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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@novell.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt 2010-09-20 15:13:34 -04:00 committed by Steven Rostedt
parent b3bc211cfe
commit a8027073eb
2 changed files with 30 additions and 0 deletions
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29
include/trace/events/sched.h
View File

@ -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 */

1
kernel/sched.c
View File

@ -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;