2 #include <linux/sched.h>
3 #include <linux/sched/sysctl.h>
4 #include <linux/sched/rt.h>
5 #include <linux/sched/deadline.h>
6 #include <linux/binfmts.h>
7 #include <linux/mutex.h>
8 #include <linux/spinlock.h>
9 #include <linux/stop_machine.h>
10 #include <linux/irq_work.h>
11 #include <linux/tick.h>
12 #include <linux/slab.h>
15 #include "cpudeadline.h"
21 /* task_struct::on_rq states: */
22 #define TASK_ON_RQ_QUEUED 1
23 #define TASK_ON_RQ_MIGRATING 2
25 extern __read_mostly int scheduler_running;
27 extern unsigned long calc_load_update;
28 extern atomic_long_t calc_load_tasks;
30 extern void calc_global_load_tick(struct rq *this_rq);
31 extern long calc_load_fold_active(struct rq *this_rq, long adjust);
34 extern void cpu_load_update_active(struct rq *this_rq);
36 static inline void cpu_load_update_active(struct rq *this_rq) { }
40 * Helpers for converting nanosecond timing to jiffy resolution
42 #define NS_TO_JIFFIES(TIME) ((unsigned long)(TIME) / (NSEC_PER_SEC / HZ))
45 * Increase resolution of nice-level calculations for 64-bit architectures.
46 * The extra resolution improves shares distribution and load balancing of
47 * low-weight task groups (eg. nice +19 on an autogroup), deeper taskgroup
48 * hierarchies, especially on larger systems. This is not a user-visible change
49 * and does not change the user-interface for setting shares/weights.
51 * We increase resolution only if we have enough bits to allow this increased
52 * resolution (i.e. 64bit). The costs for increasing resolution when 32bit are
53 * pretty high and the returns do not justify the increased costs.
55 * Really only required when CONFIG_FAIR_GROUP_SCHED is also set, but to
56 * increase coverage and consistency always enable it on 64bit platforms.
59 # define NICE_0_LOAD_SHIFT (SCHED_FIXEDPOINT_SHIFT + SCHED_FIXEDPOINT_SHIFT)
60 # define scale_load(w) ((w) << SCHED_FIXEDPOINT_SHIFT)
61 # define scale_load_down(w) ((w) >> SCHED_FIXEDPOINT_SHIFT)
63 # define NICE_0_LOAD_SHIFT (SCHED_FIXEDPOINT_SHIFT)
64 # define scale_load(w) (w)
65 # define scale_load_down(w) (w)
69 * Task weight (visible to users) and its load (invisible to users) have
70 * independent resolution, but they should be well calibrated. We use
71 * scale_load() and scale_load_down(w) to convert between them. The
72 * following must be true:
74 * scale_load(sched_prio_to_weight[USER_PRIO(NICE_TO_PRIO(0))]) == NICE_0_LOAD
77 #define NICE_0_LOAD (1L << NICE_0_LOAD_SHIFT)
80 * Single value that decides SCHED_DEADLINE internal math precision.
81 * 10 -> just above 1us
82 * 9 -> just above 0.5us
87 * These are the 'tuning knobs' of the scheduler:
91 * single value that denotes runtime == period, ie unlimited time.
93 #define RUNTIME_INF ((u64)~0ULL)
95 static inline int idle_policy(int policy)
97 return policy == SCHED_IDLE;
99 static inline int fair_policy(int policy)
101 return policy == SCHED_NORMAL || policy == SCHED_BATCH;
104 static inline int rt_policy(int policy)
106 return policy == SCHED_FIFO || policy == SCHED_RR;
109 static inline int dl_policy(int policy)
111 return policy == SCHED_DEADLINE;
113 static inline bool valid_policy(int policy)
115 return idle_policy(policy) || fair_policy(policy) ||
116 rt_policy(policy) || dl_policy(policy);
119 static inline int task_has_rt_policy(struct task_struct *p)
121 return rt_policy(p->policy);
124 static inline int task_has_dl_policy(struct task_struct *p)
126 return dl_policy(p->policy);
130 * Tells if entity @a should preempt entity @b.
133 dl_entity_preempt(struct sched_dl_entity *a, struct sched_dl_entity *b)
135 return dl_time_before(a->deadline, b->deadline);
139 * This is the priority-queue data structure of the RT scheduling class:
141 struct rt_prio_array {
142 DECLARE_BITMAP(bitmap, MAX_RT_PRIO+1); /* include 1 bit for delimiter */
143 struct list_head queue[MAX_RT_PRIO];
146 struct rt_bandwidth {
147 /* nests inside the rq lock: */
148 raw_spinlock_t rt_runtime_lock;
151 struct hrtimer rt_period_timer;
152 unsigned int rt_period_active;
155 void __dl_clear_params(struct task_struct *p);
158 * To keep the bandwidth of -deadline tasks and groups under control
159 * we need some place where:
160 * - store the maximum -deadline bandwidth of the system (the group);
161 * - cache the fraction of that bandwidth that is currently allocated.
163 * This is all done in the data structure below. It is similar to the
164 * one used for RT-throttling (rt_bandwidth), with the main difference
165 * that, since here we are only interested in admission control, we
166 * do not decrease any runtime while the group "executes", neither we
167 * need a timer to replenish it.
169 * With respect to SMP, the bandwidth is given on a per-CPU basis,
171 * - dl_bw (< 100%) is the bandwidth of the system (group) on each CPU;
172 * - dl_total_bw array contains, in the i-eth element, the currently
173 * allocated bandwidth on the i-eth CPU.
174 * Moreover, groups consume bandwidth on each CPU, while tasks only
175 * consume bandwidth on the CPU they're running on.
176 * Finally, dl_total_bw_cpu is used to cache the index of dl_total_bw
177 * that will be shown the next time the proc or cgroup controls will
178 * be red. It on its turn can be changed by writing on its own
181 struct dl_bandwidth {
182 raw_spinlock_t dl_runtime_lock;
187 static inline int dl_bandwidth_enabled(void)
189 return sysctl_sched_rt_runtime >= 0;
192 extern struct dl_bw *dl_bw_of(int i);
200 void __dl_clear(struct dl_bw *dl_b, u64 tsk_bw)
202 dl_b->total_bw -= tsk_bw;
206 void __dl_add(struct dl_bw *dl_b, u64 tsk_bw)
208 dl_b->total_bw += tsk_bw;
212 bool __dl_overflow(struct dl_bw *dl_b, int cpus, u64 old_bw, u64 new_bw)
214 return dl_b->bw != -1 &&
215 dl_b->bw * cpus < dl_b->total_bw - old_bw + new_bw;
218 extern struct mutex sched_domains_mutex;
220 #ifdef CONFIG_CGROUP_SCHED
222 #include <linux/cgroup.h>
227 extern struct list_head task_groups;
229 struct cfs_bandwidth {
230 #ifdef CONFIG_CFS_BANDWIDTH
234 s64 hierarchical_quota;
237 int idle, period_active;
238 struct hrtimer period_timer, slack_timer;
239 struct list_head throttled_cfs_rq;
242 int nr_periods, nr_throttled;
247 /* task group related information */
249 struct cgroup_subsys_state css;
251 #ifdef CONFIG_FAIR_GROUP_SCHED
252 /* schedulable entities of this group on each cpu */
253 struct sched_entity **se;
254 /* runqueue "owned" by this group on each cpu */
255 struct cfs_rq **cfs_rq;
256 unsigned long shares;
260 * load_avg can be heavily contended at clock tick time, so put
261 * it in its own cacheline separated from the fields above which
262 * will also be accessed at each tick.
