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From: Peter Zijlstra <peterz@infradead.org>
To: Glauber Costa <glommer@redhat.com>
Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
	aliguori@us.ibm.com, Rik van Riel <riel@redhat.com>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>,
	Avi Kivity <avi@redhat.com>
Subject: Re: [PATCH 16/16] KVM-GST: adjust scheduler cpu power
Date: Mon, 24 Jan 2011 20:51:30 +0100	[thread overview]
Message-ID: <1295898690.28776.472.camel@laptop> (raw)
In-Reply-To: <1295895083.15920.9.camel@mothafucka.localdomain>

On Mon, 2011-01-24 at 16:51 -0200, Glauber Costa wrote:
> > I would really much rather see you change update_rq_clock_task() and
> > subtract your ns resolution steal time from our wall-time,
> > update_rq_clock_task() already updates the cpu_power relative to the
> > remaining time available.
> 
> But then we get into the problems we already discussed in previous
> submissions, which is, we don't really want to alter any notion of
> wallclock time. Could you list any more concrete advantages of the
> specific way you proposed? 

clock_task is the time spend on the task, by not taking steal time into
account all steal time is accounted as service to whatever task was
current when the vcpu wasn't running.

It doesn't change wall-time in the sense of gtod, only the service time
to tasks.

  reply	other threads:[~2011-01-24 19:50 UTC|newest]

Thread overview: 57+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-01-24 18:06 [PATCH 00/16] New Proposal for steal time in KVM Glauber Costa
2011-01-24 18:06 ` [PATCH 01/16] KVM-HDR: register KVM basic header infrastructure Glauber Costa
2011-01-26 11:06   ` Avi Kivity
2011-01-26 12:13     ` Glauber Costa
2011-01-26 15:12       ` Avi Kivity
2011-01-26 15:36         ` Glauber Costa
2011-01-26 17:22           ` Anthony Liguori
2011-01-26 17:49             ` Glauber Costa
2011-01-27 12:31               ` Avi Kivity
2011-01-24 18:06 ` [PATCH 02/16] KVM-HV: KVM - KVM Virtual Memory hypervisor implementation Glauber Costa
2011-01-24 18:06 ` [PATCH 03/16] KVM-HDR: KVM Userspace registering ioctl Glauber Costa
2011-01-26 11:12   ` Avi Kivity
2011-01-26 12:14     ` Glauber Costa
2011-01-26 15:14       ` Avi Kivity
2011-01-26 15:23         ` Glauber Costa
2011-01-24 18:06 ` [PATCH 04/16] KVM-HV: " Glauber Costa
2011-01-24 18:06 ` [PATCH 05/16] KVM-HDR: Implement wallclock over KVM - KVM Virtual Memory Glauber Costa
2011-01-26 11:13   ` Avi Kivity
2011-01-26 12:20     ` Glauber Costa
2011-01-26 15:17       ` Avi Kivity
2011-01-26 15:45         ` Glauber Costa
2011-01-27 12:17           ` Avi Kivity
2011-01-24 18:06 ` [PATCH 06/16] " Glauber Costa
2011-01-24 18:06 ` [PATCH 07/16] KVM-GST: " Glauber Costa
2011-01-24 18:06 ` [PATCH 08/16] KVM-HDR: Implement kvmclock systemtime " Glauber Costa
2011-01-24 18:06 ` [PATCH 09/16] KVM-HV: " Glauber Costa
2011-01-24 18:06 ` [PATCH 10/16] KVM-GST: " Glauber Costa
2011-01-24 18:06 ` [PATCH 11/16] KVM-HDR: KVM Steal time implementation Glauber Costa
2011-01-24 23:06   ` Rik van Riel
2011-01-24 18:06 ` [PATCH 12/16] KVM-HV: " Glauber Costa
2011-01-24 23:15   ` Rik van Riel
2011-01-24 18:06 ` [PATCH 13/16] KVM-HV: KVM Steal time calculation Glauber Costa
2011-01-24 23:20   ` Rik van Riel
2011-01-24 18:06 ` [PATCH 14/16] KVM-GST: KVM Steal time registration Glauber Costa
2011-01-24 23:27   ` Rik van Riel
2011-01-24 23:31   ` Rik van Riel
2011-01-25  1:25     ` Glauber Costa
2011-01-25  1:26       ` Rik van Riel
2011-01-25  1:28         ` Glauber Costa
2011-01-24 18:06 ` [PATCH 15/16] KVM-GST: KVM Steal time accounting Glauber Costa
2011-01-24 23:33   ` Rik van Riel
2011-01-24 18:06 ` [PATCH 16/16] KVM-GST: adjust scheduler cpu power Glauber Costa
2011-01-24 18:32   ` Peter Zijlstra
2011-01-24 18:51     ` Glauber Costa
2011-01-24 19:51       ` Peter Zijlstra [this message]
2011-01-24 19:57         ` Glauber Costa
2011-01-25 20:02         ` Glauber Costa
2011-01-25 20:13           ` Peter Zijlstra
2011-01-25 20:47             ` Glauber Costa
2011-01-25 21:07               ` Peter Zijlstra
2011-01-25 21:27                 ` Glauber Costa
2011-01-26  9:57                   ` Peter Zijlstra
2011-01-26 15:43                     ` Glauber Costa
2011-01-26 16:46                       ` Peter Zijlstra
2011-01-26 16:53                         ` Peter Zijlstra
2011-01-26 18:11                         ` Glauber Costa
2011-01-24 19:53       ` Peter Zijlstra

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