1b2441318SGreg Kroah-Hartman /* SPDX-License-Identifier: GPL-2.0 */ 2391e43daSPeter Zijlstra 3391e43daSPeter Zijlstra #include <linux/sched.h> 4dfc3401aSIngo Molnar #include <linux/sched/autogroup.h> 5cf4aebc2SClark Williams #include <linux/sched/sysctl.h> 6105ab3d8SIngo Molnar #include <linux/sched/topology.h> 78bd75c77SClark Williams #include <linux/sched/rt.h> 8ef8bd77fSIngo Molnar #include <linux/sched/deadline.h> 9e6017571SIngo Molnar #include <linux/sched/clock.h> 1084f001e1SIngo Molnar #include <linux/sched/wake_q.h> 113f07c014SIngo Molnar #include <linux/sched/signal.h> 126a3827d7SIngo Molnar #include <linux/sched/numa_balancing.h> 136e84f315SIngo Molnar #include <linux/sched/mm.h> 1455687da1SIngo Molnar #include <linux/sched/cpufreq.h> 1503441a34SIngo Molnar #include <linux/sched/stat.h> 16370c9135SIngo Molnar #include <linux/sched/nohz.h> 17b17b0153SIngo Molnar #include <linux/sched/debug.h> 18ef8bd77fSIngo Molnar #include <linux/sched/hotplug.h> 1929930025SIngo Molnar #include <linux/sched/task.h> 2068db0cf1SIngo Molnar #include <linux/sched/task_stack.h> 2132ef5517SIngo Molnar #include <linux/sched/cputime.h> 221777e463SIngo Molnar #include <linux/sched/init.h> 23ef8bd77fSIngo Molnar 2419d23dbfSFrederic Weisbecker #include <linux/u64_stats_sync.h> 25a499a5a1SFrederic Weisbecker #include <linux/kernel_stat.h> 263866e845SSteven Rostedt (Red Hat) #include <linux/binfmts.h> 27391e43daSPeter Zijlstra #include <linux/mutex.h> 28391e43daSPeter Zijlstra #include <linux/spinlock.h> 29391e43daSPeter Zijlstra #include <linux/stop_machine.h> 30b6366f04SSteven Rostedt #include <linux/irq_work.h> 319f3660c2SFrederic Weisbecker #include <linux/tick.h> 32f809ca9aSMel Gorman #include <linux/slab.h> 33d2cc5ed6STejun Heo #include <linux/cgroup.h> 34391e43daSPeter Zijlstra 357fce777cSIngo Molnar #ifdef CONFIG_PARAVIRT 367fce777cSIngo Molnar #include <asm/paravirt.h> 377fce777cSIngo Molnar #endif 387fce777cSIngo Molnar 39391e43daSPeter Zijlstra #include "cpupri.h" 406bfd6d72SJuri Lelli #include "cpudeadline.h" 41391e43daSPeter Zijlstra 429148a3a1SPeter Zijlstra #ifdef CONFIG_SCHED_DEBUG 439148a3a1SPeter Zijlstra # define SCHED_WARN_ON(x) WARN_ONCE(x, #x) 449148a3a1SPeter Zijlstra #else 456d3aed3dSIngo Molnar # define SCHED_WARN_ON(x) ({ (void)(x), 0; }) 469148a3a1SPeter Zijlstra #endif 479148a3a1SPeter Zijlstra 4845ceebf7SPaul Gortmaker struct rq; 49442bf3aaSDaniel Lezcano struct cpuidle_state; 5045ceebf7SPaul Gortmaker 51da0c1e65SKirill Tkhai /* task_struct::on_rq states: */ 52da0c1e65SKirill Tkhai #define TASK_ON_RQ_QUEUED 1 53cca26e80SKirill Tkhai #define TASK_ON_RQ_MIGRATING 2 54da0c1e65SKirill Tkhai 55391e43daSPeter Zijlstra extern __read_mostly int scheduler_running; 56391e43daSPeter Zijlstra 5745ceebf7SPaul Gortmaker extern unsigned long calc_load_update; 5845ceebf7SPaul Gortmaker extern atomic_long_t calc_load_tasks; 5945ceebf7SPaul Gortmaker 603289bdb4SPeter Zijlstra extern void calc_global_load_tick(struct rq *this_rq); 61d60585c5SThomas Gleixner extern long calc_load_fold_active(struct rq *this_rq, long adjust); 623289bdb4SPeter Zijlstra 633289bdb4SPeter Zijlstra #ifdef CONFIG_SMP 64cee1afceSFrederic Weisbecker extern void cpu_load_update_active(struct rq *this_rq); 653289bdb4SPeter Zijlstra #else 66cee1afceSFrederic Weisbecker static inline void cpu_load_update_active(struct rq *this_rq) { } 673289bdb4SPeter Zijlstra #endif 6845ceebf7SPaul Gortmaker 69391e43daSPeter Zijlstra /* 70391e43daSPeter Zijlstra * Helpers for converting nanosecond timing to jiffy resolution 71391e43daSPeter Zijlstra */ 72391e43daSPeter Zijlstra #define NS_TO_JIFFIES(TIME) ((unsigned long)(TIME) / (NSEC_PER_SEC / HZ)) 73391e43daSPeter Zijlstra 74cc1f4b1fSLi Zefan /* 75cc1f4b1fSLi Zefan * Increase resolution of nice-level calculations for 64-bit architectures. 76cc1f4b1fSLi Zefan * The extra resolution improves shares distribution and load balancing of 77cc1f4b1fSLi Zefan * low-weight task groups (eg. nice +19 on an autogroup), deeper taskgroup 78cc1f4b1fSLi Zefan * hierarchies, especially on larger systems. This is not a user-visible change 79cc1f4b1fSLi Zefan * and does not change the user-interface for setting shares/weights. 80cc1f4b1fSLi Zefan * 81cc1f4b1fSLi Zefan * We increase resolution only if we have enough bits to allow this increased 822159197dSPeter Zijlstra * resolution (i.e. 64bit). The costs for increasing resolution when 32bit are 832159197dSPeter Zijlstra * pretty high and the returns do not justify the increased costs. 842159197dSPeter Zijlstra * 852159197dSPeter Zijlstra * Really only required when CONFIG_FAIR_GROUP_SCHED is also set, but to 862159197dSPeter Zijlstra * increase coverage and consistency always enable it on 64bit platforms. 87cc1f4b1fSLi Zefan */ 882159197dSPeter Zijlstra #ifdef CONFIG_64BIT 89172895e6SYuyang Du # define NICE_0_LOAD_SHIFT (SCHED_FIXEDPOINT_SHIFT + SCHED_FIXEDPOINT_SHIFT) 906ecdd749SYuyang Du # define scale_load(w) ((w) << SCHED_FIXEDPOINT_SHIFT) 916ecdd749SYuyang Du # define scale_load_down(w) ((w) >> SCHED_FIXEDPOINT_SHIFT) 92cc1f4b1fSLi Zefan #else 93172895e6SYuyang Du # define NICE_0_LOAD_SHIFT (SCHED_FIXEDPOINT_SHIFT) 94cc1f4b1fSLi Zefan # define scale_load(w) (w) 95cc1f4b1fSLi Zefan # define scale_load_down(w) (w) 96cc1f4b1fSLi Zefan #endif 97cc1f4b1fSLi Zefan 986ecdd749SYuyang Du /* 99172895e6SYuyang Du * Task weight (visible to users) and its load (invisible to users) have 100172895e6SYuyang Du * independent resolution, but they should be well calibrated. We use 101172895e6SYuyang Du * scale_load() and scale_load_down(w) to convert between them. The 102172895e6SYuyang Du * following must be true: 103172895e6SYuyang Du * 104172895e6SYuyang Du * scale_load(sched_prio_to_weight[USER_PRIO(NICE_TO_PRIO(0))]) == NICE_0_LOAD 105172895e6SYuyang Du * 1066ecdd749SYuyang Du */ 107172895e6SYuyang Du #define NICE_0_LOAD (1L << NICE_0_LOAD_SHIFT) 108391e43daSPeter Zijlstra 109391e43daSPeter Zijlstra /* 110332ac17eSDario Faggioli * Single value that decides SCHED_DEADLINE internal math precision. 111332ac17eSDario Faggioli * 10 -> just above 1us 112332ac17eSDario Faggioli * 9 -> just above 0.5us 113332ac17eSDario Faggioli */ 114332ac17eSDario Faggioli #define DL_SCALE (10) 115332ac17eSDario Faggioli 116332ac17eSDario Faggioli /* 117391e43daSPeter Zijlstra * These are the 'tuning knobs' of the scheduler: 118391e43daSPeter Zijlstra */ 119391e43daSPeter Zijlstra 120391e43daSPeter Zijlstra /* 121391e43daSPeter Zijlstra * single value that denotes runtime == period, ie unlimited time. 122391e43daSPeter Zijlstra */ 123391e43daSPeter Zijlstra #define RUNTIME_INF ((u64)~0ULL) 124391e43daSPeter Zijlstra 12520f9cd2aSHenrik Austad static inline int idle_policy(int policy) 12620f9cd2aSHenrik Austad { 12720f9cd2aSHenrik Austad return policy == SCHED_IDLE; 12820f9cd2aSHenrik Austad } 129d50dde5aSDario Faggioli static inline int fair_policy(int policy) 130d50dde5aSDario Faggioli { 131d50dde5aSDario Faggioli return policy == SCHED_NORMAL || policy == SCHED_BATCH; 132d50dde5aSDario Faggioli } 133d50dde5aSDario Faggioli 134391e43daSPeter Zijlstra static inline int rt_policy(int policy) 135391e43daSPeter Zijlstra { 136d50dde5aSDario Faggioli return policy == SCHED_FIFO || policy == SCHED_RR; 137391e43daSPeter Zijlstra } 138391e43daSPeter Zijlstra 139aab03e05SDario Faggioli static inline int dl_policy(int policy) 140aab03e05SDario Faggioli { 141aab03e05SDario Faggioli return policy == SCHED_DEADLINE; 142aab03e05SDario Faggioli } 14320f9cd2aSHenrik Austad static inline bool valid_policy(int policy) 14420f9cd2aSHenrik Austad { 14520f9cd2aSHenrik Austad return idle_policy(policy) || fair_policy(policy) || 14620f9cd2aSHenrik Austad rt_policy(policy) || dl_policy(policy); 14720f9cd2aSHenrik Austad } 148aab03e05SDario Faggioli 149391e43daSPeter Zijlstra static inline int task_has_rt_policy(struct task_struct *p) 150391e43daSPeter Zijlstra { 151391e43daSPeter Zijlstra return rt_policy(p->policy); 152391e43daSPeter Zijlstra } 153391e43daSPeter Zijlstra 154aab03e05SDario Faggioli static inline int task_has_dl_policy(struct task_struct *p) 155aab03e05SDario Faggioli { 156aab03e05SDario Faggioli return dl_policy(p->policy); 157aab03e05SDario Faggioli } 158aab03e05SDario Faggioli 1592d3d891dSDario Faggioli /* 160794a56ebSJuri Lelli * !! For sched_setattr_nocheck() (kernel) only !! 161794a56ebSJuri Lelli * 162794a56ebSJuri Lelli * This is actually gross. :( 163794a56ebSJuri Lelli * 164794a56ebSJuri Lelli * It is used to make schedutil kworker(s) higher priority than SCHED_DEADLINE 165794a56ebSJuri Lelli * tasks, but still be able to sleep. We need this on platforms that cannot 166794a56ebSJuri Lelli * atomically change clock frequency. Remove once fast switching will be 167794a56ebSJuri Lelli * available on such platforms. 168794a56ebSJuri Lelli * 169794a56ebSJuri Lelli * SUGOV stands for SchedUtil GOVernor. 170794a56ebSJuri Lelli */ 171794a56ebSJuri Lelli #define SCHED_FLAG_SUGOV 0x10000000 172794a56ebSJuri Lelli 173794a56ebSJuri Lelli static inline bool dl_entity_is_special(struct sched_dl_entity *dl_se) 174794a56ebSJuri Lelli { 175794a56ebSJuri Lelli #ifdef CONFIG_CPU_FREQ_GOV_SCHEDUTIL 176794a56ebSJuri Lelli return unlikely(dl_se->flags & SCHED_FLAG_SUGOV); 177794a56ebSJuri Lelli #else 178794a56ebSJuri Lelli return false; 179794a56ebSJuri Lelli #endif 180794a56ebSJuri Lelli } 181794a56ebSJuri Lelli 182794a56ebSJuri Lelli /* 1832d3d891dSDario Faggioli * Tells if entity @a should preempt entity @b. 1842d3d891dSDario Faggioli */ 185332ac17eSDario Faggioli static inline bool 186332ac17eSDario Faggioli dl_entity_preempt(struct sched_dl_entity *a, struct sched_dl_entity *b) 1872d3d891dSDario Faggioli { 188794a56ebSJuri Lelli return dl_entity_is_special(a) || 189794a56ebSJuri Lelli dl_time_before(a->deadline, b->deadline); 1902d3d891dSDario Faggioli } 1912d3d891dSDario Faggioli 192391e43daSPeter Zijlstra /* 193391e43daSPeter Zijlstra * This is the priority-queue data structure of the RT scheduling class: 194391e43daSPeter Zijlstra */ 195391e43daSPeter Zijlstra struct rt_prio_array { 196391e43daSPeter Zijlstra DECLARE_BITMAP(bitmap, MAX_RT_PRIO+1); /* include 1 bit for delimiter */ 197391e43daSPeter Zijlstra struct list_head queue[MAX_RT_PRIO]; 198391e43daSPeter Zijlstra }; 199391e43daSPeter Zijlstra 200391e43daSPeter Zijlstra struct rt_bandwidth { 201391e43daSPeter Zijlstra /* nests inside the rq lock: */ 202391e43daSPeter Zijlstra raw_spinlock_t rt_runtime_lock; 203391e43daSPeter Zijlstra ktime_t rt_period; 204391e43daSPeter Zijlstra u64 rt_runtime; 205391e43daSPeter Zijlstra struct hrtimer rt_period_timer; 2064cfafd30SPeter Zijlstra unsigned int rt_period_active; 207391e43daSPeter Zijlstra }; 208a5e7be3bSJuri Lelli 209a5e7be3bSJuri Lelli void __dl_clear_params(struct task_struct *p); 210a5e7be3bSJuri Lelli 211332ac17eSDario Faggioli /* 212332ac17eSDario Faggioli * To keep the bandwidth of -deadline tasks and groups under control 213332ac17eSDario Faggioli * we need some place where: 214332ac17eSDario Faggioli * - store the maximum -deadline bandwidth of the system (the group); 215332ac17eSDario Faggioli * - cache the fraction of that bandwidth that is currently allocated. 216332ac17eSDario Faggioli * 217332ac17eSDario Faggioli * This is all done in the data structure below. It is similar to the 218332ac17eSDario Faggioli * one used for RT-throttling (rt_bandwidth), with the main difference 219332ac17eSDario Faggioli * that, since here we are only interested in admission control, we 220332ac17eSDario Faggioli * do not decrease any runtime while the group "executes", neither we 221332ac17eSDario Faggioli * need a timer to replenish it. 222332ac17eSDario Faggioli * 223332ac17eSDario Faggioli * With respect to SMP, the bandwidth is given on a per-CPU basis, 224332ac17eSDario Faggioli * meaning that: 225332ac17eSDario Faggioli * - dl_bw (< 100%) is the bandwidth of the system (group) on each CPU; 226332ac17eSDario Faggioli * - dl_total_bw array contains, in the i-eth element, the currently 227332ac17eSDario Faggioli * allocated bandwidth on the i-eth CPU. 228332ac17eSDario Faggioli * Moreover, groups consume bandwidth on each CPU, while tasks only 229332ac17eSDario Faggioli * consume bandwidth on the CPU they're running on. 230332ac17eSDario Faggioli * Finally, dl_total_bw_cpu is used to cache the index of dl_total_bw 231332ac17eSDario Faggioli * that will be shown the next time the proc or cgroup controls will 232332ac17eSDario Faggioli * be red. It on its turn can be changed by writing on its own 233332ac17eSDario Faggioli * control. 