linux-kernel - Re: 2.6.28-rc3 mem

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Message-ID: <49151CFF.8060503@us.ibm.com>
Date:	Fri, 07 Nov 2008 21:00:47 -0800
From:	Badari Pulavarty <pbadari@...ibm.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
CC:	Balbir Singh <balbir@...ibm.com>, linux-mm <linux-mm@...ck.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.28-rc3 mem_cgroup panic

KAMEZAWA Hiroyuki wrote:
> KAMEZAWA Hiroyuki said:
>   
>> Badari Pulavarty said:
>>     
>>> Hi Balbir,
>>>
>>> I was running memory remove/add tests in a continuous loop.
>>> I get following panic in mem_cgroup migration code.
>>>
>>> Is this a known issue ?
>>>
>>>       
>> No, this is new one. We don't see panic in cpuset based migration..so..
>> Maybe related to page_cgroup allocation/free code in memory hotplug
>> notifier.
>>
>> Thank you for report. I'll try this.
>>
>>     
> Hmm...at quick look...
>
> online/offline page_cgroup's calculation for "start" is buggy..
>
> -start = start_pfn & (PAGES_PER_SECTION - 1);
> +start = start_pfn & ~(PAGES_PER_SECTION - 1);
>
> I'm sorry I can't write patch today.
>
> Regards,
> -Kame
>
>   

Thanks for the fix. Tests are running fine now.

Thanks,
Badari


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