1391e43daSPeter Zijlstra 2391e43daSPeter Zijlstra #include <linux/sched.h> 3cf4aebc2SClark Williams #include <linux/sched/sysctl.h> 48bd75c77SClark Williams #include <linux/sched/rt.h> 5aab03e05SDario Faggioli #include <linux/sched/deadline.h> 63866e845SSteven Rostedt (Red Hat) #include <linux/binfmts.h> 7391e43daSPeter Zijlstra #include <linux/mutex.h> 8391e43daSPeter Zijlstra #include <linux/spinlock.h> 9391e43daSPeter Zijlstra #include <linux/stop_machine.h> 10b6366f04SSteven Rostedt #include <linux/irq_work.h> 119f3660c2SFrederic Weisbecker #include <linux/tick.h> 12f809ca9aSMel Gorman #include <linux/slab.h> 13391e43daSPeter Zijlstra 14391e43daSPeter Zijlstra #include "cpupri.h" 156bfd6d72SJuri Lelli #include "cpudeadline.h" 1660fed789SLi Zefan #include "cpuacct.h" 17391e43daSPeter Zijlstra 1845ceebf7SPaul Gortmaker struct rq; 19442bf3aaSDaniel Lezcano struct cpuidle_state; 2045ceebf7SPaul Gortmaker 21da0c1e65SKirill Tkhai /* task_struct::on_rq states: */ 22da0c1e65SKirill Tkhai #define TASK_ON_RQ_QUEUED 1 23cca26e80SKirill Tkhai #define TASK_ON_RQ_MIGRATING 2 24da0c1e65SKirill Tkhai 25391e43daSPeter Zijlstra extern __read_mostly int scheduler_running; 26391e43daSPeter Zijlstra 2745ceebf7SPaul Gortmaker extern unsigned long calc_load_update; 2845ceebf7SPaul Gortmaker extern atomic_long_t calc_load_tasks; 2945ceebf7SPaul Gortmaker 303289bdb4SPeter Zijlstra extern void calc_global_load_tick(struct rq *this_rq); 31d60585c5SThomas Gleixner extern long calc_load_fold_active(struct rq *this_rq, long adjust); 323289bdb4SPeter Zijlstra 333289bdb4SPeter Zijlstra #ifdef CONFIG_SMP 34cee1afceSFrederic Weisbecker extern void cpu_load_update_active(struct rq *this_rq); 353289bdb4SPeter Zijlstra #else 36cee1afceSFrederic Weisbecker static inline void cpu_load_update_active(struct rq *this_rq) { } 373289bdb4SPeter Zijlstra #endif 3845ceebf7SPaul Gortmaker 39391e43daSPeter Zijlstra /* 40391e43daSPeter Zijlstra * Helpers for converting nanosecond timing to jiffy resolution 41391e43daSPeter Zijlstra */ 42391e43daSPeter Zijlstra #define NS_TO_JIFFIES(TIME) ((unsigned long)(TIME) / (NSEC_PER_SEC / HZ)) 43391e43daSPeter Zijlstra 44cc1f4b1fSLi Zefan /* 45cc1f4b1fSLi Zefan * Increase resolution of nice-level calculations for 64-bit architectures. 46cc1f4b1fSLi Zefan * The extra resolution improves shares distribution and load balancing of 47cc1f4b1fSLi Zefan * low-weight task groups (eg. nice +19 on an autogroup), deeper taskgroup 48cc1f4b1fSLi Zefan * hierarchies, especially on larger systems. This is not a user-visible change 49cc1f4b1fSLi Zefan * and does not change the user-interface for setting shares/weights. 50cc1f4b1fSLi Zefan * 51cc1f4b1fSLi Zefan * We increase resolution only if we have enough bits to allow this increased 522159197dSPeter Zijlstra * resolution (i.e. 64bit). The costs for increasing resolution when 32bit are 532159197dSPeter Zijlstra * pretty high and the returns do not justify the increased costs. 542159197dSPeter Zijlstra * 552159197dSPeter Zijlstra * Really only required when CONFIG_FAIR_GROUP_SCHED is also set, but to 562159197dSPeter Zijlstra * increase coverage and consistency always enable it on 64bit platforms. 57cc1f4b1fSLi Zefan */ 582159197dSPeter Zijlstra #ifdef CONFIG_64BIT 59172895e6SYuyang Du # define NICE_0_LOAD_SHIFT (SCHED_FIXEDPOINT_SHIFT + SCHED_FIXEDPOINT_SHIFT) 606ecdd749SYuyang Du # define scale_load(w) ((w) << SCHED_FIXEDPOINT_SHIFT) 616ecdd749SYuyang Du # define scale_load_down(w) ((w) >> SCHED_FIXEDPOINT_SHIFT) 62cc1f4b1fSLi Zefan #else 63172895e6SYuyang Du # define NICE_0_LOAD_SHIFT (SCHED_FIXEDPOINT_SHIFT) 64cc1f4b1fSLi Zefan # define scale_load(w) (w) 65cc1f4b1fSLi Zefan # define scale_load_down(w) (w) 66cc1f4b1fSLi Zefan #endif 67cc1f4b1fSLi Zefan 686ecdd749SYuyang Du /* 69172895e6SYuyang Du * Task weight (visible to users) and its load (invisible to users) have 70172895e6SYuyang Du * independent resolution, but they should be well calibrated. We use 71172895e6SYuyang Du * scale_load() and scale_load_down(w) to convert between them. The 72172895e6SYuyang Du * following must be true: 73172895e6SYuyang Du * 74172895e6SYuyang Du * scale_load(sched_prio_to_weight[USER_PRIO(NICE_TO_PRIO(0))]) == NICE_0_LOAD 75172895e6SYuyang Du * 766ecdd749SYuyang Du */ 77172895e6SYuyang Du #define NICE_0_LOAD (1L << NICE_0_LOAD_SHIFT) 78391e43daSPeter Zijlstra 79391e43daSPeter Zijlstra /* 80332ac17eSDario Faggioli * Single value that decides SCHED_DEADLINE internal math precision. 81332ac17eSDario Faggioli * 10 -> just above 1us 82332ac17eSDario Faggioli * 9 -> just above 0.5us 83332ac17eSDario Faggioli */ 84332ac17eSDario Faggioli #define DL_SCALE (10) 85332ac17eSDario Faggioli 86332ac17eSDario Faggioli /* 87391e43daSPeter Zijlstra * These are the 'tuning knobs' of the scheduler: 88391e43daSPeter Zijlstra */ 89391e43daSPeter Zijlstra 90391e43daSPeter Zijlstra /* 91391e43daSPeter Zijlstra * single value that denotes runtime == period, ie unlimited time. 92391e43daSPeter Zijlstra */ 93391e43daSPeter Zijlstra #define RUNTIME_INF ((u64)~0ULL) 94391e43daSPeter Zijlstra 9520f9cd2aSHenrik Austad static inline int idle_policy(int policy) 9620f9cd2aSHenrik Austad { 9720f9cd2aSHenrik Austad return policy == SCHED_IDLE; 9820f9cd2aSHenrik Austad } 99d50dde5aSDario Faggioli static inline int fair_policy(int policy) 100d50dde5aSDario Faggioli { 101d50dde5aSDario Faggioli return policy == SCHED_NORMAL || policy == SCHED_BATCH; 102d50dde5aSDario Faggioli } 103d50dde5aSDario Faggioli 104391e43daSPeter Zijlstra static inline int rt_policy(int policy) 105391e43daSPeter Zijlstra { 106d50dde5aSDario Faggioli return policy == SCHED_FIFO || policy == SCHED_RR; 107391e43daSPeter Zijlstra } 108391e43daSPeter Zijlstra 109aab03e05SDario Faggioli static inline int dl_policy(int policy) 110aab03e05SDario Faggioli { 111aab03e05SDario Faggioli return policy == SCHED_DEADLINE; 112aab03e05SDario Faggioli } 11320f9cd2aSHenrik Austad static inline bool valid_policy(int policy) 11420f9cd2aSHenrik Austad { 11520f9cd2aSHenrik Austad return idle_policy(policy) || fair_policy(policy) || 11620f9cd2aSHenrik Austad rt_policy(policy) || dl_policy(policy); 11720f9cd2aSHenrik Austad } 118aab03e05SDario Faggioli 119391e43daSPeter Zijlstra static inline int task_has_rt_policy(struct task_struct *p) 120391e43daSPeter Zijlstra { 121391e43daSPeter Zijlstra return rt_policy(p->policy); 122391e43daSPeter Zijlstra } 123391e43daSPeter Zijlstra 124aab03e05SDario Faggioli static inline int task_has_dl_policy(struct task_struct *p) 125aab03e05SDario Faggioli { 126aab03e05SDario Faggioli return dl_policy(p->policy); 127aab03e05SDario Faggioli } 128aab03e05SDario Faggioli 1292d3d891dSDario Faggioli /* 1302d3d891dSDario Faggioli * Tells if entity @a should preempt entity @b. 1312d3d891dSDario Faggioli */ 132332ac17eSDario Faggioli static inline bool 133332ac17eSDario Faggioli dl_entity_preempt(struct sched_dl_entity *a, struct sched_dl_entity *b) 1342d3d891dSDario Faggioli { 1352d3d891dSDario Faggioli return dl_time_before(a->deadline, b->deadline); 1362d3d891dSDario Faggioli } 1372d3d891dSDario Faggioli 138391e43daSPeter Zijlstra /* 139391e43daSPeter Zijlstra * This is the priority-queue data structure of the RT scheduling class: 140391e43daSPeter Zijlstra */ 141391e43daSPeter Zijlstra struct rt_prio_array { 142391e43daSPeter Zijlstra DECLARE_BITMAP(bitmap, MAX_RT_PRIO+1); /* include 1 bit for delimiter */ 143391e43daSPeter Zijlstra struct list_head queue[MAX_RT_PRIO]; 144391e43daSPeter Zijlstra }; 145391e43daSPeter Zijlstra 146391e43daSPeter Zijlstra struct rt_bandwidth { 147391e43daSPeter Zijlstra /* nests inside the rq lock: */ 148391e43daSPeter Zijlstra raw_spinlock_t rt_runtime_lock; 149391e43daSPeter Zijlstra ktime_t rt_period; 150391e43daSPeter Zijlstra u64 rt_runtime; 151391e43daSPeter Zijlstra struct hrtimer rt_period_timer; 1524cfafd30SPeter Zijlstra unsigned int rt_period_active; 153391e43daSPeter Zijlstra }; 154a5e7be3bSJuri Lelli 155a5e7be3bSJuri Lelli void __dl_clear_params(struct task_struct *p); 156a5e7be3bSJuri Lelli 157332ac17eSDario Faggioli /* 158332ac17eSDario Faggioli * To keep the bandwidth of -deadline tasks and groups under control 159332ac17eSDario Faggioli * we need some place where: 160332ac17eSDario Faggioli * - store the maximum -deadline bandwidth of the system (the group); 161332ac17eSDario Faggioli * - cache the fraction of that bandwidth that is currently allocated. 162332ac17eSDario Faggioli * 163332ac17eSDario Faggioli * This is all done in the data structure below. It is similar to the 164332ac17eSDario Faggioli * one used for RT-throttling (rt_bandwidth), with the main difference 165332ac17eSDario Faggioli * that, since here we are only interested in admission control, we 166332ac17eSDario Faggioli * do not decrease any runtime while the group "executes", neither we 167332ac17eSDario Faggioli * need a timer to replenish it. 168332ac17eSDario Faggioli * 169332ac17eSDario Faggioli * With respect to SMP, the bandwidth is given on a per-CPU basis, 170332ac17eSDario Faggioli * meaning that: 171332ac17eSDario Faggioli * - dl_bw (< 100%) is the bandwidth of the system (group) on each CPU; 172332ac17eSDario Faggioli * - dl_total_bw array contains, in the i-eth element, the currently 173332ac17eSDario Faggioli * allocated bandwidth on the i-eth CPU. 174332ac17eSDario Faggioli * Moreover, groups consume bandwidth on each CPU, while tasks only 175332ac17eSDario Faggioli * consume bandwidth on the CPU they're running on. 176332ac17eSDario Faggioli * Finally, dl_total_bw_cpu is used to cache the index of dl_total_bw 177332ac17eSDario Faggioli * that will be shown the next time the proc or cgroup controls will 178332ac17eSDario Faggioli * be red. It on its turn can be changed by writing on its own 179332ac17eSDario Faggioli * control. 180332ac17eSDario Faggioli */ 181332ac17eSDario Faggioli struct dl_bandwidth { 182332ac17eSDario Faggioli raw_spinlock_t dl_runtime_lock; 183332ac17eSDario Faggioli u64 dl_runtime; 184332ac17eSDario Faggioli u64 dl_period; 185332ac17eSDario Faggioli }; 186332ac17eSDario Faggioli 187332ac17eSDario Faggioli static inline int dl_bandwidth_enabled(void) 188332ac17eSDario Faggioli { 1891724813dSPeter Zijlstra return sysctl_sched_rt_runtime >= 0; 190332ac17eSDario Faggioli } 191332ac17eSDario Faggioli 192332ac17eSDario Faggioli extern struct dl_bw *dl_bw_of(int i); 193332ac17eSDario Faggioli 194332ac17eSDario Faggioli struct dl_bw { 195332ac17eSDario Faggioli raw_spinlock_t lock; 196332ac17eSDario Faggioli u64 bw, total_bw; 197332ac17eSDario Faggioli }; 198332ac17eSDario Faggioli 1997f51412aSJuri Lelli static inline 2007f51412aSJuri Lelli void __dl_clear(struct dl_bw *dl_b, u64 tsk_bw) 2017f51412aSJuri Lelli { 2027f51412aSJuri Lelli dl_b->total_bw -= tsk_bw; 2037f51412aSJuri Lelli } 2047f51412aSJuri Lelli 2057f51412aSJuri Lelli static inline 2067f51412aSJuri Lelli void __dl_add(struct dl_bw *dl_b, u64 tsk_bw) 2077f51412aSJuri Lelli { 2087f51412aSJuri Lelli dl_b->total_bw += tsk_bw; 2097f51412aSJuri Lelli } 2107f51412aSJuri Lelli 2117f51412aSJuri Lelli static inline 2127f51412aSJuri Lelli bool __dl_overflow(struct dl_bw *dl_b, int cpus, u64 old_bw, u64 new_bw) 2137f51412aSJuri Lelli { 2147f51412aSJuri Lelli return dl_b->bw != -1 && 2157f51412aSJuri Lelli dl_b->bw * cpus < dl_b->total_bw - old_bw + new_bw; 2167f51412aSJuri Lelli } 2177f51412aSJuri Lelli 218391e43daSPeter Zijlstra extern struct mutex sched_domains_mutex; 219391e43daSPeter Zijlstra 220391e43daSPeter Zijlstra #ifdef CONFIG_CGROUP_SCHED 221391e43daSPeter Zijlstra 222391e43daSPeter Zijlstra #include <linux/cgroup.h> 223391e43daSPeter Zijlstra 224391e43daSPeter Zijlstra struct cfs_rq; 225391e43daSPeter Zijlstra struct rt_rq; 226391e43daSPeter Zijlstra 22735cf4e50SMike Galbraith extern struct list_head task_groups; 228391e43daSPeter Zijlstra 229391e43daSPeter Zijlstra struct cfs_bandwidth { 230391e43daSPeter