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| author | Namhyung Kim <namhyung@kernel.org> | 2017-06-18 17:23:02 +0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2017-06-20 04:05:54 +0300 |
| commit | 1096c35aa821cc4789a64232a0e210bb87a0e5e8 (patch) | |
| tree | e8c980a69b3b768e029da7850b077efc1110175b /tools/perf/Documentation | |
| parent | 78b83e8b12b4467540ca501c7c019e9d46051957 (diff) | |
| download | linux-1096c35aa821cc4789a64232a0e210bb87a0e5e8.tar.xz | |
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>
Diffstat (limited to 'tools/perf/Documentation')
| -rw-r--r-- | tools/perf/Documentation/perf-ftrace.txt | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/tools/perf/Documentation/perf-ftrace.txt b/tools/perf/Documentation/perf-ftrace.txt index 78d6126ca485..721a447f046e 100644 --- a/tools/perf/Documentation/perf-ftrace.txt +++ b/tools/perf/Documentation/perf-ftrace.txt @@ -78,6 +78,9 @@ OPTIONS This can be used more than once to specify multiple functions. It will be passed to 'set_graph_notrace' in tracefs. +-D:: +--graph-depth=:: + Set max depth for function graph tracer to follow SEE ALSO -------- |