1391e43daSPeter Zijlstra 2391e43daSPeter Zijlstra #include <linux/sched.h> 3391e43daSPeter Zijlstra #include <linux/mutex.h> 4391e43daSPeter Zijlstra #include <linux/spinlock.h> 5391e43daSPeter Zijlstra #include <linux/stop_machine.h> 6391e43daSPeter Zijlstra 7391e43daSPeter Zijlstra #include "cpupri.h" 8391e43daSPeter Zijlstra 9391e43daSPeter Zijlstra extern __read_mostly int scheduler_running; 10391e43daSPeter Zijlstra 11391e43daSPeter Zijlstra /* 12391e43daSPeter Zijlstra * Convert user-nice values [ -20 ... 0 ... 19 ] 13391e43daSPeter Zijlstra * to static priority [ MAX_RT_PRIO..MAX_PRIO-1 ], 14391e43daSPeter Zijlstra * and back. 15391e43daSPeter Zijlstra */ 16391e43daSPeter Zijlstra #define NICE_TO_PRIO(nice) (MAX_RT_PRIO + (nice) + 20) 17391e43daSPeter Zijlstra #define PRIO_TO_NICE(prio) ((prio) - MAX_RT_PRIO - 20) 18391e43daSPeter Zijlstra #define TASK_NICE(p) PRIO_TO_NICE((p)->static_prio) 19391e43daSPeter Zijlstra 20391e43daSPeter Zijlstra /* 21391e43daSPeter Zijlstra * 'User priority' is the nice value converted to something we 22391e43daSPeter Zijlstra * can work with better when scaling various scheduler parameters, 23391e43daSPeter Zijlstra * it's a [ 0 ... 39 ] range. 24391e43daSPeter Zijlstra */ 25391e43daSPeter Zijlstra #define USER_PRIO(p) ((p)-MAX_RT_PRIO) 26391e43daSPeter Zijlstra #define TASK_USER_PRIO(p) USER_PRIO((p)->static_prio) 27391e43daSPeter Zijlstra #define MAX_USER_PRIO (USER_PRIO(MAX_PRIO)) 28391e43daSPeter Zijlstra 29391e43daSPeter Zijlstra /* 30391e43daSPeter Zijlstra * Helpers for converting nanosecond timing to jiffy resolution 31391e43daSPeter Zijlstra */ 32391e43daSPeter Zijlstra #define NS_TO_JIFFIES(TIME) ((unsigned long)(TIME) / (NSEC_PER_SEC / HZ)) 33391e43daSPeter Zijlstra 34391e43daSPeter Zijlstra #define NICE_0_LOAD SCHED_LOAD_SCALE 35391e43daSPeter Zijlstra #define NICE_0_SHIFT SCHED_LOAD_SHIFT 36391e43daSPeter Zijlstra 37391e43daSPeter Zijlstra /* 38391e43daSPeter Zijlstra * These are the 'tuning knobs' of the scheduler: 39391e43daSPeter Zijlstra */ 40391e43daSPeter Zijlstra 41391e43daSPeter Zijlstra /* 42391e43daSPeter Zijlstra * single value that denotes runtime == period, ie unlimited time. 43391e43daSPeter Zijlstra */ 44391e43daSPeter Zijlstra #define RUNTIME_INF ((u64)~0ULL) 45391e43daSPeter Zijlstra 46391e43daSPeter Zijlstra static inline int rt_policy(int policy) 47391e43daSPeter Zijlstra { 48391e43daSPeter Zijlstra if (policy == SCHED_FIFO || policy == SCHED_RR) 49391e43daSPeter Zijlstra return 1; 50391e43daSPeter Zijlstra return 0; 51391e43daSPeter Zijlstra } 52391e43daSPeter Zijlstra 53391e43daSPeter Zijlstra static inline int task_has_rt_policy(struct task_struct *p) 54391e43daSPeter Zijlstra { 55391e43daSPeter Zijlstra return rt_policy(p->policy); 56391e43daSPeter Zijlstra } 57391e43daSPeter Zijlstra 58391e43daSPeter Zijlstra /* 59391e43daSPeter Zijlstra * This is the priority-queue data structure of the RT scheduling class: 60391e43daSPeter Zijlstra */ 61391e43daSPeter Zijlstra struct rt_prio_array { 62391e43daSPeter Zijlstra DECLARE_BITMAP(bitmap, MAX_RT_PRIO+1); /* include 1 bit for delimiter */ 63391e43daSPeter Zijlstra struct list_head queue[MAX_RT_PRIO]; 64391e43daSPeter Zijlstra }; 65391e43daSPeter Zijlstra 66391e43daSPeter Zijlstra struct rt_bandwidth { 67391e43daSPeter Zijlstra /* nests inside the rq lock: */ 68391e43daSPeter Zijlstra raw_spinlock_t rt_runtime_lock; 69391e43daSPeter Zijlstra ktime_t rt_period; 70391e43daSPeter Zijlstra u64 rt_runtime; 71391e43daSPeter Zijlstra struct hrtimer rt_period_timer; 72391e43daSPeter Zijlstra }; 73391e43daSPeter Zijlstra 74391e43daSPeter Zijlstra extern struct mutex sched_domains_mutex; 75391e43daSPeter Zijlstra 76391e43daSPeter Zijlstra #ifdef CONFIG_CGROUP_SCHED 77391e43daSPeter Zijlstra 78391e43daSPeter Zijlstra #include <linux/cgroup.h> 79391e43daSPeter Zijlstra 80391e43daSPeter Zijlstra struct cfs_rq; 81391e43daSPeter Zijlstra struct rt_rq; 82391e43daSPeter Zijlstra 8335cf4e50SMike Galbraith extern struct list_head task_groups; 84391e43daSPeter Zijlstra 85391e43daSPeter Zijlstra struct cfs_bandwidth { 86391e43daSPeter Zijlstra #ifdef CONFIG_CFS_BANDWIDTH 87391e43daSPeter Zijlstra raw_spinlock_t lock; 88391e43daSPeter Zijlstra ktime_t period; 89391e43daSPeter Zijlstra u64 quota, runtime; 90391e43daSPeter Zijlstra s64 hierarchal_quota; 91391e43daSPeter Zijlstra u64 runtime_expires; 92391e43daSPeter Zijlstra 93391e43daSPeter Zijlstra int idle, timer_active; 94391e43daSPeter Zijlstra struct hrtimer period_timer, slack_timer; 95391e43daSPeter Zijlstra struct list_head throttled_cfs_rq; 96391e43daSPeter Zijlstra 97391e43daSPeter Zijlstra /* statistics */ 98391e43daSPeter Zijlstra int nr_periods, nr_throttled; 99391e43daSPeter Zijlstra u64 throttled_time; 100391e43daSPeter Zijlstra #endif 101391e43daSPeter Zijlstra }; 102391e43daSPeter Zijlstra 103391e43daSPeter Zijlstra /* task group related information */ 104391e43daSPeter Zijlstra struct task_group { 105391e43daSPeter Zijlstra struct cgroup_subsys_state css; 106391e43daSPeter Zijlstra 107391e43daSPeter Zijlstra #ifdef CONFIG_FAIR_GROUP_SCHED 108391e43daSPeter Zijlstra /* schedulable entities of this group on each cpu */ 109391e43daSPeter Zijlstra struct sched_entity **se; 110391e43daSPeter Zijlstra /* runqueue "owned" by this group on each cpu */ 111391e43daSPeter Zijlstra struct cfs_rq **cfs_rq; 112391e43daSPeter Zijlstra unsigned long shares; 113391e43daSPeter Zijlstra 114391e43daSPeter Zijlstra atomic_t load_weight; 115391e43daSPeter Zijlstra #endif 116391e43daSPeter Zijlstra 117391e43daSPeter Zijlstra #ifdef CONFIG_RT_GROUP_SCHED 118391e43daSPeter Zijlstra struct sched_rt_entity **rt_se; 119391e43daSPeter Zijlstra struct rt_rq **rt_rq; 120391e43daSPeter Zijlstra 121391e43daSPeter Zijlstra struct rt_bandwidth rt_bandwidth; 122391e43daSPeter Zijlstra #endif 123391e43daSPeter Zijlstra 124391e43daSPeter Zijlstra struct rcu_head rcu; 125391e43daSPeter Zijlstra struct list_head list; 126391e43daSPeter Zijlstra 127391e43daSPeter Zijlstra struct task_group *parent; 128391e43daSPeter Zijlstra struct list_head siblings; 129391e43daSPeter Zijlstra struct list_head children; 130391e43daSPeter Zijlstra 131391e43daSPeter Zijlstra #ifdef CONFIG_SCHED_AUTOGROUP 132391e43daSPeter Zijlstra struct autogroup *autogroup; 133391e43daSPeter Zijlstra #endif 134391e43daSPeter Zijlstra 135391e43daSPeter Zijlstra struct cfs_bandwidth cfs_bandwidth; 136391e43daSPeter Zijlstra }; 137391e43daSPeter Zijlstra 138391e43daSPeter Zijlstra #ifdef CONFIG_FAIR_GROUP_SCHED 139391e43daSPeter Zijlstra #define ROOT_TASK_GROUP_LOAD NICE_0_LOAD 140391e43daSPeter Zijlstra 141391e43daSPeter Zijlstra /* 142391e43daSPeter Zijlstra * A weight of 0 or 1 can cause arithmetics problems. 143391e43daSPeter Zijlstra * A weight of a cfs_rq is the sum of weights of which entities 144391e43daSPeter Zijlstra * are queued on this cfs_rq, so a weight of a entity should not be 145391e43daSPeter Zijlstra * too large, so as the shares value of a task group. 146391e43daSPeter Zijlstra * (The default weight is 1024 - so there's no practical 147391e43daSPeter Zijlstra * limitation from this.) 148391e43daSPeter Zijlstra */ 149391e43daSPeter Zijlstra #define MIN_SHARES (1UL << 1) 150391e43daSPeter Zijlstra #define MAX_SHARES (1UL << 18) 151391e43daSPeter Zijlstra #endif 152391e43daSPeter Zijlstra 153391e43daSPeter Zijlstra /* Default task group. 154391e43daSPeter Zijlstra * Every task in system belong to this group at bootup. 155391e43daSPeter Zijlstra */ 156391e43daSPeter Zijlstra extern struct task_group root_task_group; 157391e43daSPeter Zijlstra 158391e43daSPeter Zijlstra typedef int (*tg_visitor)(struct task_group *, void *); 159391e43daSPeter Zijlstra 160391e43daSPeter Zijlstra extern int walk_tg_tree_from(struct task_group *from, 161391e43daSPeter Zijlstra tg_visitor down, tg_visitor up, void *data); 162391e43daSPeter Zijlstra 163391e43daSPeter Zijlstra /* 164391e43daSPeter Zijlstra * Iterate the full tree, calling @down when first entering a node and @up when 165391e43daSPeter Zijlstra * leaving it for the final time. 166391e43daSPeter Zijlstra * 167391e43daSPeter Zijlstra * Caller must hold rcu_lock or sufficient equivalent. 