264 atomic_long_t load_avg ____cacheline_aligned;
268 #ifdef CONFIG_RT_GROUP_SCHED
269 struct sched_rt_entity **rt_se;
270 struct rt_rq **rt_rq;
272 struct rt_bandwidth rt_bandwidth;
276 struct list_head list;
278 struct task_group *parent;
279 struct list_head siblings;
280 struct list_head children;
282 #ifdef CONFIG_SCHED_AUTOGROUP
283 struct autogroup *autogroup;
286 struct cfs_bandwidth cfs_bandwidth;
289 #ifdef CONFIG_FAIR_GROUP_SCHED
290 #define ROOT_TASK_GROUP_LOAD NICE_0_LOAD
293 * A weight of 0 or 1 can cause arithmetics problems.
294 * A weight of a cfs_rq is the sum of weights of which entities
295 * are queued on this cfs_rq, so a weight of a entity should not be
296 * too large, so as the shares value of a task group.
297 * (The default weight is 1024 - so there's no practical
298 * limitation from this.)
300 #define MIN_SHARES (1UL << 1)
301 #define MAX_SHARES (1UL << 18)
304 typedef int (*tg_visitor)(struct task_group *, void *);
306 extern int walk_tg_tree_from(struct task_group *from,
307 tg_visitor down, tg_visitor up, void *data);
310 * Iterate the full tree, calling @down when first entering a node and @up when
311 * leaving it for the final time.
313 * Caller must hold rcu_lock or sufficient equivalent.
315 static inline int walk_tg_tree(tg_visitor down, tg_visitor up, void *data)
317 return walk_tg_tree_from(&root_task_group, down, up, data);
320 extern int tg_nop(struct task_group *tg, void *data);
322 extern void free_fair_sched_group(struct task_group *tg);
323 extern int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent);
324 extern void unregister_fair_sched_group(struct task_group *tg);
325 extern void init_tg_cfs_entry(struct task_group *tg, struct cfs_rq *cfs_rq,
326 struct sched_entity *se, int cpu,
327 struct sched_entity *parent);
328 extern void init_cfs_bandwidth(struct cfs_bandwidth *cfs_b);
330 extern void __refill_cfs_bandwidth_runtime(struct cfs_bandwidth *cfs_b);
331 extern void start_cfs_bandwidth(struct cfs_bandwidth *cfs_b);
332 extern void unthrottle_cfs_rq(struct cfs_rq *cfs_rq);
334 extern void free_rt_sched_group(struct task_group *tg);
335 extern int alloc_rt_sched_group(struct task_group *tg, struct task_group *parent);
336 extern void init_tg_rt_entry(struct task_group *tg, struct rt_rq *rt_rq,
337 struct sched_rt_entity *rt_se, int cpu,
338 struct sched_rt_entity *parent);
340 extern struct task_group *sched_create_group(struct task_group *parent);
341 extern void sched_online_group(struct task_group *tg,
342 struct task_group *parent);
343 extern void sched_destroy_group(struct task_group *tg);
344 extern void sched_offline_group(struct task_group *tg);
346 extern void sched_move_task(struct task_struct *tsk);
348 #ifdef CONFIG_FAIR_GROUP_SCHED
349 extern int sched_group_set_shares(struct task_group *tg, unsigned long shares);
352 extern void set_task_rq_fair(struct sched_entity *se,
353 struct cfs_rq *prev, struct cfs_rq *next);
354 #else /* !CONFIG_SMP */
355 static inline void set_task_rq_fair(struct sched_entity *se,
356 struct cfs_rq *prev, struct cfs_rq *next) { }
357 #endif /* CONFIG_SMP */
358 #endif /* CONFIG_FAIR_GROUP_SCHED */
360 #else /* CONFIG_CGROUP_SCHED */
362 struct cfs_bandwidth { };
364 #endif /* CONFIG_CGROUP_SCHED */
366 /* CFS-related fields in a runqueue */
368 struct load_weight load;
369 unsigned int nr_running, h_nr_running;
374 u64 min_vruntime_copy;
377 struct rb_root tasks_timeline;
378 struct rb_node *rb_leftmost;
381 * 'curr' points to currently running entity on this cfs_rq.
382 * It is set to NULL otherwise (i.e when none are currently running).
384 struct sched_entity *curr, *next, *last, *skip;
386 #ifdef CONFIG_SCHED_DEBUG
387 unsigned int nr_spread_over;
394 struct sched_avg avg;
395 u64 runnable_load_sum;
396 unsigned long runnable_load_avg;
397 #ifdef CONFIG_FAIR_GROUP_SCHED
398 unsigned long tg_load_avg_contrib;
400 atomic_long_t removed_load_avg, removed_util_avg;
402 u64 load_last_update_time_copy;
405 #ifdef CONFIG_FAIR_GROUP_SCHED
407 * h_load = weight * f(tg)
409 * Where f(tg) is the recursive weight fraction assigned to
412 unsigned long h_load;
413 u64 last_h_load_update;
414 struct sched_entity *h_load_next;
415 #endif /* CONFIG_FAIR_GROUP_SCHED */
416 #endif /* CONFIG_SMP */
418 #ifdef CONFIG_FAIR_GROUP_SCHED
419 struct rq *rq; /* cpu runqueue to which this cfs_rq is attached */
422 * leaf cfs_rqs are those that hold tasks (lowest schedulable entity in
423 * a hierarchy). Non-leaf lrqs hold other higher schedulable entities
424 * (like users, containers etc.)
426 * leaf_cfs_rq_list ties together list of leaf cfs_rq's in a cpu. This
427 * list is used during load balance.
