sched: rt-group: interface
Change the rt_ratio interface to rt_runtime_us, to match rt_period_us. This avoids picking a granularity for the ratio. Extend the /sys/kernel/uids/<uid>/ interface to allow setting the group's rt_runtime. 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
parent
23b0fdfc92
commit
9f0c1e560c
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@ -0,0 +1,59 @@
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Real-Time group scheduling.
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The problem space:
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In order to schedule multiple groups of realtime tasks each group must
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be assigned a fixed portion of the CPU time available. Without a minimum
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guarantee a realtime group can obviously fall short. A fuzzy upper limit
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is of no use since it cannot be relied upon. Which leaves us with just
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the single fixed portion.
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CPU time is divided by means of specifying how much time can be spent
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running in a given period. Say a frame fixed realtime renderer must
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deliver 25 frames a second, which yields a period of 0.04s. Now say
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it will also have to play some music and respond to input, leaving it
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with around 80% for the graphics. We can then give this group a runtime
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of 0.8 * 0.04s = 0.032s.
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This way the graphics group will have a 0.04s period with a 0.032s runtime
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limit.
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Now if the audio thread needs to refill the DMA buffer every 0.005s, but
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needs only about 3% CPU time to do so, it can do with a 0.03 * 0.005s
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= 0.00015s.
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The Interface:
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system wide:
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/proc/sys/kernel/sched_rt_period_ms
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/proc/sys/kernel/sched_rt_runtime_us
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CONFIG_FAIR_USER_SCHED
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/sys/kernel/uids/<uid>/cpu_rt_runtime_us
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or
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CONFIG_FAIR_CGROUP_SCHED
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/cgroup/<cgroup>/cpu.rt_runtime_us
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[ time is specified in us because the interface is s32; this gives an
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operating range of ~35m to 1us ]
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The period takes values in [ 1, INT_MAX ], runtime in [ -1, INT_MAX - 1 ].
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A runtime of -1 specifies runtime == period, ie. no limit.
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New groups get the period from /proc/sys/kernel/sched_rt_period_us and
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a runtime of 0.
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Settings are constrained to:
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\Sum_{i} runtime_{i} / global_period <= global_runtime / global_period
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in order to keep the configuration schedulable.
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@ -1541,8 +1541,6 @@ extern unsigned int sysctl_sched_child_runs_first;
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extern unsigned int sysctl_sched_features;
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extern unsigned int sysctl_sched_migration_cost;
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extern unsigned int sysctl_sched_nr_migrate;
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extern unsigned int sysctl_sched_rt_period;
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extern unsigned int sysctl_sched_rt_ratio;
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#if defined(CONFIG_FAIR_GROUP_SCHED) && defined(CONFIG_SMP)
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extern unsigned int sysctl_sched_min_bal_int_shares;
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extern unsigned int sysctl_sched_max_bal_int_shares;
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@ -1552,6 +1550,8 @@ int sched_nr_latency_handler(struct ctl_table *table, int write,
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struct file *file, void __user *buffer, size_t *length,
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loff_t *ppos);
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#endif
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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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extern unsigned int sysctl_sched_compat_yield;
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@ -2036,6 +2036,9 @@ extern void sched_destroy_group(struct task_group *tg);
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extern void sched_move_task(struct task_struct *tsk);
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extern int sched_group_set_shares(struct task_group *tg, unsigned long shares);
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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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#endif
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143
kernel/sched.c
143
kernel/sched.c
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@ -176,7 +176,7 @@ 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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unsigned int rt_ratio;
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u64 rt_runtime;
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/*
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* shares assigned to a task group governs how much of cpu bandwidth
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@ -642,19 +642,21 @@ const_debug unsigned int sysctl_sched_features =
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const_debug unsigned int sysctl_sched_nr_migrate = 32;
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/*
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* period over which we measure -rt task cpu usage in ms.
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* period over which we measure -rt task cpu usage in us.
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* default: 1s
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*/
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const_debug unsigned int sysctl_sched_rt_period = 1000;
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#define SCHED_RT_FRAC_SHIFT 16
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#define SCHED_RT_FRAC (1UL << SCHED_RT_FRAC_SHIFT)
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unsigned int sysctl_sched_rt_period = 1000000;
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/*
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* ratio of time -rt tasks may consume.
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* default: 95%
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* part of the period that we allow rt tasks to run in us.
