sched: rt-group: synchonised bandwidth period
Various SMP balancing algorithms require that the bandwidth period run in sync. Possible improvements are moving the rt_bandwidth thing into root_domain and keeping a span per rt_bandwidth which marks throttled cpus. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra
Ingo Molnar
Родитель
57d3da2911
Коммит
d0b27fa778
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@ -1563,6 +1563,10 @@ int sched_nr_latency_handler(struct ctl_table *table, int write,
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extern unsigned int sysctl_sched_rt_period;
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extern int sysctl_sched_rt_runtime;
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int sched_rt_handler(struct ctl_table *table, int write,
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struct file *filp, void __user *buffer, size_t *lenp,
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loff_t *ppos);
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extern unsigned int sysctl_sched_compat_yield;
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#ifdef CONFIG_RT_MUTEXES
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@ -2052,6 +2056,9 @@ extern unsigned long sched_group_shares(struct task_group *tg);
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extern int sched_group_set_rt_runtime(struct task_group *tg,
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long rt_runtime_us);
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extern long sched_group_rt_runtime(struct task_group *tg);
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extern int sched_group_set_rt_period(struct task_group *tg,
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long rt_period_us);
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extern long sched_group_rt_period(struct task_group *tg);
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#endif
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#endif
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260
kernel/sched.c
260
kernel/sched.c
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@ -115,6 +115,11 @@ unsigned long long __attribute__((weak)) sched_clock(void)
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*/
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#define DEF_TIMESLICE (100 * HZ / 1000)
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/*
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* single value that denotes runtime == period, ie unlimited time.
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*/
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#define RUNTIME_INF ((u64)~0ULL)
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#ifdef CONFIG_SMP
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/*
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* Divide a load by a sched group cpu_power : (load / sg->__cpu_power)
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@ -156,6 +161,80 @@ struct rt_prio_array {
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struct list_head queue[MAX_RT_PRIO];
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};
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struct rt_bandwidth {
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ktime_t rt_period;
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u64 rt_runtime;
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struct hrtimer rt_period_timer;
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};
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static struct rt_bandwidth def_rt_bandwidth;
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static int do_sched_rt_period_timer(struct rt_bandwidth *rt_b, int overrun);
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static enum hrtimer_restart sched_rt_period_timer(struct hrtimer *timer)
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{
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struct rt_bandwidth *rt_b =
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container_of(timer, struct rt_bandwidth, rt_period_timer);
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ktime_t now;
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int overrun;
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int idle = 0;
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for (;;) {
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now = hrtimer_cb_get_time(timer);
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overrun = hrtimer_forward(timer, now, rt_b->rt_period);
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if (!overrun)
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break;
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idle = do_sched_rt_period_timer(rt_b, overrun);
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}
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return idle ? HRTIMER_NORESTART : HRTIMER_RESTART;
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}
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static
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void init_rt_bandwidth(struct rt_bandwidth *rt_b, u64 period, u64 runtime)
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{
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rt_b->rt_period = ns_to_ktime(period);
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rt_b->rt_runtime = runtime;
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hrtimer_init(&rt_b->rt_period_timer,
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CLOCK_MONOTONIC, HRTIMER_MODE_REL);
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rt_b->rt_period_timer.function = sched_rt_period_timer;
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rt_b->rt_period_timer.cb_mode = HRTIMER_CB_IRQSAFE_NO_SOFTIRQ;
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}
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static void start_rt_bandwidth(struct rt_bandwidth *rt_b)
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{
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ktime_t now;
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if (rt_b->rt_runtime == RUNTIME_INF)
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return;
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if (hrtimer_active(&rt_b->rt_period_timer))
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return;
