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[Xen-devel] question about timer_interrupt()

from [Rik van Riel]

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Subject:	[Xen-devel] question about timer_interrupt()
From:	Rik van Riel <riel@xxxxxxxxxx>
Date:	Wed, 16 Nov 2005 13:52:34 -0500 (EST)
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I have been reading through timer_interrupt() and related
functions for a bit now, and think I have found a potential
problem.

If a virtual CPU is preempted by the hypervisor while a
process is running on it, it looks like that unlucky
process will get "billed" for CPU time during which the
virtual CPU was not running ...

Am I overlooking something, or is it time to figure out
a way to separate virtual time from wall time so we can
account for the actual CPU time used by processes ?

>From what I can see, this might require a change to the
hypervisor interface, but I am not sure.  Ideas ?

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