sched/fair: Rework throttle_count sync
Since we already take rq->lock when creating a cgroup, use it to also sync the throttle_count and avoid the extra state and enqueue path branch. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Konstantin Khlebnikov <khlebnikov@yandex-team.ru> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: bsegall@google.com Cc: linux-kernel@vger.kernel.org [ Fixed build warning. ] Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -4241,26 +4241,6 @@ static void check_enqueue_throttle(struct cfs_rq *cfs_rq)
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if (!cfs_bandwidth_used())
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return;
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/* Synchronize hierarchical throttle counter: */
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if (unlikely(!cfs_rq->throttle_uptodate)) {
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struct rq *rq = rq_of(cfs_rq);
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struct cfs_rq *pcfs_rq;
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struct task_group *tg;
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cfs_rq->throttle_uptodate = 1;
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/* Get closest up-to-date node, because leaves go first: */
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for (tg = cfs_rq->tg->parent; tg; tg = tg->parent) {
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pcfs_rq = tg->cfs_rq[cpu_of(rq)];
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if (pcfs_rq->throttle_uptodate)
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break;
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}
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if (tg) {
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cfs_rq->throttle_count = pcfs_rq->throttle_count;
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cfs_rq->throttled_clock_task = rq_clock_task(rq);
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}
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}
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/* an active group must be handled by the update_curr()->put() path */
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if (!cfs_rq->runtime_enabled || cfs_rq->curr)
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return;
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@ -4275,6 +4255,23 @@ static void check_enqueue_throttle(struct cfs_rq *cfs_rq)
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throttle_cfs_rq(cfs_rq);
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}
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static void sync_throttle(struct task_group *tg, int cpu)
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{
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struct cfs_rq *pcfs_rq, *cfs_rq;
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if (!cfs_bandwidth_used())
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return;
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if (!tg->parent)
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return;
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cfs_rq = tg->cfs_rq[cpu];
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pcfs_rq = tg->parent->cfs_rq[cpu];
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cfs_rq->throttle_count = pcfs_rq->throttle_count;
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pcfs_rq->throttled_clock_task = rq_clock_task(cpu_rq(cpu));
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}
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/* conditionally throttle active cfs_rq's from put_prev_entity() */
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static bool check_cfs_rq_runtime(struct cfs_rq *cfs_rq)
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{
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@ -4414,6 +4411,7 @@ static inline u64 cfs_rq_clock_task(struct cfs_rq *cfs_rq)
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static void account_cfs_rq_runtime(struct cfs_rq *cfs_rq, u64 delta_exec) {}
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static bool check_cfs_rq_runtime(struct cfs_rq *cfs_rq) { return false; }
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static void check_enqueue_throttle(struct cfs_rq *cfs_rq) {}
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static inline void sync_throttle(struct task_group *tg, int cpu) {}
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static __always_inline void return_cfs_rq_runtime(struct cfs_rq *cfs_rq) {}
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static inline int cfs_rq_throttled(struct cfs_rq *cfs_rq)
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@ -8646,6 +8644,7 @@ void online_fair_sched_group(struct task_group *tg)
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raw_spin_lock_irq(&rq->lock);
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post_init_entity_util_avg(se);
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sync_throttle(tg, i);
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raw_spin_unlock_irq(&rq->lock);
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}
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}
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@ -438,7 +438,7 @@ struct cfs_rq {
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u64 throttled_clock, throttled_clock_task;
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u64 throttled_clock_task_time;
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int throttled, throttle_count, throttle_uptodate;
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int throttled, throttle_count;
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struct list_head throttled_list;
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#endif /* CONFIG_CFS_BANDWIDTH */
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#endif /* CONFIG_FAIR_GROUP_SCHED */
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