• Ingo Molnar's avatar
    perf tools: Implement counter output multiplexing · ea57c4f5
    Ingo Molnar authored
    Finish the -M/--multiplex option implementation:
    
     - separate it out from group_fd
    
     - correctly set it via the ioctl and dont mmap counters that
       are multiplexed
    
     - modify the perf record event loop to deal with buffer-less
       counters.
    
     - remove the -g option from perf sched record
    
     - account for unordered events in perf sched latency
    
     - (add -f to perf sched record to ease measurements)
    
     - skip idle threads (pid==0) in latency output
    
    The result is better latency output by 'perf sched latency':
    
     -----------------------------------------------------------------------------------
      Task              |  Runtime ms | Switches | Average delay ms | Maximum delay ms |
     -----------------------------------------------------------------------------------
      ksoftirqd/8       |    0.071 ms |        2 | avg:    0.458 ms | max:    0.913 ms |
      at-spi-registry   |    0.609 ms |       19 | avg:    0.013 ms | max:    0.023 ms |
      perf              |    3.316 ms |       16 | avg:    0.013 ms | max:    0.054 ms |
      Xorg              |    0.392 ms |       19 | avg:    0.011 ms | max:    0.018 ms |
      sleep             |    0.537 ms |        2 | avg:    0.009 ms | max:    0.009 ms |
     -----------------------------------------------------------------------------------
      TOTAL:            |    4.925 ms |       58 |
     ---------------------------------------------
    
    Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
    Cc: Mike Galbraith <efault@gmx.de>
    Cc: Paul Mackerras <paulus@samba.org>
    Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
    Cc: Frederic Weisbecker <fweisbec@gmail.com>
    LKML-Reference: <new-submission>
    Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
    ea57c4f5
trace-event-parse.c 58.5 KB