Re: [PATCH] perf/x86/intel: Fix debug_store reset field for freq events

[Jiri Olsa]

On Fri, Jul 14, 2017 at 10:22:49AM -0700, Andi Kleen wrote:
> Jiri Olsa <jolsa@xxxxxxxxxx> writes:
> >
> > Setting the reset field to 0 for freq events.
> 
> Looks good to me.
> 
> Reviewed-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>
> 
> BTW I suspect there's a related bug that
> 
> perf record -e '{cycles:pp,branches}:S' ..
> 
> would enable multi record PEBS, even though it shouldn't because
> we need the PMI to read the other events.

there's PERF_SAMPLE_READ om cycles's sample_type for this example
so it won't pass the x86_pmu::free_running_flags filter

also PERF_SAMPLE_TIME and PERF_SAMPLE_PERIOD will be set
in your example which will prevent that, but those
could be unset via record's '-c xxxx' and '--no-timestamp'

jirka