234332ac17eSDario Faggioli */ 235332ac17eSDario Faggioli struct dl_bandwidth { 236332ac17eSDario Faggioli raw_spinlock_t dl_runtime_lock; 237332ac17eSDario Faggioli u64 dl_runtime; 238332ac17eSDario Faggioli u64 dl_period; 239332ac17eSDario Faggioli }; 240332ac17eSDario Faggioli 241332ac17eSDario Faggioli static inline int dl_bandwidth_enabled(void) 242332ac17eSDario Faggioli { 2431724813dSPeter Zijlstra return sysctl_sched_rt_runtime >= 0; 244332ac17eSDario Faggioli } 245332ac17eSDario Faggioli 246332ac17eSDario Faggioli struct dl_bw { 247332ac17eSDario Faggioli raw_spinlock_t lock; 248332ac17eSDario Faggioli u64 bw, total_bw; 249332ac17eSDario Faggioli }; 250332ac17eSDario Faggioli 251daec5798SLuca Abeni static inline void __dl_update(struct dl_bw *dl_b, s64 bw); 252daec5798SLuca Abeni 2537f51412aSJuri Lelli static inline 2548c0944ceSPeter Zijlstra void __dl_sub(struct dl_bw *dl_b, u64 tsk_bw, int cpus) 2557f51412aSJuri Lelli { 2567f51412aSJuri Lelli dl_b->total_bw -= tsk_bw; 257daec5798SLuca Abeni __dl_update(dl_b, (s32)tsk_bw / cpus); 2587f51412aSJuri Lelli } 2597f51412aSJuri Lelli 2607f51412aSJuri Lelli static inline 261daec5798SLuca Abeni void __dl_add(struct dl_bw *dl_b, u64 tsk_bw, int cpus) 2627f51412aSJuri Lelli { 2637f51412aSJuri Lelli dl_b->total_bw += tsk_bw; 264daec5798SLuca Abeni __dl_update(dl_b, -((s32)tsk_bw / cpus)); 2657f51412aSJuri Lelli } 2667f51412aSJuri Lelli 2677f51412aSJuri Lelli static inline 2687f51412aSJuri Lelli bool __dl_overflow(struct dl_bw *dl_b, int cpus, u64 old_bw, u64 new_bw) 2697f51412aSJuri Lelli { 2707f51412aSJuri Lelli return dl_b->bw != -1 && 2717f51412aSJuri Lelli dl_b->bw * cpus < dl_b->total_bw - old_bw + new_bw; 2727f51412aSJuri Lelli } 2737f51412aSJuri Lelli 274209a0cbdSLuca Abeni void dl_change_utilization(struct task_struct *p, u64 new_bw); 275f2cb1360SIngo Molnar extern void init_dl_bw(struct dl_bw *dl_b); 27606a76fe0SNicolas Pitre extern int sched_dl_global_validate(void); 27706a76fe0SNicolas Pitre extern void sched_dl_do_global(void); 27806a76fe0SNicolas Pitre extern int sched_dl_overflow(struct task_struct *p, int policy, 27906a76fe0SNicolas Pitre const struct sched_attr *attr); 28006a76fe0SNicolas Pitre extern void __setparam_dl(struct task_struct *p, const struct sched_attr *attr); 28106a76fe0SNicolas Pitre extern void __getparam_dl(struct task_struct *p, struct sched_attr *attr); 28206a76fe0SNicolas Pitre extern bool __checkparam_dl(const struct sched_attr *attr); 28306a76fe0SNicolas Pitre extern bool dl_param_changed(struct task_struct *p, const struct sched_attr *attr); 28406a76fe0SNicolas Pitre extern int dl_task_can_attach(struct task_struct *p, 28506a76fe0SNicolas Pitre const struct cpumask *cs_cpus_allowed); 28606a76fe0SNicolas Pitre extern int dl_cpuset_cpumask_can_shrink(const struct cpumask *cur, 28706a76fe0SNicolas Pitre const struct cpumask *trial); 28806a76fe0SNicolas Pitre extern bool dl_cpu_busy(unsigned int cpu); 289391e43daSPeter Zijlstra 290391e43daSPeter Zijlstra #ifdef CONFIG_CGROUP_SCHED 291391e43daSPeter Zijlstra 292391e43daSPeter Zijlstra #include <linux/cgroup.h> 293391e43daSPeter Zijlstra 294391e43daSPeter Zijlstra struct cfs_rq; 295391e43daSPeter Zijlstra struct rt_rq; 296391e43daSPeter Zijlstra 29735cf4e50SMike Galbraith extern struct list_head task_groups; 298391e43daSPeter Zijlstra 299391e43daSPeter Zijlstra struct cfs_bandwidth { 300391e43daSPeter Zijlstra #ifdef CONFIG_CFS_BANDWIDTH 301391e43daSPeter Zijlstra raw_spinlock_t lock; 302391e43daSPeter Zijlstra ktime_t period; 303391e43daSPeter Zijlstra u64 quota, runtime; 3049c58c79aSZhihui Zhang s64 hierarchical_quota; 305391e43daSPeter Zijlstra u64 runtime_expires; 306391e43daSPeter Zijlstra 3074cfafd30SPeter Zijlstra int idle, period_active; 308391e43daSPeter Zijlstra struct hrtimer period_timer, slack_timer; 309391e43daSPeter Zijlstra struct list_head throttled_cfs_rq; 310391e43daSPeter Zijlstra 311391e43daSPeter Zijlstra /* statistics */ 312391e43daSPeter Zijlstra int nr_periods, nr_throttled; 313391e43daSPeter Zijlstra u64 throttled_time; 314391e43daSPeter Zijlstra #endif 315391e43daSPeter Zijlstra }; 316391e43daSPeter Zijlstra 317391e43daSPeter Zijlstra /* task group related information */ 318391e43daSPeter Zijlstra struct task_group { 319391e43daSPeter Zijlstra struct cgroup_subsys_state css; 320391e43daSPeter Zijlstra 321391e43daSPeter Zijlstra #ifdef CONFIG_FAIR_GROUP_SCHED 322391e43daSPeter Zijlstra /* schedulable entities of this group on each cpu */ 323391e43daSPeter Zijlstra struct sched_entity **se; 324391e43daSPeter Zijlstra /* runqueue "owned" by this group on each cpu */ 325391e43daSPeter Zijlstra struct cfs_rq **cfs_rq; 326391e43daSPeter Zijlstra unsigned long shares; 327391e43daSPeter Zijlstra 328fa6bddebSAlex Shi #ifdef CONFIG_SMP 329b0367629SWaiman Long /* 330b0367629SWaiman Long * load_avg can be heavily contended at clock tick time, so put 331b0367629SWaiman Long * it in its own cacheline separated from the fields above which 332b0367629SWaiman Long * will also be accessed at each tick. 333b0367629SWaiman Long */ 334b0367629SWaiman Long atomic_long_t load_avg ____cacheline_aligned; 335391e43daSPeter Zijlstra #endif 336fa6bddebSAlex Shi #endif 337391e43daSPeter Zijlstra 338391e43daSPeter Zijlstra #ifdef CONFIG_RT_GROUP_SCHED 339391e43daSPeter Zijlstra struct sched_rt_entity **rt_se; 340391e43daSPeter Zijlstra struct rt_rq **rt_rq; 341391e43daSPeter Zijlstra 342391e43daSPeter Zijlstra struct rt_bandwidth rt_bandwidth; 343391e43daSPeter Zijlstra #endif 344391e43daSPeter Zijlstra 345391e43daSPeter Zijlstra struct rcu_head rcu; 346391e43daSPeter Zijlstra struct list_head list; 347391e43daSPeter Zijlstra 348391e43daSPeter Zijlstra struct task_group *parent; 349391e43daSPeter Zijlstra struct list_head siblings; 350391e43daSPeter Zijlstra struct list_head children; 351391e43daSPeter Zijlstra 352391e43daSPeter Zijlstra #ifdef CONFIG_SCHED_AUTOGROUP 353391e43daSPeter Zijlstra struct autogroup *autogroup; 354391e43daSPeter Zijlstra #endif 355391e43daSPeter Zijlstra 356391e43daSPeter Zijlstra struct cfs_bandwidth cfs_bandwidth; 357391e43daSPeter Zijlstra }; 358391e43daSPeter Zijlstra 359391e43daSPeter Zijlstra #ifdef CONFIG_FAIR_GROUP_SCHED 360391e43daSPeter Zijlstra #define ROOT_TASK_GROUP_LOAD NICE_0_LOAD 361391e43daSPeter Zijlstra 362391e43daSPeter Zijlstra /* 363391e43daSPeter Zijlstra * A weight of 0 or 1 can cause arithmetics problems. 364391e43daSPeter Zijlstra * A weight of a cfs_rq is the sum of weights of which entities 365391e43daSPeter Zijlstra * are queued on this cfs_rq, so a weight of a entity should not be 366391e43daSPeter Zijlstra * too large, so as the shares value of a task group. 367391e43daSPeter Zijlstra * (The default weight is 1024 - so there's no practical 368391e43daSPeter Zijlstra * limitation from this.) 369391e43daSPeter Zijlstra */ 370391e43daSPeter Zijlstra #define MIN_SHARES (1UL << 1) 371391e43daSPeter Zijlstra #define MAX_SHARES (1UL << 18) 372391e43daSPeter Zijlstra #endif 373391e43daSPeter Zijlstra 374391e43daSPeter Zijlstra typedef int (*tg_visitor)(struct task_group *, void *); 375391e43daSPeter Zijlstra 376391e43daSPeter Zijlstra extern int walk_tg_tree_from(struct task_group *from, 377391e43daSPeter Zijlstra tg_visitor down, tg_visitor up, void *data); 378391e43daSPeter Zijlstra 379391e43daSPeter Zijlstra /* 380391e43daSPeter Zijlstra * Iterate the full tree, calling @down when first entering a node and @up when 381391e43daSPeter Zijlstra * leaving it for the final time. 382391e43daSPeter Zijlstra * 383391e43daSPeter Zijlstra * Caller must hold rcu_lock or sufficient equivalent. 384391e43daSPeter Zijlstra */ 385391e43daSPeter Zijlstra static inline int walk_tg_tree(tg_visitor down, tg_visitor up, void *data) 386391e43daSPeter Zijlstra { 387391e43daSPeter Zijlstra return walk_tg_tree_from(&root_task_group, down, up, data); 388391e43daSPeter Zijlstra } 389391e43daSPeter Zijlstra 390391e43daSPeter Zijlstra extern int tg_nop(struct task_group *tg, void *data); 391391e43daSPeter Zijlstra 392391e43daSPeter Zijlstra extern void free_fair_sched_group(struct task_group *tg); 393391e43daSPeter Zijlstra extern int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent); 3948663e24dSPeter Zijlstra extern void online_fair_sched_group(struct task_group *tg); 3956fe1f348SPeter Zijlstra extern void unregister_fair_sched_group(struct task_group *tg); 396391e43daSPeter Zijlstra extern void init_tg_cfs_entry(struct task_group *tg, struct cfs_rq *cfs_rq, 397391e43daSPeter Zijlstra struct sched_entity *se, int cpu, 398391e43daSPeter Zijlstra struct sched_entity *parent); 399391e43daSPeter Zijlstra extern void init_cfs_bandwidth(struct cfs_bandwidth *cfs_b); 400391e43daSPeter Zijlstra 401391e43daSPeter Zijlstra extern void __refill_cfs_bandwidth_runtime(struct cfs_bandwidth *cfs_b); 40277a4d1a1SPeter Zijlstra extern void start_cfs_bandwidth(struct cfs_bandwidth *cfs_b); 403391e43daSPeter Zijlstra extern void unthrottle_cfs_rq(struct cfs_rq *cfs_rq); 404391e43daSPeter Zijlstra 405391e43daSPeter Zijlstra extern void free_rt_sched_group(struct task_group *tg); 406391e43daSPeter Zijlstra extern int alloc_rt_sched_group(struct task_group *tg, struct task_group *parent); 407391e43daSPeter Zijlstra extern void init_tg_rt_entry(struct task_group *tg, struct rt_rq *rt_rq, 408391e43daSPeter Zijlstra struct sched_rt_entity *rt_se, int cpu, 409391e43daSPeter Zijlstra struct sched_rt_entity *parent); 4108887cd99SNicolas Pitre extern int sched_group_set_rt_runtime(struct task_group *tg, long rt_runtime_us); 4118887cd99SNicolas Pitre extern int sched_group_set_rt_period(struct task_group *tg, u64 rt_period_us); 4128887cd99SNicolas Pitre extern long sched_group_rt_runtime(struct task_group *tg); 4138887cd99SNicolas Pitre extern long sched_group_rt_period(struct task_group *tg); 4148887cd99SNicolas Pitre extern int sched_rt_can_attach(struct task_group *tg, struct task_struct *tsk); 415391e43daSPeter Zijlstra 41625cc7da7SLi Zefan extern struct task_group *sched_create_group(struct task_group *parent); 41725cc7da7SLi Zefan extern void sched_online_group(struct task_group *tg, 41825cc7da7SLi Zefan struct task_group *parent); 41925cc7da7SLi Zefan extern void sched_destroy_group(struct task_group *tg); 42025cc7da7SLi Zefan extern void sched_offline_group(struct task_group *tg); 42125cc7da7SLi Zefan 42225cc7da7SLi Zefan extern void sched_move_task(struct task_struct *tsk); 42325cc7da7SLi Zefan 42425cc7da7SLi Zefan #ifdef CONFIG_FAIR_GROUP_SCHED 42525cc7da7SLi Zefan extern int sched_group_set_shares(struct task_group *tg, unsigned long shares); 426ad936d86SByungchul Park 427ad936d86SByungchul Park #ifdef CONFIG_SMP 428ad936d86SByungchul Park extern void set_task_rq_fair(struct sched_entity *se, 429ad936d86SByungchul Park struct cfs_rq *prev, struct cfs_rq *next); 430ad936d86SByungchul Park #else /* !CONFIG_SMP */ 431ad936d86SByungchul Park static inline void set_task_rq_fair(struct sched_entity *se, 432ad936d86SByungchul Park struct cfs_rq *prev, struct cfs_rq *next) { } 433ad936d86SByungchul Park #endif /* CONFIG_SMP */ 434ad936d86SByungchul Park #endif /* CONFIG_FAIR_GROUP_SCHED */ 43525cc7da7SLi Zefan 436391e43daSPeter Zijlstra #else /* CONFIG_CGROUP_SCHED */ 437391e43daSPeter Zijlstra 438391e43daSPeter Zijlstra struct cfs_bandwidth { }; 439391e43daSPeter Zijlstra 440391e43daSPeter Zijlstra #endif /* CONFIG_CGROUP_SCHED */ 441391e43daSPeter Zijlstra 442391e43daSPeter Zijlstra /* CFS-related fields in a runqueue */ 443391e43daSPeter Zijlstra struct cfs_rq { 444391e43daSPeter Zijlstra struct load_weight load; 4451ea6c46aSPeter Zijlstra unsigned long runnable_weight; 446c82513e5SPeter Zijlstra unsigned int nr_running, h_nr_running; 447391e43daSPeter Zijlstra 448391e43daSPeter Zijlstra u64 exec_clock; 449391e43daSPeter Zijlstra u64 min_vruntime; 450391e43daSPeter Zijlstra #ifndef CONFIG_64BIT 451391e43daSPeter Zijlstra u64 min_vruntime_copy; 452391e43daSPeter Zijlstra #endif 453391e43daSPeter Zijlstra 454bfb06889SDavidlohr Bueso struct rb_root_cached tasks_timeline; 455391e43daSPeter Zijlstra 456391e43daSPeter Zijlstra /* 457391e43daSPeter Zijlstra * 'curr' points to currently running entity on this cfs_rq. 458391e43daSPeter Zijlstra * It is set to NULL otherwise (i.e when none are currently running). 459391e43daSPeter Zijlstra */ 460391e43daSPeter Zijlstra struct sched_entity *curr, *next, *last, *skip; 461391e43daSPeter Zijlstra 462391e43daSPeter Zijlstra #ifdef CONFIG_SCHED_DEBUG 463391e43daSPeter Zijlstra unsigned int nr_spread_over; 464391e43daSPeter Zijlstra #endif 465391e43daSPeter Zijlstra 4662dac754eSPaul Turner #ifdef CONFIG_SMP 4672dac754eSPaul Turner /* 4689d89c257SYuyang Du * CFS load tracking 4692dac754eSPaul Turner */ 4709d89c257SYuyang Du struct sched_avg avg; 4712a2f5d4eSPeter Zijlstra #ifndef CONFIG_64BIT 4722a2f5d4eSPeter Zijlstra u64 load_last_update_time_copy; 4732a2f5d4eSPeter Zijlstra #endif 4742a2f5d4eSPeter Zijlstra struct { 4752a2f5d4eSPeter Zijlstra raw_spinlock_t lock ____cacheline_aligned; 4762a2f5d4eSPeter Zijlstra int nr; 4772a2f5d4eSPeter Zijlstra unsigned long load_avg; 4782a2f5d4eSPeter Zijlstra unsigned long util_avg; 4790e2d2aaaSPeter Zijlstra unsigned long runnable_sum; 4802a2f5d4eSPeter Zijlstra } removed; 481141965c7SAlex Shi 482c566e8e9SPaul Turner #ifdef CONFIG_FAIR_GROUP_SCHED 4830e2d2aaaSPeter Zijlstra unsigned long tg_load_avg_contrib; 4840e2d2aaaSPeter Zijlstra long propagate; 4850e2d2aaaSPeter Zijlstra long prop_runnable_sum; 4860e2d2aaaSPeter Zijlstra 48782958366SPaul Turner /* 48882958366SPaul Turner * h_load = weight * f(tg) 48982958366SPaul Turner * 49082958366SPaul Turner * Where f(tg) is the recursive weight fraction assigned to 49182958366SPaul Turner * this group. 49282958366SPaul Turner */ 49382958366SPaul Turner unsigned long h_load; 49468520796SVladimir Davydov u64 last_h_load_update; 49568520796SVladimir Davydov struct sched_entity *h_load_next; 49668520796SVladimir Davydov #endif /* CONFIG_FAIR_GROUP_SCHED */ 49782958366SPaul Turner #endif /* CONFIG_SMP */ 49882958366SPaul Turner 499391e43daSPeter Zijlstra #ifdef CONFIG_FAIR_GROUP_SCHED 500391e43daSPeter Zijlstra struct rq *rq; /* cpu runqueue to which this cfs_rq is attached */ 501391e43daSPeter Zijlstra 502391e43daSPeter Zijlstra /* 503391e43daSPeter Zijlstra * leaf cfs_rqs are those that hold tasks (lowest schedulable entity in 504391e43daSPeter Zijlstra * a hierarchy). Non-leaf lrqs hold other higher schedulable entities 505391e43daSPeter Zijlstra * (like users, containers etc.) 506391e43daSPeter Zijlstra * 507391e43daSPeter Zijlstra * leaf_cfs_rq_list ties together list of leaf cfs_rq's in a cpu. This 508391e43daSPeter Zijlstra * list is used during load balance. 