perf ftrace: Add -D option for depth filter
authorNamhyung Kim <namhyung@kernel.org>
Sun, 18 Jun 2017 14:23:02 +0000 (23:23 +0900)
committerArnaldo Carvalho de Melo <acme@redhat.com>
Tue, 20 Jun 2017 01:05:54 +0000 (22:05 -0300)
commit1096c35aa821cc4789a64232a0e210bb87a0e5e8
treee8c980a69b3b768e029da7850b077efc1110175b
parent78b83e8b12b4467540ca501c7c019e9d46051957
perf ftrace: Add -D option for depth filter

The -D/--graph-depth option is to set max graph depth.  The following
example traces max 2-depth of page fault handler.

  $ sudo perf ftrace -G __do_page_fault -D 2 -- hello
   ...
   0)               |  __do_page_fault() {
   0)   0.063 us    |    down_read_trylock();
   0)   0.251 us    |    find_vma();
   0)   5.374 us    |    handle_mm_fault();
   0)   0.054 us    |    up_read();
   0)   7.463 us    |  }
   ...

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: kernel-team@lge.com
Link: http://lkml.kernel.org/r/20170618142302.25390-4-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
tools/perf/Documentation/perf-ftrace.txt
tools/perf/builtin-ftrace.c