diff options
| author | Paul Turner <pjt@google.com> | 2012-09-21 13:27:50 -0700 |
|---|---|---|
| committer | Viresh Kumar <viresh.kumar@linaro.org> | 2012-10-08 08:52:42 +0530 |
| commit | 6107935bcd9d27b1f7da0097d73f41919be5c45b (patch) | |
| tree | c8cf6fa5a45afe10c190151bca8e93bc1b02b2a1 | |
| parent | f8f05b85537a6b598f2ce7f5a9a346d6a0f1cc7f (diff) | |
sched: update_cfs_shares at period edge
Now that our measurement intervals are small (~1ms) we can amortize the posting
of update_shares() to be about each period overflow. This is a large cost
saving for frequently switching tasks.
Signed-off-by: Paul Turner <pjt@google.com>
Reviewed-by: Ben Segall <bsegall@google.com>
| -rw-r--r-- | kernel/sched/fair.c | 18 |
1 files changed, 10 insertions, 8 deletions
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index fb3f3fd58b8..4ce1e145267 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -1187,6 +1187,7 @@ static void update_cfs_rq_blocked_load(struct cfs_rq *cfs_rq, int force_update) } __update_cfs_rq_tg_load_contrib(cfs_rq, force_update); + update_cfs_shares(cfs_rq); } static inline void update_rq_runnable_avg(struct rq *rq, int runnable) @@ -1396,9 +1397,8 @@ enqueue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags) * Update run-time statistics of the 'current'. */ update_curr(cfs_rq); - enqueue_entity_load_avg(cfs_rq, se, flags & ENQUEUE_WAKEUP); account_entity_enqueue(cfs_rq, se); - update_cfs_shares(cfs_rq); + enqueue_entity_load_avg(cfs_rq, se, flags & ENQUEUE_WAKEUP); if (flags & ENQUEUE_WAKEUP) { place_entity(cfs_rq, se, 0); @@ -1471,7 +1471,6 @@ dequeue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags) * Update run-time statistics of the 'current'. */ update_curr(cfs_rq); - dequeue_entity_load_avg(cfs_rq, se, flags & DEQUEUE_SLEEP); update_stats_dequeue(cfs_rq, se); if (flags & DEQUEUE_SLEEP) { @@ -1491,8 +1490,8 @@ dequeue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags) if (se != cfs_rq->curr) __dequeue_entity(cfs_rq, se); - se->on_rq = 0; account_entity_dequeue(cfs_rq, se); + dequeue_entity_load_avg(cfs_rq, se, flags & DEQUEUE_SLEEP); /* * Normalize the entity after updating the min_vruntime because the @@ -1506,7 +1505,7 @@ dequeue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags) return_cfs_rq_runtime(cfs_rq); update_min_vruntime(cfs_rq); - update_cfs_shares(cfs_rq); + se->on_rq = 0; } /* @@ -2518,8 +2517,8 @@ enqueue_task_fair(struct rq *rq, struct task_struct *p, int flags) if (cfs_rq_throttled(cfs_rq)) break; - update_cfs_shares(cfs_rq); update_entity_load_avg(se, 1); + update_cfs_rq_blocked_load(cfs_rq, 0); } if (!se) { @@ -2579,8 +2578,8 @@ static void dequeue_task_fair(struct rq *rq, struct task_struct *p, int flags) if (cfs_rq_throttled(cfs_rq)) break; - update_cfs_shares(cfs_rq); update_entity_load_avg(se, 1); + update_cfs_rq_blocked_load(cfs_rq, 0); } if (!se) { @@ -5672,8 +5671,11 @@ int sched_group_set_shares(struct task_group *tg, unsigned long shares) se = tg->se[i]; /* Propagate contribution to hierarchy */ raw_spin_lock_irqsave(&rq->lock, flags); - for_each_sched_entity(se) + for_each_sched_entity(se) { update_cfs_shares(group_cfs_rq(se)); + /* update contribution to parent */ + update_entity_load_avg(se, 1); + } raw_spin_unlock_irqrestore(&rq->lock, flags); } |