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SubjectRe: [PATCH v4 0/2] perf stat: Add interval-count and time support
On Mon, Jan 29, 2018 at 10:25:21AM +0100, ufo19890607 wrote:
> 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 v3:
> - merge interval_count check and times check to one line.
> - fix the wrong indent in stat.h
> - use stat_config.times instead of 'times' in cmd_stat function.

Acked-by: Jiri Olsa <jolsa@kernel.org>

thanks,
jirka

>
> 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 | 53 ++++++++++++++++++++++++++++++++--
> tools/perf/util/stat.h | 2 ++
> 3 files changed, 62 insertions(+), 3 deletions(-)
>
> --
> 2.14.1
>

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