diff options
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/sched/core.c | 1 | ||||
| -rw-r--r-- | kernel/sched/fair.c | 31 | ||||
| -rw-r--r-- | kernel/sched/sched.h | 1 | ||||
| -rw-r--r-- | kernel/time/tick-sched.c | 9 |
4 files changed, 42 insertions, 0 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 7f1da77b83f3..699ff1499a8a 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -6024,6 +6024,7 @@ static void init_sched_groups_power(int cpu, struct sched_domain *sd) return; update_group_power(sd, cpu); + atomic_set(&sg->sgp->nr_busy_cpus, sg->group_weight); } int __weak arch_sd_sibling_asym_packing(void) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 50c06b0e9fab..e050563e97a4 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -4901,6 +4901,36 @@ static void nohz_balancer_kick(int cpu) return; } +static inline void set_cpu_sd_state_busy(void) +{ + struct sched_domain *sd; + int cpu = smp_processor_id(); + + if (!test_bit(NOHZ_IDLE, nohz_flags(cpu))) + return; + clear_bit(NOHZ_IDLE, nohz_flags(cpu)); + + rcu_read_lock(); + for_each_domain(cpu, sd) + atomic_inc(&sd->groups->sgp->nr_busy_cpus); + rcu_read_unlock(); +} + +void set_cpu_sd_state_idle(void) +{ + struct sched_domain *sd; + int cpu = smp_processor_id(); + + if (test_bit(NOHZ_IDLE, nohz_flags(cpu))) + return; + set_bit(NOHZ_IDLE, nohz_flags(cpu)); + + rcu_read_lock(); + for_each_domain(cpu, sd) + atomic_dec(&sd->groups->sgp->nr_busy_cpus); + rcu_read_unlock(); +} + /* * This routine will try to nominate the ilb (idle load balancing) * owner among the cpus whose ticks are stopped. ilb owner will do the idle @@ -5135,6 +5165,7 @@ static inline int nohz_kick_needed(struct rq *rq, int cpu) * We may be recently in ticked or tickless idle mode. At the first * busy tick after returning from idle, we will update the busy stats. */ + set_cpu_sd_state_busy(); if (unlikely(test_bit(NOHZ_TICK_STOPPED, nohz_flags(cpu)))) clear_bit(NOHZ_TICK_STOPPED, nohz_flags(cpu)); diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index cf7d02662bc2..91810f0ee3af 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -1069,6 +1069,7 @@ extern void account_cfs_bandwidth_used(int enabled, int was_enabled); enum rq_nohz_flag_bits { NOHZ_TICK_STOPPED, NOHZ_BALANCE_KICK, + NOHZ_IDLE, }; #define nohz_flags(cpu) (&cpu_rq(cpu)->nohz_flags) diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c index 40420644d0ba..31cc06163ed5 100644 --- a/kernel/time/tick-sched.c +++ b/kernel/time/tick-sched.c @@ -297,6 +297,15 @@ void tick_nohz_stop_sched_tick(int inidle) ts = &per_cpu(tick_cpu_sched, cpu); /* + * Update the idle state in the scheduler domain hierarchy + * when tick_nohz_stop_sched_tick() is called from the idle loop. + * State will be updated to busy during the first busy tick after + * exiting idle. + */ + if (inidle) + set_cpu_sd_state_idle(); + + /* * Call to tick_nohz_start_idle stops the last_update_time from being * updated. Thus, it must not be called in the event we are called from * irq_exit() with the prior state different than idle. |