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spin_lock(&rt_b->rt_runtime_lock);
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for (;;) {
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if (hrtimer_active(&rt_b->rt_period_timer))
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break;
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now = hrtimer_cb_get_time(&rt_b->rt_period_timer);
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hrtimer_forward(&rt_b->rt_period_timer, now, rt_b->rt_period);
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hrtimer_start(&rt_b->rt_period_timer,
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rt_b->rt_period_timer.expires,
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HRTIMER_MODE_ABS);
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}
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spin_unlock(&rt_b->rt_runtime_lock);
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}
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#ifdef CONFIG_RT_GROUP_SCHED
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static void destroy_rt_bandwidth(struct rt_bandwidth *rt_b)
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{
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hrtimer_cancel(&rt_b->rt_period_timer);
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}
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#endif
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#ifdef CONFIG_GROUP_SCHED
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#include <linux/cgroup.h>
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@ -182,7 +261,7 @@ struct task_group {
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struct sched_rt_entity **rt_se;
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struct rt_rq **rt_rq;
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u64 rt_runtime;
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struct rt_bandwidth rt_bandwidth;
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#endif
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struct rcu_head rcu;
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@ -407,8 +486,6 @@ struct rq {
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struct cfs_rq cfs;
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struct rt_rq rt;
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u64 rt_period_expire;
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int rt_throttled;
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#ifdef CONFIG_FAIR_GROUP_SCHED
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/* list of leaf cfs_rq on this cpu: */
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@ -592,23 +669,6 @@ static void update_rq_clock(struct rq *rq)
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#define task_rq(p) cpu_rq(task_cpu(p))
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#define cpu_curr(cpu) (cpu_rq(cpu)->curr)
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unsigned long rt_needs_cpu(int cpu)
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{
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struct rq *rq = cpu_rq(cpu);
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u64 delta;
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if (!rq->rt_throttled)
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return 0;
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if (rq->clock > rq->rt_period_expire)
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return 1;
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delta = rq->rt_period_expire - rq->clock;
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do_div(delta, NSEC_PER_SEC / HZ);
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return (unsigned long)delta;
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}
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/*
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* Tunables that become constants when CONFIG_SCHED_DEBUG is off:
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*/
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@ -664,10 +724,18 @@ static __read_mostly int scheduler_running;
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*/
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int sysctl_sched_rt_runtime = 950000;
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/*
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* single value that denotes runtime == period, ie unlimited time.
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*/
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#define RUNTIME_INF ((u64)~0ULL)
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static inline u64 global_rt_period(void)
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{
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return (u64)sysctl_sched_rt_period * NSEC_PER_USEC;
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}
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static inline u64 global_rt_runtime(void)
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{
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if (sysctl_sched_rt_period < 0)
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return RUNTIME_INF;
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return (u64)sysctl_sched_rt_runtime * NSEC_PER_USEC;
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}
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static const unsigned long long time_sync_thresh = 100000;
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@ -3854,7 +3922,6 @@ void scheduler_tick(void)
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update_last_tick_seen(rq);
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update_cpu_load(rq);
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curr->sched_class->task_tick(rq, curr, 0);
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update_sched_rt_period(rq);
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spin_unlock(&rq->lock);
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#ifdef CONFIG_SMP
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@ -4689,7 +4756,7 @@ recheck:
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* Do not allow realtime tasks into groups that have no runtime
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* assigned.
