[RFC][PATCH 5/5] [PATCH 5/5] tracing/events: Add sched_migrate_task stable event

[Steven Rostedt <rostedt@goodmis.org>]

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From: Steven Rostedt <srostedt@redhat.com>

Add the stable event for sched_migrate_task.

[root@bxf ~]# cat /sys/kernel/event/sched_migrate_task/format
	array:comm	type:char	size:8	count:16	align:1	signed:1;
	field:pid	type:pid_t	size:32	align:4	signed:1;
	field:orig_cpu	type:int	size:32	align:4	signed:1;
	field:dest_cpu	type:int	size:32	align:4	signed:1;

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
 include/trace/stable/sched.h |   13 +++++++++++++
 kernel/events/events.c       |   10 ++++++++++
 2 files changed, 23 insertions(+), 0 deletions(-)

diff --git a/include/trace/stable/sched.h b/include/trace/stable/sched.h
index b5f4fd7..55d0e6f 100644
--- a/include/trace/stable/sched.h
+++ b/include/trace/stable/sched.h
@@ -17,4 +17,17 @@ STABLE_EVENT(sched_switch,
 	)
 );
 
+/*
+ * Tracepoint for a task being migrated:
+ */
+STABLE_EVENT(sched_migrate_task,
+
+	EVENT_STRUCT(
+		__array(	char,	comm,	TASK_COMM_LEN	)__SEP__
+		__field(	pid_t,	pid			)__SEP__
+		__field(	int,	orig_cpu		)__SEP__
+		__field(	int,	dest_cpu		)
+	)
+);
+
 #endif /* _STABLE_SCHED_H */
diff --git a/kernel/events/events.c b/kernel/events/events.c
index f69e720..6ca2d2d 100644
--- a/kernel/events/events.c
+++ b/kernel/events/events.c
@@ -35,4 +35,14 @@ static void hook_sched_switch(void *ignore,
 				  next->comm, next->pid);
 }
 
+DECLARE_TRACE(stable_sched_migrate_task,
+	      TP_PROTO(char *comm, pid_t pid, int orig_cpu, int dest_cpu),
+	      TP_ARGS(comm, pid, orig_cpu, dest_cpu));
+DEFINE_TRACE(stable_sched_migrate_task);
+
+static void hook_sched_migrate_task(void *ignore, struct task_struct *p, int dest_cpu)
+{
+	trace_stable_sched_migrate_task(p->comm, p->pid, task_cpu(p), dest_cpu);
+}
+
 #include "event_reg.h"
-- 
1.7.1