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

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Message-ID: <Pine.LNX.4.64.0805211415420.17915@schroedinger.engr.sgi.com>
Date:	Wed, 21 May 2008 14:16:40 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Pekka Enberg <penberg@...helsinki.fi>
cc:	Matt Mackall <mpm@...enic.com>, linux-kernel@...r.kernel.org,
	lethal@...ux-sh.org, dhowells@...hat.com
Subject: Re: [RFC/PATCH 3/3] SLOB: make ksize() more strict for page allocator
 pass-through

On Thu, 22 May 2008, Pekka Enberg wrote:

> Christoph Lameter wrote:
> > I also would prefer to keep this out of SLUB. Set/Clear PageSlab dirties the
> > cacheline and it forces the unlining of kmalloc_large.
> 
> Hmm, well, that leaves ksize() open for more abuse. I guess we'll just have to
> live with that then.

SLUB could add a BUG_ON(!PageCompound ) since we added buffering for order 
0 allocs. So only order 1 and higher go through kmalloc large. That should 
catch the general case.


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