1. 20 Jun, 2024 39 commits
  2. 16 Jun, 2024 1 commit
    • Namhyung Kim's avatar
      perf hist: Honor symbol_conf.skip_empty · eae7044b
      Namhyung Kim authored
      So that it can skip events with no sample according to the config value.
      This can omit the dummy event in the output of perf report --group.
      
      An example output:
      
        $ sudo perf mem record -a sleep 1
        $ sudo perf report --group
      
      Before)
        #
        # Samples: 232  of events 'cpu/mem-loads,ldlat=30/P, cpu/mem-stores/P, dummy:u'
        # Event count (approx.): 3089861
        #
        #                 Overhead  Command      Shared Object      Symbol
        # ........................  ...........  .................  .....................................
        #
             9.29%   0.00%   0.00%  swapper      [kernel.kallsyms]  [k] update_blocked_averages
             5.26%   0.15%   0.00%  swapper      [kernel.kallsyms]  [k] __update_load_avg_se
             4.15%   0.00%   0.00%  perf-exec    [kernel.kallsyms]  [k] slab_update_freelist.isra.0
             3.87%   0.00%   0.00%  perf-exec    [kernel.kallsyms]  [k] memcg_slab_post_alloc_hook
             3.79%   0.17%   0.00%  swapper      [kernel.kallsyms]  [k] enqueue_task_fair
             3.63%   0.00%   0.00%  sleep        [kernel.kallsyms]  [k] next_uptodate_page
             2.86%   0.00%   0.00%  swapper      [kernel.kallsyms]  [k] __update_load_avg_cfs_rq
             2.78%   0.00%   0.00%  swapper      [kernel.kallsyms]  [k] __schedule
             2.34%   0.00%   0.00%  swapper      [kernel.kallsyms]  [k] intel_idle
             2.32%   0.97%   0.00%  swapper      [kernel.kallsyms]  [k] psi_group_change
      
      After)
        #
        # Samples: 232  of events 'cpu/mem-loads,ldlat=30/P, cpu/mem-stores/P'
        # Event count (approx.): 3089861
        #
        #         Overhead  Command      Shared Object      Symbol
        # ................  ...........  .................  .....................................
        #
             9.29%   0.00%  swapper      [kernel.kallsyms]  [k] update_blocked_averages
             5.26%   0.15%  swapper      [kernel.kallsyms]  [k] __update_load_avg_se
             4.15%   0.00%  perf-exec    [kernel.kallsyms]  [k] slab_update_freelist.isra.0
             3.87%   0.00%  perf-exec    [kernel.kallsyms]  [k] memcg_slab_post_alloc_hook
             3.79%   0.17%  swapper      [kernel.kallsyms]  [k] enqueue_task_fair
             3.63%   0.00%  sleep        [kernel.kallsyms]  [k] next_uptodate_page
             2.86%   0.00%  swapper      [kernel.kallsyms]  [k] __update_load_avg_cfs_rq
             2.78%   0.00%  swapper      [kernel.kallsyms]  [k] __schedule
             2.34%   0.00%  swapper      [kernel.kallsyms]  [k] intel_idle
             2.32%   0.97%  swapper      [kernel.kallsyms]  [k] psi_group_change
      
      Now it doesn't have a column for the dummy event.
      Tested-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      Signed-off-by: default avatarNamhyung Kim <namhyung@kernel.org>
      Link: https://lore.kernel.org/r/20240607202918.2357459-5-namhyung@kernel.org
      eae7044b