Zijlstra #ifdef CONFIG_CFS_BANDWIDTH 231391e43daSPeter Zijlstra raw_spinlock_t lock; 232391e43daSPeter Zijlstra ktime_t period; 233391e43daSPeter Zijlstra u64 quota, runtime; 2349c58c79aSZhihui Zhang s64 hierarchical_quota; 235391e43daSPeter Zijlstra u64 runtime_expires; 236391e43daSPeter Zijlstra 2374cfafd30SPeter Zijlstra int idle, period_active; 238391e43daSPeter Zijlstra struct hrtimer period_timer, slack_timer; 239391e43daSPeter Zijlstra struct list_head throttled_cfs_rq; 240391e43daSPeter Zijlstra 241391e43daSPeter Zijlstra /* statistics */ 242391e43daSPeter Zijlstra int nr_periods, nr_throttled; 243391e43daSPeter Zijlstra u64 throttled_time; 244391e43daSPeter Zijlstra #endif 245391e43daSPeter Zijlstra }; 246391e43daSPeter Zijlstra 247391e43daSPeter Zijlstra /* task group related information */ 248391e43daSPeter Zijlstra struct task_group { 249391e43daSPeter Zijlstra struct cgroup_subsys_state css; 250391e43daSPeter Zijlstra 251391e43daSPeter Zijlstra #ifdef CONFIG_FAIR_GROUP_SCHED 252391e43daSPeter Zijlstra /* schedulable entities of this group on each cpu */ 253391e43daSPeter Zijlstra struct sched_entity **se; 254391e43daSPeter Zijlstra /* runqueue "owned" by this group on each cpu */ 255391e43daSPeter Zijlstra struct cfs_rq **cfs_rq; 256391e43daSPeter Zijlstra unsigned long shares; 257391e43daSPeter Zijlstra 258fa6bddebSAlex Shi #ifdef CONFIG_SMP 259b0367629SWaiman Long /* 260b0367629SWaiman Long * load_avg can be heavily contended at clock tick time, so put 261b0367629SWaiman Long * it in its own cacheline separated from the fields above which 262b0367629SWaiman Long * will also be accessed at each tick. 263b0367629SWaiman Long */ 264b0367629SWaiman Long atomic_long_t load_avg ____cacheline_aligned; 265391e43daSPeter Zijlstra #endif 266fa6bddebSAlex Shi #endif 267391e43daSPeter Zijlstra 268391e43daSPeter Zijlstra #ifdef CONFIG_RT_GROUP_SCHED 269391e43daSPeter Zijlstra struct sched_rt_entity **rt_se; 270391e43daSPeter Zijlstra struct rt_rq **rt_rq; 271391e43daSPeter Zijlstra 272391e43daSPeter Zijlstra struct rt_bandwidth rt_bandwidth; 273391e43daSPeter Zijlstra #endif 274391e43daSPeter Zijlstra 275391e43daSPeter Zijlstra struct rcu_head rcu; 276391e43daSPeter Zijlstra struct list_head list; 277391e43daSPeter Zijlstra 278391e43daSPeter Zijlstra struct task_group *parent; 279391e43daSPeter Zijlstra struct list_head siblings; 280391e43daSPeter Zijlstra struct list_head children; 281391e43daSPeter Zijlstra 282391e43daSPeter Zijlstra #ifdef CONFIG_SCHED_AUTOGROUP 283391e43daSPeter Zijlstra struct autogroup *autogroup; 284391e43daSPeter Zijlstra #endif 285391e43daSPeter Zijlstra 286391e43daSPeter Zijlstra struct cfs_bandwidth cfs_bandwidth; 287391e43daSPeter Zijlstra }; 288391e43daSPeter Zijlstra 289391e43daSPeter Zijlstra #ifdef CONFIG_FAIR_GROUP_SCHED 290391e43daSPeter Zijlstra #define ROOT_TASK_GROUP_LOAD NICE_0_LOAD 291391e43daSPeter Zijlstra 292391e43daSPeter Zijlstra /* 293391e43daSPeter Zijlstra * A weight of 0 or 1 can cause arithmetics problems. 294391e43daSPeter Zijlstra * A weight of a cfs_rq is the sum of weights of which entities 295391e43daSPeter Zijlstra * are queued on this cfs_rq, so a weight of a entity should not be 296391e43daSPeter Zijlstra * too large, so as the shares value of a task group. 297391e43daSPeter Zijlstra * (The default weight is 1024 - so there's no practical 298391e43daSPeter Zijlstra * limitation from this.) 299391e43daSPeter Zijlstra */ 300391e43daSPeter Zijlstra #define MIN_SHARES (1UL << 1) 301391e43daSPeter Zijlstra #define MAX_SHARES (1UL << 18) 302391e43daSPeter Zijlstra #endif 303391e43daSPeter Zijlstra 304391e43daSPeter Zijlstra typedef int (*tg_visitor)(struct task_group *, void *); 305391e43daSPeter Zijlstra 306391e43daSPeter Zijlstra extern int walk_tg_tree_from(struct task_group *from, 307391e43daSPeter Zijlstra tg_visitor down, tg_visitor up, void *data); 308391e43daSPeter Zijlstra 309391e43daSPeter Zijlstra /* 310391e43daSPeter Zijlstra * Iterate the full tree, calling @down when first entering a node and @up when 311391e43daSPeter Zijlstra * leaving it for the final time. 312391e43daSPeter Zijlstra * 313391e43daSPeter Zijlstra * Caller must hold rcu_lock or sufficient equivalent. 314391e43daSPeter Zijlstra */ 315391e43daSPeter Zijlstra static inline int walk_tg_tree(tg_visitor down, tg_visitor up, void *data) 316391e43daSPeter Zijlstra { 317391e43daSPeter Zijlstra return walk_tg_tree_from(&root_task_group, down, up, data); 318391e43daSPeter Zijlstra } 319391e43daSPeter Zijlstra 320391e43daSPeter Zijlstra extern int tg_nop(struct task_group *tg, void *data); 321391e43daSPeter Zijlstra 322391e43daSPeter Zijlstra extern void free_fair_sched_group(struct task_group *tg); 323391e43daSPeter Zijlstra extern int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent); 3248663e24dSPeter Zijlstra extern void online_fair_sched_group(struct task_group *tg); 3256fe1f348SPeter Zijlstra extern void unregister_fair_sched_group(struct task_group *tg); 326391e43daSPeter Zijlstra extern void init_tg_cfs_entry(struct task_group *tg, struct cfs_rq *cfs_rq, 327391e43daSPeter Zijlstra struct sched_entity *se, int cpu, 328391e43daSPeter Zijlstra struct sched_entity *parent); 329391e43daSPeter Zijlstra extern void init_cfs_bandwidth(struct cfs_bandwidth *cfs_b); 330391e43daSPeter Zijlstra 331391e43daSPeter Zijlstra extern void __refill_cfs_bandwidth_runtime(struct cfs_bandwidth *cfs_b); 33277a4d1a1SPeter Zijlstra extern void start_cfs_bandwidth(struct cfs_bandwidth *cfs_b); 333391e43daSPeter Zijlstra extern void unthrottle_cfs_rq(struct cfs_rq *cfs_rq); 334391e43daSPeter Zijlstra 335391e43daSPeter Zijlstra extern void free_rt_sched_group(struct task_group *tg); 336391e43daSPeter Zijlstra extern int alloc_rt_sched_group(struct task_group *tg, struct task_group *parent); 337391e43daSPeter Zijlstra extern void init_tg_rt_entry(struct task_group *tg, struct rt_rq *rt_rq, 338391e43daSPeter Zijlstra struct sched_rt_entity *rt_se, int cpu, 339391e43daSPeter Zijlstra struct sched_rt_entity *parent); 340391e43daSPeter Zijlstra 34125cc7da7SLi Zefan extern struct task_group *sched_create_group(struct task_group *parent); 34225cc7da7SLi Zefan extern void sched_online_group(struct task_group *tg, 34325cc7da7SLi Zefan struct task_group *parent); 34425cc7da7SLi Zefan extern void sched_destroy_group(struct task_group *tg); 34525cc7da7SLi Zefan extern void sched_offline_group(struct task_group *tg); 34625cc7da7SLi Zefan 34725cc7da7SLi Zefan extern void sched_move_task(struct task_struct *tsk); 34825cc7da7SLi Zefan 34925cc7da7SLi Zefan #ifdef CONFIG_FAIR_GROUP_SCHED 35025cc7da7SLi Zefan extern int sched_group_set_shares(struct task_group *tg, unsigned long shares); 351ad936d86SByungchul Park 352ad936d86SByungchul Park #ifdef CONFIG_SMP 353ad936d86SByungchul Park extern void set_task_rq_fair(struct sched_entity *se, 354ad936d86SByungchul Park struct cfs_rq *prev, struct cfs_rq *next); 355ad936d86SByungchul Park #else /* !CONFIG_SMP */ 356ad936d86SByungchul Park static inline void set_task_rq_fair(struct sched_entity *se, 357ad936d86SByungchul Park struct cfs_rq *prev, struct cfs_rq *next) { } 358ad936d86SByungchul Park #endif /* CONFIG_SMP */ 359ad936d86SByungchul Park #endif /* CONFIG_FAIR_GROUP_SCHED */ 36025cc7da7SLi Zefan 361391e43daSPeter Zijlstra #else /* CONFIG_CGROUP_SCHED */ 362391e43daSPeter Zijlstra 363391e43daSPeter Zijlstra struct cfs_bandwidth { }; 364391e43daSPeter Zijlstra 365391e43daSPeter Zijlstra #endif /* CONFIG_CGROUP_SCHED */ 366391e43daSPeter Zijlstra 367391e43daSPeter Zijlstra /* CFS-related fields in a runqueue */ 368391e43daSPeter Zijlstra struct cfs_rq { 369391e43daSPeter Zijlstra struct load_weight load; 370c82513e5SPeter Zijlstra unsigned int nr_running, h_nr_running; 371391e43daSPeter Zijlstra 372391e43daSPeter Zijlstra u64 exec_clock; 373391e43daSPeter Zijlstra u64 min_vruntime; 374391e43daSPeter Zijlstra #ifndef CONFIG_64BIT 375391e43daSPeter Zijlstra u64 min_vruntime_copy; 376391e43daSPeter Zijlstra #endif 377391e43daSPeter Zijlstra 378391e43daSPeter Zijlstra struct rb_root tasks_timeline; 379391e43daSPeter Zijlstra struct rb_node *rb_leftmost; 380391e43daSPeter Zijlstra 381391e43daSPeter Zijlstra /* 382391e43daSPeter Zijlstra * 'curr' points to currently running entity on this cfs_rq. 383391e43daSPeter Zijlstra * It is set to NULL otherwise (i.e when none are currently running). 384391e43daSPeter Zijlstra */ 385391e43daSPeter Zijlstra struct sched_entity *curr, *next, *last, *skip; 386391e43daSPeter Zijlstra 387391e43daSPeter Zijlstra #ifdef CONFIG_SCHED_DEBUG 388391e43daSPeter Zijlstra unsigned int nr_spread_over; 389391e43daSPeter Zijlstra #endif 390391e43daSPeter Zijlstra 3912dac754eSPaul Turner #ifdef CONFIG_SMP 3922dac754eSPaul Turner /* 3939d89c257SYuyang Du * CFS load tracking 3942dac754eSPaul Turner */ 3959d89c257SYuyang Du struct sched_avg avg; 39613962234SYuyang Du u64 runnable_load_sum; 39713962234SYuyang Du unsigned long runnable_load_avg; 3989d89c257SYuyang Du #ifdef CONFIG_FAIR_GROUP_SCHED 3999d89c257SYuyang Du unsigned long tg_load_avg_contrib; 4009d89c257SYuyang Du #endif 4019d89c257SYuyang Du atomic_long_t removed_load_avg, removed_util_avg; 4029d89c257SYuyang Du #ifndef CONFIG_64BIT 4039d89c257SYuyang Du u64 load_last_update_time_copy; 4049d89c257SYuyang Du #endif 405141965c7SAlex Shi 406c566e8e9SPaul Turner #ifdef CONFIG_FAIR_GROUP_SCHED 40782958366SPaul Turner /* 40882958366SPaul Turner * h_load = weight * f(tg) 40982958366SPaul Turner * 41082958366SPaul Turner * Where f(tg) is the recursive weight fraction assigned to 41182958366SPaul Turner * this group. 41282958366SPaul Turner */ 41382958366SPaul Turner unsigned long h_load; 41468520796SVladimir Davydov u64 last_h_load_update; 41568520796SVladimir Davydov struct sched_entity *h_load_next; 41668520796SVladimir Davydov #endif /* CONFIG_FAIR_GROUP_SCHED */ 41782958366SPaul Turner #endif /* CONFIG_SMP */ 41882958366SPaul Turner 419391e43daSPeter Zijlstra #ifdef CONFIG_FAIR_GROUP_SCHED 420391e43daSPeter Zijlstra struct rq *rq; /* cpu runqueue to which this cfs_rq is attached */ 421391e43daSPeter Zijlstra 422391e43daSPeter Zijlstra /* 423391e43daSPeter Zijlstra * leaf cfs_rqs are those that hold tasks (lowest schedulable entity in 424391e43daSPeter Zijlstra * a hierarchy). Non-leaf lrqs hold other higher schedulable entities 425391e43daSPeter Zijlstra * (like users, containers etc.) 426391e43daSPeter Zijlstra * 427391e43daSPeter Zijlstra * leaf_cfs_rq_list ties together list of leaf cfs_rq's in a cpu. This 428391e43daSPeter Zijlstra * list is used during load balance. 