Commit-ID: a8027073eb127cd207070891374b5c54c2ce3d23
Gitweb: http://git.kernel.org/tip/a8027073eb127cd207070891374b5c54c2ce3d23
Author: Steven Rostedt <srostedt@xxxxxxxxxx>
AuthorDate: Mon, 20 Sep 2010 15:13:34 -0400
Committer: Steven Rostedt <rostedt@xxxxxxxxxxx>
CommitDate: Tue, 21 Sep 2010 10:56:41 -0400
tracing/sched: Add sched_pi_setprio tracepoint
Add a tracepoint that shows the priority of a task being boosted
via priority inheritance.
Cc: Gregory Haskins <ghaskins@xxxxxxxxxx>
Acked-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
---
include/trace/events/sched.h | 29 +++++++++++++++++++++++++++++
kernel/sched.c | 1 +
2 files changed, 30 insertions(+), 0 deletions(-)
diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h
index 9208c92..f633478 100644
--- a/include/trace/events/sched.h
+++ b/include/trace/events/sched.h
@@ -362,6 +362,35 @@ TRACE_EVENT(sched_stat_runtime,
(unsigned long long)__entry->vruntime)
);
+/*
+ * Tracepoint for showing priority inheritance modifying a tasks
+ * priority.
+ */
+TRACE_EVENT(sched_pi_setprio,
+
+ TP_PROTO(struct task_struct *tsk, int newprio),
+
+ TP_ARGS(tsk, newprio),
+
+ TP_STRUCT__entry(
+ __array( char, comm, TASK_COMM_LEN )
+ __field( pid_t, pid )
+ __field( int, oldprio )
+ __field( int, newprio )
+ ),
+
+ TP_fast_assign(
+ memcpy(__entry->comm, tsk->comm, TASK_COMM_LEN);
+ __entry->pid = tsk->pid;
+ __entry->oldprio = tsk->prio;
+ __entry->newprio = newprio;
+ ),
+
+ TP_printk("comm=%s pid=%d oldprio=%d newprio=%d",
+ __entry->comm, __entry->pid,
+ __entry->oldprio, __entry->newprio)
+);
+
#endif /* _TRACE_SCHED_H */
/* This part must be outside protection */
diff --git a/kernel/sched.c b/kernel/sched.c
index 9ca8ad0..4ad4738 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -4355,6 +4355,7 @@ void rt_mutex_setprio(struct task_struct *p, int prio)
rq = task_rq_lock(p, &flags);
+ trace_sched_pi_setprio(p, prio);
oldprio = p->prio;
prev_class = p->sched_class;
on_rq = p->se.on_rq;
--
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