Vince Weaver <vincent.weaver@maine.edu> writes:

> On Thu, 17 May 2018, Stefan Wahren wrote:
>
>> 
>> > Eric Anholt <eric@anholt.net> hat am 17. Mai 2018 um 15:17 geschrieben:
>> > 
>> > 
>> > The a53 and a7 counters seem to match up, so we advertise a7 so that
>> > arm32 can probe.
>
> so how closely did you look at the a53/a7 differences?  I see some major 
> differences, especially with the CPU_CYCLES event (0xff vs 0x11).

I'm a bit lost in the code, but it seemed like the 0xff was a
placeholder for a bit of special behavior, but that the cpu_cycles ->
ARMV7_PERFCTR_CLOCK_CYCLES mapping got you that same value in the end.