429391e43daSPeter Zijlstra */ 430391e43daSPeter Zijlstra int on_list; 431391e43daSPeter Zijlstra struct list_head leaf_cfs_rq_list; 432391e43daSPeter Zijlstra struct task_group *tg; /* group that "owns" this runqueue */ 433391e43daSPeter Zijlstra 434391e43daSPeter Zijlstra #ifdef CONFIG_CFS_BANDWIDTH 435391e43daSPeter Zijlstra int runtime_enabled; 436391e43daSPeter Zijlstra u64 runtime_expires; 437391e43daSPeter Zijlstra s64 runtime_remaining; 438391e43daSPeter Zijlstra 439f1b17280SPaul Turner u64 throttled_clock, throttled_clock_task; 440f1b17280SPaul Turner u64 throttled_clock_task_time; 44155e16d30SPeter Zijlstra int throttled, throttle_count; 442391e43daSPeter Zijlstra struct list_head throttled_list; 443391e43daSPeter Zijlstra #endif /* CONFIG_CFS_BANDWIDTH */ 444391e43daSPeter Zijlstra #endif /* CONFIG_FAIR_GROUP_SCHED */ 445391e43daSPeter Zijlstra }; 446391e43daSPeter Zijlstra 447391e43daSPeter Zijlstra static inline int rt_bandwidth_enabled(void) 448391e43daSPeter Zijlstra { 449391e43daSPeter Zijlstra return sysctl_sched_rt_runtime >= 0; 450391e43daSPeter Zijlstra } 451391e43daSPeter Zijlstra 452b6366f04SSteven Rostedt /* RT IPI pull logic requires IRQ_WORK */ 453b6366f04SSteven Rostedt #ifdef CONFIG_IRQ_WORK 454b6366f04SSteven Rostedt # define HAVE_RT_PUSH_IPI 455b6366f04SSteven Rostedt #endif 456b6366f04SSteven Rostedt 457391e43daSPeter Zijlstra /* Real-Time classes' related field in a runqueue: */ 458391e43daSPeter Zijlstra struct rt_rq { 459391e43daSPeter Zijlstra struct rt_prio_array active; 460c82513e5SPeter Zijlstra unsigned int rt_nr_running; 46101d36d0aSFrederic Weisbecker unsigned int rr_nr_running; 462391e43daSPeter Zijlstra #if defined CONFIG_SMP || defined CONFIG_RT_GROUP_SCHED 463391e43daSPeter Zijlstra struct { 464391e43daSPeter Zijlstra int curr; /* highest queued rt task prio */ 465391e43daSPeter Zijlstra #ifdef CONFIG_SMP 466391e43daSPeter Zijlstra int next; /* next highest */ 467391e43daSPeter Zijlstra #endif 468391e43daSPeter Zijlstra } highest_prio; 469391e43daSPeter Zijlstra #endif 470391e43daSPeter Zijlstra #ifdef CONFIG_SMP 471391e43daSPeter Zijlstra unsigned long rt_nr_migratory; 472391e43daSPeter Zijlstra unsigned long rt_nr_total; 473391e43daSPeter Zijlstra int overloaded; 474391e43daSPeter Zijlstra struct plist_head pushable_tasks; 475b6366f04SSteven Rostedt #ifdef HAVE_RT_PUSH_IPI 476b6366f04SSteven Rostedt int push_flags; 477b6366f04SSteven Rostedt int push_cpu; 478b6366f04SSteven Rostedt struct irq_work push_work; 479b6366f04SSteven Rostedt raw_spinlock_t push_lock; 480391e43daSPeter Zijlstra #endif 481b6366f04SSteven Rostedt #endif /* CONFIG_SMP */ 482f4ebcbc0SKirill Tkhai int rt_queued; 483f4ebcbc0SKirill Tkhai 484391e43daSPeter Zijlstra int rt_throttled; 485391e43daSPeter Zijlstra u64 rt_time; 486391e43daSPeter Zijlstra u64 rt_runtime; 487391e43daSPeter Zijlstra /* Nests inside the rq lock: */ 488391e43daSPeter Zijlstra raw_spinlock_t rt_runtime_lock; 489391e43daSPeter Zijlstra 490391e43daSPeter Zijlstra #ifdef CONFIG_RT_GROUP_SCHED 491391e43daSPeter Zijlstra unsigned long rt_nr_boosted; 492391e43daSPeter Zijlstra 493391e43daSPeter Zijlstra struct rq *rq; 494391e43daSPeter Zijlstra struct task_group *tg; 495391e43daSPeter Zijlstra #endif 496391e43daSPeter Zijlstra }; 497391e43daSPeter Zijlstra 498aab03e05SDario Faggioli /* Deadline class' related fields in a runqueue */ 499aab03e05SDario Faggioli struct dl_rq { 500aab03e05SDario Faggioli /* runqueue is an rbtree, ordered by deadline */ 501aab03e05SDario Faggioli struct rb_root rb_root; 502aab03e05SDario Faggioli struct rb_node *rb_leftmost; 503aab03e05SDario Faggioli 504aab03e05SDario Faggioli unsigned long dl_nr_running; 5051baca4ceSJuri Lelli 5061baca4ceSJuri Lelli #ifdef CONFIG_SMP 5071baca4ceSJuri Lelli /* 5081baca4ceSJuri Lelli * Deadline values of the currently executing and the 5091baca4ceSJuri Lelli * earliest ready task on this rq. Caching these facilitates 5101baca4ceSJuri Lelli * the decision wether or not a ready but not running task 5111baca4ceSJuri Lelli * should migrate somewhere else. 5121baca4ceSJuri Lelli */ 5131baca4ceSJuri Lelli struct { 5141baca4ceSJuri Lelli u64 curr; 5151baca4ceSJuri Lelli u64 next; 5161baca4ceSJuri Lelli } earliest_dl; 5171baca4ceSJuri Lelli 5181baca4ceSJuri Lelli unsigned long dl_nr_migratory; 5191baca4ceSJuri Lelli int overloaded; 5201baca4ceSJuri Lelli 5211baca4ceSJuri Lelli /* 5221baca4ceSJuri Lelli * Tasks on this rq that can be pushed away. They are kept in 5231baca4ceSJuri Lelli * an rb-tree, ordered by tasks' deadlines, with caching 5241baca4ceSJuri Lelli * of the leftmost (earliest deadline) element. 5251baca4ceSJuri Lelli */ 5261baca4ceSJuri Lelli struct rb_root pushable_dl_tasks_root; 5271baca4ceSJuri Lelli struct rb_node *pushable_dl_tasks_leftmost; 528332ac17eSDario Faggioli #else 529332ac17eSDario Faggioli struct dl_bw dl_bw; 5301baca4ceSJuri Lelli #endif 531aab03e05SDario Faggioli }; 532aab03e05SDario Faggioli 533391e43daSPeter Zijlstra #ifdef CONFIG_SMP 534391e43daSPeter Zijlstra 535391e43daSPeter Zijlstra /* 536391e43daSPeter Zijlstra * We add the notion of a root-domain which will be used to define per-domain 537391e43daSPeter Zijlstra * variables. Each exclusive cpuset essentially defines an island domain by 538391e43daSPeter Zijlstra * fully partitioning the member cpus from any other cpuset. Whenever a new 539391e43daSPeter Zijlstra * exclusive cpuset is created, we also create and attach a new root-domain 540391e43daSPeter Zijlstra * object. 541391e43daSPeter Zijlstra * 542391e43daSPeter Zijlstra */ 543391e43daSPeter Zijlstra struct root_domain { 544391e43daSPeter Zijlstra atomic_t refcount; 545391e43daSPeter Zijlstra atomic_t rto_count; 546391e43daSPeter Zijlstra struct rcu_head rcu; 547391e43daSPeter Zijlstra cpumask_var_t span; 548391e43daSPeter Zijlstra cpumask_var_t online; 549391e43daSPeter Zijlstra 5504486edd1STim Chen /* Indicate more than one runnable task for any CPU */ 5514486edd1STim Chen bool overload; 5524486edd1STim Chen 553391e43daSPeter Zijlstra /* 5541baca4ceSJuri Lelli * The bit corresponding to a CPU gets set here if such CPU has more 5551baca4ceSJuri Lelli * than one runnable -deadline task (as it is below for RT tasks). 5561baca4ceSJuri Lelli */ 5571baca4ceSJuri Lelli cpumask_var_t dlo_mask; 5581baca4ceSJuri Lelli atomic_t dlo_count; 559332ac17eSDario Faggioli struct dl_bw dl_bw; 5606bfd6d72SJuri Lelli struct cpudl cpudl; 5611baca4ceSJuri Lelli 5621baca4ceSJuri Lelli /* 563391e43daSPeter Zijlstra * The "RT overload" flag: it gets set if a CPU has more than 564391e43daSPeter Zijlstra * one runnable RT task. 565391e43daSPeter Zijlstra */ 566391e43daSPeter Zijlstra cpumask_var_t rto_mask; 567391e43daSPeter Zijlstra struct cpupri cpupri; 568391e43daSPeter Zijlstra }; 569391e43daSPeter Zijlstra 570391e43daSPeter Zijlstra extern struct root_domain def_root_domain; 571391e43daSPeter Zijlstra 572391e43daSPeter Zijlstra #endif /* CONFIG_SMP */ 573391e43daSPeter Zijlstra 574391e43daSPeter Zijlstra /* 575391e43daSPeter Zijlstra * This is the main, per-CPU runqueue data structure. 576391e43daSPeter Zijlstra * 577391e43daSPeter Zijlstra * Locking rule: those places that want to lock multiple runqueues 578391e43daSPeter Zijlstra * (such as the load balancing or the thread migration code), lock 579391e43daSPeter Zijlstra * acquire operations must be ordered by ascending &runqueue. 580391e43daSPeter Zijlstra */ 581391e43daSPeter Zijlstra struct rq { 582391e43daSPeter Zijlstra /* runqueue lock: */ 583391e43daSPeter Zijlstra raw_spinlock_t lock; 584391e43daSPeter Zijlstra 585391e43daSPeter Zijlstra /* 586391e43daSPeter Zijlstra * nr_running and cpu_load should be in the same cacheline because 587391e43daSPeter Zijlstra * remote CPUs use both these fields when doing load calculation. 588391e43daSPeter Zijlstra */ 589c82513e5SPeter Zijlstra unsigned int nr_running; 5900ec8aa00SPeter Zijlstra #ifdef CONFIG_NUMA_BALANCING 5910ec8aa00SPeter Zijlstra unsigned int nr_numa_running; 5920ec8aa00SPeter Zijlstra unsigned int nr_preferred_running; 5930ec8aa00SPeter Zijlstra #endif 594391e43daSPeter Zijlstra #define CPU_LOAD_IDX_MAX 5 595391e43daSPeter Zijlstra unsigned long cpu_load[CPU_LOAD_IDX_MAX]; 5963451d024SFrederic Weisbecker #ifdef CONFIG_NO_HZ_COMMON 5979fd81dd5SFrederic Weisbecker #ifdef CONFIG_SMP 5989fd81dd5SFrederic Weisbecker unsigned long last_load_update_tick; 5999fd81dd5SFrederic Weisbecker #endif /* CONFIG_SMP */ 600391e43daSPeter Zijlstra u64 nohz_stamp; 6011c792db7SSuresh Siddha unsigned long nohz_flags; 6029fd81dd5SFrederic Weisbecker #endif /* CONFIG_NO_HZ_COMMON */ 603265f22a9SFrederic Weisbecker #ifdef CONFIG_NO_HZ_FULL 604265f22a9SFrederic Weisbecker unsigned long last_sched_tick; 605265f22a9SFrederic Weisbecker #endif 606391e43daSPeter Zijlstra /* capture load from *all* tasks on this cpu: */ 607391e43daSPeter Zijlstra struct load_weight load; 608391e43daSPeter Zijlstra unsigned long nr_load_updates; 609391e43daSPeter Zijlstra u64 nr_switches; 610391e43daSPeter Zijlstra 611391e43daSPeter Zijlstra struct cfs_rq cfs; 612391e43daSPeter Zijlstra struct rt_rq rt; 613aab03e05SDario Faggioli struct dl_rq dl; 614391e43daSPeter Zijlstra 615391e43daSPeter Zijlstra #ifdef CONFIG_FAIR_GROUP_SCHED 616391e43daSPeter Zijlstra /* list of leaf cfs_rq on this cpu: */ 617391e43daSPeter Zijlstra struct list_head leaf_cfs_rq_list; 618a35b6466SPeter Zijlstra #endif /* CONFIG_FAIR_GROUP_SCHED */ 619a35b6466SPeter Zijlstra 620391e43daSPeter Zijlstra /* 621391e43daSPeter Zijlstra * This is part of a global counter where only the total sum 622391e43daSPeter Zijlstra * over all CPUs matters. A task can increase this counter on 623391e43daSPeter Zijlstra * one CPU and if it got migrated afterwards it may decrease 624391e43daSPeter Zijlstra * it on another CPU. Always updated under the runqueue lock: 625391e43daSPeter Zijlstra */ 626391e43daSPeter Zijlstra unsigned long nr_uninterruptible; 627391e43daSPeter Zijlstra 628391e43daSPeter Zijlstra struct task_struct *curr, *idle, *stop; 629391e43daSPeter Zijlstra unsigned long next_balance; 630391e43daSPeter Zijlstra struct mm_struct *prev_mm; 631391e43daSPeter Zijlstra 6329edfbfedSPeter Zijlstra unsigned int clock_skip_update; 633391e43daSPeter Zijlstra u64 clock; 634391e43daSPeter Zijlstra u64 clock_task; 635391e43daSPeter Zijlstra 636391e43daSPeter Zijlstra atomic_t nr_iowait; 637391e43daSPeter Zijlstra 638391e43daSPeter Zijlstra #ifdef CONFIG_SMP 639391e43daSPeter Zijlstra struct root_domain *rd; 640391e43daSPeter Zijlstra struct sched_domain *sd; 641391e43daSPeter Zijlstra 642ced549faSNicolas Pitre unsigned long cpu_capacity; 643ca6d75e6SVincent Guittot unsigned long cpu_capacity_orig; 644391e43daSPeter Zijlstra 645e3fca9e7SPeter Zijlstra struct callback_head *balance_callback; 646e3fca9e7SPeter Zijlstra 647391e43daSPeter Zijlstra unsigned char idle_balance; 648391e43daSPeter Zijlstra /* For active balancing */ 649391e43daSPeter Zijlstra int active_balance; 650391e43daSPeter Zijlstra int push_cpu; 651391e43daSPeter Zijlstra struct cpu_stop_work active_balance_work; 652391e43daSPeter Zijlstra /* cpu of this runqueue: */ 653391e43daSPeter Zijlstra int cpu; 654391e43daSPeter Zijlstra int online; 655391e43daSPeter Zijlstra 656367456c7SPeter Zijlstra struct list_head cfs_tasks; 657367456c7SPeter Zijlstra 658391e43daSPeter Zijlstra u64 rt_avg; 659391e43daSPeter Zijlstra u64 age_stamp; 660391e43daSPeter Zijlstra u64 idle_stamp; 661391e43daSPeter Zijlstra u64 avg_idle; 6629bd721c5SJason Low 6639bd721c5SJason Low /* This is used to determine avg_idle's max value */ 6649bd721c5SJason Low u64 max_idle_balance_cost; 665391e43daSPeter Zijlstra #endif 666391e43daSPeter Zijlstra 667391e43daSPeter Zijlstra #ifdef CONFIG_IRQ_TIME_ACCOUNTING 668391e43daSPeter Zijlstra u64 prev_irq_time; 669391e43daSPeter Zijlstra #endif 670391e43daSPeter Zijlstra #ifdef CONFIG_PARAVIRT 671391e43daSPeter Zijlstra u64 prev_steal_time; 672391e43daSPeter Zijlstra #endif 673391e43daSPeter Zijlstra #ifdef CONFIG_PARAVIRT_TIME_ACCOUNTING 674391e43daSPeter Zijlstra u64 prev_steal_time_rq; 675391e43daSPeter Zijlstra #endif 676391e43daSPeter Zijlstra 677391e43daSPeter Zijlstra /* calc_load related fields */ 678391e43daSPeter Zijlstra unsigned long calc_load_update; 679391e43daSPeter Zijlstra long calc_load_active; 680391e43daSPeter Zijlstra 681391e43daSPeter Zijlstra #ifdef CONFIG_SCHED_HRTICK 682391e43daSPeter Zijlstra #ifdef CONFIG_SMP 683391e43daSPeter Zijlstra int hrtick_csd_pending; 684391e43daSPeter Zijlstra struct call_single_data hrtick_csd; 685391e43daSPeter Zijlstra #endif 686391e43daSPeter Zijlstra struct hrtimer hrtick_timer; 687391e43daSPeter Zijlstra #endif 688391e43daSPeter Zijlstra 689391e43daSPeter Zijlstra #ifdef CONFIG_SCHEDSTATS 690391e43daSPeter Zijlstra /* latency stats */ 691391e43daSPeter Zijlstra struct sched_info rq_sched_info; 692391e43daSPeter Zijlstra unsigned long long rq_cpu_time; 693391e43daSPeter Zijlstra /* could above be rq->cfs_rq.exec_clock + rq->rt_rq.rt_runtime ? */ 694391e43daSPeter Zijlstra 695391e43daSPeter Zijlstra /* sys_sched_yield() stats */ 696391e43daSPeter Zijlstra unsigned int yld_count; 697391e43daSPeter Zijlstra 698391e43daSPeter Zijlstra /* schedule() stats */ 699391e43daSPeter Zijlstra unsigned int sched_count; 700391e43daSPeter Zijlstra unsigned int sched_goidle; 701391e43daSPeter Zijlstra 702391e43daSPeter Zijlstra /* try_to_wake_up() stats */ 703391e43daSPeter Zijlstra unsigned int ttwu_count; 704391e43daSPeter Zijlstra unsigned int ttwu_local; 705391e43daSPeter Zijlstra #endif 706391e43daSPeter Zijlstra 707391e43daSPeter Zijlstra #ifdef CONFIG_SMP 708391e43daSPeter Zijlstra struct llist_head wake_list; 709391e43daSPeter Zijlstra #endif 710442bf3aaSDaniel Lezcano 711442bf3aaSDaniel Lezcano #ifdef CONFIG_CPU_IDLE 712442bf3aaSDaniel Lezcano /* Must be inspected within a rcu lock section */ 713442bf3aaSDaniel Lezcano struct cpuidle_state *idle_state; 714442bf3aaSDaniel Lezcano #endif 715391e43daSPeter Zijlstra }; 716391e43daSPeter Zijlstra 717391e43daSPeter Zijlstra static inline int cpu_of(struct rq *rq) 718391e43daSPeter Zijlstra { 719391e43daSPeter Zijlstra #ifdef CONFIG_SMP 720391e43daSPeter Zijlstra return rq->cpu; 721391e43daSPeter Zijlstra #else 722391e43daSPeter Zijlstra return 0; 723391e43daSPeter Zijlstra #endif 724391e43daSPeter Zijlstra } 725391e43daSPeter Zijlstra 7268b06c55bSPranith Kumar DECLARE_PER_CPU_SHARED_ALIGNED(struct rq, runqueues); 727391e43daSPeter Zijlstra 728518cd623SPeter Zijlstra #define cpu_rq(cpu) (&per_cpu(runqueues, (cpu))) 7294a32fea9SChristoph Lameter #define this_rq() this_cpu_ptr(&runqueues) 730518cd623SPeter Zijlstra #define task_rq(p) cpu_rq(task_cpu(p)) 731518cd623SPeter Zijlstra #define cpu_curr(cpu) (cpu_rq(cpu)->curr) 7324a32fea9SChristoph Lameter #define raw_rq() raw_cpu_ptr(&runqueues) 733518cd623SPeter Zijlstra 734cebde6d6SPeter Zijlstra static inline u64 __rq_clock_broken(struct rq *rq) 735cebde6d6SPeter Zijlstra { 736316c1608SJason Low return READ_ONCE(rq->clock); 737cebde6d6SPeter Zijlstra } 738cebde6d6SPeter Zijlstra 73978becc27SFrederic Weisbecker static inline u64 rq_clock(struct rq *rq) 74078becc27SFrederic Weisbecker { 741cebde6d6SPeter Zijlstra lockdep_assert_held(&rq->lock); 74278becc27SFrederic Weisbecker return rq->clock; 74378becc27SFrederic Weisbecker } 74478becc27SFrederic Weisbecker 74578becc27SFrederic Weisbecker static inline u64 rq_clock_task(struct rq *rq) 74678becc27SFrederic Weisbecker { 747cebde6d6SPeter Zijlstra lockdep_assert_held(&rq->lock); 74878becc27SFrederic Weisbecker return rq->clock_task; 74978becc27SFrederic Weisbecker } 75078becc27SFrederic Weisbecker 7519edfbfedSPeter Zijlstra #define RQCF_REQ_SKIP 0x01 7529edfbfedSPeter Zijlstra #define RQCF_ACT_SKIP 0x02 7539edfbfedSPeter Zijlstra 7549edfbfedSPeter Zijlstra static inline void rq_clock_skip_update(struct rq *rq, bool skip) 7559edfbfedSPeter Zijlstra { 7569edfbfedSPeter Zijlstra lockdep_assert_held(&rq->lock); 7579edfbfedSPeter Zijlstra if (skip) 7589edfbfedSPeter Zijlstra rq->clock_skip_update |= RQCF_REQ_SKIP; 7599edfbfedSPeter Zijlstra else 7609edfbfedSPeter Zijlstra rq->clock_skip_update &= ~RQCF_REQ_SKIP; 7619edfbfedSPeter Zijlstra } 7629edfbfedSPeter Zijlstra 7639942f79bSRik van Riel #ifdef CONFIG_NUMA 764e3fe70b1SRik van Riel enum numa_topology_type { 765e3fe70b1SRik van Riel NUMA_DIRECT, 766e3fe70b1SRik van Riel NUMA_GLUELESS_MESH, 767e3fe70b1SRik van Riel NUMA_BACKPLANE, 768e3fe70b1SRik van Riel }; 769e3fe70b1SRik van Riel extern enum numa_topology_type sched_numa_topology_type; 7709942f79bSRik van Riel extern int sched_max_numa_distance; 7719942f79bSRik van Riel extern bool find_numa_distance(int distance); 7729942f79bSRik van Riel #endif 7739942f79bSRik van Riel 774f809ca9aSMel Gorman #ifdef CONFIG_NUMA_BALANCING 77544dba3d5SIulia Manda /* The regions in numa_faults array from task_struct */ 77644dba3d5SIulia Manda enum numa_faults_stats { 77744dba3d5SIulia Manda NUMA_MEM = 0, 77844dba3d5SIulia Manda NUMA_CPU, 77944dba3d5SIulia Manda NUMA_MEMBUF, 78044dba3d5SIulia Manda NUMA_CPUBUF 78144dba3d5SIulia Manda }; 7820ec8aa00SPeter Zijlstra extern void sched_setnuma(struct task_struct *p, int node); 783e6628d5bSMel Gorman extern int migrate_task_to(struct task_struct *p, int cpu); 784ac66f547SPeter Zijlstra extern int migrate_swap(struct task_struct *, struct task_struct *); 785f809ca9aSMel Gorman #endif /* CONFIG_NUMA_BALANCING */ 786f809ca9aSMel Gorman 787518cd623SPeter Zijlstra #ifdef CONFIG_SMP 788518cd623SPeter Zijlstra 789e3fca9e7SPeter Zijlstra static inline void 790e3fca9e7SPeter Zijlstra queue_balance_callback(struct rq *rq, 791e3fca9e7SPeter Zijlstra struct callback_head *head, 792e3fca9e7SPeter Zijlstra void (*func)(struct rq *rq)) 793e3fca9e7SPeter Zijlstra { 794e3fca9e7SPeter Zijlstra lockdep_assert_held(&rq->lock); 795e3fca9e7SPeter Zijlstra 796e3fca9e7SPeter Zijlstra if (unlikely(head->next)) 797e3fca9e7SPeter Zijlstra return; 798e3fca9e7SPeter Zijlstra 799e3fca9e7SPeter Zijlstra head->func = (void (*)(struct callback_head *))func; 800e3fca9e7SPeter Zijlstra head->next = rq->balance_callback; 801e3fca9e7SPeter Zijlstra rq->balance_callback = head; 802e3fca9e7SPeter Zijlstra } 803e3fca9e7SPeter Zijlstra 804e3baac47SPeter Zijlstra extern void sched_ttwu_pending(void); 805e3baac47SPeter Zijlstra 806391e43daSPeter Zijlstra #define rcu_dereference_check_sched_domain(p) \ 807391e43daSPeter Zijlstra rcu_dereference_check((p), \ 808391e43daSPeter Zijlstra lockdep_is_held(&sched_domains_mutex)) 809391e43daSPeter Zijlstra 810391e43daSPeter Zijlstra /* 811391e43daSPeter Zijlstra * The domain tree (rq->sd) is protected by RCU's quiescent state transition. 812391e43daSPeter Zijlstra * See detach_destroy_domains: synchronize_sched for details. 813391e43daSPeter Zijlstra * 814391e43daSPeter Zijlstra * The domain tree of any CPU may only be accessed from within 815391e43daSPeter Zijlstra * preempt-disabled sections. 816391e43daSPeter Zijlstra */ 817391e43daSPeter Zijlstra #define for_each_domain(cpu, __sd) \ 818518cd623SPeter Zijlstra for (__sd = rcu_dereference_check_sched_domain(cpu_rq(cpu)->sd); \ 819518cd623SPeter Zijlstra __sd; __sd = __sd->parent) 820391e43daSPeter Zijlstra 82177e81365SSuresh Siddha #define for_each_lower_domain(sd) for (; sd; sd = sd->child) 82277e81365SSuresh Siddha 823518cd623SPeter Zijlstra /** 824518cd623SPeter Zijlstra * highest_flag_domain - Return highest sched_domain containing flag. 825518cd623SPeter Zijlstra * @cpu: The cpu whose highest level of sched domain is to 826518cd623SPeter Zijlstra * be returned. 827518cd623SPeter Zijlstra * @flag: The flag to check for the highest sched_domain 828518cd623SPeter Zijlstra * for the given cpu. 829518cd623SPeter Zijlstra * 830518cd623SPeter Zijlstra * Returns the highest sched_domain of a cpu which contains the given flag. 831518cd623SPeter Zijlstra */ 832518cd623SPeter Zijlstra static inline struct sched_domain *highest_flag_domain(int cpu, int flag) 833518cd623SPeter Zijlstra { 834518cd623SPeter Zijlstra struct sched_domain *sd, *hsd = NULL; 835518cd623SPeter Zijlstra 836518cd623SPeter Zijlstra for_each_domain(cpu, sd) { 837518cd623SPeter Zijlstra if (!(sd->flags & flag)) 838518cd623SPeter Zijlstra break; 839518cd623SPeter Zijlstra hsd = sd; 840518cd623SPeter Zijlstra } 841518cd623SPeter Zijlstra 842518cd623SPeter Zijlstra return hsd; 843518cd623SPeter Zijlstra } 844518cd623SPeter Zijlstra 845fb13c7eeSMel Gorman static inline struct sched_domain *lowest_flag_domain(int cpu, int flag) 846fb13c7eeSMel Gorman { 847fb13c7eeSMel Gorman struct sched_domain *sd; 848fb13c7eeSMel Gorman 849fb13c7eeSMel Gorman for_each_domain(cpu, sd) { 850fb13c7eeSMel Gorman if (sd->flags & flag) 851fb13c7eeSMel Gorman break; 852fb13c7eeSMel Gorman } 853fb13c7eeSMel Gorman 854fb13c7eeSMel Gorman return sd; 855fb13c7eeSMel Gorman } 856fb13c7eeSMel Gorman 857518cd623SPeter Zijlstra DECLARE_PER_CPU(struct sched_domain *, sd_llc); 8587d9ffa89SPeter Zijlstra DECLARE_PER_CPU(int, sd_llc_size); 859518cd623SPeter Zijlstra DECLARE_PER_CPU(int, sd_llc_id); 860fb13c7eeSMel Gorman DECLARE_PER_CPU(struct sched_domain *, sd_numa); 86137dc6b50SPreeti U Murthy DECLARE_PER_CPU(struct sched_domain *, sd_busy); 86237dc6b50SPreeti U Murthy DECLARE_PER_CPU(struct sched_domain *, sd_asym); 863518cd623SPeter Zijlstra 86463b2ca30SNicolas Pitre struct sched_group_capacity { 8655e6521eaSLi Zefan atomic_t ref; 8665e6521eaSLi Zefan /* 867172895e6SYuyang Du * CPU capacity of this group, SCHED_CAPACITY_SCALE being max capacity 86863b2ca30SNicolas Pitre * for a single CPU. 8695e6521eaSLi Zefan */ 870dc7ff76eSVincent Guittot unsigned int capacity; 8715e6521eaSLi Zefan unsigned long next_update; 87263b2ca30SNicolas Pitre int imbalance; /* XXX unrelated to capacity but shared group state */ 8735e6521eaSLi Zefan /* 8745e6521eaSLi Zefan * Number of busy cpus in this group. 8755e6521eaSLi Zefan */ 8765e6521eaSLi Zefan atomic_t nr_busy_cpus; 8775e6521eaSLi Zefan 8785e6521eaSLi Zefan unsigned long cpumask[0]; /* iteration mask */ 8795e6521eaSLi Zefan }; 8805e6521eaSLi Zefan 8815e6521eaSLi Zefan struct sched_group { 8825e6521eaSLi Zefan struct sched_group *next; /* Must be a circular list */ 8835e6521eaSLi Zefan atomic_t ref; 8845e6521eaSLi Zefan 8855e6521eaSLi Zefan unsigned int group_weight; 88663b2ca30SNicolas Pitre struct sched_group_capacity *sgc; 8875e6521eaSLi Zefan 8885e6521eaSLi Zefan /* 8895e6521eaSLi Zefan * The CPUs this group covers. 8905e6521eaSLi Zefan * 8915e6521eaSLi Zefan * NOTE: this field is variable length. (Allocated dynamically 8925e6521eaSLi Zefan * by attaching extra space to the end of the structure, 8935e6521eaSLi Zefan * depending on how many CPUs the kernel has booted up with) 8945e6521eaSLi Zefan */ 8955e6521eaSLi Zefan unsigned long cpumask[0]; 8965e6521eaSLi Zefan }; 8975e6521eaSLi Zefan 8985e6521eaSLi Zefan static inline struct cpumask *sched_group_cpus(struct sched_group *sg) 8995e6521eaSLi Zefan { 9005e6521eaSLi Zefan return to_cpumask(sg->cpumask); 9015e6521eaSLi Zefan } 9025e6521eaSLi Zefan 9035e6521eaSLi Zefan /* 9045e6521eaSLi Zefan * cpumask masking which cpus in the group are allowed to iterate up the domain 9055e6521eaSLi Zefan * tree. 9065e6521eaSLi Zefan */ 9075e6521eaSLi Zefan static inline struct cpumask *sched_group_mask(struct sched_group *sg) 9085e6521eaSLi Zefan { 90963b2ca30SNicolas Pitre return to_cpumask(sg->sgc->cpumask); 9105e6521eaSLi Zefan } 9115e6521eaSLi Zefan 9125e6521eaSLi Zefan /** 9135e6521eaSLi Zefan * group_first_cpu - Returns the first cpu in the cpumask of a sched_group. 9145e6521eaSLi Zefan * @group: The group whose first cpu is to be returned. 9155e6521eaSLi Zefan */ 9165e6521eaSLi Zefan static inline unsigned int group_first_cpu(struct sched_group *group) 9175e6521eaSLi Zefan { 9185e6521eaSLi Zefan return cpumask_first(sched_group_cpus(group)); 9195e6521eaSLi Zefan } 9205e6521eaSLi Zefan 921c1174876SPeter Zijlstra extern int group_balance_cpu(struct sched_group *sg); 922c1174876SPeter Zijlstra 9233866e845SSteven Rostedt (Red Hat) #if defined(CONFIG_SCHED_DEBUG) && defined(CONFIG_SYSCTL) 9243866e845SSteven Rostedt (Red Hat) void register_sched_domain_sysctl(void); 9253866e845SSteven Rostedt (Red Hat) void unregister_sched_domain_sysctl(void); 9263866e845SSteven Rostedt (Red Hat) #else 9273866e845SSteven Rostedt (Red Hat) static inline void register_sched_domain_sysctl(void) 9283866e845SSteven Rostedt (Red Hat) { 9293866e845SSteven Rostedt (Red Hat) } 9303866e845SSteven Rostedt (Red Hat) static inline void unregister_sched_domain_sysctl(void) 9313866e845SSteven Rostedt (Red Hat) { 9323866e845SSteven Rostedt (Red Hat) } 9333866e845SSteven Rostedt (Red Hat) #endif 9343866e845SSteven Rostedt (Red Hat) 935e3baac47SPeter Zijlstra #else 936e3baac47SPeter Zijlstra 937e3baac47SPeter Zijlstra static inline void sched_ttwu_pending(void) { } 938e3baac47SPeter Zijlstra 939518cd623SPeter Zijlstra #endif /* CONFIG_SMP */ 940391e43daSPeter Zijlstra 941391e43daSPeter Zijlstra #include "stats.h" 942391e43daSPeter Zijlstra #include "auto_group.h" 943391e43daSPeter Zijlstra 944391e43daSPeter Zijlstra #ifdef CONFIG_CGROUP_SCHED 945391e43daSPeter Zijlstra 946391e43daSPeter Zijlstra /* 947391e43daSPeter Zijlstra * Return the group to which this tasks belongs. 