168391e43daSPeter Zijlstra */ 169391e43daSPeter Zijlstra static inline int walk_tg_tree(tg_visitor down, tg_visitor up, void *data) 170391e43daSPeter Zijlstra { 171391e43daSPeter Zijlstra return walk_tg_tree_from(&root_task_group, down, up, data); 172391e43daSPeter Zijlstra } 173391e43daSPeter Zijlstra 174391e43daSPeter Zijlstra extern int tg_nop(struct task_group *tg, void *data); 175391e43daSPeter Zijlstra 176391e43daSPeter Zijlstra extern void free_fair_sched_group(struct task_group *tg); 177391e43daSPeter Zijlstra extern int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent); 178391e43daSPeter Zijlstra extern void unregister_fair_sched_group(struct task_group *tg, int cpu); 179391e43daSPeter Zijlstra extern void init_tg_cfs_entry(struct task_group *tg, struct cfs_rq *cfs_rq, 180391e43daSPeter Zijlstra struct sched_entity *se, int cpu, 181391e43daSPeter Zijlstra struct sched_entity *parent); 182391e43daSPeter Zijlstra extern void init_cfs_bandwidth(struct cfs_bandwidth *cfs_b); 183391e43daSPeter Zijlstra extern int sched_group_set_shares(struct task_group *tg, unsigned long shares); 184391e43daSPeter Zijlstra 185391e43daSPeter Zijlstra extern void __refill_cfs_bandwidth_runtime(struct cfs_bandwidth *cfs_b); 186391e43daSPeter Zijlstra extern void __start_cfs_bandwidth(struct cfs_bandwidth *cfs_b); 187391e43daSPeter Zijlstra extern void unthrottle_cfs_rq(struct cfs_rq *cfs_rq); 188391e43daSPeter Zijlstra 189391e43daSPeter Zijlstra extern void free_rt_sched_group(struct task_group *tg); 190391e43daSPeter Zijlstra extern int alloc_rt_sched_group(struct task_group *tg, struct task_group *parent); 191391e43daSPeter Zijlstra extern void init_tg_rt_entry(struct task_group *tg, struct rt_rq *rt_rq, 192391e43daSPeter Zijlstra struct sched_rt_entity *rt_se, int cpu, 193391e43daSPeter Zijlstra struct sched_rt_entity *parent); 194391e43daSPeter Zijlstra 195391e43daSPeter Zijlstra #else /* CONFIG_CGROUP_SCHED */ 196391e43daSPeter Zijlstra 197391e43daSPeter Zijlstra struct cfs_bandwidth { }; 198391e43daSPeter Zijlstra 199391e43daSPeter Zijlstra #endif /* CONFIG_CGROUP_SCHED */ 200391e43daSPeter Zijlstra 201391e43daSPeter Zijlstra /* CFS-related fields in a runqueue */ 202391e43daSPeter Zijlstra struct cfs_rq { 203391e43daSPeter Zijlstra struct load_weight load; 204c82513e5SPeter Zijlstra unsigned int nr_running, h_nr_running; 205391e43daSPeter Zijlstra 206391e43daSPeter Zijlstra u64 exec_clock; 207391e43daSPeter Zijlstra u64 min_vruntime; 208391e43daSPeter Zijlstra #ifndef CONFIG_64BIT 209391e43daSPeter Zijlstra u64 min_vruntime_copy; 210391e43daSPeter Zijlstra #endif 211391e43daSPeter Zijlstra 212391e43daSPeter Zijlstra struct rb_root tasks_timeline; 213391e43daSPeter Zijlstra struct rb_node *rb_leftmost; 214391e43daSPeter Zijlstra 215391e43daSPeter Zijlstra /* 216391e43daSPeter Zijlstra * 'curr' points to currently running entity on this cfs_rq. 217391e43daSPeter Zijlstra * It is set to NULL otherwise (i.e when none are currently running). 218391e43daSPeter Zijlstra */ 219391e43daSPeter Zijlstra struct sched_entity *curr, *next, *last, *skip; 220391e43daSPeter Zijlstra 221391e43daSPeter Zijlstra #ifdef CONFIG_SCHED_DEBUG 222391e43daSPeter Zijlstra unsigned int nr_spread_over; 223391e43daSPeter Zijlstra #endif 224391e43daSPeter Zijlstra 225391e43daSPeter Zijlstra #ifdef CONFIG_FAIR_GROUP_SCHED 226391e43daSPeter Zijlstra struct rq *rq; /* cpu runqueue to which this cfs_rq is attached */ 227391e43daSPeter Zijlstra 228391e43daSPeter Zijlstra /* 229391e43daSPeter Zijlstra * leaf cfs_rqs are those that hold tasks (lowest schedulable entity in 230391e43daSPeter Zijlstra * a hierarchy). Non-leaf lrqs hold other higher schedulable entities 231391e43daSPeter Zijlstra * (like users, containers etc.) 232391e43daSPeter Zijlstra * 233391e43daSPeter Zijlstra * leaf_cfs_rq_list ties together list of leaf cfs_rq's in a cpu. This 234391e43daSPeter Zijlstra * list is used during load balance. 235391e43daSPeter Zijlstra */ 236391e43daSPeter Zijlstra int on_list; 237391e43daSPeter Zijlstra struct list_head leaf_cfs_rq_list; 238391e43daSPeter Zijlstra struct task_group *tg; /* group that "owns" this runqueue */ 239391e43daSPeter Zijlstra 240391e43daSPeter Zijlstra #ifdef CONFIG_SMP 241391e43daSPeter Zijlstra /* 242391e43daSPeter Zijlstra * h_load = weight * f(tg) 243391e43daSPeter Zijlstra * 244391e43daSPeter Zijlstra * Where f(tg) is the recursive weight fraction assigned to 245391e43daSPeter Zijlstra * this group. 246391e43daSPeter Zijlstra */ 247391e43daSPeter Zijlstra unsigned long h_load; 248391e43daSPeter Zijlstra 249391e43daSPeter Zijlstra /* 250391e43daSPeter Zijlstra * Maintaining per-cpu shares distribution for group scheduling 251391e43daSPeter Zijlstra * 252391e43daSPeter Zijlstra * load_stamp is the last time we updated the load average 253391e43daSPeter Zijlstra * load_last is the last time we updated the load average and saw load 254391e43daSPeter Zijlstra * load_unacc_exec_time is currently unaccounted execution time 255391e43daSPeter Zijlstra */ 256391e43daSPeter Zijlstra u64 load_avg; 257391e43daSPeter Zijlstra u64 load_period; 258391e43daSPeter Zijlstra u64 load_stamp, load_last, load_unacc_exec_time; 259391e43daSPeter Zijlstra 260391e43daSPeter Zijlstra unsigned long load_contribution; 261391e43daSPeter Zijlstra #endif /* CONFIG_SMP */ 262391e43daSPeter Zijlstra #ifdef CONFIG_CFS_BANDWIDTH 263391e43daSPeter Zijlstra int runtime_enabled; 264391e43daSPeter Zijlstra u64 runtime_expires; 265391e43daSPeter Zijlstra s64 runtime_remaining; 266391e43daSPeter Zijlstra 267391e43daSPeter Zijlstra u64 throttled_timestamp; 268391e43daSPeter Zijlstra int throttled, throttle_count; 269391e43daSPeter Zijlstra struct list_head throttled_list; 270391e43daSPeter Zijlstra #endif /* CONFIG_CFS_BANDWIDTH */ 271391e43daSPeter Zijlstra #endif /* CONFIG_FAIR_GROUP_SCHED */ 272391e43daSPeter Zijlstra }; 273391e43daSPeter Zijlstra 274391e43daSPeter Zijlstra static inline int rt_bandwidth_enabled(void) 275391e43daSPeter Zijlstra { 276391e43daSPeter Zijlstra return sysctl_sched_rt_runtime >= 0; 277391e43daSPeter Zijlstra } 278391e43daSPeter Zijlstra 279391e43daSPeter Zijlstra /* Real-Time classes' related field in a runqueue: */ 280391e43daSPeter Zijlstra struct rt_rq { 281391e43daSPeter Zijlstra struct rt_prio_array active; 282c82513e5SPeter Zijlstra unsigned int rt_nr_running; 283391e43daSPeter Zijlstra #if defined CONFIG_SMP || defined CONFIG_RT_GROUP_SCHED 284391e43daSPeter Zijlstra struct { 285391e43daSPeter Zijlstra int curr; /* highest queued rt task prio */ 286391e43daSPeter Zijlstra #ifdef CONFIG_SMP 287391e43daSPeter Zijlstra int next; /* next highest */ 288391e43daSPeter Zijlstra #endif 289391e43daSPeter Zijlstra } highest_prio; 290391e43daSPeter Zijlstra #endif 291391e43daSPeter Zijlstra #ifdef CONFIG_SMP 292391e43daSPeter Zijlstra unsigned long rt_nr_migratory; 293391e43daSPeter Zijlstra unsigned long rt_nr_total; 294391e43daSPeter Zijlstra int overloaded; 295391e43daSPeter Zijlstra struct plist_head pushable_tasks; 296391e43daSPeter Zijlstra #endif 297391e43daSPeter Zijlstra int rt_throttled; 298391e43daSPeter Zijlstra u64 rt_time; 299391e43daSPeter Zijlstra u64 rt_runtime; 300391e43daSPeter Zijlstra /* Nests inside the rq lock: */ 301391e43daSPeter Zijlstra raw_spinlock_t rt_runtime_lock; 302391e43daSPeter Zijlstra 303391e43daSPeter Zijlstra #ifdef CONFIG_RT_GROUP_SCHED 304391e43daSPeter Zijlstra unsigned long rt_nr_boosted; 305391e43daSPeter Zijlstra 306391e43daSPeter Zijlstra struct rq *rq; 307391e43daSPeter Zijlstra struct list_head leaf_rt_rq_list; 308391e43daSPeter Zijlstra struct task_group *tg; 309391e43daSPeter Zijlstra #endif 310391e43daSPeter Zijlstra }; 311391e43daSPeter Zijlstra 312391e43daSPeter Zijlstra #ifdef CONFIG_SMP 313391e43daSPeter Zijlstra 314391e43daSPeter Zijlstra /* 315391e43daSPeter Zijlstra * We add the notion of a root-domain which will be used to define per-domain 316391e43daSPeter Zijlstra * variables. Each exclusive cpuset essentially defines an island domain by 317391e43daSPeter Zijlstra * fully partitioning the member cpus from any other cpuset. Whenever a new 318391e43daSPeter Zijlstra * exclusive cpuset is created, we also create and attach a new root-domain 319391e43daSPeter Zijlstra * object. 