From: yuzhoujian <yuzhouj...@didichuxing.com>
Introduce two new options for perf stat and update perf-stat documentation
accordingly.
The interval-count option can be used to print counts for fixed number of
times, and it should be used specifically with "-I" option.
Show below is the output of the interval-count option for perf stat.
$ perf stat -I 1000 --interval-count 2 -e cycles -a
# time counts unit events
1.002827089 93,884,870 cycles
2.004231506 56,573,446 cycles
The time option can be used to print counts after a period of time, and it
should not be used with "-I" option.
Show below is the output of the time option for perf stat.
$ perf stat --time 2000 -e cycles -a
Performance counter stats for 'system wide':
157,260,423 cycles
2.003060766 seconds time elapsed
yuzhoujian (2):
perf stat: Add support to print counts for fixed times
perf stat: Add support to print counts after a period of time
Changes since v2:
- modify the time check in __run_perf_stat func to keep some consistency
with the workload case.
- add the warning when the time is set between 10ms to 100ms.
- add the pr_err when the time is set below 10ms.
Changes since v1:
- change the name of the new option "times-print" to "interval-count".
- keep the interval-count option interval specifically.
tools/perf/Documentation/perf-stat.txt | 10 ++++++
tools/perf/builtin-stat.c | 59 ++++++++++++++++++++++++++++++++--
tools/perf/util/stat.h | 2 ++
3 files changed, 68 insertions(+), 3 deletions(-)
--
2.14.1
