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From: Jeremy Fitzhardinge <>
To: Zachary Amsden <>
Cc: Andi Kleen <>,
	Linux Kernel Mailing List <>,
	Andrew Morton <>,
	Rusty Russell <>,
	Chris Wright <>
Subject: Re: [PATCH 2/11] Sched clock paravirt op
Date: Tue, 06 Feb 2007 15:48:06 -0800	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

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


  reply	other threads:[~2007-02-06 23:48 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-06  3:52 Zachary Amsden
2007-02-06  4:00 ` Zachary Amsden
2007-02-06 12:32 ` Andi Kleen
2007-02-06 22:47   ` Zachary Amsden
2007-02-06 23:23     ` Jeremy Fitzhardinge
2007-02-06 23:42       ` Zachary Amsden
2007-02-06 23:48         ` Jeremy Fitzhardinge [this message]
2007-02-06 23:50           ` Zachary Amsden

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