linux-kernel - Re: [BUGFIX][PATCH] memcg: fix page

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Message-ID: <4A3270FE.4090602@linux.vnet.ibm.com>
Date:	Fri, 12 Jun 2009 20:45:10 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
CC:	Pekka Enberg <penberg@...helsinki.fi>,
	Li Zefan <lizf@...fujitsu.com>, linux-kernel@...r.kernel.org,
	mingo@...e.hu, hannes@...xchg.org, torvalds@...ux-foundation.org,
	yinghai@...nel.org, "linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [BUGFIX][PATCH] memcg: fix page_cgroup fatal error in FLATMEM
 v2

KAMEZAWA Hiroyuki wrote:
> On Fri, 12 Jun 2009 09:21:52 +0300
> Pekka Enberg <penberg@...helsinki.fi> wrote:
>>> In future,
>>> We stop to support FLATMEM (if no users) or rewrite codes for flatmem
>>> completely. But this will adds more messy codes and (big) overheads.
>>>
>>> Reported-by: Li Zefan <lizf@...fujitsu.com>
>>> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
>> Looks good to me!
>>
>> Acked-by: Pekka Enberg <penberg@...helsinki.fi>
>>
>> Do you want me to push this to Linus or will you take care of it?
>>
> Could you please push this one ? Typos pointed out by Li Zefan is fixed.
> 
> Thank you all.
> -Kame
> ==
> From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> 
> Now, SLAB is configured in very early stage and it can be used in
> init routine now.
> 
> But replacing alloc_bootmem() in FLAT/DISCONTIGMEM's page_cgroup()
> initialization breaks the allocation, now.
> (Works well in SPARSEMEM case...it supports MEMORY_HOTPLUG and
>  size of page_cgroup is in reasonable size (< 1 << MAX_ORDER.)
> 
> This patch revive FLATMEM+memory cgroup by using alloc_bootmem.
> 
> In future,
> We stop to support FLATMEM (if no users) or rewrite codes for flatmem
> completely.But this will adds more messy codes and overheads.
> 
> Changelog: v1->v2
>  - fixed typos.
> 
> Acked-by: Pekka Enberg <penberg@...helsinki.fi>
> Tested-by: Li Zefan <lizf@...fujitsu.com>
> Reported-by: Li Zefan <lizf@...fujitsu.com>
> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

I see you've responded already, Thanks!

The diff is a bit confusing, was Pekka's patch already integrated, in my version
of mmotm, I don't see the alloc_pages_node() change in my source base.

But overall I agree with the change.


-- 
	Balbir
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