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

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Date:	Mon, 28 Jan 2013 09:15:40 +0100
From:	Michal Hocko <mhocko@...e.cz>
To:	Tang Chen <tangchen@...fujitsu.com>
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 Mon 28-01-13 09:33:49, Tang Chen wrote:
> 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. :)

Well, the mirror tree gets updated when Andrew releases mmotm and quite
often even when mmots is released.
All patches in the mm section are applied.

> 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.

That one is in my mirror tree as f48bf999 (memory-hotplug: do not
allocate pdgat if it was not freed when offline.).
-- 
Michal Hocko
SUSE Labs
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