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

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Message-ID: <464DC0DC.7050809@ru.mvista.com>
Date:	Fri, 18 May 2007 19:06:04 +0400
From:	Sergei Shtylyov <sshtylyov@...mvista.com>
To:	Daniel Walker <dwalker@...sta.com>
Cc:	Kumar Gala <galak@...nel.crashing.org>, 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

Daniel Walker 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.

    You mean, having more than one clocksource is *useful* in this case?

> 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.. 

    Yeah, and there's the rating systems for both clock sources/events.

> Anything like that on PowerPC?

    Well, the decrementer frequency may change, at least in theory (if the bus 
clock changes).

> Daniel

WBR, Sergei
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