Re: How about limiting refresh ioctl to sampling events ?

[Francis Moreau <francis.moro@gmail.com>]

Peter Zijlstra <a.p.zijlstra@chello.nl> writes:

[...]

>> I'm also wondering if you would accept a second patch which will
>> introduce:
>> 
>> static inline bool is_sampling_event(struct perf_event *event)
>> {
>>         return event->attr.sample_period != 0;
>> }
>> 
>> That would make the code slighlty easier to read IMHO.
>> 
>
> Sure, Francis might want that too, he found another something like this.

Yes there's another issue when counting events are used: they call
perf_event_output() when 'period_left' gets 0 where as they should not.

-- 
Francis