• Andi Kleen's avatar
    perf stat: Support JSON metrics in perf stat · b18f3e36
    Andi Kleen authored
    Add generic support for standalone metrics specified in JSON files to
    perf stat. A metric is a formula that uses multiple events to compute a
    higher level result (e.g. IPC).
    
    Previously metrics were always tied to an event and automatically
    enabled with that event. But now change it that we can have standalone
    metrics. They are in the same JSON data structure as events, but don't
    have an event name.
    
    We also allow to organize the metrics in metric groups, which allows a
    short cut to select several related metrics at once.
    
    Add a new -M / --metrics option to perf stat that adds the metrics or
    metric groups specified.
    
    Add the core code to manage and parse the metric groups. They are
    collected from the JSON data structures into a separate rblist.  When
    computing shadow values look for metrics in that list.  Then they are
    computed using the existing saved values infrastructure in stat-shadow.c
    
    The actual JSON metrics are in a separate pull request.
    
      % perf stat -M Summary --metric-only -a sleep 1
    
       Performance counter stats for 'system wide':
    
      Instructions   CLKS          CPU_Utilization  GFLOPs   SMT_2T_Utilization   Kernel_Utilization
      317614222.0    1392930775.0  0.0              0.0      0.2                  0.1
    
           1.001497549 seconds time elapsed
    
      % perf stat -M GFLOPs flops
    
       Performance counter stats for 'flops':
    
         3,999,541,471  fp_comp_ops_exe.sse_scalar_single #  1.2 GFLOPs   (66.65%)
                    14  fp_comp_ops_exe.sse_scalar_double                 (66.65%)
                     0  fp_comp_ops_exe.sse_packed_double                 (66.67%)
                     0  fp_comp_ops_exe.sse_packed_single                 (66.70%)
                     0  simd_fp_256.packed_double                         (66.70%)
                     0  simd_fp_256.packed_single                         (66.67%)
                     0  duration_time
    
           3.238372845 seconds time elapsed
    
    v2: Add missing header file
    v3: Move find_map to pmu.c
    Signed-off-by: default avatarAndi Kleen <ak@linux.intel.com>
    Acked-by: default avatarJiri Olsa <jolsa@kernel.org>
    Link: http://lkml.kernel.org/r/20170831194036.30146-7-andi@firstfloor.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
    b18f3e36
metricgroup.c 7.22 KB