linux-kernel - Re: [patch 01/23] Fall back on interrupt disable in cmpxchg8b on 80386 and 80486

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Message-ID: <Pine.LNX.4.64.0708201346160.30353@schroedinger.engr.sgi.com>
Date:	Mon, 20 Aug 2007 13:46:54 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	mingo@...hat.com
Subject: Re: [patch 01/23] Fall back on interrupt disable in cmpxchg8b on
 80386 and 80486

On Mon, 20 Aug 2007, Mathieu Desnoyers wrote:

> Yes, I use it as synchronization mechanism for my buffer management algorithm
> in LTTng. Since I write in per-cpu buffers and want to be as reentrant
> as possible wrt other contexts (dealing with NMI as worse case, but also
> applies to MCE..), I use local_cmpxchg to reserve space in my buffers.
> It is faster than the standard cmpxchg.

Ok I have seen these numbers in the OLS papers but I could not reproduce 
them in SLUB.

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