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*/
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if (rt_policy(policy) && task_group(p)->rt_runtime == 0)
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if (rt_policy(policy) && task_group(p)->rt_bandwidth.rt_runtime == 0)
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return -EPERM;
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#endif
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@ -7288,6 +7355,14 @@ void __init sched_init(void)
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init_defrootdomain();
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#endif
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init_rt_bandwidth(&def_rt_bandwidth,
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global_rt_period(), global_rt_runtime());
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#ifdef CONFIG_RT_GROUP_SCHED
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init_rt_bandwidth(&init_task_group.rt_bandwidth,
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global_rt_period(), global_rt_runtime());
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#endif
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#ifdef CONFIG_GROUP_SCHED
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list_add(&init_task_group.list, &task_groups);
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#endif
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@ -7312,15 +7387,11 @@ void __init sched_init(void)
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#endif
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#ifdef CONFIG_RT_GROUP_SCHED
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init_task_group.rt_runtime =
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sysctl_sched_rt_runtime * NSEC_PER_USEC;
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INIT_LIST_HEAD(&rq->leaf_rt_rq_list);
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init_tg_rt_entry(rq, &init_task_group,
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&per_cpu(init_rt_rq, i),
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&per_cpu(init_sched_rt_entity, i), i, 1);
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#endif
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rq->rt_period_expire = 0;
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rq->rt_throttled = 0;
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for (j = 0; j < CPU_LOAD_IDX_MAX; j++)
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rq->cpu_load[j] = 0;
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@ -7506,8 +7577,6 @@ void set_curr_task(int cpu, struct task_struct *p)
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#endif
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#ifdef CONFIG_GROUP_SCHED
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#ifdef CONFIG_FAIR_GROUP_SCHED
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static void free_fair_sched_group(struct task_group *tg)
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{
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@ -7596,6 +7665,8 @@ static void free_rt_sched_group(struct task_group *tg)
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{
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int i;
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destroy_rt_bandwidth(&tg->rt_bandwidth);
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for_each_possible_cpu(i) {
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if (tg->rt_rq)
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kfree(tg->rt_rq[i]);
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@ -7621,7 +7692,8 @@ static int alloc_rt_sched_group(struct task_group *tg)
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if (!tg->rt_se)
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goto err;
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tg->rt_runtime = 0;
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init_rt_bandwidth(&tg->rt_bandwidth,
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ktime_to_ns(def_rt_bandwidth.rt_period), 0);
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for_each_possible_cpu(i) {
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rq = cpu_rq(i);
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@ -7674,6 +7746,7 @@ static inline void unregister_rt_sched_group(struct task_group *tg, int cpu)
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}
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#endif
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#ifdef CONFIG_GROUP_SCHED
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static void free_sched_group(struct task_group *tg)
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{
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free_fair_sched_group(tg);
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@ -7775,6 +7848,7 @@ void sched_move_task(struct task_struct *tsk)
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task_rq_unlock(rq, &flags);
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}
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#endif
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#ifdef CONFIG_FAIR_GROUP_SCHED
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static void set_se_shares(struct sched_entity *se, unsigned long shares)
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@ -7871,16 +7945,15 @@ static int __rt_schedulable(struct task_group *tg, u64 period, u64 runtime)
