linux-kernel - Re: [RFC PATCH 0/3 V1] mm: add new migrate type and online

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Date:	Wed, 04 Jul 2012 16:23:27 +0800
From:	Lai Jiangshan <laijs@...fujitsu.com>
To:	Minchan Kim <minchan@...nel.org>
CC:	Mel Gorman <mel@....ul.ie>, Chris Metcalf -- <cmetcalf@...era.com>,
	Len Brown -- <lenb@...nel.org>,
	Greg Kroah-Hartman -- <gregkh@...uxfoundation.org>,
	Andi Kleen -- <andi@...stfloor.org>,
	Julia Lawall -- <julia@...u.dk>,
	David Howells -- <dhowells@...hat.com>,
	Benjamin Herrenschmidt -- <benh@...nel.crashing.org>,
	Kay Sievers -- <kay.sievers@...y.org>,
	Ingo Molnar -- <mingo@...e.hu>,
	Paul Gortmaker -- <paul.gortmaker@...driver.com>,
	Daniel Kiper -- <dkiper@...-space.pl>,
	Andrew Morton -- <akpm@...ux-foundation.org>,
	Konrad Rzeszutek Wilk -- <konrad.wilk@...cle.com>,
	Michal Hocko -- <mhocko@...e.cz>,
	KAMEZAWA Hiroyuki -- <kamezawa.hiroyu@...fujitsu.com>,
	Michal Nazarewicz -- <mina86@...a86.com>,
	Marek Szyprowski -- <m.szyprowski@...sung.com>,
	Rik van Riel -- <riel@...hat.com>,
	Bjorn Helgaas -- <bhelgaas@...gle.com>,
	Christoph Lameter -- <cl@...ux.com>,
	David Rientjes -- <rientjes@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>, linux-acpi@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [RFC PATCH 0/3 V1] mm: add new migrate type and online_movable
 for hotplug

On 07/04/2012 03:35 PM, Minchan Kim wrote:
> Hello,
> 
> I am not sure when I can review this series by urgent other works.
> At a glance, it seems to attract me.
> But unfortunately, when I read description in cover-letter, I can't
> find "What's the problem?".
> If you provide that, it could help too many your Ccing people who can
> judge  "whether I dive into code or not"

This patchset adds a stable-movable-migrate-type for memory-management,
It is used for anti-fragmentation(hugepage, big-order alloction...) and
hot-removal-of-memory(virtualization, power-conserve, move memory between systems).
it likes ZONE_MOVABLE, but it is more elastic.

Beside it, it fixes some code of CMA.

Thanks,
Lai


> 
> Thanks!
> 
> Side-Note: What's the "--" of email addresses?

Wrong script, I will resent it.

> 
> On Wed, Jul 4, 2012 at 4:26 PM, Lai Jiangshan <laijs@...fujitsu.com> wrote:
>> The 1st patch fixes the allocation of CMA and prepares for movable-like types.
>>
>> The 2nd patch add a new migrate type which stands for the movable types which
>> pages will not be changed to the other type.
>>
>> I chose the name MIGRATE_HOTREMOVE from MIGRATE_HOTREMOVE
>> and MIGRATE_MOVABLE_STABLE, it just because the first usecase of this new type
>> is for hotremove.
>>
>> The 3th path introduces online_movable. When a memoryblock is onlined
>> by "online_movable", the kernel will not have directly reference to the page
>> of the memoryblock, thus we can remove that memory any time when needed.
>>
>> Different from ZONE_MOVABLE: it can be used for any given memroyblock.
>>
>> Lai Jiangshan (3):
>>   use __rmqueue_smallest when borrow memory from MIGRATE_CMA
>>   add MIGRATE_HOTREMOVE type
>>   add online_movable
>>
>>  arch/tile/mm/init.c            |    2 +-
>>  drivers/acpi/acpi_memhotplug.c |    3 +-
>>  drivers/base/memory.c          |   24 +++++++----
>>  include/linux/memory.h         |    1 +
>>  include/linux/memory_hotplug.h |    4 +-
>>  include/linux/mmzone.h         |   37 +++++++++++++++++
>>  include/linux/page-isolation.h |    2 +-
>>  mm/compaction.c                |    6 +-
>>  mm/memory-failure.c            |    8 +++-
>>  mm/memory_hotplug.c            |   36 +++++++++++++---
>>  mm/page_alloc.c                |   86 ++++++++++++++++-----------------------
>>  mm/vmstat.c                    |    3 +
>>  12 files changed, 136 insertions(+), 76 deletions(-)
>>
>> --
>> 1.7.4.4
>>
> 
> 
> 

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