[Linux-Xtensa] [PATCH v2 07/13] xtensa: implement counting and sampling perf events

Max Filippov jcmvbkbc at gmail.com
Fri Aug 7 12:03:02 UTC 2015

On Fri, Aug 7, 2015 at 12:13 PM, Peter Zijlstra <peterz at infradead.org> wrote:
> On Thu, Aug 06, 2015 at 04:46:32PM -0300, Arnaldo Carvalho de Melo wrote:
>> Em Sat, Jul 18, 2015 at 11:30:10AM +0300, Max Filippov escreveu:
>> > Xtensa Performance Monitor Module has up to 8 32 bit wide performance
>> > counters. Each counter may be enabled independently and can count any
>> > single type of hardware performance events. Event counting may be enabled
>> > and disabled globally (per PMM).
>> > Each counter has status register with bits indicating if the counter has
>> > been overflown and may be programmed to raise profiling IRQ on overflow.
>> > This IRQ is used to rewind counters and allow for counting more than 2^32
>> > samples for counting events and to report samples for sampling events.
>> >
>> > For more details see Tensilica Debug User's Guide, chapter 8
>> > "Performance monitor module".
>> Has this gone via PeterZ? I added the tools/ bits in my perf/core
>> branch, will go in next pull req,
> I was thinking it would go through the xtensa tree. Looks fine at a
> quick glance and they can actually test it.

Right, had the same idea.

-- Max

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