[PATCH v6 0/5] perf stat: Support overall statistics for interval mode

[Jin Yao]

Currently perf-stat supports to print counts at regular interval (-I),
but it's not very easy for user to get the overall statistics.

With this patchset, it supports to report the summary at the end of
interval output.

For example,

 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

 v6:
 ---
 1. Add comments in perf_evlist__save_aggr_prev_raw_counts.
 2. Move init_stats(&walltime_nsecs_stats) under interval condition check.

 Following patches are changed in v6.
    perf stat: Save aggr value to first member of prev_raw_counts
    perf stat: Report summary for interval mode

 v5:
 ---
 1. Create new patch "perf stat: Save aggr value to first member
    of prev_raw_counts".

 2. Call perf_evlist__save_aggr_prev_raw_counts to save aggr value
    to first member of prev_raw_counts for AGGR_GLOBAL. Then next,
    perf_stat_process_counter can create aggr values from per cpu
    values.

 Following patches are impacted in v5:
    perf stat: Copy counts from prev_raw_counts to evsel->counts
    perf stat: Save aggr value to first member of prev_raw_counts
    perf stat: Report summary for interval mode

 v4:
 ---
 1. Create runtime_stat_reset.

 2. Zero the aggr in perf_counts__reset and use it to reset
    prev_raw_counts.

 3. Move affinity setup and read_counter_cpu to a new function
    read_affinity_counters. It's only called when stat_config.summary
    is not set.

 v3:
 ---
 1. 'perf stat: Fix wrong per-thread runtime stat for interval mode'
    is a new patch which fixes an existing issue found in test.

 2. We use the prev_raw_counts for summary counts. Drop the summary_counts in v2.

 3. Fix some issues.

 v2:
 ---
 Rebase to perf/core branch

Jin Yao (5):
  perf stat: Fix wrong per-thread runtime stat for interval mode
  perf counts: Reset prev_raw_counts counts
  perf stat: Copy counts from prev_raw_counts to evsel->counts
  perf stat: Save aggr value to first member of prev_raw_counts
  perf stat: Report summary for interval mode

 tools/perf/builtin-stat.c | 101 +++++++++++++++++++++++++-------------
 tools/perf/util/counts.c  |   4 +-
 tools/perf/util/counts.h  |   1 +
 tools/perf/util/stat.c    |  53 +++++++++++++++++---
 tools/perf/util/stat.h    |   3 ++
 5 files changed, 122 insertions(+), 40 deletions(-)

-- 
2.17.1