509391e43daSPeter Zijlstra */ 510391e43daSPeter Zijlstra int on_list; 511391e43daSPeter Zijlstra struct list_head leaf_cfs_rq_list; 512391e43daSPeter Zijlstra struct task_group *tg; /* group that "owns" this runqueue */ 513391e43daSPeter Zijlstra 514391e43daSPeter Zijlstra #ifdef CONFIG_CFS_BANDWIDTH 515391e43daSPeter Zijlstra int runtime_enabled; 516391e43daSPeter Zijlstra u64 runtime_expires; 517391e43daSPeter Zijlstra s64 runtime_remaining; 518391e43daSPeter Zijlstra 519f1b17280SPaul Turner u64 throttled_clock, throttled_clock_task; 520f1b17280SPaul Turner u64 throttled_clock_task_time; 52155e16d30SPeter Zijlstra int throttled, throttle_count; 522391e43daSPeter Zijlstra struct list_head throttled_list; 523391e43daSPeter Zijlstra #endif /* CONFIG_CFS_BANDWIDTH */ 524391e43daSPeter Zijlstra #endif /* CONFIG_FAIR_GROUP_SCHED */ 525391e43daSPeter Zijlstra }; 526391e43daSPeter Zijlstra 527391e43daSPeter Zijlstra static inline int rt_bandwidth_enabled(void) 528391e43daSPeter Zijlstra { 529391e43daSPeter Zijlstra return sysctl_sched_rt_runtime >= 0; 530391e43daSPeter Zijlstra } 531391e43daSPeter Zijlstra 532b6366f04SSteven Rostedt /* RT IPI pull logic requires IRQ_WORK */ 5334bdced5cSSteven Rostedt (Red Hat) #if defined(CONFIG_IRQ_WORK) && defined(CONFIG_SMP) 534b6366f04SSteven Rostedt # define HAVE_RT_PUSH_IPI 535b6366f04SSteven Rostedt #endif 536b6366f04SSteven Rostedt 537391e43daSPeter Zijlstra /* Real-Time classes' related field in a runqueue: */ 538391e43daSPeter Zijlstra struct rt_rq { 539391e43daSPeter Zijlstra struct rt_prio_array active; 540c82513e5SPeter Zijlstra unsigned int rt_nr_running; 54101d36d0aSFrederic Weisbecker unsigned int rr_nr_running; 542391e43daSPeter Zijlstra #if defined CONFIG_SMP || defined CONFIG_RT_GROUP_SCHED 543391e43daSPeter Zijlstra struct { 544391e43daSPeter Zijlstra int curr; /* highest queued rt task prio */ 545391e43daSPeter Zijlstra #ifdef CONFIG_SMP 546391e43daSPeter Zijlstra int next; /* next highest */ 547391e43daSPeter Zijlstra #endif 548391e43daSPeter Zijlstra } highest_prio; 549391e43daSPeter Zijlstra #endif 550391e43daSPeter Zijlstra #ifdef CONFIG_SMP 551391e43daSPeter Zijlstra unsigned long rt_nr_migratory; 552391e43daSPeter Zijlstra unsigned long rt_nr_total; 553391e43daSPeter Zijlstra int overloaded; 554391e43daSPeter Zijlstra struct plist_head pushable_tasks; 555b6366f04SSteven Rostedt #endif /* CONFIG_SMP */ 556f4ebcbc0SKirill Tkhai int rt_queued; 557f4ebcbc0SKirill Tkhai 558391e43daSPeter Zijlstra int rt_throttled; 559391e43daSPeter Zijlstra u64 rt_time; 560391e43daSPeter Zijlstra u64 rt_runtime; 561391e43daSPeter Zijlstra /* Nests inside the rq lock: */ 562391e43daSPeter Zijlstra raw_spinlock_t rt_runtime_lock; 563391e43daSPeter Zijlstra 564391e43daSPeter Zijlstra #ifdef CONFIG_RT_GROUP_SCHED 565391e43daSPeter Zijlstra unsigned long rt_nr_boosted; 566391e43daSPeter Zijlstra 567391e43daSPeter Zijlstra struct rq *rq; 568391e43daSPeter Zijlstra struct task_group *tg; 569391e43daSPeter Zijlstra #endif 570391e43daSPeter Zijlstra }; 571391e43daSPeter Zijlstra 572aab03e05SDario Faggioli /* Deadline class' related fields in a runqueue */ 573aab03e05SDario Faggioli struct dl_rq { 574aab03e05SDario Faggioli /* runqueue is an rbtree, ordered by deadline */ 5752161573eSDavidlohr Bueso struct rb_root_cached root; 576aab03e05SDario Faggioli 577aab03e05SDario Faggioli unsigned long dl_nr_running; 5781baca4ceSJuri Lelli 5791baca4ceSJuri Lelli #ifdef CONFIG_SMP 5801baca4ceSJuri Lelli /* 5811baca4ceSJuri Lelli * Deadline values of the currently executing and the 5821baca4ceSJuri Lelli * earliest ready task on this rq. Caching these facilitates 5831baca4ceSJuri Lelli * the decision wether or not a ready but not running task 5841baca4ceSJuri Lelli * should migrate somewhere else. 5851baca4ceSJuri Lelli */ 5861baca4ceSJuri Lelli struct { 5871baca4ceSJuri Lelli u64 curr; 5881baca4ceSJuri Lelli u64 next; 5891baca4ceSJuri Lelli } earliest_dl; 5901baca4ceSJuri Lelli 5911baca4ceSJuri Lelli unsigned long dl_nr_migratory; 5921baca4ceSJuri Lelli int overloaded; 5931baca4ceSJuri Lelli 5941baca4ceSJuri Lelli /* 5951baca4ceSJuri Lelli * Tasks on this rq that can be pushed away. They are kept in 5961baca4ceSJuri Lelli * an rb-tree, ordered by tasks' deadlines, with caching 5971baca4ceSJuri Lelli * of the leftmost (earliest deadline) element. 5981baca4ceSJuri Lelli */ 5992161573eSDavidlohr Bueso struct rb_root_cached pushable_dl_tasks_root; 600332ac17eSDario Faggioli #else 601332ac17eSDario Faggioli struct dl_bw dl_bw; 6021baca4ceSJuri Lelli #endif 603e36d8677SLuca Abeni /* 604e36d8677SLuca Abeni * "Active utilization" for this runqueue: increased when a 605e36d8677SLuca Abeni * task wakes up (becomes TASK_RUNNING) and decreased when a 606e36d8677SLuca Abeni * task blocks 607e36d8677SLuca Abeni */ 608e36d8677SLuca Abeni u64 running_bw; 6094da3abceSLuca Abeni 6104da3abceSLuca Abeni /* 6118fd27231SLuca Abeni * Utilization of the tasks "assigned" to this runqueue (including 6128fd27231SLuca Abeni * the tasks that are in runqueue and the tasks that executed on this 6138fd27231SLuca Abeni * CPU and blocked). Increased when a task moves to this runqueue, and 6148fd27231SLuca Abeni * decreased when the task moves away (migrates, changes scheduling 6158fd27231SLuca Abeni * policy, or terminates). 6168fd27231SLuca Abeni * This is needed to compute the "inactive utilization" for the 6178fd27231SLuca Abeni * runqueue (inactive utilization = this_bw - running_bw). 6188fd27231SLuca Abeni */ 6198fd27231SLuca Abeni u64 this_bw; 620daec5798SLuca Abeni u64 extra_bw; 6218fd27231SLuca Abeni 6228fd27231SLuca Abeni /* 6234da3abceSLuca Abeni * Inverse of the fraction of CPU utilization that can be reclaimed 6244da3abceSLuca Abeni * by the GRUB algorithm. 6254da3abceSLuca Abeni */ 6264da3abceSLuca Abeni u64 bw_ratio; 627aab03e05SDario Faggioli }; 628aab03e05SDario Faggioli 629391e43daSPeter Zijlstra #ifdef CONFIG_SMP 630391e43daSPeter Zijlstra 631afe06efdSTim Chen static inline bool sched_asym_prefer(int a, int b) 632afe06efdSTim Chen { 633afe06efdSTim Chen return arch_asym_cpu_priority(a) > arch_asym_cpu_priority(b); 634afe06efdSTim Chen } 635afe06efdSTim Chen 636391e43daSPeter Zijlstra /* 637391e43daSPeter Zijlstra * We add the notion of a root-domain which will be used to define per-domain 638391e43daSPeter Zijlstra * variables. Each exclusive cpuset essentially defines an island domain by 639391e43daSPeter Zijlstra * fully partitioning the member cpus from any other cpuset. Whenever a new 640391e43daSPeter Zijlstra * exclusive cpuset is created, we also create and attach a new root-domain 641391e43daSPeter Zijlstra * object. 642391e43daSPeter Zijlstra * 643391e43daSPeter Zijlstra */ 644391e43daSPeter Zijlstra struct root_domain { 645391e43daSPeter Zijlstra atomic_t refcount; 646391e43daSPeter Zijlstra atomic_t rto_count; 647391e43daSPeter Zijlstra struct rcu_head rcu; 648391e43daSPeter Zijlstra cpumask_var_t span; 649391e43daSPeter Zijlstra cpumask_var_t online; 650391e43daSPeter Zijlstra 6514486edd1STim Chen /* Indicate more than one runnable task for any CPU */ 6524486edd1STim Chen bool overload; 6534486edd1STim Chen 654391e43daSPeter Zijlstra /* 6551baca4ceSJuri Lelli * The bit corresponding to a CPU gets set here if such CPU has more 6561baca4ceSJuri Lelli * than one runnable -deadline task (as it is below for RT tasks). 6571baca4ceSJuri Lelli */ 6581baca4ceSJuri Lelli cpumask_var_t dlo_mask; 6591baca4ceSJuri Lelli atomic_t dlo_count; 660332ac17eSDario Faggioli struct dl_bw dl_bw; 6616bfd6d72SJuri Lelli struct cpudl cpudl; 6621baca4ceSJuri Lelli 6634bdced5cSSteven Rostedt (Red Hat) #ifdef HAVE_RT_PUSH_IPI 6644bdced5cSSteven Rostedt (Red Hat) /* 6654bdced5cSSteven Rostedt (Red Hat) * For IPI pull requests, loop across the rto_mask. 6664bdced5cSSteven Rostedt (Red Hat) */ 6674bdced5cSSteven Rostedt (Red Hat) struct irq_work rto_push_work; 6684bdced5cSSteven Rostedt (Red Hat) raw_spinlock_t rto_lock; 6694bdced5cSSteven Rostedt (Red Hat) /* These are only updated and read within rto_lock */ 6704bdced5cSSteven Rostedt (Red Hat) int rto_loop; 6714bdced5cSSteven Rostedt (Red Hat) int rto_cpu; 6724bdced5cSSteven Rostedt (Red Hat) /* These atomics are updated outside of a lock */ 6734bdced5cSSteven Rostedt (Red Hat) atomic_t rto_loop_next; 6744bdced5cSSteven Rostedt (Red Hat) atomic_t rto_loop_start; 6754bdced5cSSteven Rostedt (Red Hat) #endif 6761baca4ceSJuri Lelli /* 677391e43daSPeter Zijlstra * The "RT overload" flag: it gets set if a CPU has more than 678391e43daSPeter Zijlstra * one runnable RT task. 679391e43daSPeter Zijlstra */ 680391e43daSPeter Zijlstra cpumask_var_t rto_mask; 681391e43daSPeter Zijlstra struct cpupri cpupri; 682cd92bfd3SDietmar Eggemann 683cd92bfd3SDietmar Eggemann unsigned long max_cpu_capacity; 684391e43daSPeter Zijlstra }; 685391e43daSPeter Zijlstra 686391e43daSPeter Zijlstra extern struct root_domain def_root_domain; 687f2cb1360SIngo Molnar extern struct mutex sched_domains_mutex; 688f2cb1360SIngo Molnar 689f2cb1360SIngo Molnar extern void init_defrootdomain(void); 6908d5dc512SPeter Zijlstra extern int sched_init_domains(const struct cpumask *cpu_map); 691f2cb1360SIngo Molnar extern void rq_attach_root(struct rq *rq, struct root_domain *rd); 692391e43daSPeter Zijlstra 6934bdced5cSSteven Rostedt (Red Hat) #ifdef HAVE_RT_PUSH_IPI 6944bdced5cSSteven Rostedt (Red Hat) extern void rto_push_irq_work_func(struct irq_work *work); 6954bdced5cSSteven Rostedt (Red Hat) #endif 696391e43daSPeter Zijlstra #endif /* CONFIG_SMP */ 697391e43daSPeter Zijlstra 698391e43daSPeter Zijlstra /* 699391e43daSPeter Zijlstra * This is the main, per-CPU runqueue data structure. 700391e43daSPeter Zijlstra * 701391e43daSPeter Zijlstra * Locking rule: those places that want to lock multiple runqueues 702391e43daSPeter Zijlstra * (such as the load balancing or the thread migration code), lock 703391e43daSPeter Zijlstra * acquire operations must be ordered by ascending &runqueue. 704391e43daSPeter Zijlstra */ 705391e43daSPeter Zijlstra struct rq { 706391e43daSPeter Zijlstra /* runqueue lock: */ 707391e43daSPeter Zijlstra raw_spinlock_t lock; 708391e43daSPeter Zijlstra 709391e43daSPeter Zijlstra /* 710391e43daSPeter Zijlstra * nr_running and cpu_load should be in the same cacheline because 711391e43daSPeter Zijlstra * remote CPUs use both these fields when doing load calculation. 712391e43daSPeter Zijlstra */ 713c82513e5SPeter Zijlstra unsigned int nr_running; 7140ec8aa00SPeter Zijlstra #ifdef CONFIG_NUMA_BALANCING 7150ec8aa00SPeter Zijlstra unsigned int nr_numa_running; 7160ec8aa00SPeter Zijlstra unsigned int nr_preferred_running; 7170ec8aa00SPeter Zijlstra #endif 718391e43daSPeter Zijlstra #define CPU_LOAD_IDX_MAX 5 719391e43daSPeter Zijlstra unsigned long cpu_load[CPU_LOAD_IDX_MAX]; 7203451d024SFrederic Weisbecker #ifdef CONFIG_NO_HZ_COMMON 7219fd81dd5SFrederic Weisbecker #ifdef CONFIG_SMP 7229fd81dd5SFrederic Weisbecker unsigned long last_load_update_tick; 7239fd81dd5SFrederic Weisbecker #endif /* CONFIG_SMP */ 7241c792db7SSuresh Siddha unsigned long nohz_flags; 7259fd81dd5SFrederic Weisbecker #endif /* CONFIG_NO_HZ_COMMON */ 726265f22a9SFrederic Weisbecker #ifdef CONFIG_NO_HZ_FULL 727265f22a9SFrederic Weisbecker unsigned long last_sched_tick; 728265f22a9SFrederic Weisbecker #endif 729391e43daSPeter Zijlstra /* capture load from *all* tasks on this cpu: */ 730391e43daSPeter Zijlstra struct load_weight load; 731391e43daSPeter Zijlstra unsigned long nr_load_updates; 732391e43daSPeter Zijlstra u64 nr_switches; 733391e43daSPeter Zijlstra 734391e43daSPeter Zijlstra struct cfs_rq cfs; 735391e43daSPeter Zijlstra struct rt_rq rt; 736aab03e05SDario Faggioli struct dl_rq dl; 737391e43daSPeter Zijlstra 738391e43daSPeter Zijlstra #ifdef CONFIG_FAIR_GROUP_SCHED 739391e43daSPeter Zijlstra /* list of leaf cfs_rq on this cpu: */ 740391e43daSPeter Zijlstra struct list_head leaf_cfs_rq_list; 7419c2791f9SVincent Guittot struct list_head *tmp_alone_branch; 742a35b6466SPeter Zijlstra #endif /* CONFIG_FAIR_GROUP_SCHED */ 743a35b6466SPeter Zijlstra 744391e43daSPeter Zijlstra /* 745391e43daSPeter Zijlstra * This is part of a global counter where only the total sum 746391e43daSPeter Zijlstra * over all CPUs matters. A task can increase this counter on 747391e43daSPeter Zijlstra * one CPU and if it got migrated afterwards it may decrease 748391e43daSPeter Zijlstra * it on another CPU. Always updated under the runqueue lock: 749391e43daSPeter Zijlstra */ 750391e43daSPeter Zijlstra unsigned long nr_uninterruptible; 751391e43daSPeter Zijlstra 752391e43daSPeter Zijlstra struct task_struct *curr, *idle, *stop; 753391e43daSPeter Zijlstra unsigned long next_balance; 754391e43daSPeter Zijlstra struct mm_struct *prev_mm; 755391e43daSPeter Zijlstra 756cb42c9a3SMatt Fleming unsigned int clock_update_flags; 757391e43daSPeter Zijlstra u64 clock; 758391e43daSPeter Zijlstra u64 clock_task; 759391e43daSPeter Zijlstra 760391e43daSPeter Zijlstra atomic_t nr_iowait; 761391e43daSPeter Zijlstra 762391e43daSPeter Zijlstra #ifdef CONFIG_SMP 763391e43daSPeter Zijlstra struct root_domain *rd; 764391e43daSPeter Zijlstra struct sched_domain *sd; 765391e43daSPeter Zijlstra 766ced549faSNicolas Pitre unsigned long cpu_capacity; 767ca6d75e6SVincent Guittot unsigned long cpu_capacity_orig; 768391e43daSPeter Zijlstra 769e3fca9e7SPeter Zijlstra struct callback_head *balance_callback; 770e3fca9e7SPeter Zijlstra 771391e43daSPeter Zijlstra unsigned char idle_balance; 772391e43daSPeter Zijlstra /* For active balancing */ 773391e43daSPeter Zijlstra int active_balance; 774391e43daSPeter Zijlstra int push_cpu; 775391e43daSPeter Zijlstra struct cpu_stop_work active_balance_work; 776391e43daSPeter Zijlstra /* cpu of this runqueue: */ 777391e43daSPeter Zijlstra int cpu; 778391e43daSPeter Zijlstra int online; 779391e43daSPeter Zijlstra 780367456c7SPeter Zijlstra struct list_head cfs_tasks; 781367456c7SPeter Zijlstra 782391e43daSPeter Zijlstra u64 rt_avg; 783391e43daSPeter Zijlstra u64 age_stamp; 784391e43daSPeter Zijlstra u64 idle_stamp; 785391e43daSPeter Zijlstra u64 avg_idle; 7869bd721c5SJason Low 7879bd721c5SJason Low /* This is used to determine avg_idle's max value */ 7889bd721c5SJason Low u64 max_idle_balance_cost; 789391e43daSPeter Zijlstra #endif 790391e43daSPeter Zijlstra 791391e43daSPeter Zijlstra #ifdef CONFIG_IRQ_TIME_ACCOUNTING 792391e43daSPeter Zijlstra u64 prev_irq_time; 793391e43daSPeter Zijlstra #endif 794391e43daSPeter Zijlstra #ifdef CONFIG_PARAVIRT 795391e43daSPeter Zijlstra u64 prev_steal_time; 796391e43daSPeter