430 struct list_head leaf_cfs_rq_list;
431 struct task_group *tg; /* group that "owns" this runqueue */
433 #ifdef CONFIG_CFS_BANDWIDTH
436 s64 runtime_remaining;
438 u64 throttled_clock, throttled_clock_task;
439 u64 throttled_clock_task_time;
440 int throttled, throttle_count, throttle_uptodate;
441 struct list_head throttled_list;
442 #endif /* CONFIG_CFS_BANDWIDTH */
443 #endif /* CONFIG_FAIR_GROUP_SCHED */
446 static inline int rt_bandwidth_enabled(void)
448 return sysctl_sched_rt_runtime >= 0;
451 /* RT IPI pull logic requires IRQ_WORK */
452 #ifdef CONFIG_IRQ_WORK
453 # define HAVE_RT_PUSH_IPI
456 /* Real-Time classes' related field in a runqueue: */
458 struct rt_prio_array active;
459 unsigned int rt_nr_running;
460 unsigned int rr_nr_running;
461 #if defined CONFIG_SMP || defined CONFIG_RT_GROUP_SCHED
463 int curr; /* highest queued rt task prio */
465 int next; /* next highest */
470 unsigned long rt_nr_migratory;
471 unsigned long rt_nr_total;
473 struct plist_head pushable_tasks;
474 #ifdef HAVE_RT_PUSH_IPI
477 struct irq_work push_work;
478 raw_spinlock_t push_lock;
480 #endif /* CONFIG_SMP */
486 /* Nests inside the rq lock: */
487 raw_spinlock_t rt_runtime_lock;
489 #ifdef CONFIG_RT_GROUP_SCHED
490 unsigned long rt_nr_boosted;
493 struct task_group *tg;
497 /* Deadline class' related fields in a runqueue */
499 /* runqueue is an rbtree, ordered by deadline */
500 struct rb_root rb_root;
501 struct rb_node *rb_leftmost;
503 unsigned long dl_nr_running;
507 * Deadline values of the currently executing and the
508 * earliest ready task on this rq. Caching these facilitates
509 * the decision wether or not a ready but not running task
510 * should migrate somewhere else.
517 unsigned long dl_nr_migratory;
521 * Tasks on this rq that can be pushed away. They are kept in
522 * an rb-tree, ordered by tasks' deadlines, with caching
523 * of the leftmost (earliest deadline) element.
525 struct rb_root pushable_dl_tasks_root;
526 struct rb_node *pushable_dl_tasks_leftmost;
535 * We add the notion of a root-domain which will be used to define per-domain
536 * variables. Each exclusive cpuset essentially defines an island domain by
537 * fully partitioning the member cpus from any other cpuset. Whenever a new
538 * exclusive cpuset is created, we also create and attach a new root-domain
547 cpumask_var_t online;
549 /* Indicate more than one runnable task for any CPU */
553 * The bit corresponding to a CPU gets set here if such CPU has more
554 * than one runnable -deadline task (as it is below for RT tasks).
556 cpumask_var_t dlo_mask;
562 * The "RT overload" flag: it gets set if a CPU has more than
563 * one runnable RT task.
565 cpumask_var_t rto_mask;
566 struct cpupri cpupri;
569 extern struct root_domain def_root_domain;
571 #endif /* CONFIG_SMP */
574 * This is the main, per-CPU runqueue data structure.
576 * Locking rule: those places that want to lock multiple runqueues
577 * (such as the load balancing or the thread migration code), lock
578 * acquire operations must be ordered by ascending &runqueue.
585 * nr_running and cpu_load should be in the same cacheline because
586 * remote CPUs use both these fields when doing load calculation.
588 unsigned int nr_running;
589 #ifdef CONFIG_NUMA_BALANCING
590 unsigned int nr_numa_running;
591 unsigned int nr_preferred_running;
593 #define CPU_LOAD_IDX_MAX 5
594 unsigned long cpu_load[CPU_LOAD_IDX_MAX];
595 #ifdef CONFIG_NO_HZ_COMMON
597 unsigned long last_load_update_tick;
598 #endif /* CONFIG_SMP */
600 unsigned long nohz_flags;
601 #endif /* CONFIG_NO_HZ_COMMON */
602 #ifdef CONFIG_NO_HZ_FULL
603 unsigned long last_sched_tick;
605 /* capture load from *all* tasks on this cpu: */
606 struct load_weight load;
607 unsigned long nr_load_updates;
614 #ifdef CONFIG_FAIR_GROUP_SCHED
615 /* list of leaf cfs_rq on this cpu: */
616 struct list_head leaf_cfs_rq_list;
617 #endif /* CONFIG_FAIR_GROUP_SCHED */
620 * This is part of a global counter where only the total sum
621 * over all CPUs matters. A task can increase this counter on
622 * one CPU and if it got migrated afterwards it may decrease
623 * it on another CPU. Always updated under the runqueue lock:
625 unsigned long nr_uninterruptible;
627 struct task_struct *curr, *idle, *stop;
628 unsigned long next_balance;
629 struct mm_struct *prev_mm;
631 unsigned int clock_skip_update;
638 struct root_domain *rd;
639 struct sched_domain *sd;
641 unsigned long cpu_capacity;
642 unsigned long cpu_capacity_orig;
644 struct callback_head *balance_callback;
646 unsigned char idle_balance;
647 /* For active balancing */
650 struct cpu_stop_work active_balance_work;
651 /* cpu of this runqueue: */
655 struct list_head cfs_tasks;
662 /* This is used to determine avg_idle's max value */
663 u64 max_idle_balance_cost;
666 #ifdef CONFIG_IRQ_TIME_ACCOUNTING
669 #ifdef CONFIG_PARAVIRT
672 #ifdef CONFIG_PARAVIRT_TIME_ACCOUNTING
673 u64 prev_steal_time_rq;
676 /* calc_load related fields */
677 unsigned long calc_load_update;
678 long calc_load_active;
680 #ifdef CONFIG_SCHED_HRTICK
682 int hrtick_csd_pending;
683 struct call_single_data hrtick_csd;
685 struct hrtimer hrtick_timer;
688 #ifdef CONFIG_SCHEDSTATS
690 struct sched_info rq_sched_info;
691 unsigned long long rq_cpu_time;
692 /* could above be rq->cfs_rq.exec_clock + rq->rt_rq.rt_runtime ? */
694 /* sys_sched_yield() stats */
695 unsigned int yld_count;
697 /* schedule() stats */
698 unsigned int sched_count;
699 unsigned int sched_goidle;
701 /* try_to_wake_up() stats */
702 unsigned int ttwu_count;
703 unsigned int ttwu_local;
707 struct llist_head wake_list;
710 #ifdef CONFIG_CPU_IDLE
711 /* Must be inspected within a rcu lock section */
712 struct cpuidle_state *idle_state;
716 static inline int cpu_of(struct rq *rq)
725 DECLARE_PER_CPU_SHARED_ALIGNED(struct rq, runqueues);
727 #define cpu_rq(cpu) (&per_cpu(runqueues, (cpu)))
728 #define this_rq() this_cpu_ptr(&runqueues)
729 #define task_rq(p) cpu_rq(task_cpu(p))
730 #define cpu_curr(cpu) (cpu_rq(cpu)->curr)
731 #define raw_rq() raw_cpu_ptr(&runqueues)
733 static inline u64 __rq_clock_broken(struct rq *rq)
735 return READ_ONCE(rq->clock);
738 static inline u64 rq_clock(struct rq *rq)
740 lockdep_assert_held(&rq->lock);
