[PATCH v6 2/3] binder: add trace at free transaction.

[Frankie Chang]

From: "Frankie.Chang" <Frankie.Chang at mediatek.com>

Since the original trace_binder_transaction_received cannot
precisely present the real finished time of transaction, adding a
trace_binder_txn_latency_free at the point of free transaction
may be more close to it.

Signed-off-by: Frankie.Chang <Frankie.Chang at mediatek.com>
---
 drivers/android/binder.c       |    6 ++++++
 drivers/android/binder_trace.h |   27 +++++++++++++++++++++++++++
 2 files changed, 33 insertions(+)

diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index 2df146f..1e6fc40 100644
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -1522,6 +1522,9 @@ static void binder_free_transaction(struct binder_transaction *t)
 	 * If the transaction has no target_proc, then
 	 * t->buffer->transaction has already been cleared.
 	 */
+	spin_lock(&t->lock);
+	trace_binder_txn_latency_free(t);
+	spin_unlock(&t->lock);
 	binder_free_txn_fixups(t);
 	kfree(t);
 	binder_stats_deleted(BINDER_STAT_TRANSACTION);
@@ -3093,6 +3096,9 @@ static void binder_transaction(struct binder_proc *proc,
 	kfree(tcomplete);
 	binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
 err_alloc_tcomplete_failed:
+	spin_lock(&t->lock);
+	trace_binder_txn_latency_free(t);
+	spin_unlock(&t->lock);
 	kfree(t);
 	binder_stats_deleted(BINDER_STAT_TRANSACTION);
 err_alloc_t_failed:
diff --git a/drivers/android/binder_trace.h b/drivers/android/binder_trace.h
index 6731c3c..8ac87d1 100644
--- a/drivers/android/binder_trace.h
+++ b/drivers/android/binder_trace.h
@@ -95,6 +95,33 @@
 		  __entry->thread_todo)
 );
 
+TRACE_EVENT(binder_txn_latency_free,
+	TP_PROTO(struct binder_transaction *t),
+	TP_ARGS(t),
+	TP_STRUCT__entry(
+		__field(int, debug_id)
+		__field(int, from_proc)
+		__field(int, from_thread)
+		__field(int, to_proc)
+		__field(int, to_thread)
+		__field(unsigned int, code)
+		__field(unsigned int, flags)
+	),
+	TP_fast_assign(
+		__entry->debug_id = t->debug_id;
+		__entry->from_proc = t->from ? t->from->proc->pid : 0;
+		__entry->from_thread = t->from ? t->from->pid : 0;
+		__entry->to_proc = t->to_proc ? t->to_proc->pid : 0;
+		__entry->to_thread = t->to_thread ? t->to_thread->pid : 0;
+		__entry->code = t->code;
+		__entry->flags = t->flags;
+	),
+	TP_printk("transaction=%d from %d:%d to %d:%d flags=0x%x code=0x%x",
+		  __entry->debug_id, __entry->from_proc, __entry->from_thread,
+		  __entry->to_proc, __entry->to_thread, __entry->code,
+		  __entry->flags)
+);
+
 TRACE_EVENT(binder_transaction,
 	TP_PROTO(bool reply, struct binder_transaction *t,
 		 struct binder_node *target_node),
-- 
1.7.9.5