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SubjectRe: [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@gmail.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@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));
>

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