744 static inline u64 rq_clock_task(struct rq *rq)
746 lockdep_assert_held(&rq->lock);
747 return rq->clock_task;
750 #define RQCF_REQ_SKIP 0x01
751 #define RQCF_ACT_SKIP 0x02
753 static inline void rq_clock_skip_update(struct rq *rq, bool skip)
755 lockdep_assert_held(&rq->lock);
757 rq->clock_skip_update |= RQCF_REQ_SKIP;
759 rq->clock_skip_update &= ~RQCF_REQ_SKIP;
763 enum numa_topology_type {
768 extern enum numa_topology_type sched_numa_topology_type;
769 extern int sched_max_numa_distance;
770 extern bool find_numa_distance(int distance);
773 #ifdef CONFIG_NUMA_BALANCING
774 /* The regions in numa_faults array from task_struct */
775 enum numa_faults_stats {
781 extern void sched_setnuma(struct task_struct *p, int node);
782 extern int migrate_task_to(struct task_struct *p, int cpu);
783 extern int migrate_swap(struct task_struct *, struct task_struct *);
784 #endif /* CONFIG_NUMA_BALANCING */
789 queue_balance_callback(struct rq *rq,
790 struct callback_head *head,
791 void (*func)(struct rq *rq))
793 lockdep_assert_held(&rq->lock);
795 if (unlikely(head->next))
798 head->func = (void (*)(struct callback_head *))func;
799 head->next = rq->balance_callback;
800 rq->balance_callback = head;
803 extern void sched_ttwu_pending(void);
805 #define rcu_dereference_check_sched_domain(p) \
806 rcu_dereference_check((p), \
807 lockdep_is_held(&sched_domains_mutex))
810 * The domain tree (rq->sd) is protected by RCU's quiescent state transition.
811 * See detach_destroy_domains: synchronize_sched for details.
813 * The domain tree of any CPU may only be accessed from within
814 * preempt-disabled sections.
816 #define for_each_domain(cpu, __sd) \
817 for (__sd = rcu_dereference_check_sched_domain(cpu_rq(cpu)->sd); \
818 __sd; __sd = __sd->parent)
820 #define for_each_lower_domain(sd) for (; sd; sd = sd->child)
823 * highest_flag_domain - Return highest sched_domain containing flag.
824 * @cpu: The cpu whose highest level of sched domain is to
826 * @flag: The flag to check for the highest sched_domain
829 * Returns the highest sched_domain of a cpu which contains the given flag.
831 static inline struct sched_domain *highest_flag_domain(int cpu, int flag)
833 struct sched_domain *sd, *hsd = NULL;
835 for_each_domain(cpu, sd) {
836 if (!(sd->flags & flag))
844 static inline struct sched_domain *lowest_flag_domain(int cpu, int flag)
846 struct sched_domain *sd;
848 for_each_domain(cpu, sd) {
849 if (sd->flags & flag)
856 DECLARE_PER_CPU(struct sched_domain *, sd_llc);
857 DECLARE_PER_CPU(int, sd_llc_size);
858 DECLARE_PER_CPU(int, sd_llc_id);
859 DECLARE_PER_CPU(struct sched_domain *, sd_numa);
860 DECLARE_PER_CPU(struct sched_domain *, sd_busy);
861 DECLARE_PER_CPU(struct sched_domain *, sd_asym);
863 struct sched_group_capacity {
866 * CPU capacity of this group, SCHED_CAPACITY_SCALE being max capacity
869 unsigned int capacity;
870 unsigned long next_update;
871 int imbalance; /* XXX unrelated to capacity but shared group state */
873 * Number of busy cpus in this group.
875 atomic_t nr_busy_cpus;
877 unsigned long cpumask[0]; /* iteration mask */
881 struct sched_group *next; /* Must be a circular list */
884 unsigned int group_weight;
885 struct sched_group_capacity *sgc;
888 * The CPUs this group covers.
890 * NOTE: this field is variable length. (Allocated dynamically
891 * by attaching extra space to the end of the structure,
892 * depending on how many CPUs the kernel has booted up with)
894 unsigned long cpumask[0];
897 static inline struct cpumask *sched_group_cpus(struct sched_group *sg)
899 return to_cpumask(sg->cpumask);
903 * cpumask masking which cpus in the group are allowed to iterate up the domain
906 static inline struct cpumask *sched_group_mask(struct sched_group *sg)
908 return to_cpumask(sg->sgc->cpumask);
912 * group_first_cpu - Returns the first cpu in the cpumask of a sched_group.
913 * @group: The group whose first cpu is to be returned.
915 static inline unsigned int group_first_cpu(struct sched_group *group)
917 return cpumask_first(sched_group_cpus(group));
920 extern int group_balance_cpu(struct sched_group *sg);
922 #if defined(CONFIG_SCHED_DEBUG) && defined(CONFIG_SYSCTL)
923 void register_sched_domain_sysctl(void);
924 void unregister_sched_domain_sysctl(void);
926 static inline void register_sched_domain_sysctl(void)
929 static inline void unregister_sched_domain_sysctl(void)
936 static inline void sched_ttwu_pending(void) { }
938 #endif /* CONFIG_SMP */
941 #include "auto_group.h"
943 #ifdef CONFIG_CGROUP_SCHED
946 * Return the group to which this tasks belongs.
948 * We cannot use task_css() and friends because the cgroup subsystem
949 * changes that value before the cgroup_subsys::attach() method is called,
950 * therefore we cannot pin it and might observe the wrong value.
952 * The same is true for autogroup's p->signal->autogroup->tg, the autogroup
953 * core changes this before calling sched_move_task().
955 * Instead we use a 'copy' which is updated from sched_move_task() while
956 * holding both task_struct::pi_lock and rq::lock.
958 static inline struct task_group *task_group(struct task_struct *p)
960 return p->sched_task_group;
963 /* Change a task's cfs_rq and parent entity if it moves across CPUs/groups */
964 static inline void set_task_rq(struct task_struct *p, unsigned int cpu)
966 #if defined(CONFIG_FAIR_GROUP_SCHED) || defined(CONFIG_RT_GROUP_SCHED)
967 struct task_group *tg = task_group(p);
970 #ifdef CONFIG_FAIR_GROUP_SCHED
971 set_task_rq_fair(&p->se, p->se.cfs_rq, tg->cfs_rq[cpu]);
972 p->se.cfs_rq = tg->cfs_rq[cpu];
973 p->se.parent = tg->se[cpu];
976 #ifdef CONFIG_RT_GROUP_SCHED
977 p->rt.rt_rq = tg->rt_rq[cpu];
978 p->rt.parent = tg->rt_se[cpu];
982 #else /* CONFIG_CGROUP_SCHED */
984 static inline void set_task_rq(struct task_struct *p, unsigned int cpu) { }
985 static inline struct task_group *task_group(struct task_struct *p)
990 #endif /* CONFIG_CGROUP_SCHED */
992 static inline void __set_task_cpu(struct task_struct *p, unsigned int cpu)
997 * After ->cpu is set up to a new value, task_rq_lock(p, ...) can be
998 * successfuly executed on another CPU. We must ensure that updates of
999 * per-task data have been completed by this moment.