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* default: 0.95s
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*/
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const_debug unsigned int sysctl_sched_rt_ratio = 62259;
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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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/*
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* For kernel-internal use: high-speed (but slightly incorrect) per-cpu
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@ -7187,7 +7189,8 @@ void __init sched_init(void)
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&per_cpu(init_cfs_rq, i),
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&per_cpu(init_sched_entity, i), i, 1);
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init_task_group.rt_ratio = sysctl_sched_rt_ratio; /* XXX */
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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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@ -7583,7 +7586,7 @@ struct task_group *sched_create_group(void)
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goto err;
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tg->shares = NICE_0_LOAD;
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tg->rt_ratio = 0; /* XXX */
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tg->rt_runtime = 0;
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for_each_possible_cpu(i) {
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rq = cpu_rq(i);
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@ -7785,30 +7788,76 @@ unsigned long sched_group_shares(struct task_group *tg)
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}
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/*
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* Ensure the total rt_ratio <= sysctl_sched_rt_ratio
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* Ensure that the real time constraints are schedulable.
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*/
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int sched_group_set_rt_ratio(struct task_group *tg, unsigned long rt_ratio)
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static DEFINE_MUTEX(rt_constraints_mutex);
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static unsigned long to_ratio(u64 period, u64 runtime)
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{
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if (runtime == RUNTIME_INF)
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return 1ULL << 16;
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runtime *= (1ULL << 16);
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div64_64(runtime, period);
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return runtime;
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}
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static int __rt_schedulable(struct task_group *tg, u64 period, u64 runtime)
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{
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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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rcu_read_lock();
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list_for_each_entry_rcu(tgi, &task_groups, list)
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total += tgi->rt_ratio;
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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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}
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rcu_read_unlock();
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if (total + rt_ratio - tg->rt_ratio > sysctl_sched_rt_ratio)
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return -EINVAL;
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tg->rt_ratio = rt_ratio;
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return 0;
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return total + to_ratio(period, runtime) < global_ratio;
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}
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unsigned long sched_group_rt_ratio(struct task_group *tg)
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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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return tg->rt_ratio;
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u64 rt_runtime, rt_period;
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int err = 0;
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rt_period = 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 = rt_period;
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mutex_lock(&rt_constraints_mutex);
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if (!__rt_schedulable(tg, rt_period, rt_runtime)) {
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err = -EINVAL;
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goto unlock;
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}
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if (rt_runtime_us == -1)
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rt_runtime = RUNTIME_INF;
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tg->rt_runtime = rt_runtime;
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unlock:
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mutex_unlock(&rt_constraints_mutex);
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return err;
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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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return -1;
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rt_runtime_us = tg->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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#endif /* CONFIG_FAIR_GROUP_SCHED */
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#ifdef CONFIG_FAIR_CGROUP_SCHED
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@ -7884,17 +7933,49 @@ static u64 cpu_shares_read_uint(struct cgroup *cgrp, struct cftype *cft)
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return (u64) tg->shares;
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}
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static int cpu_rt_ratio_write_uint(struct cgroup *cgrp, struct cftype *cftype,
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u64 rt_ratio_val)
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static int cpu_rt_runtime_write(struct cgroup *cgrp, struct cftype *cft,
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struct file *file,
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const char __user *userbuf,
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size_t nbytes, loff_t *unused_ppos)
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{
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return sched_group_set_rt_ratio(cgroup_tg(cgrp), rt_ratio_val);
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char buffer[64];
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int retval = 0;
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s64 val;
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char *end;
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if (!nbytes)
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return -EINVAL;
