linux-kernel - Re: [patch 0/6] Per cpu structures for SLUB

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Message-ID: <Pine.LNX.4.64.0708231223570.14478@schroedinger.engr.sgi.com>
Date:	Thu, 23 Aug 2007 12:25:04 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Peter Zijlstra <peterz@...radead.org>
cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 0/6] Per cpu structures for SLUB

On Thu, 23 Aug 2007, Peter Zijlstra wrote:

> while I like this patch set I'm at odds with the interaction of this and
> making the alloc/free fast paths lockless. 
> 
> The main race is s->cpu_slab[] and c->freelist. How does one close that
> gap?

By either reloading the cpu slab after disabling interupts (my initial 
approach) or by disabling preemption.

> (btw, have you looked at my -rt slub patch?)

I skimmed over it. Not sure what to make of it.

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