RE: [PATCH V5 4/8] perf/x86/intel/uncore: add new data structures for free running counters

[Liang, Kan]

> 
> On Thu, Jan 18, 2018 at 05:43:10PM +0000, Liang, Kan wrote:
> > In the uncore document, there is no event-code assigned to free running
> counters.
> > Some events need to be defined to indicate the free running counters.
> > The events are encoded as event-code + umask-code.
> >
> > The event-code for all free running counters is 0xff, which is the
> > same as the fixed counters.
> 
> Is it possible to count the same things using the generic counters?
> 

Yes, there are events for generic counters to count bandwidth and
utilization.

The reasons of introducing free running counters are
- To provide highly valuable information (bandwidth and utilization)
   which most of the customers are interested in
- To save on the precious generic counters


Thanks,
Kan