948391e43daSPeter Zijlstra * 9498af01f56STejun Heo * We cannot use task_css() and friends because the cgroup subsystem 9508af01f56STejun Heo * changes that value before the cgroup_subsys::attach() method is called, 9518af01f56STejun Heo * therefore we cannot pin it and might observe the wrong value. 9528323f26cSPeter Zijlstra * 9538323f26cSPeter Zijlstra * The same is true for autogroup's p->signal->autogroup->tg, the autogroup 9548323f26cSPeter Zijlstra * core changes this before calling sched_move_task(). 9558323f26cSPeter Zijlstra * 9568323f26cSPeter Zijlstra * Instead we use a 'copy' which is updated from sched_move_task() while 9578323f26cSPeter Zijlstra * holding both task_struct::pi_lock and rq::lock. 958391e43daSPeter Zijlstra */ 959391e43daSPeter Zijlstra static inline struct task_group *task_group(struct task_struct *p) 960391e43daSPeter Zijlstra { 9618323f26cSPeter Zijlstra return p->sched_task_group; 962391e43daSPeter Zijlstra } 963391e43daSPeter Zijlstra 964391e43daSPeter Zijlstra /* Change a task's cfs_rq and parent entity if it moves across CPUs/groups */ 965391e43daSPeter Zijlstra static inline void set_task_rq(struct task_struct *p, unsigned int cpu) 966391e43daSPeter Zijlstra { 967391e43daSPeter Zijlstra #if defined(CONFIG_FAIR_GROUP_SCHED) || defined(CONFIG_RT_GROUP_SCHED) 968391e43daSPeter Zijlstra struct task_group *tg = task_group(p); 969391e43daSPeter Zijlstra #endif 970391e43daSPeter Zijlstra 971391e43daSPeter Zijlstra #ifdef CONFIG_FAIR_GROUP_SCHED 972ad936d86SByungchul Park set_task_rq_fair(&p->se, p->se.cfs_rq, tg->cfs_rq[cpu]); 973391e43daSPeter Zijlstra p->se.cfs_rq = tg->cfs_rq[cpu]; 974391e43daSPeter Zijlstra p->se.parent = tg->se[cpu]; 975391e43daSPeter Zijlstra #endif 976391e43daSPeter Zijlstra 977391e43daSPeter Zijlstra #ifdef CONFIG_RT_GROUP_SCHED 978391e43daSPeter Zijlstra p->rt.rt_rq = tg->rt_rq[cpu]; 979391e43daSPeter Zijlstra p->rt.parent = tg->rt_se[cpu]; 980391e43daSPeter Zijlstra #endif 981391e43daSPeter Zijlstra } 982391e43daSPeter Zijlstra 983391e43daSPeter Zijlstra #else /* CONFIG_CGROUP_SCHED */ 984391e43daSPeter Zijlstra 985391e43daSPeter Zijlstra static inline void set_task_rq(struct task_struct *p, unsigned int cpu) { } 986391e43daSPeter Zijlstra static inline struct task_group *task_group(struct task_struct *p) 987391e43daSPeter Zijlstra { 988391e43daSPeter Zijlstra return NULL; 989391e43daSPeter Zijlstra } 990391e43daSPeter Zijlstra 991391e43daSPeter Zijlstra #endif /* CONFIG_CGROUP_SCHED */ 992391e43daSPeter Zijlstra 993391e43daSPeter Zijlstra static inline void __set_task_cpu(struct task_struct *p, unsigned int cpu) 994391e43daSPeter Zijlstra { 995391e43daSPeter Zijlstra set_task_rq(p, cpu); 996391e43daSPeter Zijlstra #ifdef CONFIG_SMP 997391e43daSPeter Zijlstra /* 998391e43daSPeter Zijlstra * After ->cpu is set up to a new value, task_rq_lock(p, ...) can be 999391e43daSPeter Zijlstra * successfuly executed on another CPU. We must ensure that updates of 1000391e43daSPeter Zijlstra * per-task data have been completed by this moment. 1001391e43daSPeter Zijlstra */ 1002391e43daSPeter Zijlstra smp_wmb(); 1003*c65eacbeSAndy Lutomirski #ifdef CONFIG_THREAD_INFO_IN_TASK 1004*c65eacbeSAndy Lutomirski p->cpu = cpu; 1005*c65eacbeSAndy Lutomirski #else 1006391e43daSPeter Zijlstra task_thread_info(p)->cpu = cpu; 1007*c65eacbeSAndy Lutomirski #endif 1008ac66f547SPeter Zijlstra p->wake_cpu = cpu; 1009391e43daSPeter Zijlstra #endif 1010391e43daSPeter Zijlstra } 1011391e43daSPeter Zijlstra 1012391e43daSPeter Zijlstra /* 1013391e43daSPeter Zijlstra * Tunables that become constants when CONFIG_SCHED_DEBUG is off: 1014391e43daSPeter Zijlstra */ 1015391e43daSPeter Zijlstra #ifdef CONFIG_SCHED_DEBUG 1016c5905afbSIngo Molnar # include <linux/static_key.h> 1017391e43daSPeter Zijlstra # define const_debug __read_mostly 1018391e43daSPeter Zijlstra #else 1019391e43daSPeter Zijlstra # define const_debug const 1020391e43daSPeter Zijlstra #endif 1021391e43daSPeter Zijlstra 1022391e43daSPeter Zijlstra extern const_debug unsigned int sysctl_sched_features; 1023391e43daSPeter Zijlstra 1024391e43daSPeter Zijlstra #define SCHED_FEAT(name, enabled) \ 1025391e43daSPeter Zijlstra __SCHED_FEAT_##name , 1026391e43daSPeter Zijlstra 1027391e43daSPeter Zijlstra enum { 1028391e43daSPeter Zijlstra #include "features.h" 1029f8b6d1ccSPeter Zijlstra __SCHED_FEAT_NR, 1030391e43daSPeter Zijlstra }; 1031391e43daSPeter Zijlstra 1032391e43daSPeter Zijlstra #undef SCHED_FEAT 1033391e43daSPeter Zijlstra 1034f8b6d1ccSPeter Zijlstra #if defined(CONFIG_SCHED_DEBUG) && defined(HAVE_JUMP_LABEL) 1035f8b6d1ccSPeter Zijlstra #define SCHED_FEAT(name, enabled) \ 1036c5905afbSIngo Molnar static __always_inline bool static_branch_##name(struct static_key *key) \ 1037f8b6d1ccSPeter Zijlstra { \ 10386e76ea8aSJason Baron return static_key_##enabled(key); \ 1039f8b6d1ccSPeter Zijlstra } 1040f8b6d1ccSPeter Zijlstra 1041f8b6d1ccSPeter Zijlstra #include "features.h" 1042f8b6d1ccSPeter Zijlstra 1043f8b6d1ccSPeter Zijlstra #undef SCHED_FEAT 1044f8b6d1ccSPeter Zijlstra 1045c5905afbSIngo Molnar extern struct static_key sched_feat_keys[__SCHED_FEAT_NR]; 1046f8b6d1ccSPeter Zijlstra #define sched_feat(x) (static_branch_##x(&sched_feat_keys[__SCHED_FEAT_##x])) 1047f8b6d1ccSPeter Zijlstra #else /* !(SCHED_DEBUG && HAVE_JUMP_LABEL) */ 1048391e43daSPeter Zijlstra #define sched_feat(x) (sysctl_sched_features & (1UL << __SCHED_FEAT_##x)) 1049f8b6d1ccSPeter Zijlstra #endif /* SCHED_DEBUG && HAVE_JUMP_LABEL */ 1050391e43daSPeter Zijlstra 10512a595721SSrikar Dronamraju extern struct static_key_false sched_numa_balancing; 1052cb251765SMel Gorman extern struct static_key_false sched_schedstats; 1053cbee9f88SPeter Zijlstra 1054391e43daSPeter Zijlstra static inline u64 global_rt_period(void) 1055391e43daSPeter Zijlstra { 1056391e43daSPeter Zijlstra return (u64)sysctl_sched_rt_period * NSEC_PER_USEC; 1057391e43daSPeter Zijlstra } 1058391e43daSPeter Zijlstra 1059391e43daSPeter Zijlstra static inline u64 global_rt_runtime(void) 1060391e43daSPeter Zijlstra { 1061391e43daSPeter Zijlstra if (sysctl_sched_rt_runtime < 0) 1062391e43daSPeter Zijlstra return RUNTIME_INF; 1063391e43daSPeter Zijlstra 1064391e43daSPeter Zijlstra return (u64)sysctl_sched_rt_runtime * NSEC_PER_USEC; 1065391e43daSPeter Zijlstra } 1066391e43daSPeter Zijlstra 1067391e43daSPeter Zijlstra static inline int task_current(struct rq *rq, struct task_struct *p) 1068391e43daSPeter Zijlstra { 1069391e43daSPeter Zijlstra return rq->curr == p; 1070391e43daSPeter Zijlstra } 1071391e43daSPeter Zijlstra 1072391e43daSPeter Zijlstra static inline int task_running(struct rq *rq, struct task_struct *p) 1073391e43daSPeter Zijlstra { 1074391e43daSPeter Zijlstra #ifdef CONFIG_SMP 1075391e43daSPeter Zijlstra return p->on_cpu; 1076391e43daSPeter Zijlstra #else 1077391e43daSPeter Zijlstra return task_current(rq, p); 1078391e43daSPeter Zijlstra #endif 1079391e43daSPeter Zijlstra } 1080391e43daSPeter Zijlstra 1081da0c1e65SKirill Tkhai static inline int task_on_rq_queued(struct task_struct *p) 1082da0c1e65SKirill Tkhai { 1083da0c1e65SKirill Tkhai return p->on_rq == TASK_ON_RQ_QUEUED; 1084da0c1e65SKirill Tkhai } 1085391e43daSPeter Zijlstra 1086cca26e80SKirill Tkhai static inline int task_on_rq_migrating(struct task_struct *p) 1087cca26e80SKirill Tkhai { 1088cca26e80SKirill Tkhai return p->on_rq == TASK_ON_RQ_MIGRATING; 1089cca26e80SKirill Tkhai } 1090cca26e80SKirill Tkhai 1091391e43daSPeter Zijlstra #ifndef prepare_arch_switch 1092391e43daSPeter Zijlstra # define prepare_arch_switch(next) do { } while (0) 1093391e43daSPeter Zijlstra #endif 109401f23e16SCatalin Marinas #ifndef finish_arch_post_lock_switch 109501f23e16SCatalin Marinas # define finish_arch_post_lock_switch() do { } while (0) 109601f23e16SCatalin Marinas #endif 1097391e43daSPeter Zijlstra 1098391e43daSPeter Zijlstra static inline void prepare_lock_switch(struct rq *rq, struct task_struct *next) 1099391e43daSPeter Zijlstra { 1100391e43daSPeter Zijlstra #ifdef CONFIG_SMP 1101391e43daSPeter Zijlstra /* 1102391e43daSPeter Zijlstra * We can optimise this out completely for !SMP, because the 1103391e43daSPeter Zijlstra * SMP rebalancing from interrupt is the only thing that cares 1104391e43daSPeter Zijlstra * here. 1105391e43daSPeter Zijlstra */ 1106391e43daSPeter Zijlstra next->on_cpu = 1; 1107391e43daSPeter Zijlstra #endif 1108391e43daSPeter Zijlstra } 1109391e43daSPeter Zijlstra 1110391e43daSPeter Zijlstra static inline void finish_lock_switch(struct rq *rq, struct task_struct *prev) 1111391e43daSPeter Zijlstra { 1112391e43daSPeter Zijlstra #ifdef CONFIG_SMP 1113391e43daSPeter Zijlstra /* 1114391e43daSPeter Zijlstra * After ->on_cpu is cleared, the task can be moved to a different CPU. 1115391e43daSPeter Zijlstra * We must ensure this doesn't happen until the switch is completely 1116391e43daSPeter Zijlstra * finished. 111795913d97SPeter Zijlstra * 1118b75a2253SPeter Zijlstra * In particular, the load of prev->state in finish_task_switch() must 1119b75a2253SPeter Zijlstra * happen before this. 1120b75a2253SPeter Zijlstra * 11211f03e8d2SPeter Zijlstra * Pairs with the smp_cond_load_acquire() in try_to_wake_up(). 1122391e43daSPeter Zijlstra */ 112395913d97SPeter Zijlstra smp_store_release(&prev->on_cpu, 0); 1124391e43daSPeter Zijlstra #endif 1125391e43daSPeter Zijlstra #ifdef CONFIG_DEBUG_SPINLOCK 1126391e43daSPeter Zijlstra /* this is a valid case when another task releases the spinlock */ 1127391e43daSPeter Zijlstra rq->lock.owner = current; 1128391e43daSPeter Zijlstra #endif 1129391e43daSPeter Zijlstra /* 1130391e43daSPeter Zijlstra * If we are tracking spinlock dependencies then we have to 1131391e43daSPeter Zijlstra * fix up the runqueue lock - which gets 'carried over' from 1132391e43daSPeter Zijlstra * prev into current: 1133391e43daSPeter Zijlstra */ 1134391e43daSPeter Zijlstra spin_acquire(&rq->lock.dep_map, 0, 0, _THIS_IP_); 1135391e43daSPeter Zijlstra 1136391e43daSPeter Zijlstra raw_spin_unlock_irq(&rq->lock); 1137391e43daSPeter Zijlstra } 1138391e43daSPeter Zijlstra 1139b13095f0SLi Zefan /* 1140b13095f0SLi Zefan * wake flags 1141b13095f0SLi Zefan */ 1142b13095f0SLi Zefan #define WF_SYNC 0x01 /* waker goes to sleep after wakeup */ 1143b13095f0SLi Zefan #define WF_FORK 0x02 /* child wakeup after fork */ 1144b13095f0SLi Zefan #define WF_MIGRATED 0x4 /* internal use, task got migrated */ 1145b13095f0SLi Zefan 1146391e43daSPeter Zijlstra /* 1147391e43daSPeter Zijlstra * To aid in avoiding the subversion of "niceness" due to uneven distribution 1148391e43daSPeter Zijlstra * of tasks with abnormal "nice" values across CPUs the contribution that 1149391e43daSPeter Zijlstra * each task makes to its run queue's load is weighted according to its 1150391e43daSPeter Zijlstra * scheduling class and "nice" value. For SCHED_NORMAL tasks this is just a 1151391e43daSPeter Zijlstra * scaled version of the new time slice allocation that they receive on time 1152391e43daSPeter Zijlstra * slice expiry etc. 1153391e43daSPeter Zijlstra */ 1154391e43daSPeter Zijlstra 1155391e43daSPeter Zijlstra #define WEIGHT_IDLEPRIO 3 1156391e43daSPeter Zijlstra #define WMULT_IDLEPRIO 1431655765 1157391e43daSPeter Zijlstra 1158ed82b8a1SAndi Kleen extern const int sched_prio_to_weight[40]; 1159ed82b8a1SAndi Kleen extern const u32 sched_prio_to_wmult[40]; 1160391e43daSPeter Zijlstra 1161ff77e468SPeter Zijlstra /* 1162ff77e468SPeter Zijlstra * {de,en}queue flags: 1163ff77e468SPeter Zijlstra * 1164ff77e468SPeter Zijlstra * DEQUEUE_SLEEP - task is no longer runnable 1165ff77e468SPeter Zijlstra * ENQUEUE_WAKEUP - task just became runnable 1166ff77e468SPeter Zijlstra * 1167ff77e468SPeter Zijlstra * SAVE/RESTORE - an otherwise spurious dequeue/enqueue, done to ensure tasks 1168ff77e468SPeter Zijlstra * are in a known state which allows modification. Such pairs 1169ff77e468SPeter Zijlstra * should preserve as much state as possible. 