linux-kernel - Re: [PATCH] perf stat: Display user and system time

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Date:   Tue, 5 Jun 2018 10:23:33 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Jiri Olsa <jolsa@...nel.org>
Cc:     linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        David Ahern <dsahern@...il.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        linux-perf-users@...r.kernel.org
Subject: Re: [PATCH] perf stat: Display user and system time

Em Tue, Jun 05, 2018 at 02:13:13PM +0200, Jiri Olsa escreveu:
> Adding the support to read rusage data once the
> workload is finished and display the system/user
> time values:
<SNIP>
> Those times are the very same displayed by 'time' tool.
> They are returned by wait4 call via the getrusage struct
> interface.

Thanks, tested it with:

      # perf stat --null time perf bench sched pipe
      # Running 'sched/pipe' benchmark:
      # Executed 1000000 pipe operations between two processes
    
           Total time: 5.526 [sec]
    
             5.526534 usecs/op
               180945 ops/sec
      1.00user 6.25system 0:05.52elapsed 131%CPU (0avgtext+0avgdata 8056maxresident)k
      0inputs+0outputs (0major+606minor)pagefaults 0swaps
    
       Performance counter stats for 'time perf bench sched pipe':
    
             5.530978744 seconds time elapsed
    
             1.004037000 seconds user
             6.259937000 seconds sys
    
      #

:-)

- Arnaldo