linux-kernel - Re: [PATCH v2 2/3] sched/fair: do not expose some tracepoints to user if CONFIG

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Date:   Tue, 26 Mar 2019 08:21:57 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Yafang Shao <laoar.shao@...il.com>
Cc:     mingo@...hat.com, peterz@...radead.org, paulmck@...ux.ibm.com,
        josh@...htriplett.org, mathieu.desnoyers@...icios.com,
        jiangshanlai@...il.com, joel@...lfernandes.org,
        linux-kernel@...r.kernel.org, shaoyafang@...iglobal.com
Subject: Re: [PATCH v2 2/3] sched/fair: do not expose some tracepoints to
 user if CONFIG_SCHEDSTATS is not set

Peter, Ingo,

Are you OK with this patch? If you ack it, I'll pull it in through my
tree.

-- Steve


On Tue, 26 Mar 2019 20:13:10 +0800
Yafang Shao <laoar.shao@...il.com> wrote:

> 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 | 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));
>