• Jin Yao's avatar
    perf stat: Report summary for interval mode · c7e5b328
    Jin Yao authored
    Currently 'perf stat' supports to print counts at regular interval (-I),
    but it's not very easy for user to get the overall statistics.
    
    The patch uses 'evsel->prev_raw_counts' to get counts for summary.  Copy
    the counts to 'evsel->counts' after printing the interval results.
    Next, we just follow the non-interval processing.
    
    Let's see some examples,
    
     root@kbl-ppc:~# perf stat -e cycles -I1000 --interval-count 2
     #           time             counts unit events
          1.000412064          2,281,114      cycles
          2.001383658          2,547,880      cycles
    
      Performance counter stats for 'system wide':
    
              4,828,994      cycles
    
            2.002860349 seconds time elapsed
    
     root@kbl-ppc:~# perf stat -e cycles,instructions -I1000 --interval-count 2
     #           time             counts unit events
          1.000389902          1,536,093      cycles
          1.000389902            420,226      instructions              #    0.27  insn per cycle
          2.001433453          2,213,952      cycles
          2.001433453            735,465      instructions              #    0.33  insn per cycle
    
      Performance counter stats for 'system wide':
    
              3,750,045      cycles
              1,155,691      instructions              #    0.31  insn per cycle
    
            2.003023361 seconds time elapsed
    
     root@kbl-ppc:~# perf stat -M CPI,IPC -I1000 --interval-count 2
     #           time             counts unit events
          1.000435121            905,303      inst_retired.any          #      2.9 CPI
          1.000435121          2,663,333      cycles
          1.000435121            914,702      inst_retired.any          #      0.3 IPC
          1.000435121          2,676,559      cpu_clk_unhalted.thread
          2.001615941          1,951,092      inst_retired.any          #      1.8 CPI
          2.001615941          3,551,357      cycles
          2.001615941          1,950,837      inst_retired.any          #      0.5 IPC
          2.001615941          3,551,044      cpu_clk_unhalted.thread
    
      Performance counter stats for 'system wide':
    
              2,856,395      inst_retired.any          #      2.2 CPI
              6,214,690      cycles
              2,865,539      inst_retired.any          #      0.5 IPC
              6,227,603      cpu_clk_unhalted.thread
    
            2.003403078 seconds time elapsed
    
    Committer testing:
    
    Before:
    
      # perf stat -e cycles -I1000 --interval-count 2
      #           time             counts unit events
           1.000618627         26,877,408      cycles
           2.001417968        233,672,829      cycles
      #
    
    After:
    
      # perf stat -e cycles -I1000 --interval-count 2
      #           time             counts unit events
           1.001531815      5,341,388,792      cycles
           2.002936530        100,073,912      cycles
    
       Performance counter stats for 'system wide':
    
           5,441,462,704      cycles
    
             2.004893794 seconds time elapsed
    
      #
    Signed-off-by: default avatarJin Yao <yao.jin@linux.intel.com>
    Reviewed-by: default avatarJiri Olsa <jolsa@redhat.com>
    Tested-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
    Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
    Cc: Andi Kleen <ak@linux.intel.com>
    Cc: Kan Liang <kan.liang@linux.intel.com>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Link: http://lore.kernel.org/lkml/20200520042737.24160-6-yao.jin@linux.intel.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
    c7e5b328
stat.c 13.1 KB