Messages in this thread | | | Date | Mon, 27 Feb 2006 23:28:21 +1100 | From | Nick Piggin <> | Subject | Re: [Patch 2/7] Add sysctl for schedstats |
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Shailabh Nagar wrote: > Nick Piggin wrote:
>> >> And clearing this at all is not really needed for the schedstats >> interface. >> You have a timestamp and a set of accumulated values, so it is easy to >> work >> out deltas. So do you need this? > > > Not clearing the stats will mean userspace has to distinguish between > the tasks > that are hanging around from before the last turn off, and the ones > created after > wards. Any delta taken across an interval where schedstats was turned > off will > give the impression a task was sleeping during the interval (and hence > show it had > a lesser average wait time than it might actually have experienced).
Presumably a delta taken acrsoss an interval where schedstats was turned off would be rather inaccurate, no matter what.
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