Re: [Xen-devel] Calculating real cpu usage of Xen domains correctly!

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 24 Feb 2005, at 21:46, John L Griffin wrote:

> 3. All the "event_pending(prev)" check in __enter_scheduler() is for 
> is to
> say "whoops, an event arrived in the time between when the guest OS
> blocked & right now, so I should clear the BLOCKED flag."  This is so 
> the
> domain can be rescheduled at the scheduler's earliest discretion 
> (possibly
> immediately).
It's to avoid a wakeup waiting race that could cause the domain to be 
descheduled for unbounded time despite the fact that it now has work to 
do (event processing).
But yes, we'd expect that check not to trigger very often in normal 
circumstances.
 -- Keir



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