• Kan Liang's avatar
    perf callchain: Allow disabling call graphs per event · f9db0d0f
    Kan Liang authored
    This patch introduce "call-graph=no" to disable per-event callgraph.
    
    Here is an example.
    
      perf record -e 'cpu/cpu-cycles,call-graph=fp/,cpu/instructions,call-graph=no/' sleep 1
    
      perf report --stdio
    
      # To display the perf.data header info, please use
      --header/--header-only options.
      #
      #
      # Total Lost Samples: 0
      #
      # Samples: 6  of event 'cpu/cpu-cycles,call-graph=fp/'
      # Event count (approx.): 774218
      #
      # Children      Self  Command  Shared Object     Symbol
      # ........  ........  .......  ................  ........................................
      #
        61.94%     0.00%  sleep    [kernel.vmlinux]  [k] entry_SYSCALL_64_fastpath
                  |
                  ---entry_SYSCALL_64_fastpath
                     |
                     |--97.30%-- __brk
                     |
                      --2.70%-- mmap64
                                _dl_check_map_versions
                                _dl_check_all_versions
    
        61.94%     0.00%  sleep    [kernel.vmlinux]  [k] perf_event_mmap
                  |
                  ---perf_event_mmap
                     |
                     |--97.30%-- do_brk
                     |          sys_brk
                     |          entry_SYSCALL_64_fastpath
                     |          __brk
                     |
                      --2.70%-- mmap_region
                                do_mmap_pgoff
                                vm_mmap_pgoff
                                sys_mmap_pgoff
                                sys_mmap
                                entry_SYSCALL_64_fastpath
                                mmap64
                                _dl_check_map_versions
                                _dl_check_all_versions
      ......
    
      # Samples: 6  of event 'cpu/instructions,call-graph=no/'
      # Event count (approx.): 359692
      #
      # Children      Self  Command  Shared Object     Symbol
      # ........  ........  .......  ................  .................................
      #
         89.03%     0.00%  sleep    [unknown]         [.] 0xffff6598ffff6598
         89.03%     0.00%  sleep    ld-2.17.so        [.] _dl_resolve_conflicts
         89.03%     0.00%  sleep    [kernel.vmlinux]  [k] page_fault
    Signed-off-by: default avatarKan Liang <kan.liang@intel.com>
    Tested-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
    Cc: Andi Kleen <ak@linux.intel.com>
    Cc: Jiri Olsa <jolsa@kernel.org>
    Cc: Namhyung Kim <namhyung@kernel.org>
    Link: http://lkml.kernel.org/r/1439289050-40510-2-git-send-email-kan.liang@intel.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
    f9db0d0f
builtin-diff.c 29.2 KB