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

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

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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