diff options
| -rw-r--r-- | kernel/sched/core.c | 19 | ||||
| -rw-r--r-- | kernel/sched/cpudeadline.c | 2 | ||||
| -rw-r--r-- | kernel/sched/cputime.c | 10 | ||||
| -rw-r--r-- | kernel/sched/deadline.c | 5 | ||||
| -rw-r--r-- | kernel/sched/fair.c | 2 |
5 files changed, 34 insertions, 4 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 5c883fe8e440..2a906f20fba7 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -74,6 +74,7 @@ #include <linux/context_tracking.h> #include <linux/compiler.h> #include <linux/frame.h> +#include <linux/prefetch.h> #include <asm/switch_to.h> #include <asm/tlb.h> @@ -2972,6 +2973,23 @@ EXPORT_PER_CPU_SYMBOL(kstat); EXPORT_PER_CPU_SYMBOL(kernel_cpustat); /* + * The function fair_sched_class.update_curr accesses the struct curr + * and its field curr->exec_start; when called from task_sched_runtime(), + * we observe a high rate of cache misses in practice. + * Prefetching this data results in improved performance. + */ +static inline void prefetch_curr_exec_start(struct task_struct *p) +{ +#ifdef CONFIG_FAIR_GROUP_SCHED + struct sched_entity *curr = (&p->se)->cfs_rq->curr; +#else + struct sched_entity *curr = (&task_rq(p)->cfs)->curr; +#endif + prefetch(curr); + prefetch(&curr->exec_start); +} + +/* * Return accounted runtime for the task. * In case the task is currently running, return the runtime plus current's * pending runtime that have not been accounted yet. @@ -3005,6 +3023,7 @@ unsigned long long task_sched_runtime(struct task_struct *p) * thread, breaking clock_gettime(). */ if (task_current(rq, p) && task_on_rq_queued(p)) { + prefetch_curr_exec_start(p); update_rq_clock(rq); p->sched_class->update_curr(rq); } diff --git a/kernel/sched/cpudeadline.c b/kernel/sched/cpudeadline.c index 5be58820465c..d4184498c9f5 100644 --- a/kernel/sched/cpudeadline.c +++ b/kernel/sched/cpudeadline.c @@ -168,7 +168,7 @@ void cpudl_set(struct cpudl *cp, int cpu, u64 dl, int is_valid) if (old_idx == IDX_INVALID) { cp->size++; - cp->elements[cp->size - 1].dl = 0; + cp->elements[cp->size - 1].dl = dl; cp->elements[cp->size - 1].cpu = cpu; cp->elements[cpu].idx = cp->size - 1; cpudl_change_key(cp, cp->size - 1, dl); diff --git a/kernel/sched/cputime.c b/kernel/sched/cputime.c index 1934f658c036..9858266fb0b3 100644 --- a/kernel/sched/cputime.c +++ b/kernel/sched/cputime.c @@ -508,13 +508,21 @@ void account_process_tick(struct task_struct *p, int user_tick) */ void account_idle_ticks(unsigned long ticks) { + cputime_t cputime, steal; if (sched_clock_irqtime) { irqtime_account_idle_ticks(ticks); return; } - account_idle_time(jiffies_to_cputime(ticks)); + cputime = jiffies_to_cputime(ticks); + steal = steal_account_process_time(cputime); + + if (steal >= cputime) + return; + + cputime -= steal; + account_idle_time(cputime); } /* diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c index fcb7f0217ff4..1ce8867283dc 100644 --- a/kernel/sched/deadline.c +++ b/kernel/sched/deadline.c @@ -658,8 +658,11 @@ static enum hrtimer_restart dl_task_timer(struct hrtimer *timer) * * XXX figure out if select_task_rq_dl() deals with offline cpus. */ - if (unlikely(!rq->online)) + if (unlikely(!rq->online)) { + lockdep_unpin_lock(&rq->lock, rf.cookie); rq = dl_task_offline_migration(rq, p); + rf.cookie = lockdep_pin_lock(&rq->lock); + } /* * Queueing this task back might have overloaded rq, check if we need diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 4088eedea763..039de34f1521 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -4269,7 +4269,7 @@ static void sync_throttle(struct task_group *tg, int cpu) pcfs_rq = tg->parent->cfs_rq[cpu]; cfs_rq->throttle_count = pcfs_rq->throttle_count; - pcfs_rq->throttled_clock_task = rq_clock_task(cpu_rq(cpu)); + cfs_rq->throttled_clock_task = rq_clock_task(cpu_rq(cpu)); } /* conditionally throttle active cfs_rq's from put_prev_entity() */ |