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struct task_group *tgi;
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unsigned long total = 0;
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unsigned long global_ratio =
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to_ratio(sysctl_sched_rt_period,
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sysctl_sched_rt_runtime < 0 ?
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RUNTIME_INF : sysctl_sched_rt_runtime);
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to_ratio(global_rt_period(), global_rt_runtime());
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rcu_read_lock();
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list_for_each_entry_rcu(tgi, &task_groups, list) {
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if (tgi == tg)
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continue;
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total += to_ratio(period, tgi->rt_runtime);
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total += to_ratio(ktime_to_ns(tgi->rt_bandwidth.rt_period),
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tgi->rt_bandwidth.rt_runtime);
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}
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rcu_read_unlock();
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@ -7898,16 +7971,11 @@ static inline int tg_has_rt_tasks(struct task_group *tg)
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return 0;
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}
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int sched_group_set_rt_runtime(struct task_group *tg, long rt_runtime_us)
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static int tg_set_bandwidth(struct task_group *tg,
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u64 rt_period, u64 rt_runtime)
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{
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u64 rt_runtime, rt_period;
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int err = 0;
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rt_period = (u64)sysctl_sched_rt_period * NSEC_PER_USEC;
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rt_runtime = (u64)rt_runtime_us * NSEC_PER_USEC;
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if (rt_runtime_us == -1)
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rt_runtime = RUNTIME_INF;
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mutex_lock(&rt_constraints_mutex);
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read_lock(&tasklist_lock);
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if (rt_runtime_us == 0 && tg_has_rt_tasks(tg)) {
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@ -7918,7 +7986,8 @@ int sched_group_set_rt_runtime(struct task_group *tg, long rt_runtime_us)
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err = -EINVAL;
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goto unlock;
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}
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tg->rt_runtime = rt_runtime;
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tg->rt_bandwidth.rt_period = ns_to_ktime(rt_period);
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tg->rt_bandwidth.rt_runtime = rt_runtime;
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unlock:
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read_unlock(&tasklist_lock);
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mutex_unlock(&rt_constraints_mutex);
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@ -7926,19 +7995,96 @@ int sched_group_set_rt_runtime(struct task_group *tg, long rt_runtime_us)
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return err;
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}
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int sched_group_set_rt_runtime(struct task_group *tg, long rt_runtime_us)
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{
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u64 rt_runtime, rt_period;
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rt_period = ktime_to_ns(tg->rt_bandwidth.rt_period);
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rt_runtime = (u64)rt_runtime_us * NSEC_PER_USEC;
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if (rt_runtime_us < 0)
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rt_runtime = RUNTIME_INF;
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return tg_set_bandwidth(tg, rt_period, rt_runtime);
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}
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long sched_group_rt_runtime(struct task_group *tg)
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{
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u64 rt_runtime_us;
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if (tg->rt_runtime == RUNTIME_INF)
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if (tg->rt_bandwidth.rt_runtime == RUNTIME_INF)
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return -1;
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rt_runtime_us = tg->rt_runtime;
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rt_runtime_us = tg->rt_bandwidth.rt_runtime;
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do_div(rt_runtime_us, NSEC_PER_USEC);
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return rt_runtime_us;
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}
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int sched_group_set_rt_period(struct task_group *tg, long rt_period_us)
