Messages in this thread Patch in this message | | | Date | Tue, 17 Nov 2009 20:05:57 +0530 | From | Bharata B Rao <> | Subject | [RFC v4 PATCH 4/7] sched: Unthrottle the throttled tasks |
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sched: Unthrottle the throttled tasks.
From: Bharata B Rao <bharata@linux.vnet.ibm.com>
Refresh runtimes when group's period expires. Unthrottle any throttled groups at that time. Refreshing runtimes is driven through a periodic timer.
Signed-off-by: Bharata B Rao <bharata@linux.vnet.ibm.com> --- kernel/sched.c | 3 +++ kernel/sched_fair.c | 51 ++++++++++++++++++++++++++++++++++++++++++++++++++- 2 files changed, 53 insertions(+), 1 deletions(-)
diff --git a/kernel/sched.c b/kernel/sched.c index 19069d3..dd56c72 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -1886,6 +1886,8 @@ static inline u64 global_cfs_runtime(void) return RUNTIME_INF; } +void do_sched_cfs_period_timer(struct cfs_bandwidth *cfs_b); + static inline void cfs_rq_runtime_lock(struct cfs_rq *cfs_rq) { spin_lock(&cfs_rq->cfs_runtime_lock); @@ -1905,6 +1907,7 @@ static enum hrtimer_restart sched_cfs_period_timer(struct hrtimer *timer) struct cfs_bandwidth *cfs_b = container_of(timer, struct cfs_bandwidth, cfs_period_timer); + do_sched_cfs_period_timer(cfs_b); hrtimer_add_expires_ns(timer, ktime_to_ns(cfs_b->cfs_period)); return HRTIMER_RESTART; } diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c index ea7468c..3d0f006 100644 --- a/kernel/sched_fair.c +++ b/kernel/sched_fair.c @@ -191,6 +191,13 @@ find_matching_se(struct sched_entity **se, struct sched_entity **pse) #ifdef CONFIG_CFS_HARD_LIMITS +static inline +struct cfs_rq *sched_cfs_period_cfs_rq(struct cfs_bandwidth *cfs_b, int cpu) +{ + return container_of(cfs_b, struct task_group, + cfs_bandwidth)->cfs_rq[cpu]; +} + static inline int cfs_rq_throttled(struct cfs_rq *cfs_rq) { return cfs_rq->cfs_throttled; @@ -227,6 +234,49 @@ static inline void update_curr_group(struct sched_entity *curr, sched_cfs_runtime_exceeded(curr, tsk_curr, delta_exec); } +static void enqueue_entity_locked(struct cfs_rq *cfs_rq, + struct sched_entity *se, int wakeup); + +static void enqueue_throttled_entity(struct rq *rq, struct sched_entity *se) +{ + for_each_sched_entity(se) { + struct cfs_rq *gcfs_rq = group_cfs_rq(se); + + if (se->on_rq || cfs_rq_throttled(gcfs_rq) || + !gcfs_rq->nr_running) + break; + enqueue_entity_locked(cfs_rq_of(se), se, 0); + } +} + +/* + * Refresh runtimes of all cfs_rqs in this group, i,e., + * refresh runtimes of the representative cfs_rq of this + * tg on all cpus. Enqueue any throttled entity back. + */ +void do_sched_cfs_period_timer(struct cfs_bandwidth *cfs_b) +{ + int i; + const struct cpumask *span = sched_bw_period_mask(); + unsigned long flags; + + for_each_cpu(i, span) { + struct rq *rq = cpu_rq(i); + struct cfs_rq *cfs_rq = sched_cfs_period_cfs_rq(cfs_b, i); + struct sched_entity *se = cfs_rq->tg->se[i]; + + spin_lock_irqsave(&rq->lock, flags); + cfs_rq_runtime_lock(cfs_rq); + cfs_rq->cfs_time = 0; + if (cfs_rq_throttled(cfs_rq)) { + cfs_rq->cfs_throttled = 0; + enqueue_throttled_entity(rq, se); + } + cfs_rq_runtime_unlock(cfs_rq); + spin_unlock_irqrestore(&rq->lock, flags); + } +} + #else static inline void update_curr_group(struct sched_entity *curr, @@ -310,7 +360,6 @@ find_matching_se(struct sched_entity **se, struct sched_entity **pse) #endif /* CONFIG_FAIR_GROUP_SCHED */ - /************************************************************** * Scheduling class tree data structure manipulation methods: */
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