linux-kernel - Re: [PATCH 14/16] KVM-GST: KVM Steal time registration

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Message-ID: <4D3E0BB9.5070805@redhat.com>
Date:	Mon, 24 Jan 2011 18:31:05 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Glauber Costa <glommer@...hat.com>
CC:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	aliguori@...ibm.com,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Avi Kivity <avi@...hat.com>
Subject: Re: [PATCH 14/16] KVM-GST: KVM Steal time registration

On 01/24/2011 01:06 PM, Glauber Costa wrote:
> Register steal time within KVM. Everytime we sample the steal time
> information, we update a local variable that tells what was the
> last time read. We then account the difference.
>
> Signed-off-by: Glauber Costa<glommer@...hat.com>
> CC: Rik van Riel<riel@...hat.com>
> CC: Jeremy Fitzhardinge<jeremy.fitzhardinge@...rix.com>
> CC: Peter Zijlstra<peterz@...radead.org>
> CC: Avi Kivity<avi@...hat.com>

On second thought - how does this deal with cpu hotplug and
hot unplug?

Do you allocate a new one of these structs every time a cpu
is hot unplugged and then hotplugged, leaking the old one?

Will leaving the old value around confuse the steal time
calculation?
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