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

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Date:	Wed, 8 Dec 2010 16:43:33 +0100
From:	Linus Walleij <linus.ml.walleij@...il.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Russell King - ARM Linux <linux@....linux.org.uk>,
	Mikael Pettersson <mikpe@...uu.se>,
	Venkatesh Pallipadi <venki@...gle.com>,
	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

2010/12/8 Peter Zijlstra <a.p.zijlstra@...llo.nl>:

> Like said, John Stultz was already looking at doing something like that
> because there's a number of architectures suffering this same problem
> and they're all already using part of the clocksource infrastructure to
> implement the sched_clock() interface simply because they only have a
> single hardware resource.

I was in on that discussion and for the Ux500 this patch was the
outcome:
http://www.arm.linux.org.uk/developer/patches/viewpatch.php?id=6488/1

It seems to work, mostly, it's based off Nico's orion code and
just tries to make everything as explicit as possible.

Uwe has also been onto it I think.

Yours,
Linus Walleij
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