linux-kernel - Re: [BUG] 2.6.37-rc3 massive interactivity regression on ARM

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Message-ID: <1292006590.13513.40.camel@laptop>
Date:	Fri, 10 Dec 2010 19:43:10 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Venkatesh Pallipadi <venki@...gle.com>,
	Mikael Pettersson <mikpe@...uu.se>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	John Stultz <johnstul@...ibm.com>
Subject: Re: [BUG] 2.6.37-rc3 massive interactivity regression on ARM

On Fri, 2010-12-10 at 19:10 +0100, Peter Zijlstra wrote:
> There are lots of places in the scheduler that rely on u64 wrap, for now
> the easiest thing for ARM would be to select HAVE_UNSTABLE_SCHED_CLOCK
> for those platforms that implement a short sched_clock().
> 
> While that isn't ideal it is something that makes it work, we can work
> on something more suitable for future kernels. 

Either that, or the thing you proposed a while back in this thread.

Since ARM doesn't have NMIs something like that should work just fine.
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