From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric B Munson <emunson@mgebm.net>
Subject: Re: [PATCH v3 5/9] KVM-HV: use schedstats to calculate steal time
Date: Wed, 29 Jun 2011 17:56:42 -0400
Message-ID: <20110629215642.GD3557@mgebm.net>
References: <1309361388-30163-1-git-send-email-glommer@redhat.com>
 <1309361388-30163-6-git-send-email-glommer@redhat.com>
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Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
	Rik van Riel <riel@redhat.com>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Avi Kivity <avi@redhat.com>,
	Anthony Liguori <aliguori@us.ibm.com>,
	Marcelo Tosatti <mtosatti@redhat.com>
To: Glauber Costa <glommer@redhat.com>
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On Wed, 29 Jun 2011, Glauber Costa wrote:

> SCHEDSTATS provide a precise source of information about time tasks
> spent on a runqueue, but not running (among other things). It is
> specially useful for the steal time implementation, because it doesn't
> record halt time at all.
>=20
> To avoid a hard dependency on schedstats, since it is possible one won't
> want to record statistics about all processes running, the previous method
> of time measurement on put/load vcpu is kept  for !SCHEDSTATS.
>=20
> Signed-off-by: Glauber Costa <glommer@redhat.com>
> CC: Rik van Riel <riel@redhat.com>
> CC: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
> CC: Peter Zijlstra <peterz@infradead.org>
> CC: Avi Kivity <avi@redhat.com>
> CC: Anthony Liguori <aliguori@us.ibm.com>
> CC: Eric B Munson <emunson@mgebm.net>
> CC: Marcelo Tosatti <mtosatti@redhat.com>

Tested-by: Eric B Munson <emunson@mgebm.net>


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