linux-kernel - Re: [PATCH v4 0/2] perf stat: Add interval-count and time support

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Date:   Mon, 29 Jan 2018 11:25:58 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     ufo19890607 <ufo19890607@...il.com>
Cc:     peterz@...radead.org, mingo@...hat.com,
        alexander.shishkin@...ux.intel.com, jolsa@...nel.org,
        dsahern@...il.com, namhyung@...nel.org, milian.wolff@...b.com,
        arnaldo.melo@...il.com, yuzhoujian@...ichuxing.com,
        adrian.hunter@...el.com, wangnan0@...wei.com, Kan.liang@...el.com,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        acme@...hat.com
Subject: Re: [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@...ichuxing.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@...nel.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
>