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Re: [Xen-devel] Xen timing mode

from [Priya] [Permanent Link][Original]
To: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Subject: Re: [Xen-devel] Xen timing mode
From: Priya <pbhat@xxxxxxxxxxxx>
Date: Tue, 23 Feb 2010 15:49:10 -0500
Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
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Thank you very much!



On Tue, Feb 23, 2010 at 3:28 PM, Jeremy Fitzhardinge <jeremy@xxxxxxxx> wrote:
On 02/23/2010 09:29 AM, Priya wrote:
The Xen Interface manual for Xen v2.0 (attached) Page 4 defines Domain - virtual time as

" The time that progresses at the same pace as system time, but only while a domain is executing -- it stops while a domain is de-scheduled. Therefore the share of the CPU that a domain receives is indicated by the rate at which its virtual time increases."

I am interesting in finding out if any of the timing system calls/instructions like gettimeofday(), hwclock(), rdtsc() can read this domain virtual time.

/proc/stat publishes stolen time for each vcpu (second-last column on the "cpuX" lines); you can subtract that from monotonic time to work out how much vcpu the domain has got.


   J

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