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ftrace: Add 'function-fork' trace option

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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>
This commit is contained in:
Namhyung Kim
2017-04-17 11:44:28 +09:00
committed by Steven Rostedt (VMware)
parent b980b117c9
commit 1e10486ffe
3 changed files with 46 additions and 2 deletions
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5
kernel/trace/trace.c
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@@ -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