linux-kernel - [PATCH 13/13] ANDROID: binder: Add tracing for binder priority inheritance.

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Date:   Fri, 25 Aug 2017 11:33:35 +0200
From:   Martijn Coenen <maco@...roid.com>
To:     gregkh@...uxfoundation.org, john.stultz@...aro.org,
        tkjos@...gle.com, arve@...roid.com, amit.pundir@...aro.org
Cc:     linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org,
        maco@...gle.com, malchev@...gle.com, ccross@...roid.com,
        Martijn Coenen <maco@...roid.com>
Subject: [PATCH 13/13] ANDROID: binder: Add tracing for binder priority inheritance.

This allows to easily trace and visualize priority inheritance
in the binder driver.

Change-Id: I8449ae4b002e55c5e9517a47f3581e05eef051d8
Signed-off-by: Martijn Coenen <maco@...roid.com>
---
 drivers/android/binder.c       |  4 ++++
 drivers/android/binder_trace.h | 24 ++++++++++++++++++++++++
 2 files changed, 28 insertions(+)

diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index 337c88fd675d..b29af3de6c34 100644
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -1153,6 +1153,10 @@ static void binder_do_set_priority(struct task_struct *task,
 			      task->pid, desired.prio,
 			      to_kernel_prio(policy, priority));
 
+	trace_binder_set_priority(task->tgid, task->pid, task->normal_prio,
+				  to_kernel_prio(policy, priority),
+				  desired.prio);
+
 	/* Set the actual priority */
 	if (task->policy != policy || is_rt_policy(policy)) {
 		struct sched_param params;
diff --git a/drivers/android/binder_trace.h b/drivers/android/binder_trace.h
index 7967db16ba5a..1e0169796d81 100644
--- a/drivers/android/binder_trace.h
+++ b/drivers/android/binder_trace.h
@@ -85,6 +85,30 @@ DEFINE_BINDER_FUNCTION_RETURN_EVENT(binder_ioctl_done);
 DEFINE_BINDER_FUNCTION_RETURN_EVENT(binder_write_done);
 DEFINE_BINDER_FUNCTION_RETURN_EVENT(binder_read_done);
 
+TRACE_EVENT(binder_set_priority,
+	TP_PROTO(int proc, int thread, unsigned int old_prio,
+		 unsigned int desired_prio, unsigned int new_prio),
+	TP_ARGS(proc, thread, old_prio, new_prio, desired_prio),
+
+	TP_STRUCT__entry(
+		__field(int, proc)
+		__field(int, thread)
+		__field(unsigned int, old_prio)
+		__field(unsigned int, new_prio)
+		__field(unsigned int, desired_prio)
+	),
+	TP_fast_assign(
+		__entry->proc = proc;
+		__entry->thread = thread;
+		__entry->old_prio = old_prio;
+		__entry->new_prio = new_prio;
+		__entry->desired_prio = desired_prio;
+	),
+	TP_printk("proc=%d thread=%d old=%d => new=%d desired=%d",
+		  __entry->proc, __entry->thread, __entry->old_prio,
+		  __entry->new_prio, __entry->desired_prio)
+);
+
 TRACE_EVENT(binder_wait_for_work,
 	TP_PROTO(bool proc_work, bool transaction_stack, bool thread_todo),
 	TP_ARGS(proc_work, transaction_stack, thread_todo),
-- 
2.14.1.480.gb18f417b89-goog