Zijlstra #endif 797391e43daSPeter Zijlstra #ifdef CONFIG_PARAVIRT_TIME_ACCOUNTING 798391e43daSPeter Zijlstra u64 prev_steal_time_rq; 799391e43daSPeter Zijlstra #endif 800391e43daSPeter Zijlstra 801391e43daSPeter Zijlstra /* calc_load related fields */ 802391e43daSPeter Zijlstra unsigned long calc_load_update; 803391e43daSPeter Zijlstra long calc_load_active; 804391e43daSPeter Zijlstra 805391e43daSPeter Zijlstra #ifdef CONFIG_SCHED_HRTICK 806391e43daSPeter Zijlstra #ifdef CONFIG_SMP 807391e43daSPeter Zijlstra int hrtick_csd_pending; 808966a9671SYing Huang call_single_data_t hrtick_csd; 809391e43daSPeter Zijlstra #endif 810391e43daSPeter Zijlstra struct hrtimer hrtick_timer; 811391e43daSPeter Zijlstra #endif 812391e43daSPeter Zijlstra 813391e43daSPeter Zijlstra #ifdef CONFIG_SCHEDSTATS 814391e43daSPeter Zijlstra /* latency stats */ 815391e43daSPeter Zijlstra struct sched_info rq_sched_info; 816391e43daSPeter Zijlstra unsigned long long rq_cpu_time; 817391e43daSPeter Zijlstra /* could above be rq->cfs_rq.exec_clock + rq->rt_rq.rt_runtime ? */ 818391e43daSPeter Zijlstra 819391e43daSPeter Zijlstra /* sys_sched_yield() stats */ 820391e43daSPeter Zijlstra unsigned int yld_count; 821391e43daSPeter Zijlstra 822391e43daSPeter Zijlstra /* schedule() stats */ 823391e43daSPeter Zijlstra unsigned int sched_count; 824391e43daSPeter Zijlstra unsigned int sched_goidle; 825391e43daSPeter Zijlstra 826391e43daSPeter Zijlstra /* try_to_wake_up() stats */ 827391e43daSPeter Zijlstra unsigned int ttwu_count; 828391e43daSPeter Zijlstra unsigned int ttwu_local; 829391e43daSPeter Zijlstra #endif 830391e43daSPeter Zijlstra 831391e43daSPeter Zijlstra #ifdef CONFIG_SMP 832391e43daSPeter Zijlstra struct llist_head wake_list; 833391e43daSPeter Zijlstra #endif 834442bf3aaSDaniel Lezcano 835442bf3aaSDaniel Lezcano #ifdef CONFIG_CPU_IDLE 836442bf3aaSDaniel Lezcano /* Must be inspected within a rcu lock section */ 837442bf3aaSDaniel Lezcano struct cpuidle_state *idle_state; 838442bf3aaSDaniel Lezcano #endif 839391e43daSPeter Zijlstra }; 840391e43daSPeter Zijlstra 841391e43daSPeter Zijlstra static inline int cpu_of(struct rq *rq) 842391e43daSPeter Zijlstra { 843391e43daSPeter Zijlstra #ifdef CONFIG_SMP 844391e43daSPeter Zijlstra return rq->cpu; 845391e43daSPeter Zijlstra #else 846391e43daSPeter Zijlstra return 0; 847391e43daSPeter Zijlstra #endif 848391e43daSPeter Zijlstra } 849391e43daSPeter Zijlstra 8501b568f0aSPeter Zijlstra 8511b568f0aSPeter Zijlstra #ifdef CONFIG_SCHED_SMT 8521b568f0aSPeter Zijlstra 8531b568f0aSPeter Zijlstra extern struct static_key_false sched_smt_present; 8541b568f0aSPeter Zijlstra 8551b568f0aSPeter Zijlstra extern void __update_idle_core(struct rq *rq); 8561b568f0aSPeter Zijlstra 8571b568f0aSPeter Zijlstra static inline void update_idle_core(struct rq *rq) 8581b568f0aSPeter Zijlstra { 8591b568f0aSPeter Zijlstra if (static_branch_unlikely(&sched_smt_present)) 8601b568f0aSPeter Zijlstra __update_idle_core(rq); 8611b568f0aSPeter Zijlstra } 8621b568f0aSPeter Zijlstra 8631b568f0aSPeter Zijlstra #else 8641b568f0aSPeter Zijlstra static inline void update_idle_core(struct rq *rq) { } 8651b568f0aSPeter Zijlstra #endif 8661b568f0aSPeter Zijlstra 8678b06c55bSPranith Kumar DECLARE_PER_CPU_SHARED_ALIGNED(struct rq, runqueues); 868391e43daSPeter Zijlstra 869518cd623SPeter Zijlstra #define cpu_rq(cpu) (&per_cpu(runqueues, (cpu))) 8704a32fea9SChristoph Lameter #define this_rq() this_cpu_ptr(&runqueues) 871518cd623SPeter Zijlstra #define task_rq(p) cpu_rq(task_cpu(p)) 872518cd623SPeter Zijlstra #define cpu_curr(cpu) (cpu_rq(cpu)->curr) 8734a32fea9SChristoph Lameter #define raw_rq() raw_cpu_ptr(&runqueues) 874518cd623SPeter Zijlstra 875cebde6d6SPeter Zijlstra static inline u64 __rq_clock_broken(struct rq *rq) 876cebde6d6SPeter Zijlstra { 877316c1608SJason Low return READ_ONCE(rq->clock); 878cebde6d6SPeter Zijlstra } 879cebde6d6SPeter Zijlstra 880cb42c9a3SMatt Fleming /* 881cb42c9a3SMatt Fleming * rq::clock_update_flags bits 882cb42c9a3SMatt Fleming * 883cb42c9a3SMatt Fleming * %RQCF_REQ_SKIP - will request skipping of clock update on the next 884cb42c9a3SMatt Fleming * call to __schedule(). This is an optimisation to avoid 885cb42c9a3SMatt Fleming * neighbouring rq clock updates. 886cb42c9a3SMatt Fleming * 887cb42c9a3SMatt Fleming * %RQCF_ACT_SKIP - is set from inside of __schedule() when skipping is 888cb42c9a3SMatt Fleming * in effect and calls to update_rq_clock() are being ignored. 889cb42c9a3SMatt Fleming * 890cb42c9a3SMatt Fleming * %RQCF_UPDATED - is a debug flag that indicates whether a call has been 891cb42c9a3SMatt Fleming * made to update_rq_clock() since the last time rq::lock was pinned. 892cb42c9a3SMatt Fleming * 893cb42c9a3SMatt Fleming * If inside of __schedule(), clock_update_flags will have been 894cb42c9a3SMatt Fleming * shifted left (a left shift is a cheap operation for the fast path 895cb42c9a3SMatt Fleming * to promote %RQCF_REQ_SKIP to %RQCF_ACT_SKIP), so you must use, 896cb42c9a3SMatt Fleming * 897cb42c9a3SMatt Fleming * if (rq-clock_update_flags >= RQCF_UPDATED) 898cb42c9a3SMatt Fleming * 899cb42c9a3SMatt Fleming * to check if %RQCF_UPADTED is set. It'll never be shifted more than 900cb42c9a3SMatt Fleming * one position though, because the next rq_unpin_lock() will shift it 901cb42c9a3SMatt Fleming * back. 902cb42c9a3SMatt Fleming */ 903cb42c9a3SMatt Fleming #define RQCF_REQ_SKIP 0x01 904cb42c9a3SMatt Fleming #define RQCF_ACT_SKIP 0x02 905cb42c9a3SMatt Fleming #define RQCF_UPDATED 0x04 906cb42c9a3SMatt Fleming 907cb42c9a3SMatt Fleming static inline void assert_clock_updated(struct rq *rq) 908cb42c9a3SMatt Fleming { 909cb42c9a3SMatt Fleming /* 910cb42c9a3SMatt Fleming * The only reason for not seeing a clock update since the 911cb42c9a3SMatt Fleming * last rq_pin_lock() is if we're currently skipping updates. 912cb42c9a3SMatt Fleming */ 913cb42c9a3SMatt Fleming SCHED_WARN_ON(rq->clock_update_flags < RQCF_ACT_SKIP); 914cb42c9a3SMatt Fleming } 915cb42c9a3SMatt Fleming 91678becc27SFrederic Weisbecker static inline u64 rq_clock(struct rq *rq) 91778becc27SFrederic Weisbecker { 918cebde6d6SPeter Zijlstra lockdep_assert_held(&rq->lock); 919cb42c9a3SMatt Fleming assert_clock_updated(rq); 920cb42c9a3SMatt Fleming 92178becc27SFrederic Weisbecker return rq->clock; 92278becc27SFrederic Weisbecker } 92378becc27SFrederic Weisbecker 92478becc27SFrederic Weisbecker static inline u64 rq_clock_task(struct rq *rq) 92578becc27SFrederic Weisbecker { 926cebde6d6SPeter Zijlstra lockdep_assert_held(&rq->lock); 927cb42c9a3SMatt Fleming assert_clock_updated(rq); 928cb42c9a3SMatt Fleming 92978becc27SFrederic Weisbecker return rq->clock_task; 93078becc27SFrederic Weisbecker } 93178becc27SFrederic Weisbecker 9329edfbfedSPeter Zijlstra static inline void rq_clock_skip_update(struct rq *rq, bool skip) 9339edfbfedSPeter Zijlstra { 9349edfbfedSPeter Zijlstra lockdep_assert_held(&rq->lock); 9359edfbfedSPeter Zijlstra if (skip) 936cb42c9a3SMatt Fleming rq->clock_update_flags |= RQCF_REQ_SKIP; 9379edfbfedSPeter Zijlstra else 938cb42c9a3SMatt Fleming rq->clock_update_flags &= ~RQCF_REQ_SKIP; 9399edfbfedSPeter Zijlstra } 9409edfbfedSPeter Zijlstra 941d8ac8971SMatt Fleming struct rq_flags { 942d8ac8971SMatt Fleming unsigned long flags; 943d8ac8971SMatt Fleming struct pin_cookie cookie; 944cb42c9a3SMatt Fleming #ifdef CONFIG_SCHED_DEBUG 945cb42c9a3SMatt Fleming /* 946cb42c9a3SMatt Fleming * A copy of (rq::clock_update_flags & RQCF_UPDATED) for the 947cb42c9a3SMatt Fleming * current pin context is stashed here in case it needs to be 948cb42c9a3SMatt Fleming * restored in rq_repin_lock(). 949cb42c9a3SMatt Fleming */ 950cb42c9a3SMatt Fleming unsigned int clock_update_flags; 951cb42c9a3SMatt Fleming #endif 952d8ac8971SMatt Fleming }; 953d8ac8971SMatt Fleming 954d8ac8971SMatt Fleming static inline void rq_pin_lock(struct rq *rq, struct rq_flags *rf) 955d8ac8971SMatt Fleming { 956d8ac8971SMatt Fleming rf->cookie = lockdep_pin_lock(&rq->lock); 957cb42c9a3SMatt Fleming 958cb42c9a3SMatt Fleming #ifdef CONFIG_SCHED_DEBUG 959cb42c9a3SMatt Fleming rq->clock_update_flags &= (RQCF_REQ_SKIP|RQCF_ACT_SKIP); 960cb42c9a3SMatt Fleming rf->clock_update_flags = 0; 961cb42c9a3SMatt Fleming #endif 962d8ac8971SMatt Fleming } 963d8ac8971SMatt Fleming 964d8ac8971SMatt Fleming static inline void rq_unpin_lock(struct rq *rq, struct rq_flags *rf) 965d8ac8971SMatt Fleming { 966cb42c9a3SMatt Fleming #ifdef CONFIG_SCHED_DEBUG 967cb42c9a3SMatt Fleming if (rq->clock_update_flags > RQCF_ACT_SKIP) 968cb42c9a3SMatt Fleming rf->clock_update_flags = RQCF_UPDATED; 969cb42c9a3SMatt Fleming #endif 970cb42c9a3SMatt Fleming 971d8ac8971SMatt Fleming lockdep_unpin_lock(&rq->lock, rf->cookie); 972d8ac8971SMatt Fleming } 973d8ac8971SMatt Fleming 974d8ac8971SMatt Fleming static inline void rq_repin_lock(struct rq *rq, struct rq_flags *rf) 975d8ac8971SMatt Fleming { 976d8ac8971SMatt Fleming lockdep_repin_lock(&rq->lock, rf->cookie); 977cb42c9a3SMatt Fleming 978cb42c9a3SMatt Fleming #ifdef CONFIG_SCHED_DEBUG 979cb42c9a3SMatt Fleming /* 980cb42c9a3SMatt Fleming * Restore the value we stashed in @rf for this pin context. 981cb42c9a3SMatt Fleming */ 982cb42c9a3SMatt Fleming rq->clock_update_flags |= rf->clock_update_flags; 983cb42c9a3SMatt Fleming #endif 984d8ac8971SMatt Fleming } 985d8ac8971SMatt Fleming 9869942f79bSRik van Riel #ifdef CONFIG_NUMA 987e3fe70b1SRik van Riel enum numa_topology_type { 988e3fe70b1SRik van Riel NUMA_DIRECT, 989e3fe70b1SRik van Riel NUMA_GLUELESS_MESH, 990e3fe70b1SRik van Riel NUMA_BACKPLANE, 991e3fe70b1SRik van Riel }; 992e3fe70b1SRik van Riel extern enum numa_topology_type sched_numa_topology_type; 9939942f79bSRik van Riel extern int sched_max_numa_distance; 9949942f79bSRik van Riel extern bool find_numa_distance(int distance); 9959942f79bSRik van Riel #endif 9969942f79bSRik van Riel 997f2cb1360SIngo Molnar #ifdef CONFIG_NUMA 998f2cb1360SIngo Molnar extern void sched_init_numa(void); 999f2cb1360SIngo Molnar extern void sched_domains_numa_masks_set(unsigned int cpu); 1000f2cb1360SIngo Molnar extern void sched_domains_numa_masks_clear(unsigned int cpu); 1001f2cb1360SIngo Molnar #else 1002f2cb1360SIngo Molnar static inline void sched_init_numa(void) { } 1003f2cb1360SIngo Molnar static inline void sched_domains_numa_masks_set(unsigned int cpu) { } 1004f2cb1360SIngo Molnar static inline void sched_domains_numa_masks_clear(unsigned int cpu) { } 1005f2cb1360SIngo Molnar #endif 1006f2cb1360SIngo Molnar 1007f809ca9aSMel Gorman #ifdef CONFIG_NUMA_BALANCING 100844dba3d5SIulia Manda /* The regions in numa_faults array from task_struct */ 100944dba3d5SIulia Manda enum numa_faults_stats { 101044dba3d5SIulia Manda NUMA_MEM = 0, 101144dba3d5SIulia Manda NUMA_CPU, 101244dba3d5SIulia Manda NUMA_MEMBUF, 101344dba3d5SIulia Manda NUMA_CPUBUF 101444dba3d5SIulia Manda }; 10150ec8aa00SPeter Zijlstra extern void sched_setnuma(struct task_struct *p, int node); 1016e6628d5bSMel Gorman extern int migrate_task_to(struct task_struct *p, int cpu); 1017ac66f547SPeter Zijlstra extern int migrate_swap(struct task_struct *, struct task_struct *); 1018f809ca9aSMel Gorman #endif /* CONFIG_NUMA_BALANCING */ 1019f809ca9aSMel Gorman 1020518cd623SPeter Zijlstra #ifdef CONFIG_SMP 1021518cd623SPeter Zijlstra 1022e3fca9e7SPeter Zijlstra static inline void 1023e3fca9e7SPeter Zijlstra queue_balance_callback(struct rq *rq, 1024e3fca9e7SPeter Zijlstra struct callback_head *head, 1025e3fca9e7SPeter Zijlstra void (*func)(struct rq *rq)) 1026e3fca9e7SPeter Zijlstra { 1027e3fca9e7SPeter Zijlstra lockdep_assert_held(&rq->lock); 1028e3fca9e7SPeter Zijlstra 1029e3fca9e7SPeter Zijlstra if (unlikely(head->next)) 1030e3fca9e7SPeter Zijlstra return; 1031e3fca9e7SPeter Zijlstra 1032e3fca9e7SPeter Zijlstra head->func = (void (*)(struct callback_head *))func; 1033e3fca9e7SPeter Zijlstra head->next = rq->balance_callback; 1034e3fca9e7SPeter Zijlstra rq->balance_callback = head; 1035e3fca9e7SPeter Zijlstra } 1036e3fca9e7SPeter Zijlstra 1037e3baac47SPeter Zijlstra extern void sched_ttwu_pending(void); 1038e3baac47SPeter Zijlstra 1039391e43daSPeter Zijlstra #define rcu_dereference_check_sched_domain(p) \ 1040391e43daSPeter Zijlstra rcu_dereference_check((p), \ 1041391e43daSPeter Zijlstra lockdep_is_held(&sched_domains_mutex)) 1042391e43daSPeter Zijlstra 1043391e43daSPeter Zijlstra /* 1044391e43daSPeter Zijlstra * The domain tree (rq->sd) is protected by RCU's quiescent state transition. 1045391e43daSPeter Zijlstra * See detach_destroy_domains: synchronize_sched for details. 1046391e43daSPeter Zijlstra * 1047391e43daSPeter Zijlstra * The domain tree of any CPU may only be accessed from within 1048391e43daSPeter Zijlstra * preempt-disabled sections. 1049391e43daSPeter Zijlstra */ 1050391e43daSPeter Zijlstra #define for_each_domain(cpu, __sd) \ 1051518cd623SPeter Zijlstra for (__sd = rcu_dereference_check_sched_domain(cpu_rq(cpu)->sd); \ 1052518cd623SPeter Zijlstra __sd; __sd = __sd->parent) 1053391e43daSPeter Zijlstra 105477e81365SSuresh Siddha #define for_each_lower_domain(sd) for (; sd; sd = sd->child) 105577e81365SSuresh Siddha 1056518cd623SPeter Zijlstra /** 1057518cd623SPeter Zijlstra * highest_flag_domain - Return highest sched_domain containing flag. 1058518cd623SPeter Zijlstra * @cpu: The cpu whose highest level of sched domain is to 1059518cd623SPeter Zijlstra * be returned. 1060518cd623SPeter Zijlstra * @flag: The flag to check for the highest sched_domain 1061518cd623SPeter Zijlstra * for the given cpu. 1062518cd623SPeter Zijlstra * 1063518cd623SPeter Zijlstra * Returns the highest sched_domain of a cpu which contains the given flag. 1064518cd623SPeter Zijlstra */ 1065518cd623SPeter Zijlstra static inline struct sched_domain *highest_flag_domain(int cpu, int flag) 1066518cd623SPeter Zijlstra { 1067518cd623SPeter Zijlstra struct sched_domain *sd, *hsd = NULL; 1068518cd623SPeter Zijlstra 1069518cd623SPeter Zijlstra for_each_domain(cpu, sd) { 1070518cd623SPeter Zijlstra if (!