Messages in this thread |  | | From | ufo19890607 <> | Subject | [PATCH v3 0/2] perf stat: Add interval-count and time support | Date | Fri, 26 Jan 2018 10:06:55 +0100 |
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From: yuzhoujian <yuzhoujian@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
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