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| author | Daniel Lezcano <daniel.lezcano@linaro.org> | 2018-12-27 14:32:16 +0100 |
|---|---|---|
| committer | Daniel Lezcano <daniel.lezcano@linaro.org> | 2018-12-27 15:51:37 +0100 |
| commit | f225f5170898f202c6d538431417d835d00c2a60 (patch) | |
| tree | ffc2f982e17e2c1327fa1b0ec302b8e117fa56a0 | |
| parent | eca8b839d92c150a57963547867251b4a8614d9b (diff) | |
sched: Return next idle task scheduling out deadline
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
| -rw-r--r-- | include/linux/sched.h | 1 | ||||
| -rw-r--r-- | kernel/sched/core.c | 15 |
2 files changed, 16 insertions, 0 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h index 291a9bd5b97f..fbdf4d65d703 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -1540,6 +1540,7 @@ static inline int task_nice(const struct task_struct *p) extern int can_nice(const struct task_struct *p, const int nice); extern int task_curr(const struct task_struct *p); extern int idle_cpu(int cpu); +extern u64 idle_next_wakeup(void); extern int available_idle_cpu(int cpu); extern int sched_setscheduler(struct task_struct *, int, const struct sched_param *); extern int sched_setscheduler_nocheck(struct task_struct *, int, const struct sched_param *); diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 6fedf3a98581..87fde6568be4 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -2135,6 +2135,21 @@ int wake_up_state(struct task_struct *p, unsigned int state) return try_to_wake_up(p, state, 0); } +u64 idle_next_wakeup(void) +{ + struct rq *rq = this_rq(); + + /* + * We can only call this function from the idle task context + * because it relies on the idle_stamp field which is set to + * zero otherwise. + */ + if (WARN_ON_ONCE(!(current->flags & PF_IDLE))) + return U64_MAX; + + return rq->idle_stamp + rq->avg_idle; +} + /* * Perform scheduler related setup for a newly forked process p. * p is forked by current. |