diff options
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/sched.c | 19 |
1 files changed, 15 insertions, 4 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index 6da13bba3e23..c61ee3451a04 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -2650,6 +2650,16 @@ static inline void wake_sleeping_dependent(int this_cpu, runqueue_t *this_rq) */ } +/* + * number of 'lost' timeslices this task wont be able to fully + * utilize, if another task runs on a sibling. This models the + * slowdown effect of other tasks running on siblings: + */ +static inline unsigned long smt_slice(task_t *p, struct sched_domain *sd) +{ + return p->time_slice * (100 - sd->per_cpu_gain) / 100; +} + static inline int dependent_sleeper(int this_cpu, runqueue_t *this_rq) { struct sched_domain *tmp, *sd = NULL; @@ -2714,8 +2724,9 @@ static inline int dependent_sleeper(int this_cpu, runqueue_t *this_rq) (sd->per_cpu_gain * DEF_TIMESLICE / 100)) ret = 1; } else - if (((smt_curr->time_slice * (100 - sd->per_cpu_gain) / - 100) > task_timeslice(p))) + if (smt_curr->static_prio < p->static_prio && + !TASK_PREEMPTS_CURR(p, smt_rq) && + smt_slice(smt_curr, sd) > task_timeslice(p)) ret = 1; check_smt_task: @@ -2737,8 +2748,8 @@ check_smt_task: (sd->per_cpu_gain * DEF_TIMESLICE / 100)) resched_task(smt_curr); } else { - if ((p->time_slice * (100 - sd->per_cpu_gain) / 100) > - task_timeslice(smt_curr)) + if (TASK_PREEMPTS_CURR(p, smt_rq) && + smt_slice(p, sd) > task_timeslice(smt_curr)) resched_task(smt_curr); else wakeup_busy_runqueue(smt_rq); |