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The -T/--trace-funcs and -N/--notrace-funcs options are to specify
functions to enable/disable tracing dynamically.
The -G/--graph-funcs and -g/--nograph-funcs options are to set filters
for function graph tracer.
For example, to trace fault handling functions only:
$ sudo perf ftrace -T *fault hello
0) | __do_page_fault() {
0) | handle_mm_fault() {
0) 2.117 us | __handle_mm_fault();
0) 3.627 us | }
0) 7.811 us | }
0) | __do_page_fault() {
0) | handle_mm_fault() {
0) 2.014 us | __handle_mm_fault();
0) 2.424 us | }
0) 2.951 us | }
...
To trace all functions executed in __do_page_fault:
$ sudo perf ftrace -G __do_page_fault hello
2) | __do_page_fault() {
3) 0.060 us | down_read_trylock();
3) | find_vma() {
3) 0.075 us | vmacache_find();
3) 0.053 us | vmacache_update();
3) 1.246 us | }
3) | handle_mm_fault() {
3) 0.063 us | __rcu_read_lock();
3) 0.056 us | mem_cgroup_from_task();
3) 0.057 us | __rcu_read_unlock();
3) | __handle_mm_fault() {
3) | filemap_map_pages() {
3) 0.058 us | __rcu_read_lock();
3) | alloc_set_pte() {
...
But don't want to show details in handle_mm_fault:
$ sudo perf ftrace -G __do_page_fault -g handle_mm_fault hello
3) | __do_page_fault() {
3) 0.049 us | down_read_trylock();
3) | find_vma() {
3) 0.048 us | vmacache_find();
3) 0.041 us | vmacache_update();
3) 0.680 us | }
3) 0.036 us | up_read();
3) 4.547 us | } /* __do_page_fault */
...
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/20170618142302.25390-3-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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