Messages in this thread Patch in this message | | | Date | Mon, 9 Nov 2009 14:41:14 +0530 | From | Bharata B Rao <> | Subject | [RFC v3 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 | 45 ++++++++++++++++++++++++++++++++++++++++++++- 2 files changed, 47 insertions(+), 1 deletions(-)
diff --git a/kernel/sched.c b/kernel/sched.c index 5d2e5e5..8cccda2 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -1889,6 +1889,8 @@ 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); @@ -1908,6 +1910,7 @@ 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 b83ff7d..557d30d 100644 --- a/kernel/sched_fair.c +++ b/kernel/sched_fair.c @@ -221,6 +221,50 @@ static void sched_cfs_runtime_exceeded(struct sched_entity *se, } } +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) { + if (se->on_rq) + break; + if (cfs_rq_throttled(group_cfs_rq(se))) + 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(); + struct task_group *tg = container_of(cfs_b, struct task_group, + cfs_bandwidth); + unsigned long flags; + + for_each_cpu(i, span) { + struct rq *rq = cpu_rq(i); + struct cfs_rq *cfs_rq = tg->cfs_rq[i]; + struct sched_entity *se = 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 int cfs_rq_throttled(struct cfs_rq *cfs_rq) @@ -304,7 +348,6 @@ static void sched_cfs_runtime_exceeded(struct sched_entity *se, #endif /* CONFIG_FAIR_GROUP_SCHED */ - /************************************************************** * Scheduling class tree data structure manipulation methods: */
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