From: Changbin Du <changbin.du@gmail.com>
To: rostedt@goodmis.org
Cc: mingo@redhat.com, corbet@lwn.net, linux-doc@vger.kernel.org,
linux-kernel@vger.kernel.org, Changbin Du <changbin.du@gmail.com>
Subject: [PATCH v2] sched/tracing: Show stacktrace for wakeup tracers
Date: Thu, 17 Jan 2019 00:02:49 +0800 [thread overview]
Message-ID: <20190116160249.7554-1-changbin.du@gmail.com> (raw)
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.
Signed-off-by: Changbin Du <changbin.du@gmail.com>
---
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
--
2.17.1
next reply other threads:[~2019-01-16 16:03 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-16 16:02 Changbin Du [this message]
2019-01-16 21:05 ` [PATCH v2] sched/tracing: Show stacktrace for wakeup tracers Steven Rostedt
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