1170ff77e468SPeter Zijlstra * 1171ff77e468SPeter Zijlstra * MOVE - paired with SAVE/RESTORE, explicitly does not preserve the location 1172ff77e468SPeter Zijlstra * in the runqueue. 1173ff77e468SPeter Zijlstra * 1174ff77e468SPeter Zijlstra * ENQUEUE_HEAD - place at front of runqueue (tail if not specified) 1175ff77e468SPeter Zijlstra * ENQUEUE_REPLENISH - CBS (replenish runtime and postpone deadline) 117659efa0baSPeter Zijlstra * ENQUEUE_MIGRATED - the task was migrated during wakeup 1177ff77e468SPeter Zijlstra * 1178ff77e468SPeter Zijlstra */ 1179ff77e468SPeter Zijlstra 1180ff77e468SPeter Zijlstra #define DEQUEUE_SLEEP 0x01 1181ff77e468SPeter Zijlstra #define DEQUEUE_SAVE 0x02 /* matches ENQUEUE_RESTORE */ 1182ff77e468SPeter Zijlstra #define DEQUEUE_MOVE 0x04 /* matches ENQUEUE_MOVE */ 1183ff77e468SPeter Zijlstra 11841de64443SPeter Zijlstra #define ENQUEUE_WAKEUP 0x01 1185ff77e468SPeter Zijlstra #define ENQUEUE_RESTORE 0x02 1186ff77e468SPeter Zijlstra #define ENQUEUE_MOVE 0x04 1187ff77e468SPeter Zijlstra 1188ff77e468SPeter Zijlstra #define ENQUEUE_HEAD 0x08 1189ff77e468SPeter Zijlstra #define ENQUEUE_REPLENISH 0x10 1190c82ba9faSLi Zefan #ifdef CONFIG_SMP 119159efa0baSPeter Zijlstra #define ENQUEUE_MIGRATED 0x20 1192c82ba9faSLi Zefan #else 119359efa0baSPeter Zijlstra #define ENQUEUE_MIGRATED 0x00 1194c82ba9faSLi Zefan #endif 1195c82ba9faSLi Zefan 119637e117c0SPeter Zijlstra #define RETRY_TASK ((void *)-1UL) 119737e117c0SPeter Zijlstra 1198c82ba9faSLi Zefan struct sched_class { 1199c82ba9faSLi Zefan const struct sched_class *next; 1200c82ba9faSLi Zefan 1201c82ba9faSLi Zefan void (*enqueue_task) (struct rq *rq, struct task_struct *p, int flags); 1202c82ba9faSLi Zefan void (*dequeue_task) (struct rq *rq, struct task_struct *p, int flags); 1203c82ba9faSLi Zefan void (*yield_task) (struct rq *rq); 1204c82ba9faSLi Zefan bool (*yield_to_task) (struct rq *rq, struct task_struct *p, bool preempt); 1205c82ba9faSLi Zefan 1206c82ba9faSLi Zefan void (*check_preempt_curr) (struct rq *rq, struct task_struct *p, int flags); 1207c82ba9faSLi Zefan 1208606dba2eSPeter Zijlstra /* 1209606dba2eSPeter Zijlstra * It is the responsibility of the pick_next_task() method that will 1210606dba2eSPeter Zijlstra * return the next task to call put_prev_task() on the @prev task or 1211606dba2eSPeter Zijlstra * something equivalent. 121237e117c0SPeter Zijlstra * 121337e117c0SPeter Zijlstra * May return RETRY_TASK when it finds a higher prio class has runnable 121437e117c0SPeter Zijlstra * tasks. 1215606dba2eSPeter Zijlstra */ 1216606dba2eSPeter Zijlstra struct task_struct * (*pick_next_task) (struct rq *rq, 1217e7904a28SPeter Zijlstra struct task_struct *prev, 1218e7904a28SPeter Zijlstra struct pin_cookie cookie); 1219c82ba9faSLi Zefan void (*put_prev_task) (struct rq *rq, struct task_struct *p); 1220c82ba9faSLi Zefan 1221c82ba9faSLi Zefan #ifdef CONFIG_SMP 1222ac66f547SPeter Zijlstra int (*select_task_rq)(struct task_struct *p, int task_cpu, int sd_flag, int flags); 12235a4fd036Sxiaofeng.yan void (*migrate_task_rq)(struct task_struct *p); 1224c82ba9faSLi Zefan 1225c82ba9faSLi Zefan void (*task_woken) (struct rq *this_rq, struct task_struct *task); 1226c82ba9faSLi Zefan 1227c82ba9faSLi Zefan void (*set_cpus_allowed)(struct task_struct *p, 1228c82ba9faSLi Zefan const struct cpumask *newmask); 1229c82ba9faSLi Zefan 1230c82ba9faSLi Zefan void (*rq_online)(struct rq *rq); 1231c82ba9faSLi Zefan void (*rq_offline)(struct rq *rq); 1232c82ba9faSLi Zefan #endif 1233c82ba9faSLi Zefan 1234c82ba9faSLi Zefan void (*set_curr_task) (struct rq *rq); 1235c82ba9faSLi Zefan void (*task_tick) (struct rq *rq, struct task_struct *p, int queued); 1236c82ba9faSLi Zefan void (*task_fork) (struct task_struct *p); 1237e6c390f2SDario Faggioli void (*task_dead) (struct task_struct *p); 1238c82ba9faSLi Zefan 123967dfa1b7SKirill Tkhai /* 124067dfa1b7SKirill Tkhai * The switched_from() call is allowed to drop rq->lock, therefore we 124167dfa1b7SKirill Tkhai * cannot assume the switched_from/switched_to pair is serliazed by 124267dfa1b7SKirill Tkhai * rq->lock. They are however serialized by p->pi_lock. 124367dfa1b7SKirill Tkhai */ 1244c82ba9faSLi Zefan void (*switched_from) (struct rq *this_rq, struct task_struct *task); 1245c82ba9faSLi Zefan void (*switched_to) (struct rq *this_rq, struct task_struct *task); 1246c82ba9faSLi Zefan void (*prio_changed) (struct rq *this_rq, struct task_struct *task, 1247c82ba9faSLi Zefan int oldprio); 1248c82ba9faSLi Zefan 1249c82ba9faSLi Zefan unsigned int (*get_rr_interval) (struct rq *rq, 1250c82ba9faSLi Zefan struct task_struct *task); 1251c82ba9faSLi Zefan 12526e998916SStanislaw Gruszka void (*update_curr) (struct rq *rq); 12536e998916SStanislaw Gruszka 1254ea86cb4bSVincent Guittot #define TASK_SET_GROUP 0 1255ea86cb4bSVincent Guittot #define TASK_MOVE_GROUP 1 1256ea86cb4bSVincent Guittot 1257c82ba9faSLi Zefan #ifdef CONFIG_FAIR_GROUP_SCHED 1258ea86cb4bSVincent Guittot void (*task_change_group) (struct task_struct *p, int type); 1259c82ba9faSLi Zefan #endif 1260c82ba9faSLi Zefan }; 1261391e43daSPeter Zijlstra 12623f1d2a31SPeter Zijlstra static inline void put_prev_task(struct rq *rq, struct task_struct *prev) 12633f1d2a31SPeter Zijlstra { 12643f1d2a31SPeter Zijlstra prev->sched_class->put_prev_task(rq, prev); 12653f1d2a31SPeter Zijlstra } 12663f1d2a31SPeter Zijlstra 1267391e43daSPeter Zijlstra #define sched_class_highest (&stop_sched_class) 1268391e43daSPeter Zijlstra #define for_each_class(class) \ 1269391e43daSPeter Zijlstra for (class = sched_class_highest; class; class = class->next) 1270391e43daSPeter Zijlstra 1271391e43daSPeter Zijlstra extern const struct sched_class stop_sched_class; 1272aab03e05SDario Faggioli extern const struct sched_class dl_sched_class; 1273391e43daSPeter Zijlstra extern const struct sched_class rt_sched_class; 1274391e43daSPeter Zijlstra extern const struct sched_class fair_sched_class; 1275391e43daSPeter Zijlstra extern const struct sched_class idle_sched_class; 1276391e43daSPeter Zijlstra 1277391e43daSPeter Zijlstra 1278391e43daSPeter Zijlstra #ifdef CONFIG_SMP 1279391e43daSPeter Zijlstra 128063b2ca30SNicolas Pitre extern void update_group_capacity(struct sched_domain *sd, int cpu); 1281b719203bSLi Zefan 12827caff66fSDaniel Lezcano extern void trigger_load_balance(struct rq *rq); 1283391e43daSPeter Zijlstra 1284c5b28038SPeter Zijlstra extern void set_cpus_allowed_common(struct task_struct *p, const struct cpumask *new_mask); 1285c5b28038SPeter Zijlstra 1286391e43daSPeter Zijlstra #endif 1287391e43daSPeter Zijlstra 1288442bf3aaSDaniel Lezcano #ifdef CONFIG_CPU_IDLE 1289442bf3aaSDaniel Lezcano static inline void idle_set_state(struct rq *rq, 1290442bf3aaSDaniel Lezcano struct cpuidle_state *idle_state) 1291442bf3aaSDaniel Lezcano { 1292442bf3aaSDaniel Lezcano rq->idle_state = idle_state; 1293442bf3aaSDaniel Lezcano } 1294442bf3aaSDaniel Lezcano 1295442bf3aaSDaniel Lezcano static inline struct cpuidle_state *idle_get_state(struct rq *rq) 1296442bf3aaSDaniel Lezcano { 1297442bf3aaSDaniel Lezcano WARN_ON(!rcu_read_lock_held()); 1298442bf3aaSDaniel Lezcano return rq->idle_state; 1299442bf3aaSDaniel Lezcano } 1300442bf3aaSDaniel Lezcano #else 1301442bf3aaSDaniel Lezcano static inline void idle_set_state(struct rq *rq, 1302442bf3aaSDaniel Lezcano struct cpuidle_state *idle_state) 1303442bf3aaSDaniel Lezcano { 1304442bf3aaSDaniel Lezcano } 1305442bf3aaSDaniel Lezcano 1306442bf3aaSDaniel Lezcano static inline struct cpuidle_state *idle_get_state(struct rq *rq) 1307442bf3aaSDaniel Lezcano { 1308442bf3aaSDaniel Lezcano return NULL; 1309442bf3aaSDaniel Lezcano } 1310442bf3aaSDaniel Lezcano #endif 1311442bf3aaSDaniel Lezcano 1312391e43daSPeter Zijlstra extern void sysrq_sched_debug_show(void); 1313391e43daSPeter Zijlstra extern void sched_init_granularity(void); 1314391e43daSPeter Zijlstra extern void update_max_interval(void); 13151baca4ceSJuri Lelli 13161baca4ceSJuri Lelli extern void init_sched_dl_class(void); 1317391e43daSPeter Zijlstra extern void init_sched_rt_class(void); 1318391e43daSPeter Zijlstra extern void init_sched_fair_class(void); 1319391e43daSPeter Zijlstra 13208875125eSKirill Tkhai extern void resched_curr(struct rq *rq); 1321391e43daSPeter Zijlstra extern void resched_cpu(int cpu); 1322391e43daSPeter Zijlstra 1323391e43daSPeter Zijlstra extern struct rt_bandwidth def_rt_bandwidth; 1324391e43daSPeter Zijlstra extern void init_rt_bandwidth(struct rt_bandwidth *rt_b, u64 period, u64 runtime); 1325391e43daSPeter Zijlstra 1326332ac17eSDario Faggioli extern struct dl_bandwidth def_dl_bandwidth; 1327332ac17eSDario Faggioli extern void init_dl_bandwidth(struct dl_bandwidth *dl_b, u64 period, u64 runtime); 1328aab03e05SDario Faggioli extern void init_dl_task_timer(struct sched_dl_entity *dl_se); 1329aab03e05SDario Faggioli 1330332ac17eSDario Faggioli unsigned long to_ratio(u64 period, u64 runtime); 1331332ac17eSDario Faggioli 1332540247fbSYuyang Du extern void init_entity_runnable_average(struct sched_entity *se); 13332b8c41daSYuyang Du extern void post_init_entity_util_avg(struct sched_entity *se); 1334a75cdaa9SAlex Shi 133576d92ac3SFrederic Weisbecker #ifdef CONFIG_NO_HZ_FULL 133676d92ac3SFrederic Weisbecker extern bool sched_can_stop_tick(struct rq *rq); 133776d92ac3SFrederic Weisbecker 133876d92ac3SFrederic Weisbecker /* 133976d92ac3SFrederic Weisbecker * Tick may be needed by tasks in the runqueue depending on their policy and 134076d92ac3SFrederic Weisbecker * requirements. If tick is needed, lets send the target an IPI to kick it out of 134176d92ac3SFrederic Weisbecker * nohz mode if necessary. 134276d92ac3SFrederic Weisbecker */ 134376d92ac3SFrederic Weisbecker static inline void sched_update_tick_dependency(struct rq *rq) 134476d92ac3SFrederic Weisbecker { 134576d92ac3SFrederic Weisbecker int cpu; 134676d92ac3SFrederic Weisbecker 134776d92ac3SFrederic Weisbecker if (!tick_nohz_full_enabled()) 134876d92ac3SFrederic Weisbecker return; 134976d92ac3SFrederic Weisbecker 135076d92ac3SFrederic Weisbecker cpu = cpu_of(rq); 135176d92ac3SFrederic Weisbecker 135276d92ac3SFrederic Weisbecker if (!tick_nohz_full_cpu(cpu)) 135376d92ac3SFrederic Weisbecker return; 135476d92ac3SFrederic Weisbecker 135576d92ac3SFrederic Weisbecker if (sched_can_stop_tick(rq)) 135676d92ac3SFrederic Weisbecker tick_nohz_dep_clear_cpu(cpu, TICK_DEP_BIT_SCHED); 135776d92ac3SFrederic Weisbecker else 135876d92ac3SFrederic Weisbecker tick_nohz_dep_set_cpu(cpu, TICK_DEP_BIT_SCHED); 135976d92ac3SFrederic Weisbecker } 136076d92ac3SFrederic Weisbecker #else 136176d92ac3SFrederic Weisbecker static inline void sched_update_tick_dependency(struct rq *rq) { } 136276d92ac3SFrederic Weisbecker #endif 136376d92ac3SFrederic Weisbecker 136472465447SKirill Tkhai static inline void add_nr_running(struct rq *rq, unsigned count) 1365391e43daSPeter Zijlstra { 136672465447SKirill Tkhai unsigned prev_nr = rq->nr_running; 136772465447SKirill Tkhai 136872465447SKirill Tkhai rq->nr_running = prev_nr + count; 13699f3660c2SFrederic Weisbecker 137072465447SKirill Tkhai if (prev_nr < 2 && rq->nr_running >= 2) { 13714486edd1STim Chen #ifdef CONFIG_SMP 13724486edd1STim Chen if (!rq->rd->overload) 13734486edd1STim Chen rq->rd->overload = true; 13744486edd1STim Chen #endif 137576d92ac3SFrederic Weisbecker } 13764486edd1STim Chen 137776d92ac3SFrederic Weisbecker sched_update_tick_dependency(rq); 13784486edd1STim Chen } 1379391e43daSPeter Zijlstra 138072465447SKirill Tkhai static inline void sub_nr_running(struct rq *rq, unsigned count) 1381391e43daSPeter Zijlstra { 138272465447SKirill Tkhai rq->nr_running -= count; 138376d92ac3SFrederic Weisbecker /* Check if we still need preemption */ 138476d92ac3SFrederic Weisbecker sched_update_tick_dependency(rq); 1385391e43daSPeter Zijlstra } 1386391e43daSPeter