1002 task_thread_info(p)->cpu = cpu;
1008 * Tunables that become constants when CONFIG_SCHED_DEBUG is off:
1010 #ifdef CONFIG_SCHED_DEBUG
1011 # include <linux/static_key.h>
1012 # define const_debug __read_mostly
1014 # define const_debug const
1017 extern const_debug unsigned int sysctl_sched_features;
1019 #define SCHED_FEAT(name, enabled) \
1020 __SCHED_FEAT_##name ,
1023 #include "features.h"
1029 #if defined(CONFIG_SCHED_DEBUG) && defined(HAVE_JUMP_LABEL)
1030 #define SCHED_FEAT(name, enabled) \
1031 static __always_inline bool static_branch_##name(struct static_key *key) \
1033 return static_key_##enabled(key); \
1036 #include "features.h"
1040 extern struct static_key sched_feat_keys[__SCHED_FEAT_NR];
1041 #define sched_feat(x) (static_branch_##x(&sched_feat_keys[__SCHED_FEAT_##x]))
1042 #else /* !(SCHED_DEBUG && HAVE_JUMP_LABEL) */
1043 #define sched_feat(x) (sysctl_sched_features & (1UL << __SCHED_FEAT_##x))
1044 #endif /* SCHED_DEBUG && HAVE_JUMP_LABEL */
1046 extern struct static_key_false sched_numa_balancing;
1047 extern struct static_key_false sched_schedstats;
1049 static inline u64 global_rt_period(void)
1051 return (u64)sysctl_sched_rt_period * NSEC_PER_USEC;
1054 static inline u64 global_rt_runtime(void)
1056 if (sysctl_sched_rt_runtime < 0)
1059 return (u64)sysctl_sched_rt_runtime * NSEC_PER_USEC;
1062 static inline int task_current(struct rq *rq, struct task_struct *p)
1064 return rq->curr == p;
1067 static inline int task_running(struct rq *rq, struct task_struct *p)
1072 return task_current(rq, p);
1076 static inline int task_on_rq_queued(struct task_struct *p)
1078 return p->on_rq == TASK_ON_RQ_QUEUED;
1081 static inline int task_on_rq_migrating(struct task_struct *p)
1083 return p->on_rq == TASK_ON_RQ_MIGRATING;
1086 #ifndef prepare_arch_switch
1087 # define prepare_arch_switch(next) do { } while (0)
1089 #ifndef finish_arch_post_lock_switch
1090 # define finish_arch_post_lock_switch() do { } while (0)
1093 static inline void prepare_lock_switch(struct rq *rq, struct task_struct *next)
1097 * We can optimise this out completely for !SMP, because the
1098 * SMP rebalancing from interrupt is the only thing that cares
1105 static inline void finish_lock_switch(struct rq *rq, struct task_struct *prev)
1109 * After ->on_cpu is cleared, the task can be moved to a different CPU.
1110 * We must ensure this doesn't happen until the switch is completely
1113 * In particular, the load of prev->state in finish_task_switch() must
1114 * happen before this.
1116 * Pairs with the smp_cond_acquire() in try_to_wake_up().
1118 smp_store_release(&prev->on_cpu, 0);
1120 #ifdef CONFIG_DEBUG_SPINLOCK
1121 /* this is a valid case when another task releases the spinlock */
1122 rq->lock.owner = current;
1125 * If we are tracking spinlock dependencies then we have to
1126 * fix up the runqueue lock - which gets 'carried over' from
1127 * prev into current:
1129 spin_acquire(&rq->lock.dep_map, 0, 0, _THIS_IP_);
1131 raw_spin_unlock_irq(&rq->lock);
1137 #define WF_SYNC 0x01 /* waker goes to sleep after wakeup */
1138 #define WF_FORK 0x02 /* child wakeup after fork */
1139 #define WF_MIGRATED 0x4 /* internal use, task got migrated */
1142 * To aid in avoiding the subversion of "niceness" due to uneven distribution
1143 * of tasks with abnormal "nice" values across CPUs the contribution that
1144 * each task makes to its run queue's load is weighted according to its
1145 * scheduling class and "nice" value. For SCHED_NORMAL tasks this is just a
1146 * scaled version of the new time slice allocation that they receive on time
1150 #define WEIGHT_IDLEPRIO 3
1151 #define WMULT_IDLEPRIO 1431655765
1153 extern const int sched_prio_to_weight[40];
1154 extern const u32 sched_prio_to_wmult[40];
1157 * {de,en}queue flags:
1159 * DEQUEUE_SLEEP - task is no longer runnable
1160 * ENQUEUE_WAKEUP - task just became runnable
1162 * SAVE/RESTORE - an otherwise spurious dequeue/enqueue, done to ensure tasks
1163 * are in a known state which allows modification. Such pairs
1164 * should preserve as much state as possible.
1166 * MOVE - paired with SAVE/RESTORE, explicitly does not preserve the location
1169 * ENQUEUE_HEAD - place at front of runqueue (tail if not specified)
1170 * ENQUEUE_REPLENISH - CBS (replenish runtime and postpone deadline)
1171 * ENQUEUE_MIGRATED - the task was migrated during wakeup
1175 #define DEQUEUE_SLEEP 0x01
1176 #define DEQUEUE_SAVE 0x02 /* matches ENQUEUE_RESTORE */
1177 #define DEQUEUE_MOVE 0x04 /* matches ENQUEUE_MOVE */
1179 #define ENQUEUE_WAKEUP 0x01
1180 #define ENQUEUE_RESTORE 0x02
1181 #define ENQUEUE_MOVE 0x04
1183 #define ENQUEUE_HEAD 0x08
1184 #define ENQUEUE_REPLENISH 0x10
1186 #define ENQUEUE_MIGRATED 0x20
1188 #define ENQUEUE_MIGRATED 0x00
1191 #define RETRY_TASK ((void *)-1UL)
1193 struct sched_class {
1194 const struct sched_class *next;
1196 void (*enqueue_task) (struct rq *rq, struct task_struct *p, int flags);
1197 void (*dequeue_task) (struct rq *rq, struct task_struct *p, int flags);
1198 void (*yield_task) (struct rq *rq);
1199 bool (*yield_to_task) (struct rq *rq, struct task_struct *p, bool preempt);
1201 void (*check_preempt_curr) (struct rq *rq, struct task_struct *p, int flags);
1204 * It is the responsibility of the pick_next_task() method that will
1205 * return the next task to call put_prev_task() on the @prev task or
1206 * something equivalent.