320391e43daSPeter Zijlstra * 321391e43daSPeter Zijlstra */ 322391e43daSPeter Zijlstra struct root_domain { 323391e43daSPeter Zijlstra atomic_t refcount; 324391e43daSPeter Zijlstra atomic_t rto_count; 325391e43daSPeter Zijlstra struct rcu_head rcu; 326391e43daSPeter Zijlstra cpumask_var_t span; 327391e43daSPeter Zijlstra cpumask_var_t online; 328391e43daSPeter Zijlstra 329391e43daSPeter Zijlstra /* 330391e43daSPeter Zijlstra * The "RT overload" flag: it gets set if a CPU has more than 331391e43daSPeter Zijlstra * one runnable RT task. 332391e43daSPeter Zijlstra */ 333391e43daSPeter Zijlstra cpumask_var_t rto_mask; 334391e43daSPeter Zijlstra struct cpupri cpupri; 335391e43daSPeter Zijlstra }; 336391e43daSPeter Zijlstra 337391e43daSPeter Zijlstra extern struct root_domain def_root_domain; 338391e43daSPeter Zijlstra 339391e43daSPeter Zijlstra #endif /* CONFIG_SMP */ 340391e43daSPeter Zijlstra 341391e43daSPeter Zijlstra /* 342391e43daSPeter Zijlstra * This is the main, per-CPU runqueue data structure. 343391e43daSPeter Zijlstra * 344391e43daSPeter Zijlstra * Locking rule: those places that want to lock multiple runqueues 345391e43daSPeter Zijlstra * (such as the load balancing or the thread migration code), lock 346391e43daSPeter Zijlstra * acquire operations must be ordered by ascending &runqueue. 347391e43daSPeter Zijlstra */ 348391e43daSPeter Zijlstra struct rq { 349391e43daSPeter Zijlstra /* runqueue lock: */ 350391e43daSPeter Zijlstra raw_spinlock_t lock; 351391e43daSPeter Zijlstra 352391e43daSPeter Zijlstra /* 353391e43daSPeter Zijlstra * nr_running and cpu_load should be in the same cacheline because 354391e43daSPeter Zijlstra * remote CPUs use both these fields when doing load calculation. 355391e43daSPeter Zijlstra */ 356c82513e5SPeter Zijlstra unsigned int nr_running; 357391e43daSPeter Zijlstra #define CPU_LOAD_IDX_MAX 5 358391e43daSPeter Zijlstra unsigned long cpu_load[CPU_LOAD_IDX_MAX]; 359391e43daSPeter Zijlstra unsigned long last_load_update_tick; 360391e43daSPeter Zijlstra #ifdef CONFIG_NO_HZ 361391e43daSPeter Zijlstra u64 nohz_stamp; 3621c792db7SSuresh Siddha unsigned long nohz_flags; 363391e43daSPeter Zijlstra #endif 364391e43daSPeter Zijlstra int skip_clock_update; 365391e43daSPeter Zijlstra 366391e43daSPeter Zijlstra /* capture load from *all* tasks on this cpu: */ 367391e43daSPeter Zijlstra struct load_weight load; 368391e43daSPeter Zijlstra unsigned long nr_load_updates; 369391e43daSPeter Zijlstra u64 nr_switches; 370391e43daSPeter Zijlstra 371391e43daSPeter Zijlstra struct cfs_rq cfs; 372391e43daSPeter Zijlstra struct rt_rq rt; 373391e43daSPeter Zijlstra 374391e43daSPeter Zijlstra #ifdef CONFIG_FAIR_GROUP_SCHED 375391e43daSPeter Zijlstra /* list of leaf cfs_rq on this cpu: */ 376391e43daSPeter Zijlstra struct list_head leaf_cfs_rq_list; 377a35b6466SPeter Zijlstra #ifdef CONFIG_SMP 378a35b6466SPeter Zijlstra unsigned long h_load_throttle; 379a35b6466SPeter Zijlstra #endif /* CONFIG_SMP */ 380a35b6466SPeter Zijlstra #endif /* CONFIG_FAIR_GROUP_SCHED */ 381a35b6466SPeter Zijlstra 382391e43daSPeter Zijlstra #ifdef CONFIG_RT_GROUP_SCHED 383391e43daSPeter Zijlstra struct list_head leaf_rt_rq_list; 384391e43daSPeter Zijlstra #endif 385391e43daSPeter Zijlstra 386391e43daSPeter Zijlstra /* 387391e43daSPeter Zijlstra * This is part of a global counter where only the total sum 388391e43daSPeter Zijlstra * over all CPUs matters. A task can increase this counter on 389391e43daSPeter Zijlstra * one CPU and if it got migrated afterwards it may decrease 390391e43daSPeter Zijlstra * it on another CPU. Always updated under the runqueue lock: 391391e43daSPeter Zijlstra */ 392391e43daSPeter Zijlstra unsigned long nr_uninterruptible; 393391e43daSPeter Zijlstra 394391e43daSPeter Zijlstra struct task_struct *curr, *idle, *stop; 395391e43daSPeter Zijlstra unsigned long next_balance; 396391e43daSPeter Zijlstra struct mm_struct *prev_mm; 397391e43daSPeter Zijlstra 398391e43daSPeter Zijlstra u64 clock; 399391e43daSPeter Zijlstra u64 clock_task; 400391e43daSPeter Zijlstra 401391e43daSPeter Zijlstra atomic_t nr_iowait; 402391e43daSPeter Zijlstra 403391e43daSPeter Zijlstra #ifdef CONFIG_SMP 404391e43daSPeter Zijlstra struct root_domain *rd; 405391e43daSPeter Zijlstra struct sched_domain *sd; 406391e43daSPeter Zijlstra 407391e43daSPeter Zijlstra unsigned long cpu_power; 408391e43daSPeter Zijlstra 409391e43daSPeter Zijlstra unsigned char idle_balance; 410391e43daSPeter Zijlstra /* For active balancing */ 411391e43daSPeter Zijlstra int post_schedule; 412391e43daSPeter Zijlstra int active_balance; 413391e43daSPeter Zijlstra int push_cpu; 414391e43daSPeter Zijlstra struct cpu_stop_work active_balance_work; 415391e43daSPeter Zijlstra /* cpu of this runqueue: */ 416391e43daSPeter Zijlstra int cpu; 417391e43daSPeter Zijlstra int online; 418391e43daSPeter Zijlstra 419367456c7SPeter Zijlstra struct list_head cfs_tasks; 420367456c7SPeter Zijlstra 421391e43daSPeter Zijlstra u64 rt_avg; 422391e43daSPeter Zijlstra u64 age_stamp; 423391e43daSPeter Zijlstra u64 idle_stamp; 424391e43daSPeter Zijlstra u64 avg_idle; 425391e43daSPeter Zijlstra #endif 426391e43daSPeter Zijlstra 427391e43daSPeter Zijlstra #ifdef CONFIG_IRQ_TIME_ACCOUNTING 428391e43daSPeter Zijlstra u64 prev_irq_time; 429391e43daSPeter Zijlstra #endif 430391e43daSPeter Zijlstra #ifdef CONFIG_PARAVIRT 431391e43daSPeter Zijlstra u64 prev_steal_time; 432391e43daSPeter Zijlstra #endif 433391e43daSPeter Zijlstra #ifdef CONFIG_PARAVIRT_TIME_ACCOUNTING 434391e43daSPeter Zijlstra u64 prev_steal_time_rq; 435391e43daSPeter Zijlstra #endif 436391e43daSPeter Zijlstra 437391e43daSPeter Zijlstra /* calc_load related fields */ 438391e43daSPeter Zijlstra unsigned long calc_load_update; 439391e43daSPeter Zijlstra long calc_load_active; 440391e43daSPeter Zijlstra 441391e43daSPeter Zijlstra #ifdef CONFIG_SCHED_HRTICK 442391e43daSPeter Zijlstra #ifdef CONFIG_SMP 443391e43daSPeter Zijlstra int hrtick_csd_pending; 444391e43daSPeter Zijlstra struct call_single_data hrtick_csd; 445391e43daSPeter Zijlstra #endif 446391e43daSPeter Zijlstra struct hrtimer hrtick_timer; 447391e43daSPeter Zijlstra #endif 448391e43daSPeter Zijlstra 449391e43daSPeter Zijlstra #ifdef CONFIG_SCHEDSTATS 450391e43daSPeter Zijlstra /* latency stats */ 451391e43daSPeter Zijlstra struct sched_info rq_sched_info; 452391e43daSPeter Zijlstra unsigned long long rq_cpu_time; 453391e43daSPeter Zijlstra /* could above be rq->cfs_rq.exec_clock + rq->rt_rq.rt_runtime ? */ 454391e43daSPeter Zijlstra 455391e43daSPeter Zijlstra /* sys_sched_yield() stats */ 456391e43daSPeter Zijlstra unsigned int yld_count; 457391e43daSPeter Zijlstra 458391e43daSPeter Zijlstra /* schedule() stats */ 459391e43daSPeter Zijlstra unsigned int sched_count; 460391e43daSPeter Zijlstra unsigned int sched_goidle; 461391e43daSPeter Zijlstra 462391e43daSPeter Zijlstra /* try_to_wake_up() stats */ 463391e43daSPeter Zijlstra unsigned int ttwu_count; 464391e43daSPeter Zijlstra unsigned int ttwu_local; 465391e43daSPeter Zijlstra #endif 466391e43daSPeter Zijlstra 467391e43daSPeter Zijlstra #ifdef CONFIG_SMP 468391e43daSPeter Zijlstra struct llist_head wake_list; 469391e43daSPeter Zijlstra #endif 47018bf2805SBen Segall 47118bf2805SBen Segall struct sched_avg avg; 472391e43daSPeter Zijlstra }; 473391e43daSPeter Zijlstra 474391e43daSPeter