perf report: Fix --total-cycles --stdio output error

The --total-cycles may output wrong information with the --stdio.

For example:

  # perf record -e "{cycles,instructions}",cache-misses -b sleep 1
  # perf report --total-cycles --stdio

The total cycles output of {cycles,instructions} and cache-misses are
almost the same.

  # Samples: 938  of events 'anon group { cycles, instructions }'
  # Event count (approx.): 938
  #
  # Sampled Cycles%  Sampled Cycles  Avg Cycles%  Avg Cycles  [Program Block Range]
  # ...............  ..............  ...........  ..........  ..................................................>
  #
            11.19%            2.6K        0.10%           21  [perf_iterate_ctx+48 -> >
             5.79%            1.4K        0.45%           97  [__intel_pmu_enable_all.constprop.0+80 -> __intel_>
             5.11%            1.2K        0.33%           71  [native_write_msr+0 ->>

  # Samples: 293  of event 'cache-misses'
  # Event count (approx.): 293
  #
  # Sampled Cycles%  Sampled Cycles  Avg Cycles%  Avg Cycles  [Program Block Range]
  # ...............  ..............  ...........  ..........  ..................................................>
  #
            11.19%            2.6K        0.13%           21  [perf_iterate_ctx+48 -> >
             5.79%            1.4K        0.59%           97  [__intel_pmu_enable_all.constprop.0+80 -> __intel_>
             5.11%            1.2K        0.43%           71  [native_write_msr+0 ->>

With the symbol_conf.event_group, the 'perf report' should only report the
block information of the leader event in a group.

However, the current implementation retrieves the next event's block
information, rather than the next group leader's block information.

Make sure the index is updated even if the event is skipped.

With the patch,

  # Samples: 293  of event 'cache-misses'
  # Event count (approx.): 293
  #
  # Sampled Cycles%  Sampled Cycles  Avg Cycles%  Avg Cycles  [Program Block Range]
  # ...............  ..............  ...........  ..........  ..................................................>
  #
           37.98%            9.0K        4.05%           299  [perf_event_addr_filters_exec+0 -> perf_event_a>
           11.19%            2.6K        0.28%            21  [perf_iterate_ctx+48 -> >
            5.79%            1.4K        1.32%            97  [__intel_pmu_enable_all.constprop.0+80 -> __intel_>

Fixes: 6f7164fa231a5f36 ("perf report: Sort by sampled cycles percent per block for stdio")
Reviewed-by: Andi Kleen <[email protected]>
Signed-off-by: Kan Liang <[email protected]>
Acked-by: Namhyung Kim <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Ian Rogers <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jin Yao <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Stephane Eranian <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

0 files changed, 0 insertions, 0 deletions