• Anton Blanchard's avatar
    perf stat: Failure with "Operation not supported" · 38f6ae1e
    Anton Blanchard authored
    perf stat is failing on PowerPC:
    
      Error: open_counter returned with 95 (Operation not supported). /bin/dmesg may provide additional information.
    
      Fatal: Not all events could be opened.
    
    commit 370faf1d (perf stat: Fail softly on unsupported events)
    added a check for failure returning ENOENT, but the POWER backend
    returns EOPNOTSUPP. It looks like alpha, blackfin and mips do the
    same.
    
    With the patch applied, things work as expected:
    
     Performance counter stats for '/bin/true':
    
              0.362176 task-clock                #    0.623 CPUs utilized
                     0 context-switches          #    0.000 M/sec
                     0 CPU-migrations            #    0.000 M/sec
                    28 page-faults               #    0.077 M/sec
             1,677,020 cycles                    #    4.630 GHz
       <not supported> stalled-cycles-frontend
       <not supported> stalled-cycles-backend
               431,220 instructions              #    0.26  insns per cycle
               101,889 branches                  #  281.325 M/sec
                 4,145 branch-misses             #    4.07% of all branches
    
           0.000581361 seconds time elapsed
    
    Cc: <stable@kernel.org> # 3.0+
    Cc: David Ahern <dsahern@gmail.com>
    Cc: Frederic Weisbecker <fweisbec@gmail.com>
    Cc: Ingo Molnar <mingo@elte.hu>
    Cc: Paul Mackerras <paulus@samba.org>
    Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
    Link: http://lkml.kernel.org/r/20111202093833.5fef7226@krytenSigned-off-by: default avatarAnton Blanchard <anton@samba.org>
    Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
    38f6ae1e
builtin-stat.c 33.9 KB