Zijlstra 1387265f22a9SFrederic Weisbecker static inline void rq_last_tick_reset(struct rq *rq) 1388265f22a9SFrederic Weisbecker { 1389265f22a9SFrederic Weisbecker #ifdef CONFIG_NO_HZ_FULL 1390265f22a9SFrederic Weisbecker rq->last_sched_tick = jiffies; 1391265f22a9SFrederic Weisbecker #endif 1392265f22a9SFrederic Weisbecker } 1393265f22a9SFrederic Weisbecker 1394391e43daSPeter Zijlstra extern void update_rq_clock(struct rq *rq); 1395391e43daSPeter Zijlstra 1396391e43daSPeter Zijlstra extern void activate_task(struct rq *rq, struct task_struct *p, int flags); 1397391e43daSPeter Zijlstra extern void deactivate_task(struct rq *rq, struct task_struct *p, int flags); 1398391e43daSPeter Zijlstra 1399391e43daSPeter Zijlstra extern void check_preempt_curr(struct rq *rq, struct task_struct *p, int flags); 1400391e43daSPeter Zijlstra 1401391e43daSPeter Zijlstra extern const_debug unsigned int sysctl_sched_time_avg; 1402391e43daSPeter Zijlstra extern const_debug unsigned int sysctl_sched_nr_migrate; 1403391e43daSPeter Zijlstra extern const_debug unsigned int sysctl_sched_migration_cost; 1404391e43daSPeter Zijlstra 1405391e43daSPeter Zijlstra static inline u64 sched_avg_period(void) 1406391e43daSPeter Zijlstra { 1407391e43daSPeter Zijlstra return (u64)sysctl_sched_time_avg * NSEC_PER_MSEC / 2; 1408391e43daSPeter Zijlstra } 1409391e43daSPeter Zijlstra 1410391e43daSPeter Zijlstra #ifdef CONFIG_SCHED_HRTICK 1411391e43daSPeter Zijlstra 1412391e43daSPeter Zijlstra /* 1413391e43daSPeter Zijlstra * Use hrtick when: 1414391e43daSPeter Zijlstra * - enabled by features 1415391e43daSPeter Zijlstra * - hrtimer is actually high res 1416391e43daSPeter Zijlstra */ 1417391e43daSPeter Zijlstra static inline int hrtick_enabled(struct rq *rq) 1418391e43daSPeter Zijlstra { 1419391e43daSPeter Zijlstra if (!sched_feat(HRTICK)) 1420391e43daSPeter Zijlstra return 0; 1421391e43daSPeter Zijlstra if (!cpu_active(cpu_of(rq))) 1422391e43daSPeter Zijlstra return 0; 1423391e43daSPeter Zijlstra return hrtimer_is_hres_active(&rq->hrtick_timer); 1424391e43daSPeter Zijlstra } 1425391e43daSPeter Zijlstra 1426391e43daSPeter Zijlstra void hrtick_start(struct rq *rq, u64 delay); 1427391e43daSPeter Zijlstra 1428b39e66eaSMike Galbraith #else 1429b39e66eaSMike Galbraith 1430b39e66eaSMike Galbraith static inline int hrtick_enabled(struct rq *rq) 1431b39e66eaSMike Galbraith { 1432b39e66eaSMike Galbraith return 0; 1433b39e66eaSMike Galbraith } 1434b39e66eaSMike Galbraith 1435391e43daSPeter Zijlstra #endif /* CONFIG_SCHED_HRTICK */ 1436391e43daSPeter Zijlstra 1437391e43daSPeter Zijlstra #ifdef CONFIG_SMP 1438391e43daSPeter Zijlstra extern void sched_avg_update(struct rq *rq); 1439dfbca41fSPeter Zijlstra 1440dfbca41fSPeter Zijlstra #ifndef arch_scale_freq_capacity 1441dfbca41fSPeter Zijlstra static __always_inline 1442dfbca41fSPeter Zijlstra unsigned long arch_scale_freq_capacity(struct sched_domain *sd, int cpu) 1443dfbca41fSPeter Zijlstra { 1444dfbca41fSPeter Zijlstra return SCHED_CAPACITY_SCALE; 1445dfbca41fSPeter Zijlstra } 1446dfbca41fSPeter Zijlstra #endif 1447b5b4860dSVincent Guittot 14488cd5601cSMorten Rasmussen #ifndef arch_scale_cpu_capacity 14498cd5601cSMorten Rasmussen static __always_inline 14508cd5601cSMorten Rasmussen unsigned long arch_scale_cpu_capacity(struct sched_domain *sd, int cpu) 14518cd5601cSMorten Rasmussen { 1452e3279a2eSDietmar Eggemann if (sd && (sd->flags & SD_SHARE_CPUCAPACITY) && (sd->span_weight > 1)) 14538cd5601cSMorten Rasmussen return sd->smt_gain / sd->span_weight; 14548cd5601cSMorten Rasmussen 14558cd5601cSMorten Rasmussen return SCHED_CAPACITY_SCALE; 14568cd5601cSMorten Rasmussen } 14578cd5601cSMorten Rasmussen #endif 14588cd5601cSMorten Rasmussen 1459391e43daSPeter Zijlstra static inline void sched_rt_avg_update(struct rq *rq, u64 rt_delta) 1460391e43daSPeter Zijlstra { 1461b5b4860dSVincent Guittot rq->rt_avg += rt_delta * arch_scale_freq_capacity(NULL, cpu_of(rq)); 1462391e43daSPeter Zijlstra sched_avg_update(rq); 1463391e43daSPeter Zijlstra } 1464391e43daSPeter Zijlstra #else 1465391e43daSPeter Zijlstra static inline void sched_rt_avg_update(struct rq *rq, u64 rt_delta) { } 1466391e43daSPeter Zijlstra static inline void sched_avg_update(struct rq *rq) { } 1467391e43daSPeter Zijlstra #endif 1468391e43daSPeter Zijlstra 1469eb580751SPeter Zijlstra struct rq_flags { 1470eb580751SPeter Zijlstra unsigned long flags; 1471e7904a28SPeter Zijlstra struct pin_cookie cookie; 1472eb580751SPeter Zijlstra }; 1473eb580751SPeter Zijlstra 1474eb580751SPeter Zijlstra struct rq *__task_rq_lock(struct task_struct *p, struct rq_flags *rf) 14753e71a462SPeter Zijlstra __acquires(rq->lock); 1476eb580751SPeter Zijlstra struct rq *task_rq_lock(struct task_struct *p, struct rq_flags *rf) 14773960c8c0SPeter Zijlstra __acquires(p->pi_lock) 14783e71a462SPeter Zijlstra __acquires(rq->lock); 14793960c8c0SPeter Zijlstra 1480eb580751SPeter Zijlstra static inline void __task_rq_unlock(struct rq *rq, struct rq_flags *rf) 14813960c8c0SPeter Zijlstra __releases(rq->lock) 14823960c8c0SPeter Zijlstra { 1483e7904a28SPeter Zijlstra lockdep_unpin_lock(&rq->lock, rf->cookie); 14843960c8c0SPeter Zijlstra raw_spin_unlock(&rq->lock); 14853960c8c0SPeter Zijlstra } 14863960c8c0SPeter Zijlstra 14873960c8c0SPeter Zijlstra static inline void 1488eb580751SPeter Zijlstra task_rq_unlock(struct rq *rq, struct task_struct *p, struct rq_flags *rf) 14893960c8c0SPeter Zijlstra __releases(rq->lock) 14903960c8c0SPeter Zijlstra __releases(p->pi_lock) 14913960c8c0SPeter Zijlstra { 1492e7904a28SPeter Zijlstra lockdep_unpin_lock(&rq->lock, rf->cookie); 14933960c8c0SPeter Zijlstra raw_spin_unlock(&rq->lock); 1494eb580751SPeter Zijlstra raw_spin_unlock_irqrestore(&p->pi_lock, rf->flags); 14953960c8c0SPeter Zijlstra } 14963960c8c0SPeter Zijlstra 1497391e43daSPeter Zijlstra #ifdef CONFIG_SMP 1498391e43daSPeter Zijlstra #ifdef CONFIG_PREEMPT 1499391e43daSPeter Zijlstra 1500391e43daSPeter Zijlstra static inline void double_rq_lock(struct rq *rq1, struct rq *rq2); 1501391e43daSPeter Zijlstra 1502391e43daSPeter Zijlstra /* 1503391e43daSPeter Zijlstra * fair double_lock_balance: Safely acquires both rq->locks in a fair 1504391e43daSPeter Zijlstra * way at the expense of forcing extra atomic operations in all 1505391e43daSPeter Zijlstra * invocations. This assures that the double_lock is acquired using the 1506391e43daSPeter Zijlstra * same underlying policy as the spinlock_t on this architecture, which 1507391e43daSPeter Zijlstra * reduces latency compared to the unfair variant below. However, it 1508391e43daSPeter Zijlstra * also adds more overhead and therefore may reduce throughput. 1509391e43daSPeter Zijlstra */ 1510391e43daSPeter Zijlstra static inline int _double_lock_balance(struct rq *this_rq, struct rq *busiest) 1511391e43daSPeter Zijlstra __releases(this_rq->lock) 1512391e43daSPeter Zijlstra __acquires(busiest->lock) 1513391e43daSPeter Zijlstra __acquires(this_rq->lock) 1514391e43daSPeter Zijlstra { 1515391e43daSPeter Zijlstra raw_spin_unlock(&this_rq->lock); 1516391e43daSPeter Zijlstra double_rq_lock(this_rq, busiest); 1517391e43daSPeter Zijlstra 1518391e43daSPeter Zijlstra return 1; 1519391e43daSPeter Zijlstra } 1520391e43daSPeter Zijlstra 1521391e43daSPeter Zijlstra #else 1522391e43daSPeter Zijlstra /* 1523391e43daSPeter Zijlstra * Unfair double_lock_balance: Optimizes throughput at the expense of 1524391e43daSPeter Zijlstra * latency by eliminating extra atomic operations when the locks are 1525391e43daSPeter Zijlstra * already in proper order on entry. This favors lower cpu-ids and will 1526391e43daSPeter Zijlstra * grant the double lock to lower cpus over higher ids under contention, 1527391e43daSPeter Zijlstra * regardless of entry order into the function. 1528391e43daSPeter Zijlstra */ 1529391e43daSPeter Zijlstra static inline int _double_lock_balance(struct rq *this_rq, struct rq *busiest) 1530391e43daSPeter Zijlstra __releases(this_rq->lock) 1531391e43daSPeter Zijlstra __acquires(busiest->lock) 1532391e43daSPeter Zijlstra __acquires(this_rq->lock) 1533391e43daSPeter Zijlstra { 1534391e43daSPeter Zijlstra int ret = 0; 1535391e43daSPeter Zijlstra 1536391e43daSPeter Zijlstra if (unlikely(!raw_spin_trylock(&busiest->lock))) { 1537391e43daSPeter Zijlstra if (busiest < this_rq) { 1538391e43daSPeter Zijlstra raw_spin_unlock(&this_rq->lock); 1539391e43daSPeter Zijlstra raw_spin_lock(&busiest->lock); 1540391e43daSPeter Zijlstra raw_spin_lock_nested(&this_rq->lock, 1541391e43daSPeter Zijlstra SINGLE_DEPTH_NESTING); 1542391e43daSPeter Zijlstra ret = 1; 1543391e43daSPeter Zijlstra } else 1544391e43daSPeter Zijlstra raw_spin_lock_nested(&busiest->lock, 1545391e43daSPeter Zijlstra SINGLE_DEPTH_NESTING); 1546391e43daSPeter Zijlstra } 1547391e43daSPeter Zijlstra return ret; 1548391e43daSPeter Zijlstra } 1549391e43daSPeter Zijlstra 1550391e43daSPeter Zijlstra #endif /* CONFIG_PREEMPT */ 1551391e43daSPeter Zijlstra 1552391e43daSPeter Zijlstra /* 1553391e43daSPeter Zijlstra * double_lock_balance - lock the busiest runqueue, this_rq is locked already. 1554391e43daSPeter Zijlstra */ 1555391e43daSPeter Zijlstra static inline int double_lock_balance(struct rq *this_rq, struct rq *busiest) 1556391e43daSPeter Zijlstra { 1557391e43daSPeter Zijlstra if (unlikely(!irqs_disabled())) { 1558391e43daSPeter Zijlstra /* printk() doesn't work good under rq->lock */ 1559391e43daSPeter Zijlstra raw_spin_unlock(&this_rq->lock); 1560391e43daSPeter Zijlstra BUG_ON(1); 1561391e43daSPeter Zijlstra } 1562391e43daSPeter Zijlstra 1563391e43daSPeter Zijlstra return _double_lock_balance(this_rq, busiest); 1564391e43daSPeter Zijlstra } 1565391e43daSPeter Zijlstra 1566391e43daSPeter Zijlstra static inline void double_unlock_balance(struct rq *this_rq, struct rq *busiest) 1567391e43daSPeter Zijlstra __releases(busiest->lock) 1568391e43daSPeter Zijlstra { 1569391e43daSPeter Zijlstra raw_spin_unlock(&busiest->lock); 1570391e43daSPeter Zijlstra lock_set_subclass(&this_rq->lock.dep_map, 0, _RET_IP_); 1571391e43daSPeter Zijlstra } 1572391e43daSPeter Zijlstra 157374602315SPeter Zijlstra static inline void double_lock(spinlock_t *l1, spinlock_t *l2) 157474602315SPeter Zijlstra { 157574602315SPeter Zijlstra if (l1 > l2) 157674602315SPeter Zijlstra swap(l1, l2); 157774602315SPeter Zijlstra 157874602315SPeter Zijlstra spin_lock(l1); 157974602315SPeter Zijlstra spin_lock_nested(l2, SINGLE_DEPTH_NESTING); 158074602315SPeter Zijlstra } 158174602315SPeter Zijlstra 158260e69eedSMike Galbraith static inline void double_lock_irq(spinlock_t *l1, spinlock_t *l2) 158360e69eedSMike Galbraith { 158460e69eedSMike Galbraith if (l1 > l2) 158560e69eedSMike Galbraith swap(l1, l2); 158660e69eedSMike Galbraith 158760e69eedSMike Galbraith spin_lock_irq(l1); 158860e69eedSMike Galbraith spin_lock_nested(l2, SINGLE_DEPTH_NESTING); 158960e69eedSMike Galbraith } 159060e69eedSMike Galbraith 159174602315SPeter Zijlstra static inline void double_raw_lock(raw_spinlock_t *l1, raw_spinlock_t *l2) 159274602315SPeter Zijlstra { 159374602315SPeter Zijlstra if (l1 > l2) 159474602315SPeter Zijlstra swap(l1, l2); 159574602315SPeter Zijlstra 159674602315SPeter Zijlstra raw_spin_lock(l1); 159774602315SPeter Zijlstra raw_spin_lock_nested(l2, SINGLE_DEPTH_NESTING); 159874602315SPeter Zijlstra } 159974602315SPeter Zijlstra 1600391e43daSPeter Zijlstra /* 1601391e43daSPeter Zijlstra * double_rq_lock - safely lock two runqueues 1602391e43daSPeter Zijlstra * 1603391e43daSPeter Zijlstra * Note this does not disable interrupts like task_rq_lock, 1604391e43daSPeter Zijlstra * you need to do so manually before calling. 