1208 * May return RETRY_TASK when it finds a higher prio class has runnable
1211 struct task_struct * (*pick_next_task) (struct rq *rq,
1212 struct task_struct *prev,
1213 struct pin_cookie cookie);
1214 void (*put_prev_task) (struct rq *rq, struct task_struct *p);
1217 int (*select_task_rq)(struct task_struct *p, int task_cpu, int sd_flag, int flags);
1218 void (*migrate_task_rq)(struct task_struct *p);
1220 void (*task_woken) (struct rq *this_rq, struct task_struct *task);
1222 void (*set_cpus_allowed)(struct task_struct *p,
1223 const struct cpumask *newmask);
1225 void (*rq_online)(struct rq *rq);
1226 void (*rq_offline)(struct rq *rq);
1229 void (*set_curr_task) (struct rq *rq);
1230 void (*task_tick) (struct rq *rq, struct task_struct *p, int queued);
1231 void (*task_fork) (struct task_struct *p);
1232 void (*task_dead) (struct task_struct *p);
1235 * The switched_from() call is allowed to drop rq->lock, therefore we
1236 * cannot assume the switched_from/switched_to pair is serliazed by
1237 * rq->lock. They are however serialized by p->pi_lock.
1239 void (*switched_from) (struct rq *this_rq, struct task_struct *task);
1240 void (*switched_to) (struct rq *this_rq, struct task_struct *task);
1241 void (*prio_changed) (struct rq *this_rq, struct task_struct *task,
1244 unsigned int (*get_rr_interval) (struct rq *rq,
1245 struct task_struct *task);
1247 void (*update_curr) (struct rq *rq);
1249 #ifdef CONFIG_FAIR_GROUP_SCHED
1250 void (*task_move_group) (struct task_struct *p);
1254 static inline void put_prev_task(struct rq *rq, struct task_struct *prev)
1256 prev->sched_class->put_prev_task(rq, prev);
1259 #define sched_class_highest (&stop_sched_class)
1260 #define for_each_class(class) \
1261 for (class = sched_class_highest; class; class = class->next)
1263 extern const struct sched_class stop_sched_class;
1264 extern const struct sched_class dl_sched_class;
1265 extern const struct sched_class rt_sched_class;
1266 extern const struct sched_class fair_sched_class;
1267 extern const struct sched_class idle_sched_class;
1272 extern void update_group_capacity(struct sched_domain *sd, int cpu);
1274 extern void trigger_load_balance(struct rq *rq);
1276 extern void set_cpus_allowed_common(struct task_struct *p, const struct cpumask *new_mask);
1280 #ifdef CONFIG_CPU_IDLE
1281 static inline void idle_set_state(struct rq *rq,
1282 struct cpuidle_state *idle_state)
1284 rq->idle_state = idle_state;
1287 static inline struct cpuidle_state *idle_get_state(struct rq *rq)
1289 WARN_ON(!rcu_read_lock_held());
1290 return rq->idle_state;
1293 static inline void idle_set_state(struct rq *rq,
1294 struct cpuidle_state *idle_state)
1298 static inline struct cpuidle_state *idle_get_state(struct rq *rq)
1304 extern void sysrq_sched_debug_show(void);
1305 extern void sched_init_granularity(void);
1306 extern void update_max_interval(void);
1308 extern void init_sched_dl_class(void);
1309 extern void init_sched_rt_class(void);
1310 extern void init_sched_fair_class(void);
1312 extern void resched_curr(struct rq *rq);
1313 extern void resched_cpu(int cpu);
1315 extern struct rt_bandwidth def_rt_bandwidth;
1316 extern void init_rt_bandwidth(struct rt_bandwidth *rt_b, u64 period, u64 runtime);
1318 extern struct dl_bandwidth def_dl_bandwidth;
1319 extern void init_dl_bandwidth(struct dl_bandwidth *dl_b, u64 period, u64 runtime);
1320 extern void init_dl_task_timer(struct sched_dl_entity *dl_se);
1322 unsigned long to_ratio(u64 period, u64 runtime);
1324 extern void init_entity_runnable_average(struct sched_entity *se);
1325 extern void post_init_entity_util_avg(struct sched_entity *se);
1327 #ifdef CONFIG_NO_HZ_FULL
1328 extern bool sched_can_stop_tick(struct rq *rq);
1331 * Tick may be needed by tasks in the runqueue depending on their policy and
1332 * requirements. If tick is needed, lets send the target an IPI to kick it out of
1333 * nohz mode if necessary.
