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tracing: Show stacktrace for wakeup tracers 

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@gmail.com

Signed-off-by: Changbin Du <changbin.du@gmail.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Changbin Du 2019-01-17 00:02:49 +08:00 committed by Steven Rostedt (VMware)
parent 88d380eb06
commit f52d569f3d
1 changed files with 2 additions and 0 deletions
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2
kernel/trace/trace_sched_wakeup.c
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@ -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