linux-kernel - [PATCH 2/3] sched/fair: do not expose some tracepoints to user if CONFIG

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Date:   Tue, 26 Mar 2019 09:40:06 +0800
From:   Yafang Shao <laoar.shao@...il.com>
To:     rostedt@...dmis.org, mingo@...hat.com, peterz@...radead.org,
        paulmck@...ux.vnet.ibm.com, josh@...htriplett.org,
        mathieu.desnoyers@...icios.com, jiangshanlai@...il.com,
        joel@...lfernandes.org
Cc:     shaoyafang@...iglobal.com, linux-kernel@...r.kernel.org,
        Yafang Shao <laoar.shao@...il.com>
Subject: [PATCH 2/3] sched/fair: do not expose some tracepoints to user if CONFIG_SCHEDSTATS is not set

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@...il.com>
---
 include/trace/events/sched.h | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h
index 9a4bdfa..4686c7f 100644
--- a/include/trace/events/sched.h
+++ b/include/trace/events/sched.h
@@ -336,6 +336,7 @@ static inline long __trace_sched_switch_state(bool preempt, struct task_struct *
 		  __entry->pid, __entry->old_pid)
 );
 
+#ifdef CONFIG_SCHEDSTATS
 /*
  * XXX the below sched_stat tracepoints only apply to SCHED_OTHER/BATCH/IDLE
  *     adding sched_stat support to SCHED_FIFO/RR would be welcome.
@@ -395,6 +396,19 @@ static inline long __trace_sched_switch_state(bool preempt, struct task_struct *
 	     TP_PROTO(struct task_struct *tsk, u64 delay),
 	     TP_ARGS(tsk, delay));
 
+#else /* CONFIG_SCHEDSTATS */
+
+TRACE_EVENT_NONE(sched_stat_wait,
+		 TP_PROTO(struct task_struct *tsk, u64 delay));
+TRACE_EVENT_NONE(sched_stat_sleep,
+		 TP_PROTO(struct task_struct *tsk, u64 delay));
+TRACE_EVENT_NONE(sched_stat_iowait,
+		 TP_PROTO(struct task_struct *tsk, u64 delay));
+TRACE_EVENT_NONE(sched_stat_blocked,
+		 TP_PROTO(struct task_struct *tsk, u64 delay));
+
+#endif /* CONFIG_SCHEDSTATS */
+
 /*
  * Tracepoint for accounting runtime (time the task is executing
  * on a CPU).
-- 
1.8.3.1