory_hotplug: Remove memory block devices before
>    arch_remove_memory()
>  mm/memory_hotplug: Make unregister_memory_block_under_nodes() never
>    fail
>  mm/memory_hotplug: Remove "zone" parameter from
>    sparse_remove_one_section
>
> arch/arm64/mm/mmu.c            |  17 +++++
> arch/ia64/mm/init.c            |   2 -
> arch/powerpc/mm/mem.c          |   2 -
> arch/s390/mm/init.c            |  18 +++--
> arch/sh/mm/init.c              |   2 -
> arch/x86/mm/init_32.c          |   2 -
> arch/x86/mm/init_64.c          |   2 -
> drivers/base/memory.c          | 134 +++++++++++++++++++--------------
> drivers/base/node.c            |  27 +++----
> include/linux/memory.h         |   6 +-
> include/linux/memory_hotplug.h |  12 +--
> include/linux/node.h           |   7 +-
> mm/memory_hotplug.c            |  44 +++++------
> mm/sparse.c                    |  10 +--
> 14 files changed, 140 insertions(+), 145 deletions(-)
>
>-- 
>2.20.1

-- 
Wei Yang
Help you, Help me