Messages in this thread | | | Date | Wed, 25 Jan 2017 16:33:01 +0100 | From | Peter Zijlstra <> | Subject | Re: [PATCH 2/2] perf,core: use parent avg sample period as child initial period |
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On Wed, Jan 18, 2017 at 08:21:02AM -0500, kan.liang@intel.com wrote: > From: Kan Liang <kan.liang@intel.com> > > perf brings additional overhead when monitoring the task which > frequently generates child task. > > When inheriting a event from parent task to child task, the > sample_period of original parent event (parent_event->parent) will be > assigned to child event as its initial period, which is usually the > default sample_period 1.
Why is that mostly 1? I would expect the parent event's sample_period to ramp up as well.
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