[PATCH 0/4] perf stat: Enable group read of counters

[Jiri Olsa]

hi,
sending changes to enable group read of perf counters
for perf stat command. It allows us to read whole group
of counters within single read syscall.

Also available in here:
  git://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git
  perf/stat_group

Not sure why we haven't supported yet, but anyway it was
unavailable for some time due to a bug which was fixed
just recently via:
  ba5213ae6b88 ("perf/core: Correct event creation with PERF_FORMAT_GROUP")

thanks,
jirka


---
Jiri Olsa (4):
      perf tools: Add verbose output for sys_perf_event_open fallback
      perf tools: Add perf_evsel__read_size function
      perf tools: Add perf_evsel__read_counter function
      perf stat: Use group read for event groups

 tools/perf/builtin-stat.c |  30 +++++++++++++++++++---
 tools/perf/util/counts.h  |   1 +
 tools/perf/util/evsel.c   | 147 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 tools/perf/util/evsel.h   |   2 ++
 tools/perf/util/stat.c    |   3 +++
 tools/perf/util/stat.h    |   5 ++--
 6 files changed, 182 insertions(+), 6 deletions(-)