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

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Date:	Thu, 15 Jul 2010 17:15:40 +0200
From:	Zeno Davatz <zdavatz@...il.com>
To:	Catalin Marinas <catalin.marinas@....com>
Cc:	Pekka Enberg <penberg@...helsinki.fi>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: kmemleak, cpu usage jump out of nowhere

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:

Best
Zeno
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