linux-kernel - Re: [this_cpu_xx V7 0/8] Per cpu atomics in core allocators and cleanup

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Message-ID: <alpine.DEB.2.00.0912171327220.3638@router.home>
Date:	Thu, 17 Dec 2009 13:28:34 -0600 (CST)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
cc:	Tejun Heo <tj@...nel.org>, linux-kernel@...r.kernel.org,
	Mel Gorman <mel@....ul.ie>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [this_cpu_xx V7 0/8] Per cpu atomics in core allocators and
 cleanup

> However, I would need:
>
> this_cpu_cmpxchg(scalar, oldv, newv)
>   (maps to x86 cmpxchg)
>
> this_cpu_add_return(scalar, value)
>   (maps to x86 xadd)
>
> too. Is that a planned addition ?

It was not necessary. Its easy to add though.

> (while we are at it, we might as will add the xchg instruction,
> althrough it has an implied LOCK prefix on x86).

Well yeah thats a thorny one. One could use the cmpxchg instead?

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