(sd->flags & flag)) 1071518cd623SPeter Zijlstra break; 1072518cd623SPeter Zijlstra hsd = sd; 1073518cd623SPeter Zijlstra } 1074518cd623SPeter Zijlstra 1075518cd623SPeter Zijlstra return hsd; 1076518cd623SPeter Zijlstra } 1077518cd623SPeter Zijlstra 1078fb13c7eeSMel Gorman static inline struct sched_domain *lowest_flag_domain(int cpu, int flag) 1079fb13c7eeSMel Gorman { 1080fb13c7eeSMel Gorman struct sched_domain *sd; 1081fb13c7eeSMel Gorman 1082fb13c7eeSMel Gorman for_each_domain(cpu, sd) { 1083fb13c7eeSMel Gorman if (sd->flags & flag) 1084fb13c7eeSMel Gorman break; 1085fb13c7eeSMel Gorman } 1086fb13c7eeSMel Gorman 1087fb13c7eeSMel Gorman return sd; 1088fb13c7eeSMel Gorman } 1089fb13c7eeSMel Gorman 1090518cd623SPeter Zijlstra DECLARE_PER_CPU(struct sched_domain *, sd_llc); 10917d9ffa89SPeter Zijlstra DECLARE_PER_CPU(int, sd_llc_size); 1092518cd623SPeter Zijlstra DECLARE_PER_CPU(int, sd_llc_id); 10930e369d75SPeter Zijlstra DECLARE_PER_CPU(struct sched_domain_shared *, sd_llc_shared); 1094fb13c7eeSMel Gorman DECLARE_PER_CPU(struct sched_domain *, sd_numa); 109537dc6b50SPreeti U Murthy DECLARE_PER_CPU(struct sched_domain *, sd_asym); 1096518cd623SPeter Zijlstra 109763b2ca30SNicolas Pitre struct sched_group_capacity { 10985e6521eaSLi Zefan atomic_t ref; 10995e6521eaSLi Zefan /* 1100172895e6SYuyang Du * CPU capacity of this group, SCHED_CAPACITY_SCALE being max capacity 110163b2ca30SNicolas Pitre * for a single CPU. 11025e6521eaSLi Zefan */ 1103bf475ce0SMorten Rasmussen unsigned long capacity; 1104bf475ce0SMorten Rasmussen unsigned long min_capacity; /* Min per-CPU capacity in group */ 11055e6521eaSLi Zefan unsigned long next_update; 110663b2ca30SNicolas Pitre int imbalance; /* XXX unrelated to capacity but shared group state */ 11075e6521eaSLi Zefan 1108005f874dSPeter Zijlstra #ifdef CONFIG_SCHED_DEBUG 1109005f874dSPeter Zijlstra int id; 1110005f874dSPeter Zijlstra #endif 1111005f874dSPeter Zijlstra 1112e5c14b1fSPeter Zijlstra unsigned long cpumask[0]; /* balance mask */ 11135e6521eaSLi Zefan }; 11145e6521eaSLi Zefan 11155e6521eaSLi Zefan struct sched_group { 11165e6521eaSLi Zefan struct sched_group *next; /* Must be a circular list */ 11175e6521eaSLi Zefan atomic_t ref; 11185e6521eaSLi Zefan 11195e6521eaSLi Zefan unsigned int group_weight; 112063b2ca30SNicolas Pitre struct sched_group_capacity *sgc; 1121afe06efdSTim Chen int asym_prefer_cpu; /* cpu of highest priority in group */ 11225e6521eaSLi Zefan 11235e6521eaSLi Zefan /* 11245e6521eaSLi Zefan * The CPUs this group covers. 11255e6521eaSLi Zefan * 11265e6521eaSLi Zefan * NOTE: this field is variable length. (Allocated dynamically 11275e6521eaSLi Zefan * by attaching extra space to the end of the structure, 11285e6521eaSLi Zefan * depending on how many CPUs the kernel has booted up with) 11295e6521eaSLi Zefan */ 11305e6521eaSLi Zefan unsigned long cpumask[0]; 11315e6521eaSLi Zefan }; 11325e6521eaSLi Zefan 1133ae4df9d6SPeter Zijlstra static inline struct cpumask *sched_group_span(struct sched_group *sg) 11345e6521eaSLi Zefan { 11355e6521eaSLi Zefan return to_cpumask(sg->cpumask); 11365e6521eaSLi Zefan } 11375e6521eaSLi Zefan 11385e6521eaSLi Zefan /* 1139e5c14b1fSPeter Zijlstra * See build_balance_mask(). 11405e6521eaSLi Zefan */ 1141e5c14b1fSPeter Zijlstra static inline struct cpumask *group_balance_mask(struct sched_group *sg) 11425e6521eaSLi Zefan { 114363b2ca30SNicolas Pitre return to_cpumask(sg->sgc->cpumask); 11445e6521eaSLi Zefan } 11455e6521eaSLi Zefan 11465e6521eaSLi Zefan /** 11475e6521eaSLi Zefan * group_first_cpu - Returns the first cpu in the cpumask of a sched_group. 11485e6521eaSLi Zefan * @group: The group whose first cpu is to be returned. 11495e6521eaSLi Zefan */ 11505e6521eaSLi Zefan static inline unsigned int group_first_cpu(struct sched_group *group) 11515e6521eaSLi Zefan { 1152ae4df9d6SPeter Zijlstra return cpumask_first(sched_group_span(group)); 11535e6521eaSLi Zefan } 11545e6521eaSLi Zefan 1155c1174876SPeter Zijlstra extern int group_balance_cpu(struct sched_group *sg); 1156c1174876SPeter Zijlstra 11573866e845SSteven Rostedt (Red Hat) #if defined(CONFIG_SCHED_DEBUG) && defined(CONFIG_SYSCTL) 11583866e845SSteven Rostedt (Red Hat) void register_sched_domain_sysctl(void); 1159bbdacdfeSPeter Zijlstra void dirty_sched_domain_sysctl(int cpu); 11603866e845SSteven Rostedt (Red Hat) void unregister_sched_domain_sysctl(void); 11613866e845SSteven Rostedt (Red Hat) #else 11623866e845SSteven Rostedt (Red Hat) static inline void register_sched_domain_sysctl(void) 11633866e845SSteven Rostedt (Red Hat) { 11643866e845SSteven Rostedt (Red Hat) } 1165bbdacdfeSPeter Zijlstra static inline void dirty_sched_domain_sysctl(int cpu) 1166bbdacdfeSPeter Zijlstra { 1167bbdacdfeSPeter Zijlstra } 11683866e845SSteven Rostedt (Red Hat) static inline void unregister_sched_domain_sysctl(void) 11693866e845SSteven Rostedt (Red Hat) { 11703866e845SSteven Rostedt (Red Hat) } 11713866e845SSteven Rostedt (Red Hat) #endif 11723866e845SSteven Rostedt (Red Hat) 1173e3baac47SPeter Zijlstra #else 1174e3baac47SPeter Zijlstra 1175e3baac47SPeter Zijlstra static inline void sched_ttwu_pending(void) { } 1176e3baac47SPeter Zijlstra 1177518cd623SPeter Zijlstra #endif /* CONFIG_SMP */ 1178391e43daSPeter Zijlstra 1179391e43daSPeter Zijlstra #include "stats.h" 11801051408fSIngo Molnar #include "autogroup.h" 1181391e43daSPeter Zijlstra 1182391e43daSPeter Zijlstra #ifdef CONFIG_CGROUP_SCHED 1183391e43daSPeter Zijlstra 1184391e43daSPeter Zijlstra /* 1185391e43daSPeter Zijlstra * Return the group to which this tasks belongs. 1186391e43daSPeter Zijlstra * 11878af01f56STejun Heo * We cannot use task_css() and friends because the cgroup subsystem 11888af01f56STejun Heo * changes that value before the cgroup_subsys::attach() method is called, 11898af01f56STejun Heo * therefore we cannot pin it and might observe the wrong value. 11908323f26cSPeter Zijlstra * 11918323f26cSPeter Zijlstra * The same is true for autogroup's p->signal->autogroup->tg, the autogroup 11928323f26cSPeter Zijlstra * core changes this before calling sched_move_task(). 11938323f26cSPeter Zijlstra * 11948323f26cSPeter Zijlstra * Instead we use a 'copy' which is updated from sched_move_task() while 11958323f26cSPeter Zijlstra * holding both task_struct::pi_lock and rq::lock. 1196391e43daSPeter Zijlstra */ 1197391e43daSPeter Zijlstra static inline struct task_group *task_group(struct task_struct *p) 1198391e43daSPeter Zijlstra { 11998323f26cSPeter Zijlstra return p->sched_task_group; 1200391e43daSPeter Zijlstra } 1201391e43daSPeter Zijlstra 1202391e43daSPeter Zijlstra /* Change a task's cfs_rq and parent entity if it moves across CPUs/groups */ 1203391e43daSPeter Zijlstra static inline void set_task_rq(struct task_struct *p, unsigned int cpu) 1204391e43daSPeter Zijlstra { 1205391e43daSPeter Zijlstra #if defined(CONFIG_FAIR_GROUP_SCHED) || defined(CONFIG_RT_GROUP_SCHED) 1206391e43daSPeter Zijlstra struct task_group *tg = task_group(p); 1207391e43daSPeter Zijlstra #endif 1208391e43daSPeter Zijlstra 1209391e43daSPeter Zijlstra #ifdef CONFIG_FAIR_GROUP_SCHED 1210ad936d86SByungchul Park set_task_rq_fair(&p->se, p->se.cfs_rq, tg->cfs_rq[cpu]); 1211391e43daSPeter Zijlstra p->se.cfs_rq = tg->cfs_rq[cpu]; 1212391e43daSPeter Zijlstra p->se.parent = tg->se[cpu]; 1213391e43daSPeter Zijlstra #endif 1214391e43daSPeter Zijlstra 1215391e43daSPeter Zijlstra #ifdef CONFIG_RT_GROUP_SCHED 1216391e43daSPeter Zijlstra p->rt.rt_rq = tg->rt_rq[cpu]; 1217391e43daSPeter Zijlstra p->rt.parent = tg->rt_se[cpu]; 1218391e43daSPeter Zijlstra #endif 1219391e43daSPeter Zijlstra } 1220391e43daSPeter Zijlstra 1221391e43daSPeter Zijlstra #else /* CONFIG_CGROUP_SCHED */ 1222391e43daSPeter Zijlstra 1223391e43daSPeter Zijlstra static inline void set_task_rq(struct task_struct *p, unsigned int cpu) { } 1224391e43daSPeter Zijlstra static inline struct task_group *task_group(struct task_struct *p) 1225391e43daSPeter Zijlstra { 1226391e43daSPeter Zijlstra return NULL; 1227391e43daSPeter Zijlstra } 1228391e43daSPeter Zijlstra 1229391e43daSPeter Zijlstra #endif /* CONFIG_CGROUP_SCHED */ 1230391e43daSPeter Zijlstra 1231391e43daSPeter Zijlstra static inline void __set_task_cpu(struct task_struct *p, unsigned int cpu) 1232391e43daSPeter Zijlstra { 1233391e43daSPeter Zijlstra set_task_rq(p, cpu); 1234391e43daSPeter Zijlstra #ifdef CONFIG_SMP 1235391e43daSPeter Zijlstra /* 1236391e43daSPeter Zijlstra * After ->cpu is set up to a new value, task_rq_lock(p, ...) can be 1237391e43daSPeter Zijlstra * successfuly executed on another CPU. We must ensure that updates of 1238391e43daSPeter Zijlstra * per-task data have been completed by this moment. 1239391e43daSPeter Zijlstra */ 1240391e43daSPeter Zijlstra smp_wmb(); 1241c65eacbeSAndy Lutomirski #ifdef CONFIG_THREAD_INFO_IN_TASK 1242c65eacbeSAndy Lutomirski p->cpu = cpu; 1243c65eacbeSAndy Lutomirski #else 1244391e43daSPeter Zijlstra task_thread_info(p)->cpu = cpu; 1245c65eacbeSAndy Lutomirski #endif 1246ac66f547SPeter Zijlstra p->wake_cpu = cpu; 1247391e43daSPeter Zijlstra #endif 1248391e43daSPeter Zijlstra } 1249391e43daSPeter Zijlstra 1250391e43daSPeter Zijlstra /* 1251391e43daSPeter Zijlstra * Tunables that become constants when CONFIG_SCHED_DEBUG is off: 1252391e43daSPeter Zijlstra */ 1253391e43daSPeter Zijlstra #ifdef CONFIG_SCHED_DEBUG 1254c5905afbSIngo Molnar # include <linux/static_key.h> 1255391e43daSPeter Zijlstra # define const_debug __read_mostly 1256391e43daSPeter Zijlstra #else 1257391e43daSPeter Zijlstra # define const_debug const 1258391e43daSPeter Zijlstra #endif 1259391e43daSPeter Zijlstra 1260391e43daSPeter Zijlstra #define SCHED_FEAT(name, enabled) \ 1261391e43daSPeter Zijlstra __SCHED_FEAT_##name , 1262391e43daSPeter Zijlstra 1263391e43daSPeter Zijlstra enum { 1264391e43daSPeter Zijlstra #include "features.h" 1265f8b6d1ccSPeter Zijlstra __SCHED_FEAT_NR, 1266391e43daSPeter Zijlstra }; 1267391e43daSPeter Zijlstra 1268391e43daSPeter Zijlstra #undef SCHED_FEAT 1269391e43daSPeter Zijlstra 1270f8b6d1ccSPeter Zijlstra #if defined(CONFIG_SCHED_DEBUG) && defined(HAVE_JUMP_LABEL) 1271765cc3a4SPatrick Bellasi 1272765cc3a4SPatrick Bellasi /* 1273765cc3a4SPatrick Bellasi * To support run-time toggling of sched features, all the translation units 1274765cc3a4SPatrick Bellasi * (but core.c) reference the sysctl_sched_features defined in core.c. 1275765cc3a4SPatrick Bellasi */ 1276765cc3a4SPatrick Bellasi extern const_debug unsigned int sysctl_sched_features; 1277765cc3a4SPatrick Bellasi 1278f8b6d1ccSPeter Zijlstra #define SCHED_FEAT(name, enabled) \ 1279c5905afbSIngo Molnar static __always_inline bool static_branch_##name(struct static_key *key) \ 1280f8b6d1ccSPeter Zijlstra { \ 12816e76ea8aSJason Baron return static_key_##enabled(key); \ 1282f8b6d1ccSPeter Zijlstra } 1283f8b6d1ccSPeter Zijlstra 1284f8b6d1ccSPeter Zijlstra #include "features.h" 1285f8b6d1ccSPeter Zijlstra #undef SCHED_FEAT 1286f8b6d1ccSPeter Zijlstra 1287c5905afbSIngo Molnar extern struct static_key sched_feat_keys[__SCHED_FEAT_NR]; 1288f8b6d1ccSPeter Zijlstra #define sched_feat(x) (static_branch_##x(&sched_feat_keys[__SCHED_FEAT_##x])) 1289765cc3a4SPatrick Bellasi 1290f8b6d1ccSPeter Zijlstra #else /* !(SCHED_DEBUG && HAVE_JUMP_LABEL) */ 1291765cc3a4SPatrick Bellasi 1292765cc3a4SPatrick Bellasi /* 1293765cc3a4SPatrick Bellasi * Each translation unit has its own copy of sysctl_sched_features to allow 1294765cc3a4SPatrick Bellasi * constants propagation at compile time and compiler optimization based on 1295765cc3a4SPatrick Bellasi * features default. 1296765cc3a4SPatrick Bellasi */ 1297765cc3a4SPatrick Bellasi #define SCHED_FEAT(name, enabled) \ 1298765cc3a4SPatrick Bellasi (1UL << __SCHED_FEAT_##name) * enabled | 1299765cc3a4SPatrick Bellasi static const_debug __maybe_unused unsigned int sysctl_sched_features = 1300765cc3a4SPatrick Bellasi #include "features.h" 1301765cc3a4SPatrick Bellasi 0; 1302765cc3a4SPatrick Bellasi #undef SCHED_FEAT 1303765cc3a4SPatrick Bellasi 1304391e43daSPeter Zijlstra #define sched_feat(x) (sysctl_sched_features & (1UL << __SCHED_FEAT_##x)) 1305765cc3a4SPatrick Bellasi 1306f8b6d1ccSPeter Zijlstra #endif /* SCHED_DEBUG && HAVE_JUMP_LABEL */ 1307391e43daSPeter Zijlstra 13082a595721SSrikar Dronamraju extern struct static_key_false sched_numa_balancing; 1309cb251765SMel Gorman extern struct static_key_false sched_schedstats; 1310cbee9f88SPeter Zijlstra 1311391e43daSPeter Zijlstra static inline u64 global_rt_period(void) 1312391e43daSPeter Zijlstra { 1313391e43daSPeter Zijlstra return (u64)sysctl_sched_rt_period * NSEC_PER_USEC; 1314391e43daSPeter Zijlstra } 1315391e43daSPeter Zijlstra 1316391e43daSPeter Zijlstra static inline u64 global_rt_runtime(void) 1317391e43daSPeter Zijlstra { 1318391e43daSPeter Zijlstra if (sysctl_sched_rt_runtime < 0) 1319391e43daSPeter Zijlstra return RUNTIME_INF; 1320391e43daSPeter Zijlstra 1321391e43daSPeter Zijlstra return (u64)sysctl_sched_rt_runtime * NSEC_PER_USEC; 1322391e43daSPeter Zijlstra } 1323391e43daSPeter Zijlstra 1324391e43daSPeter Zijlstra static inline int task_current(struct rq *rq, struct task_struct *p) 1325391e43daSPeter Zijlstra { 1326391e43daSPeter Zijlstra return rq->curr == p; 1327391e43daSPeter Zijlstra } 1328391e43daSPeter Zijlstra 1329391e43daSPeter Zijlstra static inline int task_running(struct rq *rq, struct task_struct *p) 1330391e43daSPeter Zijlstra { 1331391e43daSPeter Zijlstra #ifdef CONFIG_SMP 1332391e43daSPeter Zijlstra return p->on_cpu; 1333391e43daSPeter Zijlstra #else 1334391e43daSPeter Zijlstra return task_current(rq, p); 1335391e43daSPeter Zijlstra #endif 1336391e43daSPeter Zijlstra } 1337391e43daSPeter Zijlstra 1338da0c1e65SKirill Tkhai static inline int task_on_rq_queued(struct task_struct *p) 1339da0c1e65SKirill Tkhai { 1340da0c1e65SKirill Tkhai return p->on_rq == TASK_ON_RQ_QUEUED; 1341da0c1e65SKirill Tkhai } 1342391e43daSPeter Zijlstra 1343cca26e80SKirill Tkhai static inline int task_on_rq_migrating(struct task_struct *p) 1344cca26e80SKirill