linux-kernel - Re: [PATCH 2.6.21-rt2] PowerPC: decrementer clockevent driver

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Date:	Fri, 18 May 2007 07:56:57 -0700
From:	Daniel Walker <dwalker@...sta.com>
To:	Kumar Gala <galak@...nel.crashing.org>
Cc:	Sergei Shtylyov <sshtylyov@...mvista.com>, tglx@...utronix.de,
	mingo@...e.hu, linuxppc-dev@...abs.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2.6.21-rt2] PowerPC: decrementer clockevent driver

On Thu, 2007-05-17 at 13:17 -0500, Kumar Gala wrote:

> 
> I haven't looked at all the new clock/timer code, is there any  
> utility in having support for more than one clock source?

There is if the main clocksource has some issues where it can't be used.
On x86 there are lots of different issues with the clocks, so they have
to get switches once in a while. For instance, if the TSC changes
frequencies then it can't be used, or if the TSC stops in different
power states , it can't be used.. 

Anything like that on PowerPC?

Daniel

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