1605391e43daSPeter Zijlstra */ 1606391e43daSPeter Zijlstra static inline void double_rq_lock(struct rq *rq1, struct rq *rq2) 1607391e43daSPeter Zijlstra __acquires(rq1->lock) 1608391e43daSPeter Zijlstra __acquires(rq2->lock) 1609391e43daSPeter Zijlstra { 1610391e43daSPeter Zijlstra BUG_ON(!irqs_disabled()); 1611391e43daSPeter Zijlstra if (rq1 == rq2) { 1612391e43daSPeter Zijlstra raw_spin_lock(&rq1->lock); 1613391e43daSPeter Zijlstra __acquire(rq2->lock); /* Fake it out ;) */ 1614391e43daSPeter Zijlstra } else { 1615391e43daSPeter Zijlstra if (rq1 < rq2) { 1616391e43daSPeter Zijlstra raw_spin_lock(&rq1->lock); 1617391e43daSPeter Zijlstra raw_spin_lock_nested(&rq2->lock, SINGLE_DEPTH_NESTING); 1618391e43daSPeter Zijlstra } else { 1619391e43daSPeter Zijlstra raw_spin_lock(&rq2->lock); 1620391e43daSPeter Zijlstra raw_spin_lock_nested(&rq1->lock, SINGLE_DEPTH_NESTING); 1621391e43daSPeter Zijlstra } 1622391e43daSPeter Zijlstra } 1623391e43daSPeter Zijlstra } 1624391e43daSPeter Zijlstra 1625391e43daSPeter Zijlstra /* 1626391e43daSPeter Zijlstra * double_rq_unlock - safely unlock two runqueues 1627391e43daSPeter Zijlstra * 1628391e43daSPeter Zijlstra * Note this does not restore interrupts like task_rq_unlock, 1629391e43daSPeter Zijlstra * you need to do so manually after calling. 1630391e43daSPeter Zijlstra */ 1631391e43daSPeter Zijlstra static inline void double_rq_unlock(struct rq *rq1, struct rq *rq2) 1632391e43daSPeter Zijlstra __releases(rq1->lock) 1633391e43daSPeter Zijlstra __releases(rq2->lock) 1634391e43daSPeter Zijlstra { 1635391e43daSPeter Zijlstra raw_spin_unlock(&rq1->lock); 1636391e43daSPeter Zijlstra if (rq1 != rq2) 1637391e43daSPeter Zijlstra raw_spin_unlock(&rq2->lock); 1638391e43daSPeter Zijlstra else 1639391e43daSPeter Zijlstra __release(rq2->lock); 1640391e43daSPeter Zijlstra } 1641391e43daSPeter Zijlstra 1642391e43daSPeter Zijlstra #else /* CONFIG_SMP */ 1643391e43daSPeter Zijlstra 1644391e43daSPeter Zijlstra /* 1645391e43daSPeter Zijlstra * double_rq_lock - safely lock two runqueues 1646391e43daSPeter Zijlstra * 1647391e43daSPeter Zijlstra * Note this does not disable interrupts like task_rq_lock, 1648391e43daSPeter Zijlstra * you need to do so manually before calling. 1649391e43daSPeter Zijlstra */ 1650391e43daSPeter Zijlstra static inline void double_rq_lock(struct rq *rq1, struct rq *rq2) 1651391e43daSPeter Zijlstra __acquires(rq1->lock) 1652391e43daSPeter Zijlstra __acquires(rq2->lock) 1653391e43daSPeter Zijlstra { 1654391e43daSPeter Zijlstra BUG_ON(!irqs_disabled()); 1655391e43daSPeter Zijlstra BUG_ON(rq1 != rq2); 1656391e43daSPeter Zijlstra raw_spin_lock(&rq1->lock); 1657391e43daSPeter Zijlstra __acquire(rq2->lock); /* Fake it out ;) */ 1658391e43daSPeter Zijlstra } 1659391e43daSPeter Zijlstra 1660391e43daSPeter Zijlstra /* 1661391e43daSPeter Zijlstra * double_rq_unlock - safely unlock two runqueues 1662391e43daSPeter Zijlstra * 1663391e43daSPeter Zijlstra * Note this does not restore interrupts like task_rq_unlock, 1664391e43daSPeter Zijlstra * you need to do so manually after calling. 1665391e43daSPeter Zijlstra */ 1666391e43daSPeter Zijlstra static inline void double_rq_unlock(struct rq *rq1, struct rq *rq2) 1667391e43daSPeter Zijlstra __releases(rq1->lock) 1668391e43daSPeter Zijlstra __releases(rq2->lock) 1669391e43daSPeter Zijlstra { 1670391e43daSPeter Zijlstra BUG_ON(rq1 != rq2); 1671391e43daSPeter Zijlstra raw_spin_unlock(&rq1->lock); 1672391e43daSPeter Zijlstra __release(rq2->lock); 1673391e43daSPeter Zijlstra } 1674391e43daSPeter Zijlstra 1675391e43daSPeter Zijlstra #endif 1676391e43daSPeter Zijlstra 1677391e43daSPeter Zijlstra extern struct sched_entity *__pick_first_entity(struct cfs_rq *cfs_rq); 1678391e43daSPeter Zijlstra extern struct sched_entity *__pick_last_entity(struct cfs_rq *cfs_rq); 16796b55c965SSrikar Dronamraju 16806b55c965SSrikar Dronamraju #ifdef CONFIG_SCHED_DEBUG 1681391e43daSPeter Zijlstra extern void print_cfs_stats(struct seq_file *m, int cpu); 1682391e43daSPeter Zijlstra extern void print_rt_stats(struct seq_file *m, int cpu); 1683acb32132SWanpeng Li extern void print_dl_stats(struct seq_file *m, int cpu); 16846b55c965SSrikar Dronamraju extern void 16856b55c965SSrikar Dronamraju print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq); 1686397f2378SSrikar Dronamraju 1687397f2378SSrikar Dronamraju #ifdef CONFIG_NUMA_BALANCING 1688397f2378SSrikar Dronamraju extern void 1689397f2378SSrikar Dronamraju show_numa_stats(struct task_struct *p, struct seq_file *m); 1690397f2378SSrikar Dronamraju extern void 1691397f2378SSrikar Dronamraju print_numa_stats(struct seq_file *m, int node, unsigned long tsf, 1692397f2378SSrikar Dronamraju unsigned long tpf, unsigned long gsf, unsigned long gpf); 1693397f2378SSrikar Dronamraju #endif /* CONFIG_NUMA_BALANCING */ 1694397f2378SSrikar Dronamraju #endif /* CONFIG_SCHED_DEBUG */ 1695391e43daSPeter Zijlstra 1696391e43daSPeter Zijlstra extern void init_cfs_rq(struct cfs_rq *cfs_rq); 169707c54f7aSAbel Vesa extern void init_rt_rq(struct rt_rq *rt_rq); 169807c54f7aSAbel Vesa extern void init_dl_rq(struct dl_rq *dl_rq); 1699391e43daSPeter Zijlstra 17001ee14e6cSBen Segall extern void cfs_bandwidth_usage_inc(void); 17011ee14e6cSBen Segall extern void cfs_bandwidth_usage_dec(void); 17021c792db7SSuresh Siddha 17033451d024SFrederic Weisbecker #ifdef CONFIG_NO_HZ_COMMON 17041c792db7SSuresh Siddha enum rq_nohz_flag_bits { 17051c792db7SSuresh Siddha NOHZ_TICK_STOPPED, 17061c792db7SSuresh Siddha NOHZ_BALANCE_KICK, 17071c792db7SSuresh Siddha }; 17081c792db7SSuresh Siddha 17091c792db7SSuresh Siddha #define nohz_flags(cpu) (&cpu_rq(cpu)->nohz_flags) 171020a5c8ccSThomas Gleixner 171120a5c8ccSThomas Gleixner extern void nohz_balance_exit_idle(unsigned int cpu); 171220a5c8ccSThomas Gleixner #else 171320a5c8ccSThomas Gleixner static inline void nohz_balance_exit_idle(unsigned int cpu) { } 17141c792db7SSuresh Siddha #endif 171573fbec60SFrederic Weisbecker 171673fbec60SFrederic Weisbecker #ifdef CONFIG_IRQ_TIME_ACCOUNTING 171773fbec60SFrederic Weisbecker 171873fbec60SFrederic Weisbecker DECLARE_PER_CPU(u64, cpu_hardirq_time); 171973fbec60SFrederic Weisbecker DECLARE_PER_CPU(u64, cpu_softirq_time); 172073fbec60SFrederic Weisbecker 172173fbec60SFrederic Weisbecker #ifndef CONFIG_64BIT 172273fbec60SFrederic Weisbecker DECLARE_PER_CPU(seqcount_t, irq_time_seq); 172373fbec60SFrederic Weisbecker 172473fbec60SFrederic Weisbecker static inline void irq_time_write_begin(void) 172573fbec60SFrederic Weisbecker { 172673fbec60SFrederic Weisbecker __this_cpu_inc(irq_time_seq.sequence); 172773fbec60SFrederic Weisbecker smp_wmb(); 172873fbec60SFrederic Weisbecker } 172973fbec60SFrederic Weisbecker 173073fbec60SFrederic Weisbecker static inline void irq_time_write_end(void) 173173fbec60SFrederic Weisbecker { 173273fbec60SFrederic Weisbecker smp_wmb(); 173373fbec60SFrederic Weisbecker __this_cpu_inc(irq_time_seq.sequence); 173473fbec60SFrederic Weisbecker } 173573fbec60SFrederic Weisbecker 173673fbec60SFrederic Weisbecker static inline u64 irq_time_read(int cpu) 173773fbec60SFrederic Weisbecker { 173873fbec60SFrederic Weisbecker u64 irq_time; 173973fbec60SFrederic Weisbecker unsigned seq; 174073fbec60SFrederic Weisbecker 174173fbec60SFrederic Weisbecker do { 174273fbec60SFrederic Weisbecker seq = read_seqcount_begin(&per_cpu(irq_time_seq, cpu)); 174373fbec60SFrederic Weisbecker irq_time = per_cpu(cpu_softirq_time, cpu) + 174473fbec60SFrederic Weisbecker per_cpu(cpu_hardirq_time, cpu); 174573fbec60SFrederic Weisbecker } while (read_seqcount_retry(&per_cpu(irq_time_seq, cpu), seq)); 174673fbec60SFrederic Weisbecker 174773fbec60SFrederic Weisbecker return irq_time; 174873fbec60SFrederic Weisbecker } 174973fbec60SFrederic Weisbecker #else /* CONFIG_64BIT */ 175073fbec60SFrederic Weisbecker static inline void irq_time_write_begin(void) 175173fbec60SFrederic Weisbecker { 175273fbec60SFrederic Weisbecker } 175373fbec60SFrederic Weisbecker 175473fbec60SFrederic Weisbecker static inline void irq_time_write_end(void) 175573fbec60SFrederic Weisbecker { 175673fbec60SFrederic Weisbecker } 175773fbec60SFrederic Weisbecker 175873fbec60SFrederic Weisbecker static inline u64 irq_time_read(int cpu) 175973fbec60SFrederic Weisbecker { 176073fbec60SFrederic Weisbecker return per_cpu(cpu_softirq_time, cpu) + per_cpu(cpu_hardirq_time, cpu); 176173fbec60SFrederic Weisbecker } 176273fbec60SFrederic Weisbecker #endif /* CONFIG_64BIT */ 176373fbec60SFrederic Weisbecker #endif /* CONFIG_IRQ_TIME_ACCOUNTING */ 1764adaf9fcdSRafael J. Wysocki 1765adaf9fcdSRafael J. Wysocki #ifdef CONFIG_CPU_FREQ 1766adaf9fcdSRafael J. Wysocki DECLARE_PER_CPU(struct update_util_data *, cpufreq_update_util_data); 1767adaf9fcdSRafael J. Wysocki 1768adaf9fcdSRafael J. Wysocki /** 1769adaf9fcdSRafael J. Wysocki * cpufreq_update_util - Take a note about CPU utilization changes. 1770adaf9fcdSRafael J. Wysocki * @time: Current time. 1771adaf9fcdSRafael J. Wysocki * @util: Current utilization. 1772adaf9fcdSRafael J. Wysocki * @max: Utilization ceiling. 1773adaf9fcdSRafael J. Wysocki * 1774adaf9fcdSRafael J. Wysocki * This function is called by the scheduler on every invocation of 1775adaf9fcdSRafael J. Wysocki * update_load_avg() on the CPU whose utilization is being updated. 1776adaf9fcdSRafael J. Wysocki * 1777adaf9fcdSRafael J. Wysocki * It can only be called from RCU-sched read-side critical sections. 1778adaf9fcdSRafael J. Wysocki */ 1779adaf9fcdSRafael J. Wysocki static inline void cpufreq_update_util(u64 time, unsigned long util, unsigned long max) 1780adaf9fcdSRafael J. Wysocki { 1781adaf9fcdSRafael J. Wysocki struct update_util_data *data; 1782adaf9fcdSRafael J. Wysocki 1783adaf9fcdSRafael J. Wysocki data = rcu_dereference_sched(*this_cpu_ptr(&cpufreq_update_util_data)); 1784adaf9fcdSRafael J. Wysocki if (data) 1785adaf9fcdSRafael J. Wysocki data->func(data, time, util, max); 1786adaf9fcdSRafael J. Wysocki } 1787adaf9fcdSRafael J. Wysocki 1788adaf9fcdSRafael J. Wysocki /** 1789adaf9fcdSRafael J. Wysocki * cpufreq_trigger_update - Trigger CPU performance state evaluation if needed. 1790adaf9fcdSRafael J. Wysocki * @time: Current time. 1791adaf9fcdSRafael J. Wysocki * 1792adaf9fcdSRafael J. Wysocki * The way cpufreq is currently arranged requires it to evaluate the CPU 1793adaf9fcdSRafael J. Wysocki * performance state (frequency/voltage) on a regular basis to prevent it from 1794adaf9fcdSRafael J. Wysocki * being stuck in a completely inadequate performance level for too long. 1795adaf9fcdSRafael J. Wysocki * That is not guaranteed to happen if the updates are only triggered from CFS, 1796adaf9fcdSRafael J. Wysocki * though, because they may not be coming in if RT or deadline tasks are active 1797adaf9fcdSRafael J. Wysocki * all the time (or there are RT and DL tasks only). 1798adaf9fcdSRafael J. Wysocki * 1799adaf9fcdSRafael J. Wysocki * As a workaround for that issue, this function is called by the RT and DL 1800adaf9fcdSRafael J. Wysocki * sched classes to trigger extra cpufreq updates to prevent it from stalling, 1801adaf9fcdSRafael J. Wysocki * but that really is a band-aid. Going forward it should be replaced with 1802adaf9fcdSRafael J. Wysocki * solutions targeted more specifically at RT and DL tasks. 1803adaf9fcdSRafael J. Wysocki */ 1804adaf9fcdSRafael J. Wysocki static inline void cpufreq_trigger_update(u64 time) 1805adaf9fcdSRafael J. Wysocki { 1806adaf9fcdSRafael J. Wysocki cpufreq_update_util(time, ULONG_MAX, 0); 1807adaf9fcdSRafael J. Wysocki } 1808adaf9fcdSRafael J. Wysocki #else 1809adaf9fcdSRafael J. Wysocki static inline void cpufreq_update_util(u64 time, unsigned long util, unsigned long max) {} 1810adaf9fcdSRafael J. Wysocki static inline void cpufreq_trigger_update(u64 time) {} 1811adaf9fcdSRafael J. Wysocki #endif /* CONFIG_CPU_FREQ */ 1812be53f58fSLinus Torvalds 18139bdcb44eSRafael J. Wysocki #ifdef arch_scale_freq_capacity 18149bdcb44eSRafael J. Wysocki #ifndef arch_scale_freq_invariant 18159bdcb44eSRafael J. Wysocki #define arch_scale_freq_invariant() (true) 18169bdcb44eSRafael J. Wysocki #endif 18179bdcb44eSRafael J. Wysocki #else /* arch_scale_freq_capacity */ 18189bdcb44eSRafael J. Wysocki #define arch_scale_freq_invariant() (false) 18199bdcb44eSRafael J. Wysocki #endif 1820