linux-kernel - Re: [2.6.35-rc6 patch] increase kmemleak robustness at boot

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Message-ID: <AANLkTimQTwSXQXLzoHvmQ-L++O53w0S6jFRmpQ76-Qp3@mail.gmail.com>
Date:	Wed, 28 Jul 2010 19:39:02 +0100
From:	Daniel J Blueman <daniel.blueman@...il.com>
To:	Pekka Enberg <penberg@...helsinki.fi>
Cc:	Catalin Marinas <catalin.marinas@...il.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [2.6.35-rc6 patch] increase kmemleak robustness at boot

On 28 July 2010 17:49, Pekka Enberg <penberg@...helsinki.fi> wrote:
> Daniel J Blueman wrote:
>>
>> I've consistently been experiencing kmemleak exhaust it's 400-entry
>> early-boot buffer and disabling itself; there have been reports of
>> this also, and I'm finding this on x86-64 with various debug options
>> enabled.
>>
>> If we issue a warning and allow the buffer to wrap, we don't need to
>> hit the kill-switch. While we lose track of some early potential
>> leaks, it's better than no functionality.
>>
>> Let me know if it's acceptable, and many thanks for such an excellent
>> tool,
>
> Is it just potential leaks that we lose or can this cause false positives?

I don't get any false positives having had the buffer wrap a number of
times at early-boot; not to say this can't cause any.

It seems that some kernel debug options are doing heavy early-boot
allocations, so getting any false-positives would likely be a triple
edge case.

Thanks,
  Daniel
-- 
Daniel J Blueman
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