diff options
| author | Namhyung Kim <namhyung@kernel.org> | 2024-07-28 17:41:24 -0700 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2024-07-31 16:58:18 -0300 |
| commit | c77800894b5a7d7d37b83862fd732230c5c3e518 (patch) | |
| tree | 8825f0c288a633234e40c1936ed77412760e6502 /tools/perf/Documentation | |
| parent | 156e8dcfeceebce0694fb00542ac68e61a785fe1 (diff) | |
perf ftrace: Add 'tail' option to --graph-opts
The 'graph-tail' option is to print function name as a comment at the end.
This is useful when a large function is mixed with other functions
(possibly from different CPUs).
For example,
$ sudo perf ftrace -- perf stat true
...
1) | get_unused_fd_flags() {
1) | alloc_fd() {
1) 0.178 us | _raw_spin_lock();
1) 0.187 us | expand_files();
1) 0.169 us | _raw_spin_unlock();
1) 1.211 us | }
1) 1.503 us | }
$ sudo perf ftrace --graph-opts tail -- perf stat true
...
1) | get_unused_fd_flags() {
1) | alloc_fd() {
1) 0.099 us | _raw_spin_lock();
1) 0.083 us | expand_files();
1) 0.081 us | _raw_spin_unlock();
1) 0.601 us | } /* alloc_fd */
1) 0.751 us | } /* get_unused_fd_flags */
Reviewed-by: Ian Rogers <irogers@google.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Changbin Du <changbin.du@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Link: https://lore.kernel.org/lkml/20240729004127.238611-2-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 | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/tools/perf/Documentation/perf-ftrace.txt b/tools/perf/Documentation/perf-ftrace.txt index d780b93fcf87..7ea1645a13cf 100644 --- a/tools/perf/Documentation/perf-ftrace.txt +++ b/tools/perf/Documentation/perf-ftrace.txt @@ -125,6 +125,7 @@ OPTIONS for 'perf ftrace trace' - verbose - Show process names, PIDs, timestamps, etc. - thresh=<n> - Setup trace duration threshold in microseconds. - depth=<n> - Set max depth for function graph tracer to follow. + - tail - Print function name at the end. OPTIONS for 'perf ftrace latency' |