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.
--
SUSE Labs, Novell Inc.
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