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

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Message-Id: <1254988350.26976.256.camel@twins>
Date:	Thu, 08 Oct 2009 09:52:30 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Christoph Lameter <cl@...ux-foundation.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 Wed, 2009-10-07 at 11:21 -0400, Christoph Lameter wrote:
> On Wed, 7 Oct 2009, Mathieu Desnoyers wrote:
> 
> > You are already calling the scheduler when ending the _fast_ path. I
> > don't see the problem with calling it when you end the slow path
> > execution.
> 
> Well yes that gives rise to the thought of using
> 
> 	preempt_enable_no_sched()

NACK, delaying the reschedule is not an option
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