1b2441318SGreg Kroah-Hartman /* SPDX-License-Identifier: GPL-2.0 */ 297fb7a0aSIngo Molnar /* 397fb7a0aSIngo Molnar * Scheduler internal types and methods: 497fb7a0aSIngo Molnar */ 5391e43daSPeter Zijlstra #include <linux/sched.h> 6325ea10cSIngo Molnar 7dfc3401aSIngo Molnar #include <linux/sched/autogroup.h> 8e6017571SIngo Molnar #include <linux/sched/clock.h> 9325ea10cSIngo Molnar #include <linux/sched/coredump.h> 1055687da1SIngo Molnar #include <linux/sched/cpufreq.h> 11325ea10cSIngo Molnar #include <linux/sched/cputime.h> 12325ea10cSIngo Molnar #include <linux/sched/deadline.h> 13b17b0153SIngo Molnar #include <linux/sched/debug.h> 14ef8bd77fSIngo Molnar #include <linux/sched/hotplug.h> 15325ea10cSIngo Molnar #include <linux/sched/idle.h> 16325ea10cSIngo Molnar #include <linux/sched/init.h> 17325ea10cSIngo Molnar #include <linux/sched/isolation.h> 18325ea10cSIngo Molnar #include <linux/sched/jobctl.h> 19325ea10cSIngo Molnar #include <linux/sched/loadavg.h> 20325ea10cSIngo Molnar #include <linux/sched/mm.h> 21325ea10cSIngo Molnar #include <linux/sched/nohz.h> 22325ea10cSIngo Molnar #include <linux/sched/numa_balancing.h> 23325ea10cSIngo Molnar #include <linux/sched/prio.h> 24325ea10cSIngo Molnar #include <linux/sched/rt.h> 25325ea10cSIngo Molnar #include <linux/sched/signal.h> 26325ea10cSIngo Molnar #include <linux/sched/stat.h> 27325ea10cSIngo Molnar #include <linux/sched/sysctl.h> 2829930025SIngo Molnar #include <linux/sched/task.h> 2968db0cf1SIngo Molnar #include <linux/sched/task_stack.h> 30325ea10cSIngo Molnar #include <linux/sched/topology.h> 31325ea10cSIngo Molnar #include <linux/sched/user.h> 32325ea10cSIngo Molnar #include <linux/sched/wake_q.h> 33325ea10cSIngo Molnar #include <linux/sched/xacct.h> 34ef8bd77fSIngo Molnar 35325ea10cSIngo Molnar #include <uapi/linux/sched/types.h> 36325ea10cSIngo Molnar 373866e845SSteven Rostedt (Red Hat) #include <linux/binfmts.h> 38325ea10cSIngo Molnar #include <linux/blkdev.h> 39325ea10cSIngo Molnar #include <linux/compat.h> 40325ea10cSIngo Molnar #include <linux/context_tracking.h> 41325ea10cSIngo Molnar #include <linux/cpufreq.h> 42325ea10cSIngo Molnar #include <linux/cpuidle.h> 43325ea10cSIngo Molnar #include <linux/cpuset.h> 44325ea10cSIngo Molnar #include <linux/ctype.h> 45325ea10cSIngo Molnar #include <linux/debugfs.h> 46325ea10cSIngo Molnar #include <linux/delayacct.h> 47325ea10cSIngo Molnar #include <linux/init_task.h> 48325ea10cSIngo Molnar #include <linux/kprobes.h> 49325ea10cSIngo Molnar #include <linux/kthread.h> 50325ea10cSIngo Molnar #include <linux/membarrier.h> 51325ea10cSIngo Molnar #include <linux/migrate.h> 52325ea10cSIngo Molnar #include <linux/mmu_context.h> 53325ea10cSIngo Molnar #include <linux/nmi.h> 54325ea10cSIngo Molnar #include <linux/proc_fs.h> 55325ea10cSIngo Molnar #include <linux/prefetch.h> 56325ea10cSIngo Molnar #include <linux/profile.h> 57325ea10cSIngo Molnar #include <linux/rcupdate_wait.h> 58325ea10cSIngo Molnar #include <linux/security.h> 59325ea10cSIngo Molnar #include <linux/stackprotector.h> 60391e43daSPeter Zijlstra #include <linux/stop_machine.h> 61325ea10cSIngo Molnar #include <linux/suspend.h> 62325ea10cSIngo Molnar #include <linux/swait.h> 63325ea10cSIngo Molnar #include <linux/syscalls.h> 64325ea10cSIngo Molnar #include <linux/task_work.h> 65325ea10cSIngo Molnar #include <linux/tsacct_kern.h> 66325ea10cSIngo Molnar 67325ea10cSIngo Molnar #include <asm/tlb.h> 