linux-kernel - Re: [RFC/PATCH 2/3] SLUB: make ksize() more strict for page allocator pass-through

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Message-ID: <483490FB.70703@cs.helsinki.fi>
Date:	Thu, 22 May 2008 00:15:39 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Christoph Lameter <clameter@....com>,
	Vegard Nossum <vegard.nossum@...il.com>
CC:	linux-kernel@...r.kernel.org, mpm@...enic.com, lethal@...ux-sh.org,
	dhowells@...hat.com
Subject: Re: [RFC/PATCH 2/3] SLUB: make ksize() more strict for page allocator
 pass-through

Christoph Lameter wrote:
>> Hmm, where? page_address() already references ->virtual. I suppose
>> CONFIG_SLUB_DEBUG is a no no as well then so do we want to add a
>> CONFIG_KSIZE_DEBUG config option...? (Btw, I removed the BUG_ON() from kfree()
>> as spotted by Vegard Nossum.)
> 
> If it has to be then add CONFIG_KSIZE_DEBUG. There are a number of 
> debugging techniques (kmem_check?) that should not be compiled in. Maybe 
> add a new config option for those. CONFIG_SLUB_ENABLE_EXPENSIVE_DEBUG?

Oh, kmemcheck is a separate config option already and it's *much much* 
more expensive than the ksize() checks will ever be so they shouldn't be 
bundled together anyway.

		Pekka
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