linux-kernel - Re: CFS review

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Message-ID: <p73odhpm0ex.fsf@bingen.suse.de>
Date:	03 Aug 2007 11:29:10 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Matt Mackall <mpm@...enic.com>
Cc:	Arjan van de Ven <arjan@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Roman Zippel <zippel@...ux-m68k.org>,
	Mike Galbraith <efault@....de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: CFS review

Matt Mackall <mpm@...enic.com> writes:
> 
> Indeed. I'm just pointing out that not having TSC, fast HZ, no-HZ
> mode, or high-res timers should not be treated as an unusual
> circumstance. That's a PC-centric view.

The question is if it would be that hard to add TSC equivalent
sched_clock() support to more systems. At least a lot of CPUs I have
ever looked at had some kind of fast clock available. Perhaps it's
more laziness of the developers or cut'n'paste that these are not as
widely used as they should be?

-Andi
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