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Subject[PATCH v2 2/3] sched/fair: do not expose some tracepoints to user if CONFIG_SCHEDSTATS is not set
Date
The tracepoints trace_sched_stat_{iowait, blocked, wait, sleep} should
be not exposed to user if CONFIG_SCHEDSTATS is not set.

Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
---
include/trace/events/sched.h | 21 ++++++++++++++-------
1 file changed, 14 insertions(+), 7 deletions(-)

diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h
index 9a4bdfa..c8c7c7e 100644
--- a/include/trace/events/sched.h
+++ b/include/trace/events/sched.h
@@ -241,7 +241,6 @@ static inline long __trace_sched_switch_state(bool preempt, struct task_struct *
DEFINE_EVENT(sched_process_template, sched_process_free,
TP_PROTO(struct task_struct *p),
TP_ARGS(p));
-

/*
* Tracepoint for a task exiting:
@@ -336,11 +335,20 @@ static inline long __trace_sched_switch_state(bool preempt, struct task_struct *
__entry->pid, __entry->old_pid)
);

+
+#ifdef CONFIG_SCHEDSTATS
+#define DEFINE_EVENT_SCHEDSTAT DEFINE_EVENT
+#define DECLARE_EVENT_CLASS_SCHEDSTAT DECLARE_EVENT_CLASS
+#else
+#define DEFINE_EVENT_SCHEDSTAT DEFINE_EVENT_NOP
+#define DECLARE_EVENT_CLASS_SCHEDSTAT DECLARE_EVENT_CLASS_NOP
+#endif
+
/*
* XXX the below sched_stat tracepoints only apply to SCHED_OTHER/BATCH/IDLE
* adding sched_stat support to SCHED_FIFO/RR would be welcome.
*/
-DECLARE_EVENT_CLASS(sched_stat_template,
+DECLARE_EVENT_CLASS_SCHEDSTAT(sched_stat_template,

TP_PROTO(struct task_struct *tsk, u64 delay),

@@ -363,12 +371,11 @@ static inline long __trace_sched_switch_state(bool preempt, struct task_struct *
(unsigned long long)__entry->delay)
);

-
/*
* Tracepoint for accounting wait time (time the task is runnable
* but not actually running due to scheduler contention).
*/
-DEFINE_EVENT(sched_stat_template, sched_stat_wait,
+DEFINE_EVENT_SCHEDSTAT(sched_stat_template, sched_stat_wait,
TP_PROTO(struct task_struct *tsk, u64 delay),
TP_ARGS(tsk, delay));

@@ -376,7 +383,7 @@ static inline long __trace_sched_switch_state(bool preempt, struct task_struct *
* Tracepoint for accounting sleep time (time the task is not runnable,
* including iowait, see below).
*/
-DEFINE_EVENT(sched_stat_template, sched_stat_sleep,
+DEFINE_EVENT_SCHEDSTAT(sched_stat_template, sched_stat_sleep,
TP_PROTO(struct task_struct *tsk, u64 delay),
TP_ARGS(tsk, delay));

@@ -384,14 +391,14 @@ static inline long __trace_sched_switch_state(bool preempt, struct task_struct *
* Tracepoint for accounting iowait time (time the task is not runnable
* due to waiting on IO to complete).
*/
-DEFINE_EVENT(sched_stat_template, sched_stat_iowait,
+DEFINE_EVENT_SCHEDSTAT(sched_stat_template, sched_stat_iowait,
TP_PROTO(struct task_struct *tsk, u64 delay),
TP_ARGS(tsk, delay));

/*
* Tracepoint for accounting blocked time (time the task is in uninterruptible).
*/
-DEFINE_EVENT(sched_stat_template, sched_stat_blocked,
+DEFINE_EVENT_SCHEDSTAT(sched_stat_template, sched_stat_blocked,
TP_PROTO(struct task_struct *tsk, u64 delay),
TP_ARGS(tsk, delay));

--
1.8.3.1
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