1335 static inline void sched_update_tick_dependency(struct rq *rq)
1339 if (!tick_nohz_full_enabled())
1344 if (!tick_nohz_full_cpu(cpu))
1347 if (sched_can_stop_tick(rq))
1348 tick_nohz_dep_clear_cpu(cpu, TICK_DEP_BIT_SCHED);
1350 tick_nohz_dep_set_cpu(cpu, TICK_DEP_BIT_SCHED);
1353 static inline void sched_update_tick_dependency(struct rq *rq) { }
1356 static inline void add_nr_running(struct rq *rq, unsigned count)
1358 unsigned prev_nr = rq->nr_running;
1360 rq->nr_running = prev_nr + count;
1362 if (prev_nr < 2 && rq->nr_running >= 2) {
1364 if (!rq->rd->overload)
1365 rq->rd->overload = true;
1369 sched_update_tick_dependency(rq);
1372 static inline void sub_nr_running(struct rq *rq, unsigned count)
1374 rq->nr_running -= count;
1375 /* Check if we still need preemption */
1376 sched_update_tick_dependency(rq);
1379 static inline void rq_last_tick_reset(struct rq *rq)
1381 #ifdef CONFIG_NO_HZ_FULL
1382 rq->last_sched_tick = jiffies;
1386 extern void update_rq_clock(struct rq *rq);
1388 extern void activate_task(struct rq *rq, struct task_struct *p, int flags);
1389 extern void deactivate_task(struct rq *rq, struct task_struct *p, int flags);
1391 extern void check_preempt_curr(struct rq *rq, struct task_struct *p, int flags);
1393 extern const_debug unsigned int sysctl_sched_time_avg;
1394 extern const_debug unsigned int sysctl_sched_nr_migrate;
1395 extern const_debug unsigned int sysctl_sched_migration_cost;
1397 static inline u64 sched_avg_period(void)
1399 return (u64)sysctl_sched_time_avg * NSEC_PER_MSEC / 2;
1402 #ifdef CONFIG_SCHED_HRTICK
1406 * - enabled by features
1407 * - hrtimer is actually high res
1409 static inline int hrtick_enabled(struct rq *rq)
1411 if (!sched_feat(HRTICK))
1413 if (!cpu_active(cpu_of(rq)))
1415 return hrtimer_is_hres_active(&rq->hrtick_timer);
1418 void hrtick_start(struct rq *rq, u64 delay);
1422 static inline int hrtick_enabled(struct rq *rq)
1427 #endif /* CONFIG_SCHED_HRTICK */
1430 extern void sched_avg_update(struct rq *rq);
1432 #ifndef arch_scale_freq_capacity
1433 static __always_inline
1434 unsigned long arch_scale_freq_capacity(struct sched_domain *sd, int cpu)
1436 return SCHED_CAPACITY_SCALE;
1440 #ifndef arch_scale_cpu_capacity
1441 static __always_inline
1442 unsigned long arch_scale_cpu_capacity(struct sched_domain *sd, int cpu)
1444 if (sd && (sd->flags & SD_SHARE_CPUCAPACITY) && (sd->span_weight > 1))
1445 return sd->smt_gain / sd->span_weight;
1447 return SCHED_CAPACITY_SCALE;
1451 static inline void sched_rt_avg_update(struct rq *rq, u64 rt_delta)
1453 rq->rt_avg += rt_delta * arch_scale_freq_capacity(NULL, cpu_of(rq));
1454 sched_avg_update(rq);
1457 static inline void sched_rt_avg_update(struct rq *rq, u64 rt_delta) { }
1458 static inline void sched_avg_update(struct rq *rq) { }
1462 unsigned long flags;
1463 struct pin_cookie cookie;
1466 struct rq *__task_rq_lock(struct task_struct *p, struct rq_flags *rf)
1467 __acquires(rq->lock);
1468 struct rq *task_rq_lock(struct task_struct *p, struct rq_flags *rf)
1469 __acquires(p->pi_lock)
1470 __acquires(rq->lock);
1472 static inline void __task_rq_unlock(struct rq *rq, struct rq_flags *rf)
1473 __releases(rq->lock)
1475 lockdep_unpin_lock(&rq->lock, rf->cookie);
1476 raw_spin_unlock(&rq->lock);
1480 task_rq_unlock(struct rq *rq, struct task_struct *p, struct rq_flags *rf)
1481 __releases(rq->lock)
1482 __releases(p->pi_lock)
1484 lockdep_unpin_lock(&rq->lock, rf->cookie);
1485 raw_spin_unlock(&rq->lock);
1486 raw_spin_unlock_irqrestore(&p->pi_lock, rf->flags);
1490 #ifdef CONFIG_PREEMPT
1492 static inline void double_rq_lock(struct rq *rq1, struct rq *rq2);
1495 * fair double_lock_balance: Safely acquires both rq->locks in a fair
1496 * way at the expense of forcing extra atomic operations in all
1497 * invocations. This assures that the double_lock is acquired using the
1498 * same underlying policy as the spinlock_t on this architecture, which
1499 * reduces latency compared to the unfair variant below. However, it
1500 * also adds more overhead and therefore may reduce throughput.
1502 static inline int _double_lock_balance(struct rq *this_rq, struct rq *busiest)
1503 __releases(this_rq->lock)
1504 __acquires(busiest->lock)
1505 __acquires(this_rq->lock)
1507 raw_spin_unlock(&this_rq->lock);
1508 double_rq_lock(this_rq, busiest);
1515 * Unfair double_lock_balance: Optimizes throughput at the expense of
1516 * latency by eliminating extra atomic operations when the locks are
1517 * already in proper order on entry. This favors lower cpu-ids and will
1518 * grant the double lock to lower cpus over higher ids under contention,
1519 * regardless of entry order into the function.
1521 static inline int _double_lock_balance(struct rq *this_rq, struct rq *busiest)
1522 __releases(this_rq->lock)
1523 __acquires(busiest->lock)
1524 __acquires(this_rq->lock)
1528 if (unlikely(!raw_spin_trylock(&busiest->lock))) {
1529 if (busiest < this_rq) {
1530 raw_spin_unlock(&this_rq->lock);
1531 raw_spin_lock(&busiest->lock);
1532 raw_spin_lock_nested(&this_rq->lock,
1533 SINGLE_DEPTH_NESTING);
1536 raw_spin_lock_nested(&busiest->lock,
1537 SINGLE_DEPTH_NESTING);
1542 #endif /* CONFIG_PREEMPT */
1545 * double_lock_balance - lock the busiest runqueue, this_rq is locked already.
1547 static inline int double_lock_balance(struct rq *this_rq, struct rq *busiest)
1549 if (unlikely(!irqs_disabled())) {
1550 /* printk() doesn't work good under rq->lock */
1551 raw_spin_unlock(&this_rq->lock);
1555 return _double_lock_balance(this_rq, busiest);
1558 static inline void double_unlock_balance(struct rq *this_rq, struct rq *busiest)
1559 __releases(busiest->lock)
1561 raw_spin_unlock(&busiest->lock);
1562 lock_set_subclass(&this_rq->lock.dep_map, 0, _RET_IP_);
1565 static inline void double_lock(spinlock_t *l1, spinlock_t *l2)
1571 spin_lock_nested(l2, SINGLE_DEPTH_NESTING);
1574 static inline void double_lock_irq(spinlock_t *l1, spinlock_t *l2)
1580 spin_lock_nested(l2, SINGLE_DEPTH_NESTING);
1583 static inline void double_raw_lock(raw_spinlock_t *l1, raw_spinlock_t *l2)
1589 raw_spin_lock_nested(l2, SINGLE_DEPTH_NESTING);
1593 * double_rq_lock - safely lock two runqueues
1595 * Note this does not disable interrupts like task_rq_lock,
1596 * you need to do so manually before calling.
1598 static inline void double_rq_lock(struct rq *rq1, struct rq *rq2)
1599 __acquires(rq1->lock)
1600 __acquires(rq2->lock)
1602 BUG_ON(!irqs_disabled());
1604 raw_spin_lock(&rq1->lock);
1605 __acquire(rq2->lock); /* Fake it out ;) */
1608 raw_spin_lock(&rq1->lock);
1609 raw_spin_lock_nested(&rq2->lock, SINGLE_DEPTH_NESTING);
1611 raw_spin_lock(&rq2->lock);
1612 raw_spin_lock_nested(&rq1->lock, SINGLE_DEPTH_NESTING);
1618 * double_rq_unlock - safely unlock two runqueues
1620 * Note this does not restore interrupts like task_rq_unlock,
1621 * you need to do so manually after calling.
