linux-kernel - Re: kmemleak, cpu usage jump out of nowhere

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Message-ID: <4C3F2F52.2050101@cs.helsinki.fi>
Date:	Thu, 15 Jul 2010 18:54:58 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Zeno Davatz <zdavatz@...il.com>
CC:	Catalin Marinas <catalin.marinas@....com>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>, x86@...nel.org,
	mingo@...e.hu, yinghai@...nel.org, damien.wyart@...e.fr
Subject: Re: kmemleak, cpu usage jump out of nowhere

Zeno Davatz wrote:
> Dear Catalin
> 
> On Thu, Jul 15, 2010 at 4:58 PM, Catalin Marinas
> <catalin.marinas@....com> wrote:
>> On Wed, 2010-07-14 at 10:55 +0100, Pekka Enberg wrote:
>>> Catalin Marinas wrote:
>>>> On Wed, 2010-07-14 at 09:27 +0100, Zeno Davatz wrote:
>>>>> On Wed, Jul 14, 2010 at 10:05 AM, Pekka Enberg <penberg@...helsinki.fi> wrote:
>>>>>> On Wed, Jul 14, 2010 at 9:12 AM, Zeno Davatz <zdavatz@...il.com> wrote:
>>>>>>> I am attaching you the file from /sys/kernel/debug/kmemleak
>>>>>> Zeno, can you post your dmesg and .config, please?
>>>>> Sure, see attached files.
>>>> It looks like NO_BOOTMEM is enabled. You can try the attached patch (I
>>>> need to post it again on the list).
>>>>
>>>>
>>>> kmemleak: Add support for NO_BOOTMEM configurations
>>>>
>>>> From: Catalin Marinas <catalin.marinas@....com>
>>>>
>>>> With commits 08677214 and 59be5a8e, alloc_bootmem()/free_bootmem() and
>>>> friends use the early_res functions for memory management when
>>>> NO_BOOTMEM is enabled. This patch adds the kmemleak calls in the
>>>> corresponding code paths for bootmem allocations.
>>>>
>>>> Signed-off-by: Catalin Marinas <catalin.marinas@....com>
>>>> Cc: Yinghai Lu <yinghai@...nel.org>
>>>> Cc: H. Peter Anvin <hpa@...or.com>
>>> Makes sense.
>>>
>>> Acked-by: Pekka Enberg <penberg@...helsinki.fi>
>> I'll post an updated patch since I missed a callback. I've been testing
>> it since yesterday and seems ok.
> 
> I also did not have anymore hangs and random bad moods of my CPUs that
> all of a sudden grab 100% of all 8 cores of my CPU power across my
> machine since I disabled
> 
> CONFIG_NO_BOOTMEM:

Interesting. Damien, does disabling CONFIG_NO_BOOTMEM fix you problem too?
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