Zijlstra static inline int cpu_of(struct rq *rq) 475391e43daSPeter Zijlstra { 476391e43daSPeter Zijlstra #ifdef CONFIG_SMP 477391e43daSPeter Zijlstra return rq->cpu; 478391e43daSPeter Zijlstra #else 479391e43daSPeter Zijlstra return 0; 480391e43daSPeter Zijlstra #endif 481391e43daSPeter Zijlstra } 482391e43daSPeter Zijlstra 483391e43daSPeter Zijlstra DECLARE_PER_CPU(struct rq, runqueues); 484391e43daSPeter Zijlstra 485518cd623SPeter Zijlstra #define cpu_rq(cpu) (&per_cpu(runqueues, (cpu))) 486518cd623SPeter Zijlstra #define this_rq() (&__get_cpu_var(runqueues)) 487518cd623SPeter Zijlstra #define task_rq(p) cpu_rq(task_cpu(p)) 488518cd623SPeter Zijlstra #define cpu_curr(cpu) (cpu_rq(cpu)->curr) 489518cd623SPeter Zijlstra #define raw_rq() (&__raw_get_cpu_var(runqueues)) 490518cd623SPeter Zijlstra 491518cd623SPeter Zijlstra #ifdef CONFIG_SMP 492518cd623SPeter Zijlstra 493391e43daSPeter Zijlstra #define rcu_dereference_check_sched_domain(p) \ 494391e43daSPeter Zijlstra rcu_dereference_check((p), \ 495391e43daSPeter Zijlstra lockdep_is_held(&sched_domains_mutex)) 496391e43daSPeter Zijlstra 497391e43daSPeter Zijlstra /* 498391e43daSPeter Zijlstra * The domain tree (rq->sd) is protected by RCU's quiescent state transition. 499391e43daSPeter Zijlstra * See detach_destroy_domains: synchronize_sched for details. 500391e43daSPeter Zijlstra * 501391e43daSPeter Zijlstra * The domain tree of any CPU may only be accessed from within 502391e43daSPeter Zijlstra * preempt-disabled sections. 503391e43daSPeter Zijlstra */ 504391e43daSPeter Zijlstra #define for_each_domain(cpu, __sd) \ 505518cd623SPeter Zijlstra for (__sd = rcu_dereference_check_sched_domain(cpu_rq(cpu)->sd); \ 506518cd623SPeter Zijlstra __sd; __sd = __sd->parent) 507391e43daSPeter Zijlstra 50877e81365SSuresh Siddha #define for_each_lower_domain(sd) for (; sd; sd = sd->child) 50977e81365SSuresh Siddha 510518cd623SPeter Zijlstra /** 511518cd623SPeter Zijlstra * highest_flag_domain - Return highest sched_domain containing flag. 512518cd623SPeter Zijlstra * @cpu: The cpu whose highest level of sched domain is to 513518cd623SPeter Zijlstra * be returned. 514518cd623SPeter Zijlstra * @flag: The flag to check for the highest sched_domain 515518cd623SPeter Zijlstra * for the given cpu. 516518cd623SPeter Zijlstra * 517518cd623SPeter Zijlstra * Returns the highest sched_domain of a cpu which contains the given flag. 518518cd623SPeter Zijlstra */ 519518cd623SPeter Zijlstra static inline struct sched_domain *highest_flag_domain(int cpu, int flag) 520518cd623SPeter Zijlstra { 521518cd623SPeter Zijlstra struct sched_domain *sd, *hsd = NULL; 522518cd623SPeter Zijlstra 523518cd623SPeter Zijlstra for_each_domain(cpu, sd) { 524518cd623SPeter Zijlstra if (!(sd->flags & flag)) 525518cd623SPeter Zijlstra break; 526518cd623SPeter Zijlstra hsd = sd; 527518cd623SPeter Zijlstra } 528518cd623SPeter Zijlstra 529518cd623SPeter Zijlstra return hsd; 530518cd623SPeter Zijlstra } 531518cd623SPeter Zijlstra 532518cd623SPeter Zijlstra DECLARE_PER_CPU(struct sched_domain *, sd_llc); 533518cd623SPeter Zijlstra DECLARE_PER_CPU(int, sd_llc_id); 534518cd623SPeter Zijlstra 535c1174876SPeter Zijlstra extern int group_balance_cpu(struct sched_group *sg); 536c1174876SPeter Zijlstra 537518cd623SPeter Zijlstra #endif /* CONFIG_SMP */ 538391e43daSPeter Zijlstra 539391e43daSPeter Zijlstra #include "stats.h" 540391e43daSPeter Zijlstra #include "auto_group.h" 541391e43daSPeter Zijlstra 542391e43daSPeter Zijlstra #ifdef CONFIG_CGROUP_SCHED 543391e43daSPeter Zijlstra 544391e43daSPeter Zijlstra /* 545391e43daSPeter Zijlstra * Return the group to which this tasks belongs. 546391e43daSPeter Zijlstra * 5478323f26cSPeter Zijlstra * We cannot use task_subsys_state() and friends because the cgroup 5488323f26cSPeter Zijlstra * subsystem changes that value before the cgroup_subsys::attach() method 5498323f26cSPeter Zijlstra * is called, therefore we cannot pin it and might observe the wrong value. 5508323f26cSPeter Zijlstra * 5518323f26cSPeter Zijlstra * The same is true for autogroup's p->signal->autogroup->tg, the autogroup 5528323f26cSPeter Zijlstra * core changes this before calling sched_move_task(). 5538323f26cSPeter Zijlstra * 5548323f26cSPeter Zijlstra * Instead we use a 'copy' which is updated from sched_move_task() while 5558323f26cSPeter Zijlstra * holding both task_struct::pi_lock and rq::lock. 556391e43daSPeter Zijlstra */ 557391e43daSPeter Zijlstra static inline struct task_group *task_group(struct task_struct *p) 558391e43daSPeter Zijlstra { 5598323f26cSPeter Zijlstra return p->sched_task_group; 560391e43daSPeter Zijlstra } 561391e43daSPeter Zijlstra 562391e43daSPeter Zijlstra /* Change a task's cfs_rq and parent entity if it moves across CPUs/groups */ 563391e43daSPeter Zijlstra static inline void set_task_rq(struct task_struct *p, unsigned int cpu) 564391e43daSPeter Zijlstra { 565391e43daSPeter Zijlstra #if defined(CONFIG_FAIR_GROUP_SCHED) || defined(CONFIG_RT_GROUP_SCHED) 566391e43daSPeter Zijlstra struct task_group *tg = task_group(p); 567391e43daSPeter Zijlstra #endif 568391e43daSPeter Zijlstra 569391e43daSPeter Zijlstra #ifdef CONFIG_FAIR_GROUP_SCHED 570391e43daSPeter Zijlstra p->se.cfs_rq = tg->cfs_rq[cpu]; 571391e43daSPeter Zijlstra p->se.parent = tg->se[cpu]; 572391e43daSPeter Zijlstra #endif 573391e43daSPeter Zijlstra 574391e43daSPeter Zijlstra #ifdef CONFIG_RT_GROUP_SCHED 575391e43daSPeter Zijlstra p->rt.rt_rq = tg->rt_rq[cpu]; 576391e43daSPeter Zijlstra p->rt.parent = tg->rt_se[cpu]; 577391e43daSPeter Zijlstra #endif 578391e43daSPeter Zijlstra } 579391e43daSPeter Zijlstra 580391e43daSPeter Zijlstra #else /* CONFIG_CGROUP_SCHED */ 581391e43daSPeter Zijlstra 582391e43daSPeter Zijlstra static inline void set_task_rq(struct task_struct *p, unsigned int cpu) { } 583391e43daSPeter Zijlstra static inline struct task_group *task_group(struct task_struct *p) 584391e43daSPeter Zijlstra { 585391e43daSPeter Zijlstra return NULL; 586391e43daSPeter Zijlstra } 587391e43daSPeter Zijlstra 588391e43daSPeter Zijlstra #endif /* CONFIG_CGROUP_SCHED */ 589391e43daSPeter Zijlstra 590391e43daSPeter Zijlstra static inline void __set_task_cpu(struct task_struct *p, unsigned int cpu) 591391e43daSPeter Zijlstra { 592391e43daSPeter Zijlstra set_task_rq(p, cpu); 593391e43daSPeter Zijlstra #ifdef CONFIG_SMP 594391e43daSPeter Zijlstra /* 595391e43daSPeter Zijlstra * After ->cpu is set up to a new value, task_rq_lock(p, ...) can be 596391e43daSPeter Zijlstra * successfuly executed on another CPU. We must ensure that updates of 597391e43daSPeter Zijlstra * per-task data have been completed by this moment. 598391e43daSPeter Zijlstra */ 599391e43daSPeter Zijlstra smp_wmb(); 600391e43daSPeter Zijlstra task_thread_info(p)->cpu = cpu; 601391e43daSPeter Zijlstra #endif 602391e43daSPeter Zijlstra } 603391e43daSPeter Zijlstra 604391e43daSPeter Zijlstra /* 605391e43daSPeter Zijlstra * Tunables that become constants when CONFIG_SCHED_DEBUG is off: 606391e43daSPeter Zijlstra */ 607391e43daSPeter Zijlstra #ifdef CONFIG_SCHED_DEBUG 608c5905afbSIngo Molnar # include <linux/static_key.h> 609391e43daSPeter Zijlstra # define const_debug __read_mostly 610391e43daSPeter Zijlstra #else 611391e43daSPeter Zijlstra # define const_debug const 612391e43daSPeter Zijlstra #endif 613391e43daSPeter Zijlstra 614391e43daSPeter Zijlstra extern const_debug unsigned int sysctl_sched_features; 615391e43daSPeter Zijlstra 616391e43daSPeter Zijlstra #define SCHED_FEAT(name, enabled) \ 617391e43daSPeter Zijlstra __SCHED_FEAT_##name , 618391e43daSPeter Zijlstra 619391e43daSPeter Zijlstra enum { 620391e43daSPeter Zijlstra #include "features.h" 621f8b6d1ccSPeter Zijlstra __SCHED_FEAT_NR, 622391e43daSPeter Zijlstra }; 623391e43daSPeter Zijlstra 624391e43daSPeter Zijlstra #undef SCHED_FEAT 625391e43daSPeter Zijlstra 626f8b6d1ccSPeter Zijlstra #if defined(CONFIG_SCHED_DEBUG) && defined(HAVE_JUMP_LABEL) 627c5905afbSIngo Molnar static __always_inline bool static_branch__true(struct static_key *key) 628f8b6d1ccSPeter Zijlstra { 629c5905afbSIngo Molnar return static_key_true(key); /* Not out of line branch. */ 630f8b6d1ccSPeter Zijlstra } 631f8b6d1ccSPeter Zijlstra 632c5905afbSIngo Molnar static __always_inline bool static_branch__false(struct static_key *key) 633f8b6d1ccSPeter Zijlstra { 634c5905afbSIngo Molnar return static_key_false(key); /* Out of line branch. */ 635f8b6d1ccSPeter Zijlstra } 636f8b6d1ccSPeter Zijlstra 637f8b6d1ccSPeter Zijlstra #define SCHED_FEAT(name, enabled) \ 638c5905afbSIngo Molnar static __always_inline bool static_branch_##name(struct static_key *key) \ 639f8b6d1ccSPeter Zijlstra { \ 640f8b6d1ccSPeter Zijlstra return static_branch__##enabled(key); \ 641f8b6d1ccSPeter Zijlstra } 642f8b6d1ccSPeter Zijlstra 643f8b6d1ccSPeter Zijlstra #include "features.h" 644f8b6d1ccSPeter Zijlstra 645f8b6d1ccSPeter Zijlstra #undef SCHED_FEAT 646f8b6d1ccSPeter Zijlstra 647c5905afbSIngo Molnar extern struct static_key sched_feat_keys[__SCHED_FEAT_NR]; 648f8b6d1ccSPeter Zijlstra #define sched_feat(x) (static_branch_##x(&sched_feat_keys[__SCHED_FEAT_##x])) 649f8b6d1ccSPeter Zijlstra #else /* !