linux-kernel - Re: [SLUB 2/3] Large kmalloc pass through. Removal of large general slabs

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Message-ID: <Pine.LNX.4.64.0703071022230.22448@schroedinger.engr.sgi.com>
Date:	Wed, 7 Mar 2007 10:23:36 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	Matt Mackall <mpm@...enic.com>
cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>, akpm@...l.org,
	Marcelo Tosatti <marcelo@...ck.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Manfred Spraul <manfred@...orfullife.com>
Subject: Re: [SLUB 2/3] Large kmalloc pass through. Removal of large general
 slabs

On Wed, 7 Mar 2007, Matt Mackall wrote:

> > I have a patch here to make this dependent on page size using a loop. The 
> > problem is that it does not work with some versions of gcc. On the 
> > other hand we really need this since one arch can 
> > actually have an order 22 page size!
> 
> You don't need a loop, you need an if (s >= PAGE_SIZE) at the head of
> your static list.

As I just said: PAGE_SIZE may be quite high. So I would need a looong 
static list. We already check for the size being bigger than 2048 which is 
half the usual page size. Anything larger will get passed through.

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