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{
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u64 rt_runtime, rt_period;
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rt_period = (u64)rt_period_us * NSEC_PER_USEC;
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rt_runtime = tg->rt_bandwidth.rt_runtime;
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return tg_set_bandwidth(tg, rt_period, rt_runtime);
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}
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long sched_group_rt_period(struct task_group *tg)
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{
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u64 rt_period_us;
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rt_period_us = ktime_to_ns(tg->rt_bandwidth.rt_period);
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do_div(rt_period_us, NSEC_PER_USEC);
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return rt_period_us;
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}
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static int sched_rt_global_constraints(void)
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{
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int ret = 0;
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mutex_lock(&rt_constraints_mutex);
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if (!__rt_schedulable(NULL, 1, 0))
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ret = -EINVAL;
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mutex_unlock(&rt_constraints_mutex);
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return ret;
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}
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#else
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static int sched_rt_global_constraints(void)
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{
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return 0;
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}
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#endif
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#endif /* CONFIG_GROUP_SCHED */
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int sched_rt_handler(struct ctl_table *table, int write,
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struct file *filp, void __user *buffer, size_t *lenp,
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loff_t *ppos)
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{
|
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int ret;
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int old_period, old_runtime;
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static DEFINE_MUTEX(mutex);
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mutex_lock(&mutex);
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old_period = sysctl_sched_rt_period;
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old_runtime = sysctl_sched_rt_runtime;
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ret = proc_dointvec(table, write, filp, buffer, lenp, ppos);
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|
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if (!ret && write) {
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ret = sched_rt_global_constraints();
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if (ret) {
|
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sysctl_sched_rt_period = old_period;
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sysctl_sched_rt_runtime = old_runtime;
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} else {
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def_rt_bandwidth.rt_runtime = global_rt_runtime();
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def_rt_bandwidth.rt_period =
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ns_to_ktime(global_rt_period());
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}
|
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}
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mutex_unlock(&mutex);
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|
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return ret;
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}
|
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|
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#ifdef CONFIG_CGROUP_SCHED
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|
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|
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@ -7988,7 +8134,7 @@ cpu_cgroup_can_attach(struct cgroup_subsys *ss, struct cgroup *cgrp,
|
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{
|
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#ifdef CONFIG_RT_GROUP_SCHED
|
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/* Don't accept realtime tasks when there is no way for them to run */
|
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if (rt_task(tsk) && cgroup_tg(cgrp)->rt_runtime == 0)
|
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if (rt_task(tsk) && cgroup_tg(cgrp)->rt_bandwidth.rt_runtime == 0)
|
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return -EINVAL;
|
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#else
|
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/* We don't support RT-tasks being in separate groups */
|
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|
|
@ -8066,6 +8212,17 @@ static ssize_t cpu_rt_runtime_read(struct cgroup *cgrp, struct cftype *cft,
|
|||
|