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if (nbytes >= sizeof(buffer))
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return -E2BIG;
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if (copy_from_user(buffer, userbuf, nbytes))
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return -EFAULT;
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buffer[nbytes] = 0; /* nul-terminate */
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/* strip newline if necessary */
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if (nbytes && (buffer[nbytes-1] == '\n'))
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buffer[nbytes-1] = 0;
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val = simple_strtoll(buffer, &end, 0);
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if (*end)
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return -EINVAL;
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/* Pass to subsystem */
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retval = sched_group_set_rt_runtime(cgroup_tg(cgrp), val);
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if (!retval)
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retval = nbytes;
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return retval;
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}
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static u64 cpu_rt_ratio_read_uint(struct cgroup *cgrp, struct cftype *cft)
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static ssize_t cpu_rt_runtime_read(struct cgroup *cgrp, struct cftype *cft,
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struct file *file,
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char __user *buf, size_t nbytes,
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loff_t *ppos)
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{
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struct task_group *tg = cgroup_tg(cgrp);
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char tmp[64];
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long val = sched_group_rt_runtime(cgroup_tg(cgrp));
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int len = sprintf(tmp, "%ld\n", val);
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return (u64) tg->rt_ratio;
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return simple_read_from_buffer(buf, nbytes, ppos, tmp, len);
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}
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static struct cftype cpu_files[] = {
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@ -7904,9 +7985,9 @@ static struct cftype cpu_files[] = {
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.write_uint = cpu_shares_write_uint,
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},
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{
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.name = "rt_ratio",
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.read_uint = cpu_rt_ratio_read_uint,
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.write_uint = cpu_rt_ratio_write_uint,
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.name = "rt_runtime_us",
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.read = cpu_rt_runtime_read,
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.write = cpu_rt_runtime_write,
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},
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};
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@ -57,12 +57,12 @@ static inline int on_rt_rq(struct sched_rt_entity *rt_se)
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#ifdef CONFIG_FAIR_GROUP_SCHED
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static inline unsigned int sched_rt_ratio(struct rt_rq *rt_rq)
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static inline u64 sched_rt_runtime(struct rt_rq *rt_rq)
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{
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if (!rt_rq->tg)
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return SCHED_RT_FRAC;
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return RUNTIME_INF;
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return rt_rq->tg->rt_ratio;
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return rt_rq->tg->rt_runtime;
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}
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#define for_each_leaf_rt_rq(rt_rq, rq) \
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@ -89,7 +89,7 @@ static inline struct rt_rq *group_rt_rq(struct sched_rt_entity *rt_se)
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static void enqueue_rt_entity(struct sched_rt_entity *rt_se);
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static void dequeue_rt_entity(struct sched_rt_entity *rt_se);
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static void sched_rt_ratio_enqueue(struct rt_rq *rt_rq)
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static void sched_rt_rq_enqueue(struct rt_rq *rt_rq)
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{
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struct sched_rt_entity *rt_se = rt_rq->rt_se;
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@ -102,7 +102,7 @@ static void sched_rt_ratio_enqueue(struct rt_rq *rt_rq)
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}
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}
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static void sched_rt_ratio_dequeue(struct rt_rq *rt_rq)
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static void sched_rt_rq_dequeue(struct rt_rq *rt_rq)
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{
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struct sched_rt_entity *rt_se = rt_rq->rt_se;
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@ -129,9 +129,12 @@ static int rt_se_boosted(struct sched_rt_entity *rt_se)
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#else
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static inline unsigned int sched_rt_ratio(struct rt_rq *rt_rq)
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static inline u64 sched_rt_runtime(struct rt_rq *rt_rq)
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{
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return sysctl_sched_rt_ratio;
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if (sysctl_sched_rt_runtime == -1)
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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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#define for_each_leaf_rt_rq(rt_rq, rq) \
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@ -158,11 +161,11 @@ static inline struct rt_rq *group_rt_rq(struct sched_rt_entity *rt_se)
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return NULL;
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}
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static inline void sched_rt_ratio_enqueue(struct rt_rq *rt_rq)
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static inline void sched_rt_rq_enqueue(struct rt_rq *rt_rq)
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{
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}
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static inline void sched_rt_ratio_dequeue(struct rt_rq *rt_rq)
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static inline void sched_rt_rq_dequeue(struct rt_rq *rt_rq)
