linux-kernel - Re: [PATCH] perf stat: Show percore counts in per CPU output

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Message-ID: <20200210132804.GA9922@krava>
Date:   Mon, 10 Feb 2020 14:28:04 +0100
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] perf stat: Show percore counts in per CPU output

On Thu, Feb 06, 2020 at 09:56:13AM +0800, Jin Yao wrote:
> We have supported the event modifier "percore" which sums up the
> event counts for all hardware threads in a core and show the counts
> per core.
> 
> For example,
> 
>  # perf stat -e cpu/event=cpu-cycles,percore/ -a -A -- sleep 1
> 
>   Performance counter stats for 'system wide':
> 
>  S0-D0-C0                395,072      cpu/event=cpu-cycles,percore/
>  S0-D0-C1                851,248      cpu/event=cpu-cycles,percore/
>  S0-D0-C2                954,226      cpu/event=cpu-cycles,percore/
>  S0-D0-C3              1,233,659      cpu/event=cpu-cycles,percore/
> 
> This patch provides a new option "--percore-show-thread". It is
> used with event modifier "percore" together to sum up the event counts
> for all hardware threads in a core but show the counts per hardware
> thread.
> 
> For example,
> 
>  # perf stat -e cpu/event=cpu-cycles,percore/ -a -A --percore-show-thread  -- sleep 1
> 
>   Performance counter stats for 'system wide':
> 
>  CPU0               2,453,061      cpu/event=cpu-cycles,percore/
>  CPU1               1,823,921      cpu/event=cpu-cycles,percore/
>  CPU2               1,383,166      cpu/event=cpu-cycles,percore/
>  CPU3               1,102,652      cpu/event=cpu-cycles,percore/
>  CPU4               2,453,061      cpu/event=cpu-cycles,percore/
>  CPU5               1,823,921      cpu/event=cpu-cycles,percore/
>  CPU6               1,383,166      cpu/event=cpu-cycles,percore/
>  CPU7               1,102,652      cpu/event=cpu-cycles,percore/

I don't understand how is this different from -A output:

  # ./perf stat -e cpu/event=cpu-cycles/ -A  
  ^C
   Performance counter stats for 'system wide':

  CPU0              56,847,497      cpu/event=cpu-cycles/                                       
  CPU1              75,274,384      cpu/event=cpu-cycles/                                       
  CPU2              63,866,342      cpu/event=cpu-cycles/                                       
  CPU3              89,559,693      cpu/event=cpu-cycles/                                       
  CPU4              74,761,132      cpu/event=cpu-cycles/                                       
  CPU5              76,320,191      cpu/event=cpu-cycles/                                       
  CPU6              55,100,175      cpu/event=cpu-cycles/                                       
  CPU7              48,472,895      cpu/event=cpu-cycles/                                       

       1.074800857 seconds time elapsed

also the interval output is mangled:

  # ./perf stat -e cpu/event=cpu-cycles,percore/ -a -A --percore-show-thread  -I 1000
  #           time CPU                    counts unit events
     1.000177375      1.000177375 CPU0             138,483,540      cpu/event=cpu-cycles,percore/                                   
     1.000177375      1.000177375 CPU1             143,159,477      cpu/event=cpu-cycles,percore/                                   
     1.000177375      1.000177375 CPU2             177,554,642      cpu/event=cpu-cycles,percore/                                   
     1.000177375      1.000177375 CPU3             150,974,512      cpu/event=cpu-cycles,percore/                                   
     1.000177375      1.000177375 CPU4             138,483,540      cpu/event=cpu-cycles,percore/                                   
     1.000177375      1.000177375 CPU5             143,159,477      cpu/event=cpu-cycles,percore/                                   
     1.000177375      1.000177375 CPU6             177,554,642      cpu/event=cpu-cycles,percore/                                   

jirka