linux-kernel - Re: SLUB: Return ZERO_SIZE

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Message-ID: <Pine.LNX.4.64.0706040916090.23191@schroedinger.engr.sgi.com>
Date:	Mon, 4 Jun 2007 09:16:38 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Pekka Enberg <penberg@...helsinki.fi>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	jeremy@...p.org
Subject: Re: SLUB: Return ZERO_SIZE_PTR for kmalloc(0)

On Mon, 4 Jun 2007, Pekka Enberg wrote:

> On Fri, 1 Jun 2007, Andrew Morton wrote:
> > > They are different instances which happen to have the same length (zero).
> 
> On 6/2/07, Christoph Lameter <clameter@....com> wrote:
> > I guess one could use the slab allocators as a type of reservation
> > ticket generator with zero sized objects. Hmmm.... But is that really a
> > useful thing to do?
> 
> Can someone remind me why we can't do what mm/slab.c does for
> zero-size allocations in slub too?

We are doing that right now. The problem is that people keep storing stuff 
in memory allocated with kmalloc(0).
 
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