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

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Message-ID: <20091012160503.GA31249@Krystal>
Date:	Mon, 12 Oct 2009 12:05:03 -0400
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	Christoph Lameter <cl@...ux-foundation.org>
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

* Christoph Lameter (cl@...ux-foundation.org) wrote:
> 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.
> 

That's a convincing argument, I agree.

Thanks,

Mathieu


-- 
Mathieu Desnoyers
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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