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return simple_read_from_buffer(buf, nbytes, ppos, tmp, len);
|
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}
|
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|
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static int cpu_rt_period_write_uint(struct cgroup *cgrp, struct cftype *cftype,
|
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u64 rt_period_us)
|
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{
|
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return sched_group_set_rt_period(cgroup_tg(cgrp), rt_period_us);
|
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}
|
||||
|
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static u64 cpu_rt_period_read_uint(struct cgroup *cgrp, struct cftype *cft)
|
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{
|
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return sched_group_rt_period(cgroup_tg(cgrp));
|
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}
|
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#endif
|
||||
|
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static struct cftype cpu_files[] = {
|
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|
|
@ -8082,6 +8239,11 @@ static struct cftype cpu_files[] = {
|
|||
.read = cpu_rt_runtime_read,
|
||||
.write = cpu_rt_runtime_write,
|
||||
},
|
||||
{
|
||||
.name = "rt_period_us",
|
||||
.read_uint = cpu_rt_period_read_uint,
|
||||
.write_uint = cpu_rt_period_write_uint,
|
||||
},
|
||||
#endif
|
||||
};
|
||||
|
||||
|
|
|
|||
|
|
@ -62,7 +62,7 @@ static inline u64 sched_rt_runtime(struct rt_rq *rt_rq)
|
|||
if (!rt_rq->tg)
|
||||
return RUNTIME_INF;
|
||||
|
||||
return rt_rq->tg->rt_runtime;
|
||||
return rt_rq->tg->rt_bandwidth.rt_runtime;
|
||||
}
|
||||
|
||||
#define for_each_leaf_rt_rq(rt_rq, rq) \
|
||||
|
|
@ -127,14 +127,29 @@ static int rt_se_boosted(struct sched_rt_entity *rt_se)
|
|||
return p->prio != p->normal_prio;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_SMP
|
||||
static inline cpumask_t sched_rt_period_mask(void)
|
||||
{
|
||||
return cpu_rq(smp_processor_id())->rd->span;
|
||||
}
|
||||
#else
|
||||
static inline cpumask_t sched_rt_period_mask(void)
|
||||
{
|
||||
return cpu_online_map;
|
||||
}
|
||||
#endif
|
||||
|
||||
static inline
|
||||
struct rt_rq *sched_rt_period_rt_rq(struct rt_bandwidth *rt_b, int cpu)
|
||||
{
|
||||
return container_of(rt_b, struct task_group, rt_bandwidth)->rt_rq[cpu];
|
||||
}
|
||||
|
||||
#else
|
||||
|
||||
static inline u64 sched_rt_runtime(struct rt_rq *rt_rq)
|
||||
{
|
||||
if (sysctl_sched_rt_runtime == -1)
|
||||
return RUNTIME_INF;
|
||||
|
||||
return (u64)sysctl_sched_rt_runtime * NSEC_PER_USEC;
|
||||
return def_rt_bandwidth.rt_runtime;
|
||||
}
|
||||
|
||||
#define for_each_leaf_rt_rq(rt_rq, rq) \
|
||||
|
|
@ -173,8 +188,55 @@ static inline int rt_rq_throttled(struct rt_rq *rt_rq)
|
|||
{
|
||||
return rt_rq->rt_throttled;
|
||||
}
|
||||
|
||||
static inline cpumask_t sched_rt_period_mask(void)
|
||||
{
|
||||
return cpu_online_map;
|
||||
}
|
||||
|
||||
static inline
|
||||
struct rt_rq *sched_rt_period_rt_rq(struct rt_bandwidth *rt_b, int cpu)
|
||||
{
|
||||
return &cpu_rq(cpu)->rt;
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
static int do_sched_rt_period_timer(struct rt_bandwidth *rt_b, int overrun)
|
||||
{
|
||||
int i, idle = 1;
|
||||
cpumask_t span;
|
||||
|
||||
if (rt_b->rt_runtime == RUNTIME_INF)
|
||||
return 1;
|
||||
|
||||
span = sched_rt_period_mask();
|
||||
for_each_cpu_mask(i, span) {
|
||||
int enqueue = 0;
|
||||
struct rt_rq *rt_rq = sched_rt_period_rt_rq(rt_b, i);
|
||||
struct rq *rq = rq_of_rt_rq(rt_rq);
|
||||
|
||||
spin_lock(&rq->lock);
|
||||
if (rt_rq->rt_time) {
|
||||
u64 runtime = rt_b->rt_runtime;
|
||||
|
||||
rt_rq->rt_time -= min(rt_rq->rt_time, overrun*runtime);
|
||||
if (rt_rq->rt_throttled && rt_rq->rt_time < runtime) {
|
||||
rt_rq->rt_throttled = 0;
|
||||
enqueue = 1;
|
||||
}
|
||||
if (rt_rq->rt_time || rt_rq->rt_nr_running)
|
||||
idle = 0;
|
||||
}
|
||||
|
||||
if (enqueue)
|
||||
sched_rt_rq_enqueue(rt_rq);
|
||||
spin_unlock(&rq->lock);
|
||||
}
|
||||
|
||||
return idle;
|
||||
}
|
||||
|
||||
static inline int rt_se_prio(struct sched_rt_entity *rt_se)
|
||||
{
|
||||
#ifdef CONFIG_RT_GROUP_SCHED
|
||||
|
|
@ -198,11 +260,7 @@ static int sched_rt_runtime_exceeded(struct rt_rq *rt_rq)
|
|||
return rt_rq_throttled(rt_rq);
|
||||
|
||||
if (rt_rq->rt_time > runtime) {
|
||||
struct rq *rq = rq_of_rt_rq(rt_rq);
|
||||
|
||||
rq->rt_throttled = 1;
|
||||
rt_rq->rt_throttled = 1;
|
||||
|
||||
if (rt_rq_throttled(rt_rq)) {
|
||||
sched_rt_rq_dequeue(rt_rq);
|
||||
return 1;
|
||||
|
|
@ -212,29 +270,6 @@ static int sched_rt_runtime_exceeded(struct rt_rq *rt_rq)
|
|||
return 0;
|
||||
}
|
||||
|
||||
static void update_sched_rt_period(struct rq *rq)
|
||||
{
|
||||
struct rt_rq *rt_rq;
|
||||
u64 period;
|
||||
|
||||
while (rq->clock > rq->rt_period_expire) {
|
||||
period = (u64)sysctl_sched_rt_period * NSEC_PER_USEC;
|
||||
rq->rt_period_expire += period;
|
||||
|
||||
for_each_leaf_rt_rq(rt_rq, rq) {
|
||||
u64 runtime = sched_rt_runtime(rt_rq);
|
||||
|
||||
rt_rq->rt_time -= min(rt_rq->rt_time, runtime);
|
||||
if (rt_rq->rt_throttled && rt_rq->rt_time < runtime) {
|
||||
rt_rq->rt_throttled = 0;
|
||||
sched_rt_rq_enqueue(rt_rq);
|
||||
}
|
||||
}
|
||||
|
||||
rq->rt_throttled = 0;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Update the current task's runtime statistics. Skip current tasks that
|
||||
* are not in our scheduling class.
