> On Fri, Jan 19, 2018 at 03:15:00PM +0000, Liang, Kan wrote: > > > > > > 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 > > _IF_ the exact same counters are available on the GPs then we must use the > same event code for them and use event scheduling to place them on > fixed/free-running counters when possible.
OK. I will check if there are the exact same events on GPs for those free running counters. Thanks, Kan > > That's what we do for the CPU PMU's fixed counters too. > > Don't invent magic event codes just because.