• He Kuang's avatar
    perf tools: Enable event_config terms to tracepoint events · e637d177
    He Kuang authored
    This patch enables config terms for tracepoint perf events. Valid terms
    for tracepoint events are 'call-graph' and 'stack-size', so we can use
    different callgraph settings for each event and eliminate unnecessary
    overhead.
    
    Here is an example for using different call-graph config for each
    tracepoint.
    
      $ perf record -e syscalls:sys_enter_write/call-graph=fp/
                    -e syscalls:sys_exit_write/call-graph=no/
                    dd if=/dev/zero of=test bs=4k count=10
    
      $ perf report --stdio
    
      #
      # Total Lost Samples: 0
      #
      # Samples: 13  of event 'syscalls:sys_enter_write'
      # Event count (approx.): 13
      #
      # Children      Self  Command  Shared Object       Symbol
      # ........  ........  .......  ..................  ......................
      #
          76.92%    76.92%  dd       libpthread-2.20.so  [.] __write_nocancel
                       |
                       ---__write_nocancel
    
          23.08%    23.08%  dd       libc-2.20.so        [.] write
                       |
                       ---write
                          |
                          |--33.33%-- 0x2031342820736574
                          |
                          |--33.33%-- 0xa6e69207364726f
                          |
                           --33.33%-- 0x34202c7320393039
      ...
    
      # Samples: 13  of event 'syscalls:sys_exit_write'
      # Event count (approx.): 13
      #
      # Children      Self  Command  Shared Object       Symbol
      # ........  ........  .......  ..................  ......................
      #
          76.92%    76.92%  dd       libpthread-2.20.so  [.] __write_nocancel
          23.08%    23.08%  dd       libc-2.20.so        [.] write
           7.69%     0.00%  dd       [unknown]           [.] 0x0a6e69207364726f
           7.69%     0.00%  dd       [unknown]           [.] 0x2031342820736574
           7.69%     0.00%  dd       [unknown]           [.] 0x34202c7320393039
    Signed-off-by: default avatarHe Kuang <hekuang@huawei.com>
    Acked-by: default avatarJiri Olsa <jolsa@kernel.org>
    Cc: Adrian Hunter <adrian.hunter@intel.com>
    Cc: Kan Liang <kan.liang@intel.com>
    Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
    Cc: Wang Nan <wangnan0@huawei.com>
    Cc: pi3orama@163.com
    Link: http://lkml.kernel.org/r/1443412336-120050-4-git-send-email-hekuang@huawei.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
    e637d177
parse-events.h 4.99 KB