68391e43daSPeter Zijlstra 697fce777cSIngo Molnar #ifdef CONFIG_PARAVIRT 707fce777cSIngo Molnar # include <asm/paravirt.h> 717fce777cSIngo Molnar #endif 727fce777cSIngo Molnar 73391e43daSPeter Zijlstra #include "cpupri.h" 746bfd6d72SJuri Lelli #include "cpudeadline.h" 75391e43daSPeter Zijlstra 769148a3a1SPeter Zijlstra #ifdef CONFIG_SCHED_DEBUG 779148a3a1SPeter Zijlstra # define SCHED_WARN_ON(x) WARN_ONCE(x, #x) 789148a3a1SPeter Zijlstra #else 796d3aed3dSIngo Molnar # define SCHED_WARN_ON(x) ({ (void)(x), 0; }) 809148a3a1SPeter Zijlstra #endif 819148a3a1SPeter Zijlstra 8245ceebf7SPaul Gortmaker struct rq; 83442bf3aaSDaniel Lezcano struct cpuidle_state; 8445ceebf7SPaul Gortmaker 85da0c1e65SKirill Tkhai /* task_struct::on_rq states: */ 86da0c1e65SKirill Tkhai #define TASK_ON_RQ_QUEUED 1 87cca26e80SKirill Tkhai #define TASK_ON_RQ_MIGRATING 2 88da0c1e65SKirill Tkhai 89391e43daSPeter Zijlstra extern __read_mostly int scheduler_running; 90391e43daSPeter Zijlstra 9145ceebf7SPaul Gortmaker extern unsigned long calc_load_update; 9245ceebf7SPaul Gortmaker extern atomic_long_t calc_load_tasks; 9345ceebf7SPaul Gortmaker 943289bdb4SPeter Zijlstra extern void calc_global_load_tick(struct rq *this_rq); 95d60585c5SThomas Gleixner extern long calc_load_fold_active(struct rq *this_rq, long adjust); 963289bdb4SPeter Zijlstra 973289bdb4SPeter Zijlstra #ifdef CONFIG_SMP 98cee1afceSFrederic Weisbecker extern void cpu_load_update_active(struct rq *this_rq); 993289bdb4SPeter Zijlstra #else 100cee1afceSFrederic Weisbecker static inline void cpu_load_update_active(struct rq *this_rq) { } 1013289bdb4SPeter Zijlstra #endif 10245ceebf7SPaul Gortmaker 103391e43daSPeter Zijlstra /* 104391e43daSPeter Zijlstra * Helpers for converting nanosecond timing to jiffy resolution 105391e43daSPeter Zijlstra */ 106391e43daSPeter Zijlstra #define NS_TO_JIFFIES(TIME) ((unsigned long)(TIME) / (NSEC_PER_SEC / HZ)) 107391e43daSPeter Zijlstra 108cc1f4b1fSLi Zefan /* 109cc1f4b1fSLi Zefan * Increase resolution of nice-level calculations for 64-bit architectures. 110cc1f4b1fSLi Zefan * The extra resolution improves shares distribution and load balancing of 111cc1f4b1fSLi Zefan * low-weight task groups (eg. nice +19 on an autogroup), deeper taskgroup 112cc1f4b1fSLi Zefan * hierarchies, especially on larger systems. This is not a user-visible change 113cc1f4b1fSLi Zefan * and does not change the user-interface for setting shares/weights. 114cc1f4b1fSLi Zefan * 115cc1f4b1fSLi Zefan * We increase resolution only if we have enough bits to allow this increased 11697fb7a0aSIngo Molnar * resolution (i.e. 64-bit). The costs for increasing resolution when 32-bit 11797fb7a0aSIngo Molnar * are pretty high and the returns do not justify the increased costs. 1182159197dSPeter Zijlstra * 11997fb7a0aSIngo Molnar * Really only required when CONFIG_FAIR_GROUP_SCHED=y is also set, but to 12097fb7a0aSIngo Molnar * increase coverage and consistency always enable it on 64-bit platforms. 