linux-kernel - Re: [PATCH] nommu: fix kobjsize() for SLOB and SLUB

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Message-ID: <20080602070105.GA28198@linux-sh.org>
Date:	Mon, 2 Jun 2008 16:01:05 +0900
From:	Paul Mundt <lethal@...ux-sh.org>
To:	Pekka Enberg <penberg@...helsinki.fi>
Cc:	David Howells <dhowells@...hat.com>,
	Christoph Lameter <clameter@....com>,
	LKML <linux-kernel@...r.kernel.org>, cooloney@...nel.org,
	akpm@...ux-foundation.org, mpm@...enic.com
Subject: Re: [PATCH] nommu: fix kobjsize() for SLOB and SLUB

On Mon, Jun 02, 2008 at 09:58:01AM +0300, Pekka Enberg wrote:
> Hi Paul,
> 
> On Mon, Jun 2, 2008 at 9:50 AM, Paul Mundt <lethal@...ux-sh.org> wrote:
> > Well, with that modified version of your patch I posted, even if your
> > previous PG_slab patches aren't applied, kobjsize() doesn't behave any
> > worse than it presently does in terms of object size accuracy.
> >
> > In short: PG_slab doesn't get set and ksize() is never called, so we get
> > the same degree of accuracy as the existing implementation, and the
> > oopses get fixed (and the comments are still accurate, too!). So I think
> > it's worth applying. Verified on all of SLUB/SLOB/SLAB.
> 
> Agreed. Can you send this to Andrew?
> 
> Reviewed-by: Pekka Enberg <penberg@...helsinki.fi>
> 
Will do!

> On Mon, Jun 2, 2008 at 9:50 AM, Paul Mundt <lethal@...ux-sh.org> wrote:
> > As for the call-site question, perhaps I'm misunderstanding your
> > question. alloc_vfsmnt() is the first to call kmem_cache_zalloc() during
> > boot-up on my system, but I'm not sure what relevance this has to
> > anything? Accurately measuring kmem_cache_alloc() and static allocations
> > is going to need quite a bit more of a re-think, but that's out of scope
> > for 2.6.26. Presently I'd rather have my system booting first :-)
> 
> David already mentioned some (most?) of the kobjsize() calls can go
> away and I think we should pursue that for 2.6.27.

Ah, the kobjsize() calls is what you were getting at. Yes, getting rid of
those would be a good plan. I'll start looking at that more in-depth once
I've got some of my other 2.6.27 stuff out of the way. That's definitely
one interface that needs to be killed off with extreme prejudice..
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