linux-kernel - Re: [patch] SLQB v2

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Message-ID: <20080502012321.GE30768@wotan.suse.de>
Date:	Fri, 2 May 2008 03:23:22 +0200
From:	Nick Piggin <npiggin@...e.de>
To:	Christoph Lameter <clameter@....com>
Cc:	"Ahmed S. Darwish" <darwish.07@...il.com>,
	Linux Memory Management List <linux-mm@...ck.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [patch] SLQB v2

On Thu, May 01, 2008 at 06:14:52PM -0700, Christoph Lameter wrote:
> On Fri, 2 May 2008, Nick Piggin wrote:
> 
> > If you are not debugging sl?b.c code/pages, then why would you want to see
> > what those fields are?
> 
> Because you are f.e. inspecting a core dump and want to see why certain 
> fields have certain values to verify that the structures were not 
> overwrittten or corrupted etc.

But overloading struct page values happens in other places too. Putting
everything into struct page is not scalable. We could also make kmalloc
return not a void pointer put a pointer to a union of every possible
structure that kmalloc may ever be used for, just in case we have to
inspect some data structure that could have been overwritten by something
else ;)

But seriously... you can always cast a page to a slub_page to see if it is
unexpectedly a slub page.
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