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.1.10.0910081215300.21951@gentwo.org>
Date:	Thu, 8 Oct 2009 12:17:32 -0400 (EDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Peter Zijlstra <peterz@...radead.org>
cc:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	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 Thu, 8 Oct 2009, Peter Zijlstra wrote:

> I just don't get why Christoph is getting all upset about the
> need_resched() check in preempt_enable(), its still cheaper than poking
> at the interrupt flags.

Preempt causes too many performance issues. I keep on thinking that I
could make it easier on people to use it. Guess I better leave it simple
then.



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