121cc1f4b1fSLi Zefan */ 1222159197dSPeter Zijlstra #ifdef CONFIG_64BIT 123172895e6SYuyang Du # define NICE_0_LOAD_SHIFT (SCHED_FIXEDPOINT_SHIFT + SCHED_FIXEDPOINT_SHIFT) 1246ecdd749SYuyang Du # define scale_load(w) ((w) << SCHED_FIXEDPOINT_SHIFT) 1256ecdd749SYuyang Du # define scale_load_down(w) ((w) >> SCHED_FIXEDPOINT_SHIFT) 126cc1f4b1fSLi Zefan #else 127172895e6SYuyang Du # define NICE_0_LOAD_SHIFT (SCHED_FIXEDPOINT_SHIFT) 128cc1f4b1fSLi Zefan # define scale_load(w) (w) 129cc1f4b1fSLi Zefan # define scale_load_down(w) (w) 130cc1f4b1fSLi Zefan #endif 131cc1f4b1fSLi Zefan 1326ecdd749SYuyang Du /* 133172895e6SYuyang Du * Task weight (visible to users) and its load (invisible to users) have 134172895e6SYuyang Du * independent resolution, but they should be well calibrated. We use 135172895e6SYuyang Du * scale_load() and scale_load_down(w) to convert between them. The 136172895e6SYuyang Du * following must be true: 137172895e6SYuyang Du * 138172895e6SYuyang Du * scale_load(sched_prio_to_weight[USER_PRIO(NICE_TO_PRIO(0))]) == NICE_0_LOAD 139172895e6SYuyang Du * 1406ecdd749SYuyang Du */ 141172895e6SYuyang Du #define NICE_0_LOAD (1L << NICE_0_LOAD_SHIFT) 142391e43daSPeter Zijlstra 143391e43daSPeter Zijlstra /* 144332ac17eSDario Faggioli * Single value that decides SCHED_DEADLINE internal math precision. 145332ac17eSDario Faggioli * 10 -> just above 1us 146332ac17eSDario Faggioli * 9 -> just above 0.5us 147332ac17eSDario Faggioli */ 14897fb7a0aSIngo Molnar #define DL_SCALE 10 149332ac17eSDario Faggioli 150332ac17eSDario Faggioli /* 15197fb7a0aSIngo Molnar * Single value that denotes runtime == period, ie unlimited time. 152391e43daSPeter Zijlstra */ 153391e43daSPeter Zijlstra #define RUNTIME_INF ((u64)~0ULL) 154391e43daSPeter Zijlstra 15520f9cd2aSHenrik Austad static inline int idle_policy(int policy) 15620f9cd2aSHenrik Austad { 15720f9cd2aSHenrik Austad return policy == SCHED_IDLE; 15820f9cd2aSHenrik Austad } 159d50dde5aSDario Faggioli static inline int fair_policy(int policy) 160d50dde5aSDario Faggioli { 161d50dde5aSDario Faggioli return policy == SCHED_NORMAL || policy == SCHED_BATCH; 162d50dde5aSDario Faggioli } 163d50dde5aSDario Faggioli 164391e43daSPeter Zijlstra static inline int rt_policy(int policy) 165391e43daSPeter Zijlstra { 166d50dde5aSDario Faggioli return policy == SCHED_FIFO || policy == SCHED_RR; 167391e43daSPeter Zijlstra } 168391e43daSPeter Zijlstra 169aab03e05SDario Faggioli static inline int dl_policy(int policy) 170aab03e05SDario Faggioli { 171aab03e05SDario Faggioli return policy == SCHED_DEADLINE; 172aab03e05SDario Faggioli } 17320f9cd2aSHenrik Austad static inline bool valid_policy(int policy) 17420f9cd2aSHenrik Austad { 17520f9cd2aSHenrik Austad return idle_policy(policy) || fair_policy(policy) || 17620f9cd2aSHenrik Austad rt_policy(policy) || dl_policy(policy); 17720f9cd2aSHenrik Austad } 178aab03e05SDario Faggioli 179391e43daSPeter Zijlstra static inline int task_has_rt_policy(struct task_struct *p) 180391e43daSPeter Zijlstra { 181391e43daSPeter Zijlstra return rt_policy(p->policy); 182391e43daSPeter Zijlstra } 183391e43daSPeter Zijlstra 184aab03e05SDario Faggioli static inline int task_has_dl_policy(struct task_struct *p) 185aab03e05SDario Faggioli { 186aab03e05SDario Faggioli return dl_policy(p->policy); 187aab03e05SDario Faggioli } 188aab03e05SDario Faggioli 18907881166SJuri Lelli #define cap_scale(v, s) ((v)*(s) >> SCHED_CAPACITY_SHIFT) 19007881166SJuri Lelli 1912d3d891dSDario Faggioli /* 192794a56ebSJuri Lelli * !! For sched_setattr_nocheck() (kernel) only !! 193794a56ebSJuri Lelli * 194794a56ebSJuri Lelli * This is actually gross. :( 195794a56ebSJuri Lelli * 196794a56ebSJuri Lelli * It is used to make schedutil kworker(s) higher priority than SCHED_DEADLINE 197794a56ebSJuri Lelli * tasks, but still be able to sleep. We need this on platforms that cannot 198794a56ebSJuri Lelli * atomically change clock frequency. Remove once fast switching will be 199794a56ebSJuri Lelli * available on such platforms. 