(SCHED_DEBUG && HAVE_JUMP_LABEL) */ 650391e43daSPeter Zijlstra #define sched_feat(x) (sysctl_sched_features & (1UL << __SCHED_FEAT_##x)) 651f8b6d1ccSPeter Zijlstra #endif /* SCHED_DEBUG && HAVE_JUMP_LABEL */ 652391e43daSPeter Zijlstra 653391e43daSPeter Zijlstra static inline u64 global_rt_period(void) 654391e43daSPeter Zijlstra { 655391e43daSPeter Zijlstra return (u64)sysctl_sched_rt_period * NSEC_PER_USEC; 656391e43daSPeter Zijlstra } 657391e43daSPeter Zijlstra 658391e43daSPeter Zijlstra static inline u64 global_rt_runtime(void) 659391e43daSPeter Zijlstra { 660391e43daSPeter Zijlstra if (sysctl_sched_rt_runtime < 0) 661391e43daSPeter Zijlstra return RUNTIME_INF; 662391e43daSPeter Zijlstra 663391e43daSPeter Zijlstra return (u64)sysctl_sched_rt_runtime * NSEC_PER_USEC; 664391e43daSPeter Zijlstra } 665391e43daSPeter Zijlstra 666391e43daSPeter Zijlstra 667391e43daSPeter Zijlstra 668391e43daSPeter Zijlstra static inline int task_current(struct rq *rq, struct task_struct *p) 669391e43daSPeter Zijlstra { 670391e43daSPeter Zijlstra return rq->curr == p; 671391e43daSPeter Zijlstra } 672391e43daSPeter Zijlstra 673391e43daSPeter Zijlstra static inline int task_running(struct rq *rq, struct task_struct *p) 674391e43daSPeter Zijlstra { 675391e43daSPeter Zijlstra #ifdef CONFIG_SMP 676391e43daSPeter Zijlstra return p->on_cpu; 677391e43daSPeter Zijlstra #else 678391e43daSPeter Zijlstra return task_current(rq, p); 679391e43daSPeter Zijlstra #endif 680391e43daSPeter Zijlstra } 681391e43daSPeter Zijlstra 682391e43daSPeter Zijlstra 683391e43daSPeter Zijlstra #ifndef prepare_arch_switch 684391e43daSPeter Zijlstra # define prepare_arch_switch(next) do { } while (0) 685391e43daSPeter Zijlstra #endif 686391e43daSPeter Zijlstra #ifndef finish_arch_switch 687391e43daSPeter Zijlstra # define finish_arch_switch(prev) do { } while (0) 688391e43daSPeter Zijlstra #endif 68901f23e16SCatalin Marinas #ifndef finish_arch_post_lock_switch 69001f23e16SCatalin Marinas # define finish_arch_post_lock_switch() do { } while (0) 69101f23e16SCatalin Marinas #endif 692391e43daSPeter Zijlstra 693391e43daSPeter Zijlstra #ifndef __ARCH_WANT_UNLOCKED_CTXSW 694391e43daSPeter Zijlstra static inline void prepare_lock_switch(struct rq *rq, struct task_struct *next) 695391e43daSPeter Zijlstra { 696391e43daSPeter Zijlstra #ifdef CONFIG_SMP 697391e43daSPeter Zijlstra /* 698391e43daSPeter Zijlstra * We can optimise this out completely for !SMP, because the 699391e43daSPeter Zijlstra * SMP rebalancing from interrupt is the only thing that cares 700391e43daSPeter Zijlstra * here. 701391e43daSPeter Zijlstra */ 702391e43daSPeter Zijlstra next->on_cpu = 1; 703391e43daSPeter Zijlstra #endif 704391e43daSPeter Zijlstra } 705391e43daSPeter Zijlstra 706391e43daSPeter Zijlstra static inline void finish_lock_switch(struct rq *rq, struct task_struct *prev) 707391e43daSPeter Zijlstra { 708391e43daSPeter Zijlstra #ifdef CONFIG_SMP 709391e43daSPeter Zijlstra /* 710391e43daSPeter Zijlstra * After ->on_cpu is cleared, the task can be moved to a different CPU. 711391e43daSPeter Zijlstra * We must ensure this doesn't happen until the switch is completely 712391e43daSPeter Zijlstra * finished. 713391e43daSPeter Zijlstra */ 714391e43daSPeter Zijlstra smp_wmb(); 715391e43daSPeter Zijlstra prev->on_cpu = 0; 716391e43daSPeter Zijlstra #endif 717391e43daSPeter Zijlstra #ifdef CONFIG_DEBUG_SPINLOCK 718391e43daSPeter Zijlstra /* this is a valid case when another task releases the spinlock */ 719391e43daSPeter Zijlstra rq->lock.owner = current; 720391e43daSPeter Zijlstra #endif 721391e43daSPeter Zijlstra /* 722391e43daSPeter Zijlstra * If we are tracking spinlock dependencies then we have to 723391e43daSPeter Zijlstra * fix up the runqueue lock - which gets 'carried over' from 724391e43daSPeter Zijlstra * prev into current: 725391e43daSPeter Zijlstra */ 726391e43daSPeter Zijlstra spin_acquire(&rq->lock.dep_map, 0, 0, _THIS_IP_); 727391e43daSPeter Zijlstra 728391e43daSPeter Zijlstra raw_spin_unlock_irq(&rq->lock); 729391e43daSPeter Zijlstra } 730391e43daSPeter Zijlstra 731391e43daSPeter Zijlstra #else /* __ARCH_WANT_UNLOCKED_CTXSW */ 732391e43daSPeter Zijlstra static inline void prepare_lock_switch(struct rq *rq, struct task_struct *next) 733391e43daSPeter Zijlstra { 734391e43daSPeter Zijlstra #ifdef CONFIG_SMP 735391e43daSPeter Zijlstra /* 736391e43daSPeter Zijlstra * We can optimise this out completely for !SMP, because the 737391e43daSPeter Zijlstra * SMP rebalancing from interrupt is the only thing that cares 738391e43daSPeter Zijlstra * here. 739391e43daSPeter Zijlstra */ 740391e43daSPeter Zijlstra next->on_cpu = 1; 741391e43daSPeter Zijlstra #endif 742391e43daSPeter Zijlstra raw_spin_unlock(&rq->lock); 743391e43daSPeter Zijlstra } 744391e43daSPeter Zijlstra 745391e43daSPeter Zijlstra static inline void finish_lock_switch(struct rq *rq, struct task_struct *prev) 746391e43daSPeter Zijlstra { 747391e43daSPeter Zijlstra #ifdef CONFIG_SMP 748391e43daSPeter Zijlstra /* 749391e43daSPeter Zijlstra * After ->on_cpu is cleared, the task can be moved to a different CPU. 750391e43daSPeter Zijlstra * We must ensure this doesn't happen until the switch is completely 751391e43daSPeter Zijlstra * finished. 752391e43daSPeter Zijlstra */ 753391e43daSPeter Zijlstra smp_wmb(); 754391e43daSPeter Zijlstra prev->on_cpu = 0; 755391e43daSPeter Zijlstra #endif 756391e43daSPeter Zijlstra local_irq_enable(); 757391e43daSPeter Zijlstra } 758391e43daSPeter Zijlstra #endif /* __ARCH_WANT_UNLOCKED_CTXSW */ 759391e43daSPeter Zijlstra 760391e43daSPeter Zijlstra 761391e43daSPeter Zijlstra static inline void update_load_add(struct load_weight *lw, unsigned long inc) 762391e43daSPeter Zijlstra { 763391e43daSPeter Zijlstra lw->weight += inc; 764391e43daSPeter Zijlstra lw->inv_weight = 0; 765391e43daSPeter Zijlstra } 766391e43daSPeter Zijlstra 767391e43daSPeter Zijlstra static inline void update_load_sub(struct load_weight *lw, unsigned long dec) 768391e43daSPeter Zijlstra { 769391e43daSPeter Zijlstra lw->weight -= dec; 770391e43daSPeter Zijlstra lw->inv_weight = 0; 771391e43daSPeter Zijlstra } 772391e43daSPeter Zijlstra 773391e43daSPeter Zijlstra static inline void update_load_set(struct load_weight *lw, unsigned long w) 774391e43daSPeter Zijlstra { 775391e43daSPeter Zijlstra lw->weight = w; 776391e43daSPeter Zijlstra lw->inv_weight = 0; 777391e43daSPeter Zijlstra } 778391e43daSPeter Zijlstra 779391e43daSPeter Zijlstra /* 780391e43daSPeter Zijlstra * To aid in avoiding the subversion of "niceness" due to uneven distribution 781391e43daSPeter Zijlstra * of tasks with abnormal "nice" values across CPUs the contribution that 782391e43daSPeter Zijlstra * each task makes to its run queue's load is weighted according to its 783391e43daSPeter Zijlstra * scheduling class and "nice" value. For SCHED_NORMAL tasks this is just a 784391e43daSPeter Zijlstra * scaled version of the new time slice allocation that they receive on time 785391e43daSPeter Zijlstra * slice expiry etc. 786391e43daSPeter Zijlstra */ 787391e43daSPeter Zijlstra 788391e43daSPeter Zijlstra #define WEIGHT_IDLEPRIO 3 789391e43daSPeter Zijlstra #define WMULT_IDLEPRIO 1431655765 790391e43daSPeter Zijlstra 791391e43daSPeter Zijlstra /* 792391e43daSPeter Zijlstra * Nice levels are multiplicative, with a gentle 10% change for every 793391e43daSPeter Zijlstra * nice level changed. I.e. when a CPU-bound task goes from nice 0 to 794391e43daSPeter Zijlstra * nice 1, it will get ~10% less CPU time than another CPU-bound task 795391e43daSPeter Zijlstra * that remained on nice 0. 