linux-kernel - Re: [this_cpu_xx V5 19/19] SLUB: Experimental new fastpath w/o interrupt disable

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Message-ID: <alpine.DEB.1.10.0910121137100.21558@gentwo.org>
Date:	Mon, 12 Oct 2009 11:38:25 -0400 (EDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
cc:	Peter Zijlstra <peterz@...radead.org>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org,
	Pekka Enberg <penberg@...helsinki.fi>,
	Tejun Heo <tj@...nel.org>, Mel Gorman <mel@....ul.ie>,
	mingo@...e.hu
Subject: Re: [this_cpu_xx V5 19/19] SLUB: Experimental new fastpath w/o
 interrupt disable

On Mon, 12 Oct 2009, Mathieu Desnoyers wrote:

> local_irq_enable();
> preempt_enable(); <- barrier()
>
> In the first scenario, the compiler barrier is at the beginning of the
> slow path function, which should impose less restrictions on the compiler
> optimizations.

Again: The next statement is a call to a function that calls the page
allocator. Its one call vs two for me. Plus the flow of things is much
cleaner and less obfuscated.



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