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

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Message-Id: <1254920460.26976.241.camel@twins>
Date:	Wed, 07 Oct 2009 15:01:00 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	cl@...ux-foundation.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

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.

I tried to find the actual code, but frigging paravirt crap obfuscated
the code enough that I actually gave up.
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