|
||||
|
|
@ -284,6 +319,11 @@ void inc_rt_tasks(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq)
|
|||
#ifdef CONFIG_RT_GROUP_SCHED
|
||||
if (rt_se_boosted(rt_se))
|
||||
rt_rq->rt_nr_boosted++;
|
||||
|
||||
if (rt_rq->tg)
|
||||
start_rt_bandwidth(&rt_rq->tg->rt_bandwidth);
|
||||
#else
|
||||
start_rt_bandwidth(&def_rt_bandwidth);
|
||||
#endif
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -307,7 +307,7 @@ static struct ctl_table kern_table[] = {
|
|||
.data = &sysctl_sched_rt_period,
|
||||
.maxlen = sizeof(unsigned int),
|
||||
.mode = 0644,
|
||||
.proc_handler = &proc_dointvec,
|
||||
.proc_handler = &sched_rt_handler,
|
||||
},
|
||||
{
|
||||
.ctl_name = CTL_UNNUMBERED,
|
||||
|
|
@ -315,7 +315,7 @@ static struct ctl_table kern_table[] = {
|
|||
.data = &sysctl_sched_rt_runtime,
|
||||
.maxlen = sizeof(int),
|
||||
.mode = 0644,
|
||||
.proc_handler = &proc_dointvec,
|
||||
.proc_handler = &sched_rt_handler,
|
||||
},
|
||||
{
|
||||
.ctl_name = CTL_UNNUMBERED,
|
||||
|
|
|
|||
|
|
@ -191,7 +191,6 @@ u64 get_cpu_idle_time_us(int cpu, u64 *last_update_time)
|
|||
void tick_nohz_stop_sched_tick(void)
|
||||
{
|
||||
unsigned long seq, last_jiffies, next_jiffies, delta_jiffies, flags;
|
||||
unsigned long rt_jiffies;
|
||||
struct tick_sched *ts;
|
||||
ktime_t last_update, expires, now;
|
||||
struct clock_event_device *dev = __get_cpu_var(tick_cpu_device).evtdev;
|
||||
|
|
@ -243,10 +242,6 @@ void tick_nohz_stop_sched_tick(void)
|
|||
next_jiffies = get_next_timer_interrupt(last_jiffies);
|
||||
delta_jiffies = next_jiffies - last_jiffies;
|
||||
|
||||
rt_jiffies = rt_needs_cpu(cpu);
|
||||
if (rt_jiffies && rt_jiffies < delta_jiffies)
|
||||
delta_jiffies = rt_jiffies;
|
||||
|
||||
if (rcu_needs_cpu(cpu))
|
||||
delta_jiffies = 1;
|
||||
/*
|
||||
|
|
|
|||
|
|
@ -193,6 +193,33 @@ static ssize_t cpu_rt_runtime_store(struct kobject *kobj,
|
|||
|
||||
static struct kobj_attribute cpu_rt_runtime_attr =
|
||||
__ATTR(cpu_rt_runtime, 0644, cpu_rt_runtime_show, cpu_rt_runtime_store);
|
||||
|
||||
static ssize_t cpu_rt_period_show(struct kobject *kobj,
|
||||
struct kobj_attribute *attr,
|
||||
char *buf)
|
||||
{
|
||||
struct user_struct *up = container_of(kobj, struct user_struct, kobj);
|
||||
|
||||
return sprintf(buf, "%lu\n", sched_group_rt_period(up->tg));
|
||||
}
|
||||
|
||||
static ssize_t cpu_rt_period_store(struct kobject *kobj,
|
||||
struct kobj_attribute *attr,
|
||||
const char *buf, size_t size)
|
||||
{
|
||||
struct user_struct *up = container_of(kobj, struct user_struct, kobj);
|
||||
unsigned long rt_period;
|
||||
int rc;
|
||||
|
||||
sscanf(buf, "%lu", &rt_period);
|
||||
|
||||
rc = sched_group_set_rt_period(up->tg, rt_period);
|
||||
|
||||
return (rc ? rc : size);
|
||||
}
|
||||
|
||||
static struct kobj_attribute cpu_rt_period_attr =
|
||||
__ATTR(cpu_rt_period, 0644, cpu_rt_period_show, cpu_rt_period_store);
|
||||
#endif
|
||||
|
||||
/* default attributes per uid directory */
|
||||
|
|
@ -202,6 +229,7 @@ static struct attribute *uids_attributes[] = {
|
|||
#endif
|
||||
#ifdef CONFIG_RT_GROUP_SCHED
|
||||
&cpu_rt_runtime_attr.attr,
|
||||
&cpu_rt_period_attr.attr,
|
||||
#endif
|
||||
NULL
|
||||
};
|
||||
|
|
|
|||
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