linux-kernel - Re: [PATCH v6 0/5] perf stat: Support overall statistics for interval mode

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Message-ID: <20200520105406.GB157452@krava>
Date:   Wed, 20 May 2020 12:54:06 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Jin Yao <yao.jin@...ux.intel.com>
Cc:     acme@...nel.org, jolsa@...nel.org, peterz@...radead.org,
        mingo@...hat.com, alexander.shishkin@...ux.intel.com,
        Linux-kernel@...r.kernel.org, ak@...ux.intel.com,
        kan.liang@...el.com, yao.jin@...el.com
Subject: Re: [PATCH v6 0/5] perf stat: Support overall statistics for
 interval mode

On Wed, May 20, 2020 at 12:27:32PM +0800, Jin Yao wrote:
> Currently perf-stat supports to print counts at regular interval (-I),
> but it's not very easy for user to get the overall statistics.
> 
> With this patchset, it supports to report the summary at the end of
> interval output.
> 
> For example,
> 
>  root@...-ppc:~# perf stat -e cycles -I1000 --interval-count 2
>  #           time             counts unit events
>       1.000412064          2,281,114      cycles
>       2.001383658          2,547,880      cycles
> 
>   Performance counter stats for 'system wide':
> 
>           4,828,994      cycles
> 
>         2.002860349 seconds time elapsed
> 
>  root@...-ppc:~# perf stat -e cycles,instructions -I1000 --interval-count 2
>  #           time             counts unit events
>       1.000389902          1,536,093      cycles
>       1.000389902            420,226      instructions              #    0.27  insn per cycle
>       2.001433453          2,213,952      cycles
>       2.001433453            735,465      instructions              #    0.33  insn per cycle
> 
>   Performance counter stats for 'system wide':
> 
>           3,750,045      cycles
>           1,155,691      instructions              #    0.31  insn per cycle
> 
>         2.003023361 seconds time elapsed
> 
>  root@...-ppc:~# perf stat -M CPI,IPC -I1000 --interval-count 2
>  #           time             counts unit events
>       1.000435121            905,303      inst_retired.any          #      2.9 CPI
>       1.000435121          2,663,333      cycles
>       1.000435121            914,702      inst_retired.any          #      0.3 IPC
>       1.000435121          2,676,559      cpu_clk_unhalted.thread
>       2.001615941          1,951,092      inst_retired.any          #      1.8 CPI
>       2.001615941          3,551,357      cycles
>       2.001615941          1,950,837      inst_retired.any          #      0.5 IPC
>       2.001615941          3,551,044      cpu_clk_unhalted.thread
> 
>   Performance counter stats for 'system wide':
> 
>           2,856,395      inst_retired.any          #      2.2 CPI
>           6,214,690      cycles
>           2,865,539      inst_retired.any          #      0.5 IPC
>           6,227,603      cpu_clk_unhalted.thread
> 
>         2.003403078 seconds time elapsed
> 
>  v6:
>  ---
>  1. Add comments in perf_evlist__save_aggr_prev_raw_counts.
>  2. Move init_stats(&walltime_nsecs_stats) under interval condition check.
> 
>  Following patches are changed in v6.
>     perf stat: Save aggr value to first member of prev_raw_counts
>     perf stat: Report summary for interval mode

Reviewed-by: Jiri Olsa <jolsa@...hat.com>

thanks,
jirka