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.1.10.0910071020320.5671@gentwo.org>
Date:	Wed, 7 Oct 2009 10:21:12 -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 Wed, 7 Oct 2009, Peter Zijlstra wrote:

> On Wed, 2009-10-07 at 08:46 -0400, Mathieu Desnoyers wrote:
> > * local_irq_restore
> >   -> the interrupt line is low. The scheduler won't be called. There is
> >      no preempt_check_resched() call.
>
> That would be an issue with all irq disable sections, so I don't think
> this is actually true.

This was not true in the past... News to me that an irq enable would not
be a scheduling point.
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