200794a56ebSJuri Lelli * 201794a56ebSJuri Lelli * SUGOV stands for SchedUtil GOVernor. 202794a56ebSJuri Lelli */ 203794a56ebSJuri Lelli #define SCHED_FLAG_SUGOV 0x10000000 204794a56ebSJuri Lelli 205794a56ebSJuri Lelli static inline bool dl_entity_is_special(struct sched_dl_entity *dl_se) 206794a56ebSJuri Lelli { 207794a56ebSJuri Lelli #ifdef CONFIG_CPU_FREQ_GOV_SCHEDUTIL 208794a56ebSJuri Lelli return unlikely(dl_se->flags & SCHED_FLAG_SUGOV); 209794a56ebSJuri Lelli #else 210794a56ebSJuri Lelli return false; 211794a56ebSJuri Lelli #endif 212794a56ebSJuri Lelli } 213794a56ebSJuri Lelli 214794a56ebSJuri Lelli /* 2152d3d891dSDario Faggioli * Tells if entity @a should preempt entity @b. 2162d3d891dSDario Faggioli */ 217332ac17eSDario Faggioli static inline bool 218332ac17eSDario Faggioli dl_entity_preempt(struct sched_dl_entity *a, struct sched_dl_entity *b) 2192d3d891dSDario Faggioli { 220794a56ebSJuri Lelli return dl_entity_is_special(a) || 221794a56ebSJuri Lelli dl_time_before(a->deadline, b->deadline); 2222d3d891dSDario Faggioli } 2232d3d891dSDario Faggioli 224391e43daSPeter Zijlstra /* 225391e43daSPeter Zijlstra * This is the priority-queue data structure of the RT scheduling class: 226391e43daSPeter Zijlstra */ 227391e43daSPeter Zijlstra struct rt_prio_array { 228391e43daSPeter Zijlstra DECLARE_BITMAP(bitmap, MAX_RT_PRIO+1); /* include 1 bit for delimiter */ 229391e43daSPeter Zijlstra struct list_head queue[MAX_RT_PRIO]; 230391e43daSPeter Zijlstra }; 231391e43daSPeter Zijlstra 232391e43daSPeter Zijlstra struct rt_bandwidth { 233391e43daSPeter Zijlstra /* nests inside the rq lock: */ 234391e43daSPeter Zijlstra raw_spinlock_t rt_runtime_lock; 235391e43daSPeter Zijlstra ktime_t rt_period; 236391e43daSPeter Zijlstra u64 rt_runtime; 237391e43daSPeter Zijlstra struct hrtimer rt_period_timer; 2384cfafd30SPeter Zijlstra unsigned int rt_period_active; 239391e43daSPeter Zijlstra }; 240a5e7be3bSJuri Lelli 241a5e7be3bSJuri Lelli void __dl_clear_params(struct task_struct *p); 242a5e7be3bSJuri Lelli 243332ac17eSDario Faggioli /* 244332ac17eSDario Faggioli * To keep the bandwidth of -deadline tasks and groups under control 245332ac17eSDario Faggioli * we need some place where: 246332ac17eSDario Faggioli * - store the maximum -deadline bandwidth of the system (the group); 247332ac17eSDario Faggioli * - cache the fraction of that bandwidth that is currently allocated. 248332ac17eSDario Faggioli * 249332ac17eSDario Faggioli * This is all done in the data structure below. It is similar to the 250332ac17eSDario Faggioli * one used for RT-throttling (rt_bandwidth), with the main difference 251332ac17eSDario Faggioli * that, since here we are only interested in admission control, we 252332ac17eSDario Faggioli * do not decrease any runtime while the group "executes", neither we 253332ac17eSDario Faggioli * need a timer to replenish it. 254332ac17eSDario Faggioli * 255332ac17eSDario Faggioli * With respect to SMP, the bandwidth is given on a per-CPU basis, 256332ac17eSDario Faggioli * meaning that: 257332ac17eSDario Faggioli * - dl_bw (< 100%) is the bandwidth of the system (group) on each CPU; 258332ac17eSDario Faggioli * - dl_total_bw array contains, in the i-eth element, the currently 259332ac17eSDario Faggioli * allocated bandwidth on the i-eth CPU. 260332ac17eSDario Faggioli * Moreover, groups consume bandwidth on each CPU, while tasks only 261332ac17eSDario Faggioli * consume bandwidth on the CPU they're running on. 262332ac17eSDario Faggioli * Finally, dl_total_bw_cpu is used to cache the index of dl_total_bw 263332ac17eSDario Faggioli * that will be shown the next time the proc or cgroup controls will 264332ac17eSDario Faggioli * be red. It on its turn can be changed by writing on its own 265332ac17eSDario Faggioli * control. 