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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 | 2 ++ kernel/rseq.c | 1 + kernel/sched/core.c | 5 +++++ kernel/sched/debug.c | 1 + 4 files changed, 9 insertions(+) diff --git a/include/linux/sched.h b/include/linux/sched.h index cce3a0496703..1367171b4a9e 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -340,6 +340,7 @@ 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); +extern void update_stat_preempt_delayed(struct task_struct *t); =20 /* wrapper function to trace from this header file */ DECLARE_TRACEPOINT(sched_set_state_tp); @@ -563,6 +564,7 @@ struct sched_statistics { u64 nr_wakeups_affine_attempts; u64 nr_wakeups_passive; u64 nr_wakeups_idle; + u64 nr_preempt_delay_granted; =20 #ifdef CONFIG_SCHED_CORE u64 core_forceidle_sum; diff --git a/kernel/rseq.c b/kernel/rseq.c index 0cfdaf5b6c8e..4c1586977f1b 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 05a952ec15ae..cb5bc0d41b01 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -936,6 +936,11 @@ void hrtick_local_start(u64 delay) rq_unlock(rq, &rf); } =20 +void update_stat_preempt_delayed(struct task_struct *t) +{ + schedstat_inc(t->stats.nr_preempt_delay_granted); +} + static void hrtick_rq_init(struct rq *rq) { #ifdef CONFIG_SMP diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c index 4cba21f5d24d..6b753f56c312 100644 --- a/kernel/sched/debug.c +++ b/kernel/sched/debug.c @@ -1216,6 +1216,7 @@ void proc_sched_show_task(struct task_struct *p, stru= ct pid_namespace *ns, P_SCHEDSTAT(nr_wakeups_affine_attempts); P_SCHEDSTAT(nr_wakeups_passive); P_SCHEDSTAT(nr_wakeups_idle); + P_SCHEDSTAT(nr_preempt_delay_granted); =20 avg_atom =3D p->se.sum_exec_runtime; if (nr_switches) --=20 2.43.5