1623 static inline void double_rq_unlock(struct rq *rq1, struct rq *rq2)
1624 __releases(rq1->lock)
1625 __releases(rq2->lock)
1627 raw_spin_unlock(&rq1->lock);
1629 raw_spin_unlock(&rq2->lock);
1631 __release(rq2->lock);
1634 #else /* CONFIG_SMP */
1637 * double_rq_lock - safely lock two runqueues
1639 * Note this does not disable interrupts like task_rq_lock,
1640 * you need to do so manually before calling.
1642 static inline void double_rq_lock(struct rq *rq1, struct rq *rq2)
1643 __acquires(rq1->lock)
1644 __acquires(rq2->lock)
1646 BUG_ON(!irqs_disabled());
1648 raw_spin_lock(&rq1->lock);
1649 __acquire(rq2->lock); /* Fake it out ;) */
1653 * double_rq_unlock - safely unlock two runqueues
1655 * Note this does not restore interrupts like task_rq_unlock,
1656 * you need to do so manually after calling.
1658 static inline void double_rq_unlock(struct rq *rq1, struct rq *rq2)
1659 __releases(rq1->lock)
1660 __releases(rq2->lock)
1663 raw_spin_unlock(&rq1->lock);
1664 __release(rq2->lock);
1669 extern struct sched_entity *__pick_first_entity(struct cfs_rq *cfs_rq);
1670 extern struct sched_entity *__pick_last_entity(struct cfs_rq *cfs_rq);
1672 #ifdef CONFIG_SCHED_DEBUG
1673 extern void print_cfs_stats(struct seq_file *m, int cpu);
1674 extern void print_rt_stats(struct seq_file *m, int cpu);
1675 extern void print_dl_stats(struct seq_file *m, int cpu);
1677 print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq);
1679 #ifdef CONFIG_NUMA_BALANCING
1681 show_numa_stats(struct task_struct *p, struct seq_file *m);
1683 print_numa_stats(struct seq_file *m, int node, unsigned long tsf,
1684 unsigned long tpf, unsigned long gsf, unsigned long gpf);
1685 #endif /* CONFIG_NUMA_BALANCING */
1686 #endif /* CONFIG_SCHED_DEBUG */
1688 extern void init_cfs_rq(struct cfs_rq *cfs_rq);
1689 extern void init_rt_rq(struct rt_rq *rt_rq);
1690 extern void init_dl_rq(struct dl_rq *dl_rq);
1692 extern void cfs_bandwidth_usage_inc(void);
1693 extern void cfs_bandwidth_usage_dec(void);
1695 #ifdef CONFIG_NO_HZ_COMMON
1696 enum rq_nohz_flag_bits {
1701 #define nohz_flags(cpu) (&cpu_rq(cpu)->nohz_flags)
1703 extern void nohz_balance_exit_idle(unsigned int cpu);
1705 static inline void nohz_balance_exit_idle(unsigned int cpu) { }
1708 #ifdef CONFIG_IRQ_TIME_ACCOUNTING
1710 DECLARE_PER_CPU(u64, cpu_hardirq_time);
1711 DECLARE_PER_CPU(u64, cpu_softirq_time);
1713 #ifndef CONFIG_64BIT
1714 DECLARE_PER_CPU(seqcount_t, irq_time_seq);
1716 static inline void irq_time_write_begin(void)
1718 __this_cpu_inc(irq_time_seq.sequence);
1722 static inline void irq_time_write_end(void)
1725 __this_cpu_inc(irq_time_seq.sequence);
1728 static inline u64 irq_time_read(int cpu)
1734 seq = read_seqcount_begin(&per_cpu(irq_time_seq, cpu));
1735 irq_time = per_cpu(cpu_softirq_time, cpu) +
1736 per_cpu(cpu_hardirq_time, cpu);
1737 } while (read_seqcount_retry(&per_cpu(irq_time_seq, cpu), seq));
1741 #else /* CONFIG_64BIT */
1742 static inline void irq_time_write_begin(void)
1746 static inline void irq_time_write_end(void)
1750 static inline u64 irq_time_read(int cpu)
1752 return per_cpu(cpu_softirq_time, cpu) + per_cpu(cpu_hardirq_time, cpu);
1754 #endif /* CONFIG_64BIT */
1755 #endif /* CONFIG_IRQ_TIME_ACCOUNTING */
1757 #ifdef CONFIG_CPU_FREQ
1758 DECLARE_PER_CPU(struct update_util_data *, cpufreq_update_util_data);
1761 * cpufreq_update_util - Take a note about CPU utilization changes.
1762 * @time: Current time.
1763 * @util: Current utilization.
1764 * @max: Utilization ceiling.
1766 * This function is called by the scheduler on every invocation of
1767 * update_load_avg() on the CPU whose utilization is being updated.
1769 * It can only be called from RCU-sched read-side critical sections.
1771 static inline void cpufreq_update_util(u64 time, unsigned long util, unsigned long max)
1773 struct update_util_data *data;
1775 data = rcu_dereference_sched(*this_cpu_ptr(&cpufreq_update_util_data));
1777 data->func(data, time, util, max);
1781 * cpufreq_trigger_update - Trigger CPU performance state evaluation if needed.
1782 * @time: Current time.
1784 * The way cpufreq is currently arranged requires it to evaluate the CPU
1785 * performance state (frequency/voltage) on a regular basis to prevent it from
1786 * being stuck in a completely inadequate performance level for too long.
1787 * That is not guaranteed to happen if the updates are only triggered from CFS,
1788 * though, because they may not be coming in if RT or deadline tasks are active
1789 * all the time (or there are RT and DL tasks only).
1791 * As a workaround for that issue, this function is called by the RT and DL
1792 * sched classes to trigger extra cpufreq updates to prevent it from stalling,
1793 * but that really is a band-aid. Going forward it should be replaced with
1794 * solutions targeted more specifically at RT and DL tasks.
1796 static inline void cpufreq_trigger_update(u64 time)
1798 cpufreq_update_util(time, ULONG_MAX, 0);
1801 static inline void cpufreq_update_util(u64 time, unsigned long util, unsigned long max) {}
1802 static inline void cpufreq_trigger_update(u64 time) {}
1803 #endif /* CONFIG_CPU_FREQ */
1805 #ifdef arch_scale_freq_capacity
1806 #ifndef arch_scale_freq_invariant
1807 #define arch_scale_freq_invariant() (true)
1809 #else /* arch_scale_freq_capacity */
1810 #define arch_scale_freq_invariant() (false)
1813 static inline void account_reset_rq(struct rq *rq)
1815 #ifdef CONFIG_IRQ_TIME_ACCOUNTING
1816 rq->prev_irq_time = 0;
1818 #ifdef CONFIG_PARAVIRT
1819 rq->prev_steal_time = 0;
1821 #ifdef CONFIG_PARAVIRT_TIME_ACCOUNTING
1822 rq->prev_steal_time_rq = 0;