linux-kernel - Re: [BUG] "sched: Remove rq->lock from the first half of ttwu()" locks up on ARM

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Message-id: <alpine.LFD.2.00.1105271532060.3207@xanadu.home>
Date:	Fri, 27 May 2011 15:41:49 -0400 (EDT)
From:	Nicolas Pitre <nico@...xnic.net>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Catalin Marinas <catalin.marinas@....com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Peter Zijlstra <peterz@...radead.org>,
	Marc Zyngier <Marc.Zyngier@....com>,
	Frank Rowand <frank.rowand@...sony.com>,
	Oleg Nesterov <oleg@...hat.com>, linux-kernel@...r.kernel.org,
	Yong Zhang <yong.zhang0@...il.com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [BUG] "sched: Remove rq->lock from the first half of ttwu()" locks
 up on ARM

On Fri, 27 May 2011, Ingo Molnar wrote:

> I'd suggest doing this once modern ARM chips get so widespread that 
> you can realistically induce a ~700 usecs irqs-off delays on old, 
> virtual-cache ARM chips. Old chips would likely use old kernels 
> anyway, right?

Those "old" ARM chips are still largely produced and fitted in new 
designs, and using latest kernels.  They are unlikely to fade away 
before a couple years.


Nicolas
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