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

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Message-ID: <4C3D89AC.4040303@cs.helsinki.fi>
Date:	Wed, 14 Jul 2010 12:55:56 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Catalin Marinas <catalin.marinas@....com>
CC:	Zeno Davatz <zdavatz@...il.com>, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: kmemleak, cpu usage jump out of nowhere

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>

Zeno, this should fix the kmemleak false positives but not the big 
pauses you're seeing.
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