Tkhai { 1345cca26e80SKirill Tkhai return p->on_rq == TASK_ON_RQ_MIGRATING; 1346cca26e80SKirill Tkhai } 1347cca26e80SKirill Tkhai 1348391e43daSPeter Zijlstra #ifndef prepare_arch_switch 1349391e43daSPeter Zijlstra # define prepare_arch_switch(next) do { } while (0) 1350391e43daSPeter Zijlstra #endif 135101f23e16SCatalin Marinas #ifndef finish_arch_post_lock_switch 135201f23e16SCatalin Marinas # define finish_arch_post_lock_switch() do { } while (0) 135301f23e16SCatalin Marinas #endif 1354391e43daSPeter Zijlstra 1355b13095f0SLi Zefan /* 1356b13095f0SLi Zefan * wake flags 1357b13095f0SLi Zefan */ 1358b13095f0SLi Zefan #define WF_SYNC 0x01 /* waker goes to sleep after wakeup */ 1359b13095f0SLi Zefan #define WF_FORK 0x02 /* child wakeup after fork */ 1360b13095f0SLi Zefan #define WF_MIGRATED 0x4 /* internal use, task got migrated */ 1361b13095f0SLi Zefan 1362391e43daSPeter Zijlstra /* 1363391e43daSPeter Zijlstra * To aid in avoiding the subversion of "niceness" due to uneven distribution 1364391e43daSPeter Zijlstra * of tasks with abnormal "nice" values across CPUs the contribution that 1365391e43daSPeter Zijlstra * each task makes to its run queue's load is weighted according to its 1366391e43daSPeter Zijlstra * scheduling class and "nice" value. For SCHED_NORMAL tasks this is just a 1367391e43daSPeter Zijlstra * scaled version of the new time slice allocation that they receive on time 1368391e43daSPeter Zijlstra * slice expiry etc. 1369391e43daSPeter Zijlstra */ 1370391e43daSPeter Zijlstra 1371391e43daSPeter Zijlstra #define WEIGHT_IDLEPRIO 3 1372391e43daSPeter Zijlstra #define WMULT_IDLEPRIO 1431655765 1373391e43daSPeter Zijlstra 1374ed82b8a1SAndi Kleen extern const int sched_prio_to_weight[40]; 1375ed82b8a1SAndi Kleen extern const u32 sched_prio_to_wmult[40]; 1376391e43daSPeter Zijlstra 1377ff77e468SPeter Zijlstra /* 1378ff77e468SPeter Zijlstra * {de,en}queue flags: 1379ff77e468SPeter Zijlstra * 1380ff77e468SPeter Zijlstra * DEQUEUE_SLEEP - task is no longer runnable 1381ff77e468SPeter Zijlstra * ENQUEUE_WAKEUP - task just became runnable 1382ff77e468SPeter Zijlstra * 1383ff77e468SPeter Zijlstra * SAVE/RESTORE - an otherwise spurious dequeue/enqueue, done to ensure tasks 1384ff77e468SPeter Zijlstra * are in a known state which allows modification. Such pairs 1385ff77e468SPeter Zijlstra * should preserve as much state as possible. 1386ff77e468SPeter Zijlstra * 1387ff77e468SPeter Zijlstra * MOVE - paired with SAVE/RESTORE, explicitly does not preserve the location 1388ff77e468SPeter Zijlstra * in the runqueue. 1389ff77e468SPeter Zijlstra * 1390ff77e468SPeter Zijlstra * ENQUEUE_HEAD - place at front of runqueue (tail if not specified) 1391ff77e468SPeter Zijlstra * ENQUEUE_REPLENISH - CBS (replenish runtime and postpone deadline) 139259efa0baSPeter Zijlstra * ENQUEUE_MIGRATED - the task was migrated during wakeup 1393ff77e468SPeter Zijlstra * 1394ff77e468SPeter Zijlstra */ 1395ff77e468SPeter Zijlstra 1396ff77e468SPeter Zijlstra #define DEQUEUE_SLEEP 0x01 1397ff77e468SPeter Zijlstra #define DEQUEUE_SAVE 0x02 /* matches ENQUEUE_RESTORE */ 1398ff77e468SPeter Zijlstra #define DEQUEUE_MOVE 0x04 /* matches ENQUEUE_MOVE */ 13990a67d1eeSPeter Zijlstra #define DEQUEUE_NOCLOCK 0x08 /* matches ENQUEUE_NOCLOCK */ 1400ff77e468SPeter Zijlstra 14011de64443SPeter Zijlstra #define ENQUEUE_WAKEUP 0x01 1402ff77e468SPeter Zijlstra #define ENQUEUE_RESTORE 0x02 1403ff77e468SPeter Zijlstra #define ENQUEUE_MOVE 0x04 14040a67d1eeSPeter Zijlstra #define ENQUEUE_NOCLOCK 0x08 1405ff77e468SPeter Zijlstra 14060a67d1eeSPeter Zijlstra #define ENQUEUE_HEAD 0x10 14070a67d1eeSPeter Zijlstra #define ENQUEUE_REPLENISH 0x20 1408c82ba9faSLi Zefan #ifdef CONFIG_SMP 14090a67d1eeSPeter Zijlstra #define ENQUEUE_MIGRATED 0x40 1410c82ba9faSLi Zefan #else 141159efa0baSPeter Zijlstra #define ENQUEUE_MIGRATED 0x00 1412c82ba9faSLi Zefan #endif 1413c82ba9faSLi Zefan 141437e117c0SPeter Zijlstra #define RETRY_TASK ((void *)-1UL) 141537e117c0SPeter Zijlstra 1416c82ba9faSLi Zefan struct sched_class { 1417c82ba9faSLi Zefan const struct sched_class *next; 1418c82ba9faSLi Zefan 1419c82ba9faSLi Zefan void (*enqueue_task) (struct rq *rq, struct task_struct *p, int flags); 1420c82ba9faSLi Zefan void (*dequeue_task) (struct rq *rq, struct task_struct *p, int flags); 1421c82ba9faSLi Zefan void (*yield_task) (struct rq *rq); 1422c82ba9faSLi Zefan bool (*yield_to_task) (struct rq *rq, struct task_struct *p, bool preempt); 1423c82ba9faSLi Zefan 1424c82ba9faSLi Zefan void (*check_preempt_curr) (struct rq *rq, struct task_struct *p, int flags); 1425c82ba9faSLi Zefan 1426606dba2eSPeter Zijlstra /* 1427606dba2eSPeter Zijlstra * It is the responsibility of the pick_next_task() method that will 1428606dba2eSPeter Zijlstra * return the next task to call put_prev_task() on the @prev task or 1429606dba2eSPeter Zijlstra * something equivalent. 143037e117c0SPeter Zijlstra * 143137e117c0SPeter Zijlstra * May return RETRY_TASK when it finds a higher prio class has runnable 143237e117c0SPeter Zijlstra * tasks. 1433606dba2eSPeter Zijlstra */ 1434606dba2eSPeter Zijlstra struct task_struct * (*pick_next_task) (struct rq *rq, 1435e7904a28SPeter Zijlstra struct task_struct *prev, 1436d8ac8971SMatt Fleming struct rq_flags *rf); 1437c82ba9faSLi Zefan void (*put_prev_task) (struct rq *rq, struct task_struct *p); 1438c82ba9faSLi Zefan 1439c82ba9faSLi Zefan #ifdef CONFIG_SMP 1440ac66f547SPeter Zijlstra int (*select_task_rq)(struct task_struct *p, int task_cpu, int sd_flag, int flags); 14415a4fd036Sxiaofeng.yan void (*migrate_task_rq)(struct task_struct *p); 1442c82ba9faSLi Zefan 1443c82ba9faSLi Zefan void (*task_woken) (struct rq *this_rq, struct task_struct *task); 1444c82ba9faSLi Zefan 1445c82ba9faSLi Zefan void (*set_cpus_allowed)(struct task_struct *p, 1446c82ba9faSLi Zefan const struct cpumask *newmask); 1447c82ba9faSLi Zefan 1448c82ba9faSLi Zefan void (*rq_online)(struct rq *rq); 1449c82ba9faSLi Zefan void (*rq_offline)(struct rq *rq); 1450c82ba9faSLi Zefan #endif 1451c82ba9faSLi Zefan 1452c82ba9faSLi Zefan void (*set_curr_task) (struct rq *rq); 1453c82ba9faSLi Zefan void (*task_tick) (struct rq *rq, struct task_struct *p, int queued); 1454c82ba9faSLi Zefan void (*task_fork) (struct task_struct *p); 1455e6c390f2SDario Faggioli void (*task_dead) (struct task_struct *p); 1456c82ba9faSLi Zefan 145767dfa1b7SKirill Tkhai /* 145867dfa1b7SKirill Tkhai * The switched_from() call is allowed to drop rq->lock, therefore we 145967dfa1b7SKirill Tkhai * cannot assume the switched_from/switched_to pair is serliazed by 146067dfa1b7SKirill Tkhai * rq->lock. They are however serialized by p->pi_lock. 146167dfa1b7SKirill Tkhai */ 1462c82ba9faSLi Zefan void (*switched_from) (struct rq *this_rq, struct task_struct *task); 1463c82ba9faSLi Zefan void (*switched_to) (struct rq *this_rq, struct task_struct *task); 1464c82ba9faSLi Zefan void (*prio_changed) (struct rq *this_rq, struct task_struct *task, 1465c82ba9faSLi Zefan int oldprio); 1466c82ba9faSLi Zefan 1467c82ba9faSLi Zefan unsigned int (*get_rr_interval) (struct rq *rq, 1468c82ba9faSLi Zefan struct task_struct *task); 1469c82ba9faSLi Zefan 14706e998916SStanislaw Gruszka void (*update_curr) (struct rq *rq); 14716e998916SStanislaw Gruszka 1472ea86cb4bSVincent Guittot #define TASK_SET_GROUP 0 1473ea86cb4bSVincent Guittot #define TASK_MOVE_GROUP 1 1474ea86cb4bSVincent Guittot 1475c82ba9faSLi Zefan #ifdef CONFIG_FAIR_GROUP_SCHED 1476ea86cb4bSVincent Guittot void (*task_change_group) (struct task_struct *p, int type); 1477c82ba9faSLi Zefan #endif 1478c82ba9faSLi Zefan }; 1479391e43daSPeter Zijlstra 14803f1d2a31SPeter Zijlstra static inline void put_prev_task(struct rq *rq, struct task_struct *prev) 14813f1d2a31SPeter Zijlstra { 14823f1d2a31SPeter Zijlstra prev->sched_class->put_prev_task(rq, prev); 14833f1d2a31SPeter Zijlstra } 14843f1d2a31SPeter Zijlstra 1485b2bf6c31SPeter Zijlstra static inline void set_curr_task(struct rq *rq, struct task_struct *curr) 1486b2bf6c31SPeter Zijlstra { 1487b2bf6c31SPeter Zijlstra curr->sched_class->set_curr_task(rq); 1488b2bf6c31SPeter Zijlstra } 1489b2bf6c31SPeter Zijlstra 1490f5832c19SNicolas Pitre #ifdef CONFIG_SMP 1491391e43daSPeter Zijlstra #define sched_class_highest (&stop_sched_class) 1492f5832c19SNicolas Pitre #else 1493f5832c19SNicolas Pitre #define sched_class_highest (&dl_sched_class) 1494f5832c19SNicolas Pitre #endif 1495391e43daSPeter Zijlstra #define for_each_class(class) \ 1496391e43daSPeter Zijlstra for (class = sched_class_highest; class; class = class->next) 1497391e43daSPeter Zijlstra 1498391e43daSPeter Zijlstra extern const struct sched_class stop_sched_class; 1499aab03e05SDario Faggioli extern const struct sched_class dl_sched_class; 1500391e43daSPeter Zijlstra extern const struct sched_class rt_sched_class; 1501391e43daSPeter Zijlstra extern const struct sched_class fair_sched_class; 1502391e43daSPeter Zijlstra extern const struct sched_class idle_sched_class; 1503391e43daSPeter Zijlstra 1504391e43daSPeter Zijlstra 1505391e43daSPeter Zijlstra #ifdef CONFIG_SMP 1506391e43daSPeter Zijlstra 150763b2ca30SNicolas Pitre extern void update_group_capacity(struct sched_domain *sd, int cpu); 1508b719203bSLi Zefan 15097caff66fSDaniel Lezcano extern void trigger_load_balance(struct rq *rq); 1510391e43daSPeter Zijlstra 1511c5b28038SPeter Zijlstra extern void set_cpus_allowed_common(struct task_struct *p, const struct cpumask *new_mask); 1512c5b28038SPeter Zijlstra 1513391e43daSPeter Zijlstra #endif 1514391e43daSPeter Zijlstra 1515442bf3aaSDaniel Lezcano #ifdef CONFIG_CPU_IDLE 1516442bf3aaSDaniel Lezcano static inline void idle_set_state(struct rq *rq, 1517442bf3aaSDaniel Lezcano struct cpuidle_state *idle_state) 1518442bf3aaSDaniel Lezcano { 1519442bf3aaSDaniel Lezcano rq->idle_state = idle_state; 1520442bf3aaSDaniel Lezcano } 1521442bf3aaSDaniel Lezcano 1522442bf3aaSDaniel Lezcano static inline struct cpuidle_state *idle_get_state(struct rq *rq) 1523442bf3aaSDaniel Lezcano { 15249148a3a1SPeter Zijlstra SCHED_WARN_ON(!rcu_read_lock_held()); 1525442bf3aaSDaniel Lezcano return rq->idle_state; 1526442bf3aaSDaniel Lezcano } 1527442bf3aaSDaniel Lezcano #else 1528442bf3aaSDaniel Lezcano static inline void idle_set_state(struct rq *rq, 1529442bf3aaSDaniel Lezcano struct cpuidle_state *idle_state) 1530442bf3aaSDaniel Lezcano { 1531442bf3aaSDaniel Lezcano } 1532442bf3aaSDaniel Lezcano 1533442bf3aaSDaniel Lezcano static inline struct cpuidle_state *idle_get_state(struct rq *rq) 1534442bf3aaSDaniel Lezcano { 1535442bf3aaSDaniel Lezcano return NULL; 1536442bf3aaSDaniel Lezcano } 1537442bf3aaSDaniel Lezcano #endif 1538442bf3aaSDaniel Lezcano 15398663effbSSteven Rostedt (VMware) extern void schedule_idle(void); 15408663effbSSteven Rostedt (VMware) 1541391e43daSPeter Zijlstra extern void sysrq_sched_debug_show(void); 1542391e43daSPeter Zijlstra extern void sched_init_granularity(void); 1543391e43daSPeter Zijlstra extern void update_max_interval(void); 15441baca4ceSJuri Lelli 15451baca4ceSJuri Lelli extern void init_sched_dl_class(void); 1546391e43daSPeter Zijlstra extern void init_sched_rt_class(void); 1547391e43daSPeter Zijlstra extern void init_sched_fair_class(void); 1548391e43daSPeter Zijlstra 15499059393eSVincent Guittot extern void reweight_task(struct task_struct *p, int prio); 15509059393eSVincent Guittot 15518875125eSKirill Tkhai extern void resched_curr(struct rq *rq); 1552391e43daSPeter Zijlstra extern void resched_cpu(int cpu); 1553391e43daSPeter Zijlstra 1554391e43daSPeter Zijlstra extern struct rt_bandwidth def_rt_bandwidth; 1555391e43daSPeter Zijlstra extern void init_rt_bandwidth(struct rt_bandwidth *rt_b, u64 period, u64 runtime); 1556391e43daSPeter Zijlstra 1557332ac17eSDario Faggioli extern struct dl_bandwidth def_dl_bandwidth; 1558332ac17eSDario Faggioli extern void init_dl_bandwidth(struct dl_bandwidth *dl_b, u64 period, u64 runtime); 1559aab03e05SDario Faggioli extern void init_dl_task_timer(struct sched_dl_entity *dl_se); 1560209a0cbdSLuca Abeni extern void init_dl_inactive_task_timer(struct sched_dl_entity *dl_se); 15614da3abceSLuca Abeni extern void init_dl_rq_bw_ratio(struct dl_rq *dl_rq); 1562aab03e05SDario Faggioli 1563c52f14d3SLuca Abeni #define BW_SHIFT 20 1564c52f14d3SLuca Abeni #define BW_UNIT (1 << BW_SHIFT) 15654da3abceSLuca Abeni #define RATIO_SHIFT 8 1566332ac17eSDario Faggioli unsigned long to_ratio(u64 period, u64 runtime); 1567332ac17eSDario Faggioli 1568540247fbSYuyang Du extern void init_entity_runnable_average(struct sched_entity *se); 15692b8c41daSYuyang Du extern void post_init_entity_util_avg(struct sched_entity *se); 1570a75cdaa9SAlex Shi 157176d92ac3SFrederic Weisbecker #ifdef CONFIG_NO_HZ_FULL 157276d92ac3SFrederic Weisbecker extern bool sched_can_stop_tick(struct rq *rq); 157376d92ac3SFrederic Weisbecker 157476d92ac3SFrederic Weisbecker /* 157576d92ac3SFrederic Weisbecker * Tick may be needed by tasks in the runqueue depending on their policy and 157676d92ac3SFrederic Weisbecker * requirements. If tick is needed, lets send the target an IPI to kick it out of 157776d92ac3SFrederic Weisbecker * nohz mode if necessary. 