[for-next][PATCH 08/29] tracing: Show stacktrace for wakeup tracers

[Steven Rostedt]

From: Changbin Du <changbin.du@xxxxxxxxx>

This align the behavior of wakeup tracers with irqsoff latency tracer
that we record stacktrace at the beginning and end of waking up. The
stacktrace shows us what is happening in the kernel.

Link: http://lkml.kernel.org/r/20190116160249.7554-1-changbin.du@xxxxxxxxx

Signed-off-by: Changbin Du <changbin.du@xxxxxxxxx>
Signed-off-by: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx>
---
 kernel/trace/trace_sched_wakeup.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/trace/trace_sched_wakeup.c b/kernel/trace/trace_sched_wakeup.c
index da5b6e012840..f4fe7d1781e9 100644
--- a/kernel/trace/trace_sched_wakeup.c
+++ b/kernel/trace/trace_sched_wakeup.c
@@ -475,6 +475,7 @@ probe_wakeup_sched_switch(void *ignore, bool preempt,
 
 	__trace_function(wakeup_trace, CALLER_ADDR0, CALLER_ADDR1, flags, pc);
 	tracing_sched_switch_trace(wakeup_trace, prev, next, flags, pc);
+	__trace_stack(wakeup_trace, flags, 0, pc);
 
 	T0 = data->preempt_timestamp;
 	T1 = ftrace_now(cpu);
@@ -586,6 +587,7 @@ probe_wakeup(void *ignore, struct task_struct *p)
 	data = per_cpu_ptr(wakeup_trace->trace_buffer.data, wakeup_cpu);
 	data->preempt_timestamp = ftrace_now(cpu);
 	tracing_sched_wakeup_trace(wakeup_trace, p, current, flags, pc);
+	__trace_stack(wakeup_trace, flags, 0, pc);
 
 	/*
 	 * We must be careful in using CALLER_ADDR2. But since wake_up
-- 
2.20.1