796391e43daSPeter Zijlstra * 797391e43daSPeter Zijlstra * The "10% effect" is relative and cumulative: from _any_ nice level, 798391e43daSPeter Zijlstra * if you go up 1 level, it's -10% CPU usage, if you go down 1 level 799391e43daSPeter Zijlstra * it's +10% CPU usage. (to achieve that we use a multiplier of 1.25. 800391e43daSPeter Zijlstra * If a task goes up by ~10% and another task goes down by ~10% then 801391e43daSPeter Zijlstra * the relative distance between them is ~25%.) 802391e43daSPeter Zijlstra */ 803391e43daSPeter Zijlstra static const int prio_to_weight[40] = { 804391e43daSPeter Zijlstra /* -20 */ 88761, 71755, 56483, 46273, 36291, 805391e43daSPeter Zijlstra /* -15 */ 29154, 23254, 18705, 14949, 11916, 806391e43daSPeter Zijlstra /* -10 */ 9548, 7620, 6100, 4904, 3906, 807391e43daSPeter Zijlstra /* -5 */ 3121, 2501, 1991, 1586, 1277, 808391e43daSPeter Zijlstra /* 0 */ 1024, 820, 655, 526, 423, 809391e43daSPeter Zijlstra /* 5 */ 335, 272, 215, 172, 137, 810391e43daSPeter Zijlstra /* 10 */ 110, 87, 70, 56, 45, 811391e43daSPeter Zijlstra /* 15 */ 36, 29, 23, 18, 15, 812391e43daSPeter Zijlstra }; 813391e43daSPeter Zijlstra 814391e43daSPeter Zijlstra /* 815391e43daSPeter Zijlstra * Inverse (2^32/x) values of the prio_to_weight[] array, precalculated. 816391e43daSPeter Zijlstra * 817391e43daSPeter Zijlstra * In cases where the weight does not change often, we can use the 818391e43daSPeter Zijlstra * precalculated inverse to speed up arithmetics by turning divisions 819391e43daSPeter Zijlstra * into multiplications: 820391e43daSPeter Zijlstra */ 821391e43daSPeter Zijlstra static const u32 prio_to_wmult[40] = { 822391e43daSPeter Zijlstra /* -20 */ 48388, 59856, 76040, 92818, 118348, 823391e43daSPeter Zijlstra /* -15 */ 147320, 184698, 229616, 287308, 360437, 824391e43daSPeter Zijlstra /* -10 */ 449829, 563644, 704093, 875809, 1099582, 825391e43daSPeter Zijlstra /* -5 */ 1376151, 1717300, 2157191, 2708050, 3363326, 826391e43daSPeter Zijlstra /* 0 */ 4194304, 5237765, 6557202, 8165337, 10153587, 827391e43daSPeter Zijlstra /* 5 */ 12820798, 15790321, 19976592, 24970740, 31350126, 828391e43daSPeter Zijlstra /* 10 */ 39045157, 49367440, 61356676, 76695844, 95443717, 829391e43daSPeter Zijlstra /* 15 */ 119304647, 148102320, 186737708, 238609294, 286331153, 830391e43daSPeter Zijlstra }; 831391e43daSPeter Zijlstra 832391e43daSPeter Zijlstra /* Time spent by the tasks of the cpu accounting group executing in ... */ 833391e43daSPeter Zijlstra enum cpuacct_stat_index { 834391e43daSPeter Zijlstra CPUACCT_STAT_USER, /* ... user mode */ 835391e43daSPeter Zijlstra CPUACCT_STAT_SYSTEM, /* ... kernel mode */ 836391e43daSPeter Zijlstra 837391e43daSPeter Zijlstra CPUACCT_STAT_NSTATS, 838391e43daSPeter Zijlstra }; 839391e43daSPeter Zijlstra 840391e43daSPeter Zijlstra 841391e43daSPeter Zijlstra #define sched_class_highest (&stop_sched_class) 842391e43daSPeter Zijlstra #define for_each_class(class) \ 843391e43daSPeter Zijlstra for (class = sched_class_highest; class; class = class->next) 844391e43daSPeter Zijlstra 845391e43daSPeter Zijlstra extern const struct sched_class stop_sched_class; 846391e43daSPeter Zijlstra extern const struct sched_class rt_sched_class; 847391e43daSPeter Zijlstra extern const struct sched_class fair_sched_class; 848391e43daSPeter Zijlstra extern const struct sched_class idle_sched_class; 849391e43daSPeter Zijlstra 850391e43daSPeter Zijlstra 851391e43daSPeter Zijlstra #ifdef CONFIG_SMP 852391e43daSPeter Zijlstra 853391e43daSPeter Zijlstra extern void trigger_load_balance(struct rq *rq, int cpu); 854391e43daSPeter Zijlstra extern void idle_balance(int this_cpu, struct rq *this_rq); 855391e43daSPeter Zijlstra 856391e43daSPeter Zijlstra #else /* CONFIG_SMP */ 857391e43daSPeter Zijlstra 858391e43daSPeter Zijlstra static inline void idle_balance(int cpu, struct rq *rq) 859391e43daSPeter Zijlstra { 860391e43daSPeter Zijlstra } 861391e43daSPeter Zijlstra 862391e43daSPeter Zijlstra #endif 863391e43daSPeter Zijlstra 864391e43daSPeter Zijlstra extern void sysrq_sched_debug_show(void); 865391e43daSPeter Zijlstra extern void sched_init_granularity(void); 866391e43daSPeter Zijlstra extern void update_max_interval(void); 867391e43daSPeter Zijlstra extern void update_group_power(struct sched_domain *sd, int cpu); 868391e43daSPeter Zijlstra extern int update_runtime(struct notifier_block *nfb, unsigned long action, void *hcpu); 869391e43daSPeter Zijlstra extern void init_sched_rt_class(void); 870391e43daSPeter Zijlstra extern void init_sched_fair_class(void); 871391e43daSPeter Zijlstra 872391e43daSPeter Zijlstra extern void resched_task(struct task_struct *p); 873391e43daSPeter Zijlstra extern void resched_cpu(int cpu); 874391e43daSPeter Zijlstra 875391e43daSPeter Zijlstra extern struct rt_bandwidth def_rt_bandwidth; 876391e43daSPeter Zijlstra extern void init_rt_bandwidth(struct rt_bandwidth *rt_b, u64 period, u64 runtime); 877391e43daSPeter Zijlstra 878556061b0SPeter Zijlstra extern void update_idle_cpu_load(struct rq *this_rq); 879391e43daSPeter Zijlstra 880391e43daSPeter Zijlstra #ifdef CONFIG_CGROUP_CPUACCT 88154c707e9SGlauber Costa #include <linux/cgroup.h> 88254c707e9SGlauber Costa /* track cpu usage of a group of tasks and its child groups */ 88354c707e9SGlauber Costa struct cpuacct { 88454c707e9SGlauber Costa struct cgroup_subsys_state css; 88554c707e9SGlauber Costa /* cpuusage holds pointer to a u64-type object on every cpu */ 88654c707e9SGlauber Costa u64 __percpu *cpuusage; 88754c707e9SGlauber Costa struct kernel_cpustat __percpu *cpustat; 88854c707e9SGlauber Costa }; 88954c707e9SGlauber Costa 89073fbec60SFrederic Weisbecker extern struct cgroup_subsys cpuacct_subsys; 89173fbec60SFrederic Weisbecker extern struct cpuacct root_cpuacct; 89273fbec60SFrederic Weisbecker 89354c707e9SGlauber Costa /* return cpu accounting group corresponding to this container */ 89454c707e9SGlauber Costa static inline struct cpuacct *cgroup_ca(struct cgroup *cgrp) 89554c707e9SGlauber Costa { 89654c707e9SGlauber Costa return container_of(cgroup_subsys_state(cgrp, cpuacct_subsys_id), 89754c707e9SGlauber Costa struct cpuacct, css); 89854c707e9SGlauber Costa } 89954c707e9SGlauber Costa 90054c707e9SGlauber Costa /* return cpu accounting group to which this task belongs */ 90154c707e9SGlauber Costa static inline struct cpuacct *task_ca(struct task_struct *tsk) 90254c707e9SGlauber Costa { 90354c707e9SGlauber Costa return container_of(task_subsys_state(tsk, cpuacct_subsys_id), 90454c707e9SGlauber Costa struct cpuacct, css); 90554c707e9SGlauber Costa } 90654c707e9SGlauber Costa 90754c707e9SGlauber Costa static inline struct cpuacct *parent_ca(struct cpuacct *ca) 90854c707e9SGlauber Costa { 90954c707e9SGlauber Costa if (!ca || !ca->css.cgroup->parent) 91054c707e9SGlauber Costa return NULL; 91154c707e9SGlauber Costa return cgroup_ca(ca->css.cgroup->parent); 91254c707e9SGlauber Costa } 91354c707e9SGlauber Costa 914391e43daSPeter Zijlstra extern void cpuacct_charge(struct task_struct *tsk, u64 cputime); 915391e43daSPeter Zijlstra #else 916391e43daSPeter Zijlstra static inline void cpuacct_charge(struct