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| author | Namhyung Kim <namhyung@kernel.org> | 2017-04-17 11:44:28 +0900 |
|---|---|---|
| committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2017-04-17 17:13:00 -0400 |
| commit | 1e10486ffee0a5b060c58b9c8c712422f7b88b3b (patch) | |
| tree | 04dd3e900cf02e26033b976602f7ca78a467b84b /kernel/trace/trace.c | |
| parent | b980b117c9ff17226937128a15692a18c9a28ed6 (diff) | |
| download | lwn-1e10486ffee0a5b060c58b9c8c712422f7b88b3b.tar.gz lwn-1e10486ffee0a5b060c58b9c8c712422f7b88b3b.zip | |
ftrace: Add 'function-fork' trace option
The function-fork option is same as event-fork that it tracks task
fork/exit and set the pid filter properly. This can be useful if user
wants to trace selected tasks including their children only.
Link: http://lkml.kernel.org/r/20170417024430.21194-3-namhyung@kernel.org
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/trace.c')
| -rw-r--r-- | kernel/trace/trace.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index b5d4b80f2d45..8a5064a03ddf 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -257,7 +257,7 @@ unsigned long long ns2usecs(u64 nsec) /* trace_flags that are default zero for instances */ #define ZEROED_TRACE_FLAGS \ - TRACE_ITER_EVENT_FORK + (TRACE_ITER_EVENT_FORK | TRACE_ITER_FUNC_FORK) /* * The global_trace is the descriptor that holds the top-level tracing @@ -4205,6 +4205,9 @@ int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled) if (mask == TRACE_ITER_EVENT_FORK) trace_event_follow_fork(tr, enabled); + if (mask == TRACE_ITER_FUNC_FORK) + ftrace_pid_follow_fork(tr, enabled); + if (mask == TRACE_ITER_OVERWRITE) { ring_buffer_change_overwrite(tr->trace_buffer.buffer, enabled); #ifdef CONFIG_TRACER_MAX_TRACE |