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charset="utf-8" Add scheduler stat to record number of times the thread was granted cpu time slice extension. Signed-off-by: Prakash Sangappa --- include/linux/sched.h | 7 +++++++ kernel/rseq.c | 1 + kernel/sched/core.c | 7 +++++++ kernel/sched/debug.c | 4 ++++ 4 files changed, 19 insertions(+) diff --git a/include/linux/sched.h b/include/linux/sched.h index a0661f1d423b..90d7989a0185 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -339,6 +339,9 @@ extern void io_schedule_finish(int token); extern long io_schedule_timeout(long timeout); extern void io_schedule(void); extern void hrtick_local_start(u64 delay); +#ifdef CONFIG_RSEQ +extern void update_stat_preempt_delayed(struct task_struct *t); +#endif =20 /* wrapper function to trace from this header file */ DECLARE_TRACEPOINT(sched_set_state_tp); @@ -569,6 +572,10 @@ struct sched_statistics { u64 nr_wakeups_passive; u64 nr_wakeups_idle; =20 +#ifdef CONFIG_RSEQ + u64 nr_preempt_delay_granted; +#endif + #ifdef CONFIG_SCHED_CORE u64 core_forceidle_sum; #endif diff --git a/kernel/rseq.c b/kernel/rseq.c index 545123ca60b0..99aa263c3a07 100644 --- a/kernel/rseq.c +++ b/kernel/rseq.c @@ -475,6 +475,7 @@ bool rseq_delay_resched(void) return false; =20 t->sched_time_delay =3D 1; + update_stat_preempt_delayed(t); =20 return true; } diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 6d50eff9be8c..fd572053a955 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -941,6 +941,13 @@ void hrtick_local_start(u64 delay) rq_unlock(rq, &rf); } =20 +#ifdef CONFIG_RSEQ +void update_stat_preempt_delayed(struct task_struct *t) +{ + schedstat_inc(t->stats.nr_preempt_delay_granted); +} +#endif + static void hrtick_rq_init(struct rq *rq) { #ifdef CONFIG_SMP diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c index 9135d5c2edea..3a2efd9505e1 100644 --- a/kernel/sched/debug.c +++ b/kernel/sched/debug.c @@ -1225,6 +1225,10 @@ void proc_sched_show_task(struct task_struct *p, str= uct pid_namespace *ns, P_SCHEDSTAT(nr_wakeups_passive); P_SCHEDSTAT(nr_wakeups_idle); =20 +#ifdef CONFIG_RSEQ + P_SCHEDSTAT(nr_preempt_delay_granted); +#endif + avg_atom =3D p->se.sum_exec_runtime; if (nr_switches) avg_atom =3D div64_ul(avg_atom, nr_switches); --=20 2.43.5