linux-kernel - Re: [PATCH Bug fix 0/5] Bug fix for physical memory hot-remove.

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Message-ID: <5105D57D.3050900@cn.fujitsu.com>
Date:	Mon, 28 Jan 2013 09:33:49 +0800
From:	Tang Chen <tangchen@...fujitsu.com>
To:	Michal Hocko <mhocko@...e.cz>
CC:	Simon Jeons <simon.jeons@...il.com>, akpm@...ux-foundation.org,
	rientjes@...gle.com, len.brown@...el.com, benh@...nel.crashing.org,
	paulus@...ba.org, cl@...ux.com, minchan.kim@...il.com,
	kosaki.motohiro@...fujitsu.com, isimatu.yasuaki@...fujitsu.com,
	wujianguo@...wei.com, wency@...fujitsu.com, hpa@...or.com,
	linfeng@...fujitsu.com, laijs@...fujitsu.com, mgorman@...e.de,
	yinghai@...nel.org, glommer@...allels.com, jiang.liu@...wei.com,
	julian.calaby@...il.com, sfr@...b.auug.org.au, x86@...nel.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org, linux-acpi@...r.kernel.org
Subject: Re: [PATCH Bug fix 0/5] Bug fix for physical memory hot-remove.

On 01/25/2013 09:17 PM, Michal Hocko wrote:
> On Wed 23-01-13 06:29:31, Simon Jeons wrote:
>> On Tue, 2013-01-22 at 19:42 +0800, Tang Chen wrote:
>>> Here are some bug fix patches for physical memory hot-remove. All these
>>> patches are based on the latest -mm tree.
>>> git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git akpm
>>>
>>> And patch1 and patch3 are very important.
>>> patch1: free compound pages when freeing memmap, otherwise the kernel
>>>          will panic the next time memory is hot-added.
>>> patch3: the old way of freeing pagetable pages was wrong. We should never
>>>          split larger pages into small ones.
>>>
>>>
>>
>> Hi Tang,
>>
>> I remember your big physical memory hot-remove patchset has already
>> merged by Andrew, but where I can find it? Could you give me git tree
>> address?
>
> Andrew tree is also mirrored into a git tree.
> http://git.kernel.org/?p=linux/kernel/git/mhocko/mm.git;a=summary
>
> It contains only Memory management patches on top of the last major
> release (since-.X.Y branch).

Hi Michal,

I'm not sure I got your meaning. :)

In http://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git akpm,
I can find the following commit.

commit deed0460e01b3968f2cf46fb94851936535b7e0d
Author: Tang Chen <tangchen@...fujitsu.com>
Date:   Sat Jan 19 11:07:13 2013 +1100

     memory-hotplug: do not allocate pgdat if it was not freed when 
offline.


This is one of memory hot-remove patches. Please try to update the 
mirror tree,
and try to find the above commit.

Thanks. :)

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