• Kan Liang's avatar
    perf report: Show call graph from reference events · 9e207ddf
    Kan Liang authored
    Introduce --show-ref-call-graph for perf report to print reference
    callgraph for no callgraph event.
    
    Here is an example.
    
     perf report --show-ref-call-graph --stdio
    
     # To display the perf.data header info, please use
     --header/--header-only options.
     #
     #
     # Total Lost Samples: 0
     #
     # Samples: 5  of event 'cpu/cpu-cycles,call-graph=fp/'
     # Event count (approx.): 144985
     #
     # Children      Self  Command  Shared Object     Symbol
     # ........  ........  .......  ................  ........................................
     #
        72.30%     0.00%  sleep    [kernel.vmlinux]  [k] entry_SYSCALL_64_fastpath
                  |
                  ---entry_SYSCALL_64_fastpath
                     |
                     |--22.62%-- __GI___libc_nanosleep
                      --77.38%-- [...]
    
    ......
    
     # Samples: 6  of event 'cpu/instructions,call-graph=no/', show reference callgraph
     # Event count (approx.): 172780
     #
     # Children      Self  Command  Shared Object     Symbol
     # ........  ........  .......  ................  ........................................
     #
        73.16%     0.00%  sleep    [kernel.vmlinux]  [k] entry_SYSCALL_64_fastpath
                  |
                  ---entry_SYSCALL_64_fastpath
                     |
                     |--31.44%-- __GI___libc_nanosleep
                      --68.56%-- [...]
    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/1439289050-40510-3-git-send-email-kan.liang@intel.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
    9e207ddf
hists.c 55.4 KB