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Re: [Xen-devel] Time went backwards
On 10 Mar 2006, at 17:33, Rik van Riel wrote:
To that end, it would be interesting to see if after the first
loop in timer_interrupt(), you can end up with sched_time >
(processed_system_time + delta).
If so, we could end up running per-cpu processed_system_time ahead of
current system time and so get -ve delta the *next* time we run
In my observations, delta is always positive. It is cpu_delta
which goes negative. I'll go count the cpu specific deltas and
will check to see if they are larger than the system wide delta.
Yeah, sorry, I was being sloppy in my terminology. I think comparing
stolen/blocked delta values with cpu_delta would be useful -- see if
those are bigger than we'd expect and pushing per-cpu processed time
too far forward.
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