linux-kernel - Re: [PATCH 2/11] Sched clock paravirt op

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Date:	Tue, 06 Feb 2007 15:48:06 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Zachary Amsden <zach@...are.com>
CC:	Andi Kleen <ak@....de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Chris Wright <chrisw@...s-sol.org>
Subject: Re: [PATCH 2/11] Sched clock paravirt op

Zachary Amsden wrote:
> Jeremy Fitzhardinge wrote:
>> Zachary Amsden wrote:
>>  
>>> Scheduled (or available) time and real time are good notions.  Stolen
>>> time is debatable.  But TSC is basically just always wrong.  That's
>>> why I don't want to overload the rdtsc operation.     
>> Well, in the Xen case it is actually guaranteed to be correct and useful
>> as real time, but that's definitely not something we can expect in
>> general.  But you're talking specifically about schedulable vcpu time
>> here, right?
>>   
>
> Not schedulable time, scheduled time (schedulable - scheduled) = stolen

I meant "schedulable" (perhaps "usable" would be better) from the
guest's perspective: total amount of real cpu time each vcpu gets.  ie:
(real - schedulable) = stolen.  So I think we're talking about the same
thing.

    J
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