157876d92ac3SFrederic Weisbecker */ 157976d92ac3SFrederic Weisbecker static inline void sched_update_tick_dependency(struct rq *rq) 158076d92ac3SFrederic Weisbecker { 158176d92ac3SFrederic Weisbecker int cpu; 158276d92ac3SFrederic Weisbecker 158376d92ac3SFrederic Weisbecker if (!tick_nohz_full_enabled()) 158476d92ac3SFrederic Weisbecker return; 158576d92ac3SFrederic Weisbecker 158676d92ac3SFrederic Weisbecker cpu = cpu_of(rq); 158776d92ac3SFrederic Weisbecker 158876d92ac3SFrederic Weisbecker if (!tick_nohz_full_cpu(cpu)) 158976d92ac3SFrederic Weisbecker return; 159076d92ac3SFrederic Weisbecker 159176d92ac3SFrederic Weisbecker if (sched_can_stop_tick(rq)) 159276d92ac3SFrederic Weisbecker tick_nohz_dep_clear_cpu(cpu, TICK_DEP_BIT_SCHED); 159376d92ac3SFrederic Weisbecker else 159476d92ac3SFrederic Weisbecker tick_nohz_dep_set_cpu(cpu, TICK_DEP_BIT_SCHED); 159576d92ac3SFrederic Weisbecker } 159676d92ac3SFrederic Weisbecker #else 159776d92ac3SFrederic Weisbecker static inline void sched_update_tick_dependency(struct rq *rq) { } 159876d92ac3SFrederic Weisbecker #endif 159976d92ac3SFrederic Weisbecker 160072465447SKirill Tkhai static inline void add_nr_running(struct rq *rq, unsigned count) 1601391e43daSPeter Zijlstra { 160272465447SKirill Tkhai unsigned prev_nr = rq->nr_running; 160372465447SKirill Tkhai 160472465447SKirill Tkhai rq->nr_running = prev_nr + count; 16059f3660c2SFrederic Weisbecker 160672465447SKirill Tkhai if (prev_nr < 2 && rq->nr_running >= 2) { 16074486edd1STim Chen #ifdef CONFIG_SMP 16084486edd1STim Chen if (!rq->rd->overload) 16094486edd1STim Chen rq->rd->overload = true; 16104486edd1STim Chen #endif 161176d92ac3SFrederic Weisbecker } 16124486edd1STim Chen 161376d92ac3SFrederic Weisbecker sched_update_tick_dependency(rq); 16144486edd1STim Chen } 1615391e43daSPeter Zijlstra 161672465447SKirill Tkhai static inline void sub_nr_running(struct rq *rq, unsigned count) 1617391e43daSPeter Zijlstra { 161872465447SKirill Tkhai rq->nr_running -= count; 161976d92ac3SFrederic Weisbecker /* Check if we still need preemption */ 162076d92ac3SFrederic Weisbecker sched_update_tick_dependency(rq); 1621391e43daSPeter Zijlstra } 1622391e43daSPeter Zijlstra 1623265f22a9SFrederic Weisbecker static inline void rq_last_tick_reset(struct rq *rq) 1624265f22a9SFrederic Weisbecker { 1625265f22a9SFrederic Weisbecker #ifdef CONFIG_NO_HZ_FULL 1626265f22a9SFrederic Weisbecker rq->last_sched_tick = jiffies; 1627265f22a9SFrederic Weisbecker #endif 1628265f22a9SFrederic Weisbecker } 1629265f22a9SFrederic Weisbecker 1630391e43daSPeter Zijlstra extern void update_rq_clock(struct rq *rq); 1631391e43daSPeter Zijlstra 1632391e43daSPeter Zijlstra extern void activate_task(struct rq *rq, struct task_struct *p, int flags); 1633391e43daSPeter Zijlstra extern void deactivate_task(struct rq *rq, struct task_struct *p, int flags); 1634391e43daSPeter Zijlstra 1635391e43daSPeter Zijlstra extern void check_preempt_curr(struct rq *rq, struct task_struct *p, int flags); 1636391e43daSPeter Zijlstra 1637391e43daSPeter Zijlstra extern const_debug unsigned int sysctl_sched_time_avg; 1638391e43daSPeter Zijlstra extern const_debug unsigned int sysctl_sched_nr_migrate; 1639391e43daSPeter Zijlstra extern const_debug unsigned int sysctl_sched_migration_cost; 1640391e43daSPeter Zijlstra 1641391e43daSPeter Zijlstra static inline u64 sched_avg_period(void) 1642391e43daSPeter Zijlstra { 1643391e43daSPeter Zijlstra return (u64)sysctl_sched_time_avg * NSEC_PER_MSEC / 2; 1644391e43daSPeter Zijlstra } 1645391e43daSPeter Zijlstra 1646391e43daSPeter Zijlstra #ifdef CONFIG_SCHED_HRTICK 1647391e43daSPeter Zijlstra 1648391e43daSPeter Zijlstra /* 1649391e43daSPeter Zijlstra * Use hrtick when: 1650391e43daSPeter Zijlstra * - enabled by features 1651391e43daSPeter Zijlstra * - hrtimer is actually high res 1652391e43daSPeter Zijlstra */ 1653391e43daSPeter Zijlstra static inline int hrtick_enabled(struct rq *rq) 1654391e43daSPeter Zijlstra { 1655391e43daSPeter Zijlstra if (!sched_feat(HRTICK)) 1656391e43daSPeter Zijlstra return 0; 1657391e43daSPeter Zijlstra if (!cpu_active(cpu_of(rq))) 1658391e43daSPeter Zijlstra return 0; 1659391e43daSPeter Zijlstra return hrtimer_is_hres_active(&rq->hrtick_timer); 1660391e43daSPeter Zijlstra } 1661391e43daSPeter Zijlstra 1662391e43daSPeter Zijlstra void hrtick_start(struct rq *rq, u64 delay); 1663391e43daSPeter Zijlstra 1664b39e66eaSMike Galbraith #else 1665b39e66eaSMike Galbraith 1666b39e66eaSMike Galbraith static inline int hrtick_enabled(struct rq *rq) 1667b39e66eaSMike Galbraith { 1668b39e66eaSMike Galbraith return 0; 1669b39e66eaSMike Galbraith } 1670b39e66eaSMike Galbraith 1671391e43daSPeter Zijlstra #endif /* CONFIG_SCHED_HRTICK */ 1672391e43daSPeter Zijlstra 1673391e43daSPeter Zijlstra #ifdef CONFIG_SMP 1674391e43daSPeter Zijlstra extern void sched_avg_update(struct rq *rq); 1675dfbca41fSPeter Zijlstra 1676dfbca41fSPeter Zijlstra #ifndef arch_scale_freq_capacity 1677dfbca41fSPeter Zijlstra static __always_inline 16787673c8a4SJuri Lelli unsigned long arch_scale_freq_capacity(int cpu) 1679dfbca41fSPeter Zijlstra { 1680dfbca41fSPeter Zijlstra return SCHED_CAPACITY_SCALE; 1681dfbca41fSPeter Zijlstra } 1682dfbca41fSPeter Zijlstra #endif 1683b5b4860dSVincent Guittot 16848cd5601cSMorten Rasmussen #ifndef arch_scale_cpu_capacity 16858cd5601cSMorten Rasmussen static __always_inline 16868cd5601cSMorten Rasmussen unsigned long arch_scale_cpu_capacity(struct sched_domain *sd, int cpu) 16878cd5601cSMorten Rasmussen { 1688e3279a2eSDietmar Eggemann if (sd && (sd->flags & SD_SHARE_CPUCAPACITY) && (sd->span_weight > 1)) 16898cd5601cSMorten Rasmussen return sd->smt_gain / sd->span_weight; 16908cd5601cSMorten Rasmussen 16918cd5601cSMorten Rasmussen return SCHED_CAPACITY_SCALE; 16928cd5601cSMorten Rasmussen } 16938cd5601cSMorten Rasmussen #endif 16948cd5601cSMorten Rasmussen 1695391e43daSPeter Zijlstra static inline void sched_rt_avg_update(struct rq *rq, u64 rt_delta) 1696391e43daSPeter Zijlstra { 16977673c8a4SJuri Lelli rq->rt_avg += rt_delta * arch_scale_freq_capacity(cpu_of(rq)); 1698391e43daSPeter Zijlstra sched_avg_update(rq); 1699391e43daSPeter Zijlstra } 1700391e43daSPeter Zijlstra #else 1701391e43daSPeter Zijlstra static inline void sched_rt_avg_update(struct rq *rq, u64 rt_delta) { } 1702391e43daSPeter Zijlstra static inline void sched_avg_update(struct rq *rq) { } 1703391e43daSPeter Zijlstra #endif 1704391e43daSPeter Zijlstra 1705eb580751SPeter Zijlstra struct rq *__task_rq_lock(struct task_struct *p, struct rq_flags *rf) 17063e71a462SPeter Zijlstra __acquires(rq->lock); 17078a8c69c3SPeter Zijlstra 1708eb580751SPeter Zijlstra struct rq *task_rq_lock(struct task_struct *p, struct rq_flags *rf) 17093960c8c0SPeter Zijlstra __acquires(p->pi_lock) 17103e71a462SPeter Zijlstra __acquires(rq->lock); 17113960c8c0SPeter Zijlstra 1712eb580751SPeter Zijlstra static inline void __task_rq_unlock(struct rq *rq, struct rq_flags *rf) 17133960c8c0SPeter Zijlstra __releases(rq->lock) 17143960c8c0SPeter Zijlstra { 1715d8ac8971SMatt Fleming rq_unpin_lock(rq, rf); 17163960c8c0SPeter Zijlstra raw_spin_unlock(&rq->lock); 17173960c8c0SPeter Zijlstra } 17183960c8c0SPeter Zijlstra 17193960c8c0SPeter Zijlstra static inline void 1720eb580751SPeter Zijlstra task_rq_unlock(struct rq *rq, struct task_struct *p, struct rq_flags *rf) 17213960c8c0SPeter Zijlstra __releases(rq->lock) 17223960c8c0SPeter Zijlstra __releases(p->pi_lock) 17233960c8c0SPeter Zijlstra { 1724d8ac8971SMatt Fleming rq_unpin_lock(rq, rf); 17253960c8c0SPeter Zijlstra raw_spin_unlock(&rq->lock); 1726eb580751SPeter Zijlstra raw_spin_unlock_irqrestore(&p->pi_lock, rf->flags); 17273960c8c0SPeter Zijlstra } 17283960c8c0SPeter Zijlstra 17298a8c69c3SPeter Zijlstra static inline void 17308a8c69c3SPeter Zijlstra rq_lock_irqsave(struct rq *rq, struct rq_flags *rf) 17318a8c69c3SPeter Zijlstra __acquires(rq->lock) 17328a8c69c3SPeter Zijlstra { 17338a8c69c3SPeter Zijlstra raw_spin_lock_irqsave(&rq->lock, rf->flags); 17348a8c69c3SPeter Zijlstra rq_pin_lock(rq, rf); 17358a8c69c3SPeter Zijlstra } 17368a8c69c3SPeter Zijlstra 17378a8c69c3SPeter Zijlstra static inline void 17388a8c69c3SPeter Zijlstra rq_lock_irq(struct rq *rq, struct rq_flags *rf) 17398a8c69c3SPeter Zijlstra __acquires(rq->lock) 17408a8c69c3SPeter Zijlstra { 17418a8c69c3SPeter Zijlstra raw_spin_lock_irq(&rq->lock); 17428a8c69c3SPeter Zijlstra rq_pin_lock(rq, rf); 17438a8c69c3SPeter Zijlstra } 17448a8c69c3SPeter Zijlstra 17458a8c69c3SPeter Zijlstra static inline void 17468a8c69c3SPeter Zijlstra rq_lock(struct rq *rq, struct rq_flags *rf) 17478a8c69c3SPeter Zijlstra __acquires(rq->lock) 17488a8c69c3SPeter Zijlstra { 17498a8c69c3SPeter Zijlstra raw_spin_lock(&rq->lock); 17508a8c69c3SPeter Zijlstra rq_pin_lock(rq, rf); 17518a8c69c3SPeter Zijlstra } 17528a8c69c3SPeter Zijlstra 17538a8c69c3SPeter Zijlstra static inline void 17548a8c69c3SPeter Zijlstra rq_relock(struct rq *rq, struct rq_flags *rf) 17558a8c69c3SPeter Zijlstra __acquires(rq->lock) 17568a8c69c3SPeter Zijlstra { 17578a8c69c3SPeter Zijlstra raw_spin_lock(&rq->lock); 17588a8c69c3SPeter Zijlstra rq_repin_lock(rq, rf); 17598a8c69c3SPeter Zijlstra } 17608a8c69c3SPeter Zijlstra 17618a8c69c3SPeter Zijlstra static inline void 17628a8c69c3SPeter Zijlstra rq_unlock_irqrestore(struct rq *rq, struct rq_flags *rf) 17638a8c69c3SPeter Zijlstra __releases(rq->lock) 17648a8c69c3SPeter Zijlstra { 17658a8c69c3SPeter Zijlstra rq_unpin_lock(rq, rf); 17668a8c69c3SPeter Zijlstra raw_spin_unlock_irqrestore(&rq->lock, rf->flags); 17678a8c69c3SPeter Zijlstra } 17688a8c69c3SPeter Zijlstra 17698a8c69c3SPeter Zijlstra static inline void 17708a8c69c3SPeter Zijlstra rq_unlock_irq(struct rq *rq, struct rq_flags *rf) 17718a8c69c3SPeter Zijlstra __releases(rq->lock) 17728a8c69c3SPeter Zijlstra { 17738a8c69c3SPeter Zijlstra rq_unpin_lock(rq, rf); 17748a8c69c3SPeter Zijlstra raw_spin_unlock_irq(&rq->lock); 17758a8c69c3SPeter Zijlstra } 17768a8c69c3SPeter Zijlstra 17778a8c69c3SPeter Zijlstra static inline void 17788a8c69c3SPeter Zijlstra rq_unlock(struct rq *rq, struct rq_flags *rf) 17798a8c69c3SPeter Zijlstra __releases(rq->lock) 17808a8c69c3SPeter Zijlstra { 17818a8c69c3SPeter Zijlstra rq_unpin_lock(rq, rf); 17828a8c69c3SPeter Zijlstra raw_spin_unlock(&rq->lock); 17838a8c69c3SPeter Zijlstra } 17848a8c69c3SPeter Zijlstra 1785391e43daSPeter Zijlstra #ifdef CONFIG_SMP 1786391e43daSPeter Zijlstra #ifdef CONFIG_PREEMPT 1787391e43daSPeter Zijlstra 1788391e43daSPeter Zijlstra static inline void double_rq_lock(struct rq *rq1, struct rq *rq2); 1789391e43daSPeter Zijlstra 1790391e43daSPeter Zijlstra /* 1791391e43daSPeter Zijlstra * fair double_lock_balance: Safely acquires both rq->locks in a fair 1792391e43daSPeter Zijlstra * way at the expense of forcing extra atomic operations in all 1793391e43daSPeter Zijlstra * invocations. This assures that the double_lock is acquired using the 1794391e43daSPeter Zijlstra * same underlying policy as the spinlock_t on this architecture, which 1795391e43daSPeter Zijlstra * reduces latency compared to the unfair variant below. However, it 1796391e43daSPeter Zijlstra * also adds more overhead and therefore may reduce throughput. 1797391e43daSPeter Zijlstra */ 1798391e43daSPeter Zijlstra static inline int _double_lock_balance(struct rq *this_rq, struct rq *busiest) 1799391e43daSPeter Zijlstra __releases(this_rq->lock) 1800391e43daSPeter Zijlstra __acquires(busiest->lock) 1801391e43daSPeter Zijlstra __acquires(this_rq->lock) 1802391e43daSPeter Zijlstra { 1803391e43daSPeter Zijlstra raw_spin_unlock(&this_rq->lock); 1804391e43daSPeter Zijlstra double_rq_lock(this_rq, busiest); 1805391e43daSPeter Zijlstra 1806391e43daSPeter Zijlstra return 1; 1807391e43daSPeter Zijlstra } 1808391e43daSPeter Zijlstra 1809391e43daSPeter Zijlstra #else 1810391e43daSPeter Zijlstra /* 1811391e43daSPeter Zijlstra * Unfair double_lock_balance: Optimizes throughput at the expense of 1812391e43daSPeter Zijlstra * latency by eliminating extra atomic operations when the locks are 1813391e43daSPeter Zijlstra * already in proper order on entry. This favors lower cpu-ids and will 1814391e43daSPeter Zijlstra * grant the double lock to lower cpus over higher ids under contention, 1815391e43daSPeter Zijlstra * regardless of entry order into the function. 1816391e43daSPeter Zijlstra */ 1817391e43daSPeter Zijlstra static inline int _double_lock_balance(struct rq *this_rq, struct rq *busiest) 1818391e43daSPeter Zijlstra __releases(this_rq->lock) 1819391e43daSPeter Zijlstra __acquires(busiest->lock) 1820391e43daSPeter Zijlstra __acquires(this_rq->lock) 1821391e43daSPeter Zijlstra { 1822391e43daSPeter Zijlstra int ret = 0; 1823391e43daSPeter Zijlstra 1824391e43daSPeter Zijlstra if (unlikely(!raw_spin_trylock(&busiest->lock))) { 1825391e43daSPeter Zijlstra if (busiest < this_rq) { 1826391e43daSPeter Zijlstra raw_spin_unlock(&this_rq->lock); 1827391e43daSPeter Zijlstra raw_spin_lock(&busiest->lock); 1828391e43daSPeter Zijlstra raw_spin_lock_nested(&this_rq->lock, 1829391e43daSPeter Zijlstra SINGLE_DEPTH_NESTING); 1830391e43daSPeter Zijlstra ret = 1; 1831391e43daSPeter Zijlstra } else 1832391e43daSPeter Zijlstra raw_spin_lock_nested(&busiest->lock, 1833391e43daSPeter Zijlstra SINGLE_DEPTH_NESTING); 1834391e43daSPeter Zijlstra } 1835391e43daSPeter Zijlstra return ret; 1836391e43daSPeter Zijlstra } 1837391e43daSPeter Zijlstra 1838391e43daSPeter Zijlstra #endif /* CONFIG_PREEMPT */ 1839391e43daSPeter Zijlstra 1840391e43daSPeter Zijlstra /* 1841391e43daSPeter Zijlstra * double_lock_balance - lock the busiest runqueue, this_rq is locked already. 