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

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Message-ID: <84144f020806012358y6a2e5707odca7216a72e4092f@mail.gmail.com>
Date:	Mon, 2 Jun 2008 09:58:01 +0300
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"Paul Mundt" <lethal@...ux-sh.org>,
	"Pekka Enberg" <penberg@...helsinki.fi>,
	"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

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>

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.
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