task_struct *tsk, u64 cputime) {} 917391e43daSPeter Zijlstra #endif 918391e43daSPeter Zijlstra 91973fbec60SFrederic Weisbecker #ifdef CONFIG_PARAVIRT 92073fbec60SFrederic Weisbecker static inline u64 steal_ticks(u64 steal) 92173fbec60SFrederic Weisbecker { 92273fbec60SFrederic Weisbecker if (unlikely(steal > NSEC_PER_SEC)) 92373fbec60SFrederic Weisbecker return div_u64(steal, TICK_NSEC); 92473fbec60SFrederic Weisbecker 92573fbec60SFrederic Weisbecker return __iter_div_u64_rem(steal, TICK_NSEC, &steal); 92673fbec60SFrederic Weisbecker } 92773fbec60SFrederic Weisbecker #endif 92873fbec60SFrederic Weisbecker 929391e43daSPeter Zijlstra static inline void inc_nr_running(struct rq *rq) 930391e43daSPeter Zijlstra { 931391e43daSPeter Zijlstra rq->nr_running++; 932391e43daSPeter Zijlstra } 933391e43daSPeter Zijlstra 934391e43daSPeter Zijlstra static inline void dec_nr_running(struct rq *rq) 935391e43daSPeter Zijlstra { 936391e43daSPeter Zijlstra rq->nr_running--; 937391e43daSPeter Zijlstra } 938391e43daSPeter Zijlstra 939391e43daSPeter Zijlstra extern void update_rq_clock(struct rq *rq); 940391e43daSPeter Zijlstra 941391e43daSPeter Zijlstra extern void activate_task(struct rq *rq, struct task_struct *p, int flags); 942391e43daSPeter Zijlstra extern void deactivate_task(struct rq *rq, struct task_struct *p, int flags); 943391e43daSPeter Zijlstra 944391e43daSPeter Zijlstra extern void check_preempt_curr(struct rq *rq, struct task_struct *p, int flags); 945391e43daSPeter Zijlstra 946391e43daSPeter Zijlstra extern const_debug unsigned int sysctl_sched_time_avg; 947391e43daSPeter Zijlstra extern const_debug unsigned int sysctl_sched_nr_migrate; 948391e43daSPeter Zijlstra extern const_debug unsigned int sysctl_sched_migration_cost; 949391e43daSPeter Zijlstra 950391e43daSPeter Zijlstra static inline u64 sched_avg_period(void) 951391e43daSPeter Zijlstra { 952391e43daSPeter Zijlstra return (u64)sysctl_sched_time_avg * NSEC_PER_MSEC / 2; 953391e43daSPeter Zijlstra } 954391e43daSPeter Zijlstra 955391e43daSPeter Zijlstra #ifdef CONFIG_SCHED_HRTICK 956391e43daSPeter Zijlstra 957391e43daSPeter Zijlstra /* 958391e43daSPeter Zijlstra * Use hrtick when: 959391e43daSPeter Zijlstra * - enabled by features 960391e43daSPeter Zijlstra * - hrtimer is actually high res 961391e43daSPeter Zijlstra */ 962391e43daSPeter Zijlstra static inline int hrtick_enabled(struct rq *rq) 963391e43daSPeter Zijlstra { 964391e43daSPeter Zijlstra if (!sched_feat(HRTICK)) 965391e43daSPeter Zijlstra return 0; 966391e43daSPeter Zijlstra if (!cpu_active(cpu_of(rq))) 967391e43daSPeter Zijlstra return 0; 968391e43daSPeter Zijlstra return hrtimer_is_hres_active(&rq->hrtick_timer); 969391e43daSPeter Zijlstra } 970391e43daSPeter Zijlstra 971391e43daSPeter Zijlstra void hrtick_start(struct rq *rq, u64 delay); 972391e43daSPeter Zijlstra 973b39e66eaSMike Galbraith #else 974b39e66eaSMike Galbraith 975b39e66eaSMike Galbraith static inline int hrtick_enabled(struct rq *rq) 976b39e66eaSMike Galbraith { 977b39e66eaSMike Galbraith return 0; 978b39e66eaSMike Galbraith } 979b39e66eaSMike Galbraith 980391e43daSPeter Zijlstra #endif /* CONFIG_SCHED_HRTICK */ 981391e43daSPeter Zijlstra 982391e43daSPeter Zijlstra #ifdef CONFIG_SMP 983391e43daSPeter Zijlstra extern void sched_avg_update(struct rq *rq); 984391e43daSPeter Zijlstra static inline void sched_rt_avg_update(struct rq *rq, u64 rt_delta) 985391e43daSPeter Zijlstra { 986391e43daSPeter Zijlstra rq->rt_avg += rt_delta; 987391e43daSPeter Zijlstra sched_avg_update(rq); 988391e43daSPeter Zijlstra } 989391e43daSPeter Zijlstra #else 990391e43daSPeter Zijlstra static inline void sched_rt_avg_update(struct rq *rq, u64 rt_delta) { } 991391e43daSPeter Zijlstra static inline void sched_avg_update(struct rq *rq) { } 992391e43daSPeter Zijlstra #endif 993391e43daSPeter Zijlstra 994391e43daSPeter Zijlstra extern void start_bandwidth_timer(struct hrtimer *period_timer, ktime_t period); 995391e43daSPeter Zijlstra 996391e43daSPeter Zijlstra #ifdef CONFIG_SMP 997391e43daSPeter Zijlstra #ifdef CONFIG_PREEMPT 998391e43daSPeter Zijlstra 999391e43daSPeter Zijlstra static inline void double_rq_lock(struct rq *rq1, struct rq *rq2); 1000391e43daSPeter Zijlstra 1001391e43daSPeter Zijlstra /* 1002391e43daSPeter Zijlstra * fair double_lock_balance: Safely acquires both rq->locks in a fair 1003391e43daSPeter Zijlstra * way at the expense of forcing extra atomic operations in all 1004391e43daSPeter Zijlstra * invocations. This assures that the double_lock is acquired using the 1005391e43daSPeter Zijlstra * same underlying policy as the spinlock_t on this architecture, which 1006391e43daSPeter Zijlstra * reduces latency compared to the unfair variant below. However, it 1007391e43daSPeter Zijlstra * also adds more overhead and therefore may reduce throughput. 1008391e43daSPeter Zijlstra */ 1009391e43daSPeter Zijlstra static inline int _double_lock_balance(struct rq *this_rq, struct rq *busiest) 1010391e43daSPeter Zijlstra __releases(this_rq->lock) 1011391e43daSPeter Zijlstra __acquires(busiest->lock) 1012391e43daSPeter Zijlstra __acquires(this_rq->lock) 1013391e43daSPeter Zijlstra { 1014391e43daSPeter Zijlstra raw_spin_unlock(&this_rq->lock); 1015391e43daSPeter Zijlstra double_rq_lock(this_rq, busiest); 1016391e43daSPeter Zijlstra 1017391e43daSPeter Zijlstra return 1; 1018391e43daSPeter Zijlstra } 1019391e43daSPeter Zijlstra 1020391e43daSPeter Zijlstra #else 1021391e43daSPeter Zijlstra /* 1022391e43daSPeter Zijlstra * Unfair double_lock_balance: Optimizes throughput at the expense of 1023391e43daSPeter Zijlstra * latency by eliminating extra atomic operations when the locks are 1024391e43daSPeter Zijlstra * already in proper order on entry. This favors lower cpu-ids and will 1025391e43daSPeter Zijlstra * grant the double lock to lower cpus over higher ids under contention, 1026391e43daSPeter Zijlstra * regardless of entry order into the function. 1027391e43daSPeter Zijlstra */ 1028391e43daSPeter Zijlstra static inline int _double_lock_balance(struct rq *this_rq, struct rq *busiest) 1029391e43daSPeter Zijlstra __releases(this_rq->lock) 1030391e43daSPeter Zijlstra __acquires(busiest->lock) 1031391e43daSPeter Zijlstra __acquires(this_rq->lock) 1032391e43daSPeter Zijlstra { 1033391e43daSPeter Zijlstra int ret = 0; 1034391e43daSPeter Zijlstra 1035391e43daSPeter Zijlstra if (unlikely(!raw_spin_trylock(&busiest->lock))) { 1036391e43daSPeter Zijlstra if (busiest < this_rq) { 1037391e43daSPeter Zijlstra raw_spin_unlock(&this_rq->lock); 1038391e43daSPeter Zijlstra raw_spin_lock(&busiest->lock); 1039391e43daSPeter Zijlstra raw_spin_lock_nested(&this_rq->lock, 1040391e43daSPeter Zijlstra SINGLE_DEPTH_NESTING); 1041391e43daSPeter Zijlstra ret = 1; 1042391e43daSPeter Zijlstra } else 1043391e43daSPeter Zijlstra raw_spin_lock_nested(&busiest->lock, 1044391e43daSPeter Zijlstra SINGLE_DEPTH_NESTING); 1045391e43daSPeter Zijlstra } 1046391e43daSPeter Zijlstra return ret; 1047391e43daSPeter Zijlstra } 1048391e43daSPeter Zijlstra 1049391e43daSPeter Zijlstra #endif /* CONFIG_PREEMPT */ 1050391e43daSPeter Zijlstra 1051391e43daSPeter Zijlstra /* 1052391e43daSPeter Zijlstra * double_lock_balance - lock the busiest runqueue, this_rq is locked already. 1053391e43daSPeter Zijlstra */ 1054391e43daSPeter Zijlstra static inline int double_lock_balance(struct rq *this_rq, struct rq *busiest) 1055391e43daSPeter Zijlstra { 1056391e43daSPeter Zijlstra if (unlikely(!irqs_disabled())) { 1057391e43daSPeter Zijlstra /* printk() doesn't work good under rq->lock */ 1058391e43daSPeter Zijlstra raw_spin_unlock(&this_rq->lock); 1059391e43daSPeter Zijlstra BUG_ON(1); 1060391e43daSPeter Zijlstra } 1061391e43daSPeter Zijlstra 1062391e43daSPeter Zijlstra return _double_lock_balance(this_rq, busiest); 1063391e43daSPeter Zijlstra } 1064391e43daSPeter Zijlstra 1065391e43daSPeter Zijlstra static inline void double_unlock_balance(struct rq *this_rq, struct rq *busiest) 1066391e43daSPeter Zijlstra __releases(busiest->lock) 1067391e43daSPeter Zijlstra { 1068391e43daSPeter Zijlstra raw_spin_unlock(&busiest->lock); 1069391e43daSPeter Zijlstra lock_set_subclass(&this_rq->lock.dep_map, 0, _RET_IP_); 1070391e43daSPeter Zijlstra } 1071391e43daSPeter Zijlstra 1072391e43daSPeter Zijlstra /* 1073391e43daSPeter Zijlstra * double_rq_lock - safely lock two runqueues 1074391e43daSPeter Zijlstra * 1075391e43daSPeter Zijlstra * Note this does not disable interrupts like task_rq_lock, 1076391e43daSPeter Zijlstra * you need to do so manually before calling. 