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(-)
