linux-kernel - Re: [PATCH] Implement slub fastpath in terms of freebase and freeoffset

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Message-ID: <20080229130348.GA9714@Krystal>
Date:	Fri, 29 Feb 2008 08:03:48 -0500
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	Christoph Lameter <clameter@....com>
Cc:	Eric Dumazet <dada1@...mosbay.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Torsten Kaiser <just.for.lkml@...glemail.com>,
	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Implement slub fastpath in terms of freebase and
	freeoffset

* Christoph Lameter (clameter@....com) wrote:
> On Thu, 28 Feb 2008, Mathieu Desnoyers wrote:
> 
> > * Christoph Lameter (clameter@....com) wrote:
> > > On Thu, 28 Feb 2008, Mathieu Desnoyers wrote:
> > > 
> > > > In short, the we also use the versioning to check for change of slab.
> 
> Then we do not need the page->end field anymore right? I will try 
> to rediff your patch against current slab-mm and see how we can proceed 
> from there.

I guess you could replace page->end with the (expensive)
page_address(page) + 1 in new_slab.

You would also have to change slab_address() to use
page_address(page). Since this is used by check_valid_pointer, I am not
sure it's a good idea to use this slow operation there.

Or maybe you have a different alternative in mind ?

Mathieu

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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