diff options
Diffstat (limited to 'kernel/sched/fair.c')
| -rw-r--r-- | kernel/sched/fair.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 07f555857698..53dea95ad8c9 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -4774,6 +4774,11 @@ static inline unsigned long task_util(struct task_struct *p) return READ_ONCE(p->se.avg.util_avg); } +static inline unsigned long task_runnable(struct task_struct *p) +{ + return READ_ONCE(p->se.avg.runnable_avg); +} + static inline unsigned long _task_util_est(struct task_struct *p) { struct util_est ue = READ_ONCE(p->se.avg.util_est); @@ -4893,6 +4898,14 @@ static inline void util_est_update(struct cfs_rq *cfs_rq, return; /* + * To avoid underestimate of task utilization, skip updates of EWMA if + * we cannot grant that thread got all CPU time it wanted. + */ + if ((ue.enqueued + UTIL_EST_MARGIN) < task_runnable(p)) + goto done; + + + /* * Update Task's estimated utilization * * When *p completes an activation we can consolidate another sample |