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

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Message-ID: <20070307180359.GU23311@waste.org>
Date:	Wed, 7 Mar 2007 12:03:59 -0600
From:	Matt Mackall <mpm@...enic.com>
To:	Christoph Lameter <clameter@....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, Mar 07, 2007 at 07:34:38AM -0800, Christoph Lameter wrote:
> On Wed, 7 Mar 2007, Peter Zijlstra wrote:
> 
> > >  	return -1;
> > >  }
> > 
> > Perhaps so something with PAGE_SIZE here, as you know there are
> > platforms/configs where PAGE_SIZE != 4k :-)
> 
> Any allocation > 2k just uses a regular allocation which will waste space.
> 
> 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.

-- 
Mathematics is the supreme nostalgia of our time.
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