linux-kernel - Re: [PATCH] SLUB use cmpxchg

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Message-ID: <Pine.LNX.4.64.0708271237580.5056@schroedinger.engr.sgi.com>
Date:	Mon, 27 Aug 2007 12:39:35 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Peter Zijlstra <peterz@...radead.org>
cc:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	mingo@...hat.com
Subject: Re: [PATCH] SLUB use cmpxchg_local

On Mon, 27 Aug 2007, Peter Zijlstra wrote:

> So, if the fast path can be done with a preempt off, it might be doable
> to suffer the slow path with a per cpu lock like that.

Sadly the cmpxchg_local requires local per cpu data access. Isnt there 
some way to make this less expensive on RT? Acessing cpu local memory is 
really good for performance on NUMA since the data is optimally placed and 
one can avoid/reduce locking if the process stays tied to the processor.

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