1077391e43daSPeter Zijlstra */ 1078391e43daSPeter Zijlstra static inline void double_rq_lock(struct rq *rq1, struct rq *rq2) 1079391e43daSPeter Zijlstra __acquires(rq1->lock) 1080391e43daSPeter Zijlstra __acquires(rq2->lock) 1081391e43daSPeter Zijlstra { 1082391e43daSPeter Zijlstra BUG_ON(!irqs_disabled()); 1083391e43daSPeter Zijlstra if (rq1 == rq2) { 1084391e43daSPeter Zijlstra raw_spin_lock(&rq1->lock); 1085391e43daSPeter Zijlstra __acquire(rq2->lock); /* Fake it out ;) */ 1086391e43daSPeter Zijlstra } else { 1087391e43daSPeter Zijlstra if (rq1 < rq2) { 1088391e43daSPeter Zijlstra raw_spin_lock(&rq1->lock); 1089391e43daSPeter Zijlstra raw_spin_lock_nested(&rq2->lock, SINGLE_DEPTH_NESTING); 1090391e43daSPeter Zijlstra } else { 1091391e43daSPeter Zijlstra raw_spin_lock(&rq2->lock); 1092391e43daSPeter Zijlstra raw_spin_lock_nested(&rq1->lock, SINGLE_DEPTH_NESTING); 1093391e43daSPeter Zijlstra } 1094391e43daSPeter Zijlstra } 1095391e43daSPeter Zijlstra } 1096391e43daSPeter Zijlstra 1097391e43daSPeter Zijlstra /* 1098391e43daSPeter Zijlstra * double_rq_unlock - safely unlock two runqueues 1099391e43daSPeter Zijlstra * 1100391e43daSPeter Zijlstra * Note this does not restore interrupts like task_rq_unlock, 1101391e43daSPeter Zijlstra * you need to do so manually after calling. 1102391e43daSPeter Zijlstra */ 1103391e43daSPeter Zijlstra static inline void double_rq_unlock(struct rq *rq1, struct rq *rq2) 1104391e43daSPeter Zijlstra __releases(rq1->lock) 1105391e43daSPeter Zijlstra __releases(rq2->lock) 1106391e43daSPeter Zijlstra { 1107391e43daSPeter Zijlstra raw_spin_unlock(&rq1->lock); 1108391e43daSPeter Zijlstra if (rq1 != rq2) 1109391e43daSPeter Zijlstra raw_spin_unlock(&rq2->lock); 1110391e43daSPeter Zijlstra else 1111391e43daSPeter Zijlstra __release(rq2->lock); 1112391e43daSPeter Zijlstra } 1113391e43daSPeter Zijlstra 1114391e43daSPeter Zijlstra #else /* CONFIG_SMP */ 1115391e43daSPeter Zijlstra 1116391e43daSPeter Zijlstra /* 1117391e43daSPeter Zijlstra * double_rq_lock - safely lock two runqueues 1118391e43daSPeter Zijlstra * 1119391e43daSPeter Zijlstra * Note this does not disable interrupts like task_rq_lock, 1120391e43daSPeter Zijlstra * you need to do so manually before calling. 1121391e43daSPeter Zijlstra */ 1122391e43daSPeter Zijlstra static inline void double_rq_lock(struct rq *rq1, struct rq *rq2) 1123391e43daSPeter Zijlstra __acquires(rq1->lock) 1124391e43daSPeter Zijlstra __acquires(rq2->lock) 1125391e43daSPeter Zijlstra { 1126391e43daSPeter Zijlstra BUG_ON(!irqs_disabled()); 1127391e43daSPeter Zijlstra BUG_ON(rq1 != rq2); 1128391e43daSPeter Zijlstra raw_spin_lock(&rq1->lock); 1129391e43daSPeter Zijlstra __acquire(rq2->lock); /* Fake it out ;) */ 1130391e43daSPeter Zijlstra } 1131391e43daSPeter Zijlstra 1132391e43daSPeter Zijlstra /* 1133391e43daSPeter Zijlstra * double_rq_unlock - safely unlock two runqueues 1134391e43daSPeter Zijlstra * 1135391e43daSPeter Zijlstra * Note this does not restore interrupts like task_rq_unlock, 1136391e43daSPeter Zijlstra * you need to do so manually after calling. 1137391e43daSPeter Zijlstra */ 1138391e43daSPeter Zijlstra static inline void double_rq_unlock(struct rq *rq1, struct rq *rq2) 1139391e43daSPeter Zijlstra __releases(rq1->lock) 1140391e43daSPeter Zijlstra __releases(rq2->lock) 1141391e43daSPeter Zijlstra { 1142391e43daSPeter Zijlstra BUG_ON(rq1 != rq2); 1143391e43daSPeter Zijlstra raw_spin_unlock(&rq1->lock); 1144391e43daSPeter Zijlstra __release(rq2->lock); 1145391e43daSPeter Zijlstra } 1146391e43daSPeter Zijlstra 1147391e43daSPeter Zijlstra #endif 1148391e43daSPeter Zijlstra 1149391e43daSPeter Zijlstra extern struct sched_entity *__pick_first_entity(struct cfs_rq *cfs_rq); 1150391e43daSPeter Zijlstra extern struct sched_entity *__pick_last_entity(struct cfs_rq *cfs_rq); 1151391e43daSPeter Zijlstra extern void print_cfs_stats(struct seq_file *m, int cpu); 1152391e43daSPeter Zijlstra extern void print_rt_stats(struct seq_file *m, int cpu); 1153391e43daSPeter Zijlstra 1154391e43daSPeter Zijlstra extern void init_cfs_rq(struct cfs_rq *cfs_rq); 1155391e43daSPeter Zijlstra extern void init_rt_rq(struct rt_rq *rt_rq, struct rq *rq); 1156391e43daSPeter Zijlstra 1157391e43daSPeter Zijlstra extern void account_cfs_bandwidth_used(int enabled, int was_enabled); 11581c792db7SSuresh Siddha 11591c792db7SSuresh Siddha #ifdef CONFIG_NO_HZ 11601c792db7SSuresh Siddha enum rq_nohz_flag_bits { 11611c792db7SSuresh Siddha NOHZ_TICK_STOPPED, 11621c792db7SSuresh Siddha NOHZ_BALANCE_KICK, 116369e1e811SSuresh Siddha NOHZ_IDLE, 11641c792db7SSuresh Siddha }; 11651c792db7SSuresh Siddha 11661c792db7SSuresh Siddha #define nohz_flags(cpu) (&cpu_rq(cpu)->nohz_flags) 11671c792db7SSuresh Siddha #endif 116873fbec60SFrederic Weisbecker 116973fbec60SFrederic Weisbecker #ifdef CONFIG_IRQ_TIME_ACCOUNTING 117073fbec60SFrederic Weisbecker 117173fbec60SFrederic Weisbecker DECLARE_PER_CPU(u64, cpu_hardirq_time); 117273fbec60SFrederic Weisbecker DECLARE_PER_CPU(u64, cpu_softirq_time); 117373fbec60SFrederic Weisbecker 117473fbec60SFrederic Weisbecker #ifndef CONFIG_64BIT 117573fbec60SFrederic Weisbecker DECLARE_PER_CPU(seqcount_t, irq_time_seq); 117673fbec60SFrederic Weisbecker 117773fbec60SFrederic Weisbecker static inline void irq_time_write_begin(void) 117873fbec60SFrederic Weisbecker { 117973fbec60SFrederic Weisbecker __this_cpu_inc(irq_time_seq.sequence); 118073fbec60SFrederic Weisbecker smp_wmb(); 118173fbec60SFrederic Weisbecker } 118273fbec60SFrederic Weisbecker 118373fbec60SFrederic Weisbecker static inline void irq_time_write_end(void) 118473fbec60SFrederic Weisbecker { 118573fbec60SFrederic Weisbecker smp_wmb(); 118673fbec60SFrederic Weisbecker __this_cpu_inc(irq_time_seq.sequence); 118773fbec60SFrederic Weisbecker } 118873fbec60SFrederic Weisbecker 118973fbec60SFrederic Weisbecker static inline u64 irq_time_read(int cpu) 119073fbec60SFrederic Weisbecker { 119173fbec60SFrederic Weisbecker u64 irq_time; 119273fbec60SFrederic Weisbecker unsigned seq; 119373fbec60SFrederic Weisbecker 119473fbec60SFrederic Weisbecker do { 119573fbec60SFrederic Weisbecker seq = read_seqcount_begin(&per_cpu(irq_time_seq, cpu)); 119673fbec60SFrederic Weisbecker irq_time = per_cpu(cpu_softirq_time, cpu) + 119773fbec60SFrederic Weisbecker per_cpu(cpu_hardirq_time, cpu); 119873fbec60SFrederic Weisbecker } while (read_seqcount_retry(&per_cpu(irq_time_seq, cpu), seq)); 119973fbec60SFrederic Weisbecker 120073fbec60SFrederic Weisbecker return irq_time; 120173fbec60SFrederic Weisbecker } 120273fbec60SFrederic Weisbecker #else /* CONFIG_64BIT */ 120373fbec60SFrederic Weisbecker static inline void irq_time_write_begin(void) 120473fbec60SFrederic Weisbecker { 120573fbec60SFrederic Weisbecker } 120673fbec60SFrederic Weisbecker 120773fbec60SFrederic Weisbecker static inline void irq_time_write_end(void) 120873fbec60SFrederic Weisbecker { 120973fbec60SFrederic Weisbecker } 121073fbec60SFrederic Weisbecker 121173fbec60SFrederic Weisbecker static inline u64 irq_time_read(int cpu) 121273fbec60SFrederic Weisbecker { 121373fbec60SFrederic Weisbecker return per_cpu(cpu_softirq_time, cpu) + per_cpu(cpu_hardirq_time, cpu); 121473fbec60SFrederic Weisbecker } 121573fbec60SFrederic Weisbecker #endif /* CONFIG_64BIT */ 121673fbec60SFrederic Weisbecker #endif /* CONFIG_IRQ_TIME_ACCOUNTING */ 121773fbec60SFrederic Weisbecker 1218