1842391e43daSPeter Zijlstra */ 1843391e43daSPeter Zijlstra static inline int double_lock_balance(struct rq *this_rq, struct rq *busiest) 1844391e43daSPeter Zijlstra { 1845391e43daSPeter Zijlstra if (unlikely(!irqs_disabled())) { 1846391e43daSPeter Zijlstra /* printk() doesn't work good under rq->lock */ 1847391e43daSPeter Zijlstra raw_spin_unlock(&this_rq->lock); 1848391e43daSPeter Zijlstra BUG_ON(1); 1849391e43daSPeter Zijlstra } 1850391e43daSPeter Zijlstra 1851391e43daSPeter Zijlstra return _double_lock_balance(this_rq, busiest); 1852391e43daSPeter Zijlstra } 1853391e43daSPeter Zijlstra 1854391e43daSPeter Zijlstra static inline void double_unlock_balance(struct rq *this_rq, struct rq *busiest) 1855391e43daSPeter Zijlstra __releases(busiest->lock) 1856391e43daSPeter Zijlstra { 1857391e43daSPeter Zijlstra raw_spin_unlock(&busiest->lock); 1858391e43daSPeter Zijlstra lock_set_subclass(&this_rq->lock.dep_map, 0, _RET_IP_); 1859391e43daSPeter Zijlstra } 1860391e43daSPeter Zijlstra 186174602315SPeter Zijlstra static inline void double_lock(spinlock_t *l1, spinlock_t *l2) 186274602315SPeter Zijlstra { 186374602315SPeter Zijlstra if (l1 > l2) 186474602315SPeter Zijlstra swap(l1, l2); 186574602315SPeter Zijlstra 186674602315SPeter Zijlstra spin_lock(l1); 186774602315SPeter Zijlstra spin_lock_nested(l2, SINGLE_DEPTH_NESTING); 186874602315SPeter Zijlstra } 186974602315SPeter Zijlstra 187060e69eedSMike Galbraith static inline void double_lock_irq(spinlock_t *l1, spinlock_t *l2) 187160e69eedSMike Galbraith { 187260e69eedSMike Galbraith if (l1 > l2) 187360e69eedSMike Galbraith swap(l1, l2); 187460e69eedSMike Galbraith 187560e69eedSMike Galbraith spin_lock_irq(l1); 187660e69eedSMike Galbraith spin_lock_nested(l2, SINGLE_DEPTH_NESTING); 187760e69eedSMike Galbraith } 187860e69eedSMike Galbraith 187974602315SPeter Zijlstra static inline void double_raw_lock(raw_spinlock_t *l1, raw_spinlock_t *l2) 188074602315SPeter Zijlstra { 188174602315SPeter Zijlstra if (l1 > l2) 188274602315SPeter Zijlstra swap(l1, l2); 188374602315SPeter Zijlstra 188474602315SPeter Zijlstra raw_spin_lock(l1); 188574602315SPeter Zijlstra raw_spin_lock_nested(l2, SINGLE_DEPTH_NESTING); 188674602315SPeter Zijlstra } 188774602315SPeter Zijlstra 1888391e43daSPeter Zijlstra /* 1889391e43daSPeter Zijlstra * double_rq_lock - safely lock two runqueues 1890391e43daSPeter Zijlstra * 1891391e43daSPeter Zijlstra * Note this does not disable interrupts like task_rq_lock, 1892391e43daSPeter Zijlstra * you need to do so manually before calling. 1893391e43daSPeter Zijlstra */ 1894391e43daSPeter Zijlstra static inline void double_rq_lock(struct rq *rq1, struct rq *rq2) 1895391e43daSPeter Zijlstra __acquires(rq1->lock) 1896391e43daSPeter Zijlstra __acquires(rq2->lock) 1897391e43daSPeter Zijlstra { 1898391e43daSPeter Zijlstra BUG_ON(!irqs_disabled()); 1899391e43daSPeter Zijlstra if (rq1 == rq2) { 1900391e43daSPeter Zijlstra raw_spin_lock(&rq1->lock); 1901391e43daSPeter Zijlstra __acquire(rq2->lock); /* Fake it out ;) */ 1902391e43daSPeter Zijlstra } else { 1903391e43daSPeter Zijlstra if (rq1 < rq2) { 1904391e43daSPeter Zijlstra raw_spin_lock(&rq1->lock); 1905391e43daSPeter Zijlstra raw_spin_lock_nested(&rq2->lock, SINGLE_DEPTH_NESTING); 1906391e43daSPeter Zijlstra } else { 1907391e43daSPeter Zijlstra raw_spin_lock(&rq2->lock); 1908391e43daSPeter Zijlstra raw_spin_lock_nested(&rq1->lock, SINGLE_DEPTH_NESTING); 1909391e43daSPeter Zijlstra } 1910391e43daSPeter Zijlstra } 1911391e43daSPeter Zijlstra } 1912391e43daSPeter Zijlstra 1913391e43daSPeter Zijlstra /* 1914391e43daSPeter Zijlstra * double_rq_unlock - safely unlock two runqueues 1915391e43daSPeter Zijlstra * 1916391e43daSPeter Zijlstra * Note this does not restore interrupts like task_rq_unlock, 1917391e43daSPeter Zijlstra * you need to do so manually after calling. 1918391e43daSPeter Zijlstra */ 1919391e43daSPeter Zijlstra static inline void double_rq_unlock(struct rq *rq1, struct rq *rq2) 1920391e43daSPeter Zijlstra __releases(rq1->lock) 1921391e43daSPeter Zijlstra __releases(rq2->lock) 1922391e43daSPeter Zijlstra { 1923391e43daSPeter Zijlstra raw_spin_unlock(&rq1->lock); 1924391e43daSPeter Zijlstra if (rq1 != rq2) 1925391e43daSPeter Zijlstra raw_spin_unlock(&rq2->lock); 1926391e43daSPeter Zijlstra else 1927391e43daSPeter Zijlstra __release(rq2->lock); 1928391e43daSPeter Zijlstra } 1929391e43daSPeter Zijlstra 1930f2cb1360SIngo Molnar extern void set_rq_online (struct rq *rq); 1931f2cb1360SIngo Molnar extern void set_rq_offline(struct rq *rq); 1932f2cb1360SIngo Molnar extern bool sched_smp_initialized; 1933f2cb1360SIngo Molnar 1934391e43daSPeter Zijlstra #else /* CONFIG_SMP */ 1935391e43daSPeter Zijlstra 1936391e43daSPeter Zijlstra /* 1937391e43daSPeter Zijlstra * double_rq_lock - safely lock two runqueues 1938391e43daSPeter Zijlstra * 1939391e43daSPeter Zijlstra * Note this does not disable interrupts like task_rq_lock, 1940391e43daSPeter Zijlstra * you need to do so manually before calling. 1941391e43daSPeter Zijlstra */ 1942391e43daSPeter Zijlstra static inline void double_rq_lock(struct rq *rq1, struct rq *rq2) 1943391e43daSPeter Zijlstra __acquires(rq1->lock) 1944391e43daSPeter Zijlstra __acquires(rq2->lock) 1945391e43daSPeter Zijlstra { 1946391e43daSPeter Zijlstra BUG_ON(!irqs_disabled()); 1947391e43daSPeter Zijlstra BUG_ON(rq1 != rq2); 1948391e43daSPeter Zijlstra raw_spin_lock(&rq1->lock); 1949391e43daSPeter Zijlstra __acquire(rq2->lock); /* Fake it out ;) */ 1950391e43daSPeter Zijlstra } 1951391e43daSPeter Zijlstra 1952391e43daSPeter Zijlstra /* 1953391e43daSPeter Zijlstra * double_rq_unlock - safely unlock two runqueues 1954391e43daSPeter Zijlstra * 1955391e43daSPeter Zijlstra * Note this does not restore interrupts like task_rq_unlock, 1956391e43daSPeter Zijlstra * you need to do so manually after calling. 1957391e43daSPeter Zijlstra */ 1958391e43daSPeter Zijlstra static inline void double_rq_unlock(struct rq *rq1, struct rq *rq2) 1959391e43daSPeter Zijlstra __releases(rq1->lock) 1960391e43daSPeter Zijlstra __releases(rq2->lock) 1961391e43daSPeter Zijlstra { 1962391e43daSPeter Zijlstra BUG_ON(rq1 != rq2); 1963391e43daSPeter Zijlstra raw_spin_unlock(&rq1->lock); 1964391e43daSPeter Zijlstra __release(rq2->lock); 1965391e43daSPeter Zijlstra } 1966391e43daSPeter Zijlstra 1967391e43daSPeter Zijlstra #endif 1968391e43daSPeter Zijlstra 1969391e43daSPeter Zijlstra extern struct sched_entity *__pick_first_entity(struct cfs_rq *cfs_rq); 1970391e43daSPeter Zijlstra extern struct sched_entity *__pick_last_entity(struct cfs_rq *cfs_rq); 19716b55c965SSrikar Dronamraju 19726b55c965SSrikar Dronamraju #ifdef CONFIG_SCHED_DEBUG 19739469eb01SPeter Zijlstra extern bool sched_debug_enabled; 19749469eb01SPeter Zijlstra 1975391e43daSPeter Zijlstra extern void print_cfs_stats(struct seq_file *m, int cpu); 1976391e43daSPeter Zijlstra extern void print_rt_stats(struct seq_file *m, int cpu); 1977acb32132SWanpeng Li extern void print_dl_stats(struct seq_file *m, int cpu); 19786b55c965SSrikar Dronamraju extern void 19796b55c965SSrikar Dronamraju print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq); 1980397f2378SSrikar Dronamraju #ifdef CONFIG_NUMA_BALANCING 1981397f2378SSrikar Dronamraju extern void 1982397f2378SSrikar Dronamraju show_numa_stats(struct task_struct *p, struct seq_file *m); 1983397f2378SSrikar Dronamraju extern void 1984397f2378SSrikar Dronamraju print_numa_stats(struct seq_file *m, int node, unsigned long tsf, 1985397f2378SSrikar Dronamraju unsigned long tpf, unsigned long gsf, unsigned long gpf); 1986397f2378SSrikar Dronamraju #endif /* CONFIG_NUMA_BALANCING */ 1987397f2378SSrikar Dronamraju #endif /* CONFIG_SCHED_DEBUG */ 1988391e43daSPeter Zijlstra 1989391e43daSPeter Zijlstra extern void init_cfs_rq(struct cfs_rq *cfs_rq); 199007c54f7aSAbel Vesa extern void init_rt_rq(struct rt_rq *rt_rq); 199107c54f7aSAbel Vesa extern void init_dl_rq(struct dl_rq *dl_rq); 1992391e43daSPeter Zijlstra 19931ee14e6cSBen Segall extern void cfs_bandwidth_usage_inc(void); 19941ee14e6cSBen Segall extern void cfs_bandwidth_usage_dec(void); 19951c792db7SSuresh Siddha 19963451d024SFrederic Weisbecker #ifdef CONFIG_NO_HZ_COMMON 19971c792db7SSuresh Siddha enum rq_nohz_flag_bits { 19981c792db7SSuresh Siddha NOHZ_TICK_STOPPED, 19991c792db7SSuresh Siddha NOHZ_BALANCE_KICK, 20001c792db7SSuresh Siddha }; 20011c792db7SSuresh Siddha 20021c792db7SSuresh Siddha #define nohz_flags(cpu) (&cpu_rq(cpu)->nohz_flags) 200320a5c8ccSThomas Gleixner 200420a5c8ccSThomas Gleixner extern void nohz_balance_exit_idle(unsigned int cpu); 200520a5c8ccSThomas Gleixner #else 200620a5c8ccSThomas Gleixner static inline void nohz_balance_exit_idle(unsigned int cpu) { } 20071c792db7SSuresh Siddha #endif 200873fbec60SFrederic Weisbecker 2009daec5798SLuca Abeni 2010daec5798SLuca Abeni #ifdef CONFIG_SMP 2011daec5798SLuca Abeni static inline 2012daec5798SLuca Abeni void __dl_update(struct dl_bw *dl_b, s64 bw) 2013daec5798SLuca Abeni { 2014daec5798SLuca Abeni struct root_domain *rd = container_of(dl_b, struct root_domain, dl_bw); 2015daec5798SLuca Abeni int i; 2016daec5798SLuca Abeni 2017daec5798SLuca Abeni RCU_LOCKDEP_WARN(!rcu_read_lock_sched_held(), 2018daec5798SLuca Abeni "sched RCU must be held"); 2019daec5798SLuca Abeni for_each_cpu_and(i, rd->span, cpu_active_mask) { 2020daec5798SLuca Abeni struct rq *rq = cpu_rq(i); 2021daec5798SLuca Abeni 2022daec5798SLuca Abeni rq->dl.extra_bw += bw; 2023daec5798SLuca Abeni } 2024daec5798SLuca Abeni } 2025daec5798SLuca Abeni #else 2026daec5798SLuca Abeni static inline 2027daec5798SLuca Abeni void __dl_update(struct dl_bw *dl_b, s64 bw) 2028daec5798SLuca Abeni { 2029daec5798SLuca Abeni struct dl_rq *dl = container_of(dl_b, struct dl_rq, dl_bw); 2030daec5798SLuca Abeni 2031daec5798SLuca Abeni dl->extra_bw += bw; 2032daec5798SLuca Abeni } 2033daec5798SLuca Abeni #endif 2034daec5798SLuca Abeni 2035daec5798SLuca Abeni 203673fbec60SFrederic Weisbecker #ifdef CONFIG_IRQ_TIME_ACCOUNTING 203719d23dbfSFrederic Weisbecker struct irqtime { 203825e2d8c1SFrederic Weisbecker u64 total; 2039a499a5a1SFrederic Weisbecker u64 tick_delta; 204019d23dbfSFrederic Weisbecker u64 irq_start_time; 204119d23dbfSFrederic Weisbecker struct u64_stats_sync sync; 204219d23dbfSFrederic Weisbecker }; 204373fbec60SFrederic Weisbecker 204419d23dbfSFrederic Weisbecker DECLARE_PER_CPU(struct irqtime, cpu_irqtime); 204573fbec60SFrederic Weisbecker 204625e2d8c1SFrederic Weisbecker /* 204725e2d8c1SFrederic Weisbecker * Returns the irqtime minus the softirq time computed by ksoftirqd. 204825e2d8c1SFrederic Weisbecker * Otherwise ksoftirqd's sum_exec_runtime is substracted its own runtime 204925e2d8c1SFrederic Weisbecker * and never move forward. 205025e2d8c1SFrederic Weisbecker */ 205173fbec60SFrederic Weisbecker static inline u64 irq_time_read(int cpu) 205273fbec60SFrederic Weisbecker { 205319d23dbfSFrederic Weisbecker struct irqtime *irqtime = &per_cpu(cpu_irqtime, cpu); 205419d23dbfSFrederic Weisbecker unsigned int seq; 205519d23dbfSFrederic Weisbecker u64 total; 205673fbec60SFrederic Weisbecker 205773fbec60SFrederic Weisbecker do { 205819d23dbfSFrederic Weisbecker seq = __u64_stats_fetch_begin(&irqtime->sync); 205925e2d8c1SFrederic Weisbecker total = irqtime->total; 206019d23dbfSFrederic Weisbecker } while (__u64_stats_fetch_retry(&irqtime->sync, seq)); 206173fbec60SFrederic Weisbecker 206219d23dbfSFrederic Weisbecker return total; 206373fbec60SFrederic Weisbecker } 206473fbec60SFrederic Weisbecker #endif /* CONFIG_IRQ_TIME_ACCOUNTING */ 2065adaf9fcdSRafael J. Wysocki 2066adaf9fcdSRafael J. Wysocki #ifdef CONFIG_CPU_FREQ 2067adaf9fcdSRafael J. Wysocki DECLARE_PER_CPU(struct update_util_data *, cpufreq_update_util_data); 2068adaf9fcdSRafael J. Wysocki 2069adaf9fcdSRafael J. Wysocki /** 2070adaf9fcdSRafael J. Wysocki * cpufreq_update_util - Take a note about CPU utilization changes. 207112bde33dSRafael J. Wysocki * @rq: Runqueue to carry out the update for. 207258919e83SRafael J. Wysocki * @flags: Update reason flags. 2073adaf9fcdSRafael J. Wysocki * 207458919e83SRafael J. Wysocki * This function is called by the scheduler on the CPU whose utilization is 207558919e83SRafael J. Wysocki * being updated. 2076adaf9fcdSRafael J. Wysocki * 2077adaf9fcdSRafael J. Wysocki * It can only be called from RCU-sched read-side critical sections. 2078adaf9fcdSRafael J. Wysocki * 2079adaf9fcdSRafael J. Wysocki * The way cpufreq is currently arranged requires it to evaluate the CPU 2080adaf9fcdSRafael J. Wysocki * performance state (frequency/voltage) on a regular basis to prevent it from 2081adaf9fcdSRafael J. Wysocki * being stuck in a completely inadequate performance level for too long. 2082e0367b12SJuri Lelli * That is not guaranteed to happen if the updates are only triggered from CFS 2083e0367b12SJuri Lelli * and DL, though, because they may not be coming in if only RT tasks are 2084e0367b12SJuri Lelli * active all the time (or there are RT tasks only). 2085adaf9fcdSRafael J. Wysocki * 2086e0367b12SJuri Lelli * As a workaround for that issue, this function is called periodically by the 2087e0367b12SJuri Lelli * RT sched class to trigger extra cpufreq updates to prevent it from stalling, 2088adaf9fcdSRafael J. Wysocki * but that really is a band-aid. Going forward it should be replaced with 2089e0367b12SJuri Lelli * solutions targeted more specifically at RT tasks. 2090adaf9fcdSRafael J. Wysocki */ 209112bde33dSRafael J. Wysocki static inline void cpufreq_update_util(struct rq *rq, unsigned int flags) 2092adaf9fcdSRafael J. Wysocki { 209358919e83SRafael J. Wysocki struct update_util_data *data; 209458919e83SRafael J. Wysocki 2095674e7541SViresh Kumar data = rcu_dereference_sched(*per_cpu_ptr(&cpufreq_update_util_data, 2096674e7541SViresh Kumar cpu_of(rq))); 209758919e83SRafael J. Wysocki if (data) 209812bde33dSRafael J. Wysocki data->func(data, rq_clock(rq), flags); 209912bde33dSRafael J. Wysocki } 2100adaf9fcdSRafael J. Wysocki #else 210112bde33dSRafael J. Wysocki static inline void cpufreq_update_util(struct rq *rq, unsigned int flags) {} 2102adaf9fcdSRafael J. Wysocki #endif /* CONFIG_CPU_FREQ */ 2103be53f58fSLinus Torvalds 21049bdcb44eSRafael J. Wysocki #ifdef arch_scale_freq_capacity 21059bdcb44eSRafael J. Wysocki #ifndef arch_scale_freq_invariant 21069bdcb44eSRafael J. Wysocki #define arch_scale_freq_invariant() (true) 21079bdcb44eSRafael J. Wysocki #endif 21089bdcb44eSRafael J. Wysocki #else /* arch_scale_freq_capacity */ 21099bdcb44eSRafael J. Wysocki #define arch_scale_freq_invariant() (false) 21109bdcb44eSRafael J. Wysocki #endif 2111d4edd662SJuri Lelli 2112794a56ebSJuri Lelli #ifdef CONFIG_CPU_FREQ_GOV_SCHEDUTIL 2113794a56ebSJuri Lelli 2114d4edd662SJuri Lelli static inline unsigned long cpu_util_dl(struct rq *rq) 2115d4edd662SJuri Lelli { 2116d4edd662SJuri Lelli return (rq->dl.running_bw * SCHED_CAPACITY_SCALE) >> BW_SHIFT; 2117d4edd662SJuri Lelli } 2118d4edd662SJuri Lelli 2119d4edd662SJuri Lelli static inline unsigned long cpu_util_cfs(struct rq *rq) 2120d4edd662SJuri Lelli { 2121d4edd662SJuri Lelli return rq->cfs.avg.util_avg; 2122d4edd662SJuri Lelli } 2123794a56ebSJuri Lelli 2124794a56ebSJuri Lelli #endif 2125