On Sat, Aug 8, 2020 at 4:22 AM Jiri Olsa <jo...@redhat.com> wrote: > > On Fri, Aug 07, 2020 at 05:05:17PM -0600, Rob Herring wrote: > > x86 and arm64 can both support direct access of event counters in > > userspace. The access sequence is less than trivial and currently exists > > in perf test code (tools/perf/arch/x86/tests/rdpmc.c) with copies in > > projects such as PAPI and libpfm4. > > > > Patches to add arm64 userspace support are pending[1]. > > > > For this RFC, looking for a yes, seems like a good idea, or no, go away we > > don't want this in libperf. > > hi, > looks great! > > I wanted to add this for very long time.. so yes, we want this ;-)
Thanks for the quick feedback. Would this be better implemented as a fast path for perf_evsel__read()? If so, how to get the mmap data which is associated with a evlist rather than a evsel? Rob
