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

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Message-ID: <20091008171750.GA3370@Krystal>
Date:	Thu, 8 Oct 2009 13:17:50 -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 Thu, 8 Oct 2009, Peter Zijlstra wrote:
> 
> > > 	preempt_enable_no_sched()
> >
> > NACK, delaying the reschedule is not an option
> 
> I ended up just doing a preempt_disable() at the beginning and a
> preempt_disable() at the end. That should be easily reviewable.
> 

Then how do you re-enable preemption in the slow path when you need to
block ?

Mathieu


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Mathieu Desnoyers
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