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{
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}
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@ -184,28 +187,24 @@ static inline int rt_se_prio(struct sched_rt_entity *rt_se)
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return rt_task_of(rt_se)->prio;
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}
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static int sched_rt_ratio_exceeded(struct rt_rq *rt_rq)
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static int sched_rt_runtime_exceeded(struct rt_rq *rt_rq)
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{
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unsigned int rt_ratio = sched_rt_ratio(rt_rq);
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u64 period, ratio;
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u64 runtime = sched_rt_runtime(rt_rq);
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if (rt_ratio == SCHED_RT_FRAC)
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if (runtime == RUNTIME_INF)
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return 0;
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if (rt_rq->rt_throttled)
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return rt_rq_throttled(rt_rq);
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period = (u64)sysctl_sched_rt_period * NSEC_PER_MSEC;
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ratio = (period * rt_ratio) >> SCHED_RT_FRAC_SHIFT;
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if (rt_rq->rt_time > ratio) {
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if (rt_rq->rt_time > runtime) {
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struct rq *rq = rq_of_rt_rq(rt_rq);
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rq->rt_throttled = 1;
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rt_rq->rt_throttled = 1;
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if (rt_rq_throttled(rt_rq)) {
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sched_rt_ratio_dequeue(rt_rq);
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sched_rt_rq_dequeue(rt_rq);
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return 1;
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}
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}
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@ -219,17 +218,16 @@ static void update_sched_rt_period(struct rq *rq)
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u64 period;
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while (rq->clock > rq->rt_period_expire) {
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period = (u64)sysctl_sched_rt_period * NSEC_PER_MSEC;
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period = (u64)sysctl_sched_rt_period * NSEC_PER_USEC;
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rq->rt_period_expire += period;
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for_each_leaf_rt_rq(rt_rq, rq) {
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unsigned long rt_ratio = sched_rt_ratio(rt_rq);
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u64 ratio = (period * rt_ratio) >> SCHED_RT_FRAC_SHIFT;
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u64 runtime = sched_rt_runtime(rt_rq);
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rt_rq->rt_time -= min(rt_rq->rt_time, ratio);
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if (rt_rq->rt_throttled) {
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rt_rq->rt_time -= min(rt_rq->rt_time, runtime);
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if (rt_rq->rt_throttled && rt_rq->rt_time < runtime) {
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rt_rq->rt_throttled = 0;
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sched_rt_ratio_enqueue(rt_rq);
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sched_rt_rq_enqueue(rt_rq);
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}
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}
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@ -262,12 +260,7 @@ static void update_curr_rt(struct rq *rq)
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cpuacct_charge(curr, delta_exec);
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rt_rq->rt_time += delta_exec;
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/*
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* might make it a tad more accurate:
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*
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* update_sched_rt_period(rq);
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*/
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if (sched_rt_ratio_exceeded(rt_rq))
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if (sched_rt_runtime_exceeded(rt_rq))
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resched_task(curr);
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}
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|
|
@ -311,22 +311,6 @@ static struct ctl_table kern_table[] = {
|
|||
.mode = 0644,
|
||||
.proc_handler = &proc_dointvec,
|
||||
},
|
||||
{
|
||||
.ctl_name = CTL_UNNUMBERED,
|
||||
.procname = "sched_rt_period_ms",
|
||||
.data = &sysctl_sched_rt_period,
|
||||
.maxlen = sizeof(unsigned int),
|
||||
.mode = 0644,
|
||||
.proc_handler = &proc_dointvec,
|
||||
},
|
||||
{
|
||||
.ctl_name = CTL_UNNUMBERED,
|
||||
.procname = "sched_rt_ratio",
|
||||
.data = &sysctl_sched_rt_ratio,
|
||||
.maxlen = sizeof(unsigned int),
|
||||
.mode = 0644,
|
||||
.proc_handler = &proc_dointvec,
|
||||
},
|
||||
#if defined(CONFIG_FAIR_GROUP_SCHED) && defined(CONFIG_SMP)
|
||||
{
|
||||
.ctl_name = CTL_UNNUMBERED,
|
||||
|
|
@ -346,6 +330,22 @@ static struct ctl_table kern_table[] = {
|
|||
},
|
||||
#endif
|
||||
#endif
|
||||
{
|
||||
.ctl_name = CTL_UNNUMBERED,
|
||||
.procname = "sched_rt_period_us",
|
||||
.data = &sysctl_sched_rt_period,
|
||||
.maxlen = sizeof(unsigned int),
|
||||
.mode = 0644,
|
||||
.proc_handler = &proc_dointvec,
|
||||
},
|
||||
{
|
||||
.ctl_name = CTL_UNNUMBERED,
|
||||
.procname = "sched_rt_runtime_us",
|
||||
.data = &sysctl_sched_rt_runtime,
|
||||
.maxlen = sizeof(int),
|
||||
.mode = 0644,
|
||||
.proc_handler = &proc_dointvec,
|
||||
},
|
||||
{
|
||||
.ctl_name = CTL_UNNUMBERED,
|
||||
.procname = "sched_compat_yield",
|
||||
|
|
|
|||
|
|
@ -164,9 +164,37 @@ static ssize_t cpu_shares_store(struct kobject *kobj,
|
|||
static struct kobj_attribute cpu_share_attr =
|
||||
__ATTR(cpu_share, 0644, cpu_shares_show, cpu_shares_store);
|
||||
|
||||
static ssize_t cpu_rt_runtime_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_runtime(up->tg));
|
||||
}
|
||||
|
||||
static ssize_t cpu_rt_runtime_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_runtime;
|
||||
int rc;
|
||||
|
||||
sscanf(buf, "%lu", &rt_runtime);
|
||||
|
||||
rc = sched_group_set_rt_runtime(up->tg, rt_runtime);
|
||||
|
||||
return (rc ? rc : size);
|
||||
}
|
||||
|
||||
static struct kobj_attribute cpu_rt_runtime_attr =
|
||||
__ATTR(cpu_rt_runtime, 0644, cpu_rt_runtime_show, cpu_rt_runtime_store);
|
||||
|
||||
/* default attributes per uid directory */
|
||||
static struct attribute *uids_attributes[] = {
|
||||
&cpu_share_attr.attr,
|
||||
&cpu_rt_runtime_attr.attr,
|
||||
NULL
|
||||
};
|
||||
|
||||
|
|
|
|||
Reference in New Issue