266332ac17eSDario Faggioli */ 267332ac17eSDario Faggioli struct dl_bandwidth { 268332ac17eSDario Faggioli raw_spinlock_t dl_runtime_lock; 269332ac17eSDario Faggioli u64 dl_runtime; 270332ac17eSDario Faggioli u64 dl_period; 271332ac17eSDario Faggioli }; 272332ac17eSDario Faggioli 273332ac17eSDario Faggioli static inline int dl_bandwidth_enabled(void) 274332ac17eSDario Faggioli { 2751724813dSPeter Zijlstra return sysctl_sched_rt_runtime >= 0; 276332ac17eSDario Faggioli } 277332ac17eSDario Faggioli 278332ac17eSDario Faggioli struct dl_bw { 279332ac17eSDario Faggioli raw_spinlock_t lock; 28097fb7a0aSIngo Molnar u64 bw; 28197fb7a0aSIngo Molnar u64 total_bw; 282332ac17eSDario Faggioli }; 283332ac17eSDario Faggioli 284daec5798SLuca Abeni static inline void __dl_update(struct dl_bw *dl_b, s64 bw); 285daec5798SLuca Abeni 2867f51412aSJuri Lelli static inline 2878c0944ceSPeter Zijlstra void __dl_sub(struct dl_bw *dl_b, u64 tsk_bw, int cpus) 2887f51412aSJuri Lelli { 2897f51412aSJuri Lelli dl_b->total_bw -= tsk_bw; 290daec5798SLuca Abeni __dl_update(dl_b, (s32)tsk_bw / cpus); 2917f51412aSJuri Lelli } 2927f51412aSJuri Lelli 2937f51412aSJuri Lelli static inline 294daec5798SLuca Abeni void __dl_add(struct dl_bw *dl_b, u64 tsk_bw, int cpus) 2957f51412aSJuri Lelli { 2967f51412aSJuri Lelli dl_b->total_bw += tsk_bw; 297daec5798SLuca Abeni __dl_update(dl_b, -((s32)tsk_bw / cpus)); 2987f51412aSJuri Lelli } 2997f51412aSJuri Lelli 3007f51412aSJuri Lelli static inline 3017f51412aSJuri Lelli bool __dl_overflow(struct dl_bw *dl_b, int cpus, u64 old_bw, u64 new_bw) 3027f51412aSJuri Lelli { 3037f51412aSJuri Lelli return dl_b->bw != -1 && 3047f51412aSJuri Lelli dl_b->bw * cpus < dl_b->total_bw - old_bw + new_bw; 3057f51412aSJuri Lelli } 3067f51412aSJuri Lelli 30797fb7a0aSIngo Molnar extern void dl_change_utilization(struct task_struct *p, u64 new_bw); 308f2cb1360SIngo Molnar extern void init_dl_bw(struct dl_bw *dl_b); 30906a76fe0SNicolas Pitre extern int sched_dl_global_validate(void); 31006a76fe0SNicolas Pitre extern void sched_dl_do_global(void); 31197fb7a0aSIngo Molnar extern int sched_dl_overflow(struct task_struct *p, int policy, const struct sched_attr *attr); 31206a76fe0SNicolas Pitre extern void __setparam_dl(struct task_struct *p, const struct sched_attr *attr); 31306a76fe0SNicolas Pitre extern void __getparam_dl(struct task_struct *p, struct sched_attr *attr); 31406a76fe0SNicolas Pitre extern bool __checkparam_dl(const struct sched_attr *attr); 31506a76fe0SNicolas Pitre extern bool dl_param_changed(struct task_struct *p, const struct sched_attr *attr); 31697fb7a0aSIngo Molnar extern int dl_task_can_attach(struct task_struct *p, const struct cpumask *cs_cpus_allowed); 31797fb7a0aSIngo Molnar extern int dl_cpuset_cpumask_can_shrink(const struct cpumask *cur, const struct cpumask *trial); 31806a76fe0SNicolas Pitre extern bool dl_cpu_busy(unsigned int cpu); 319391e43daSPeter Zijlstra 320391e43daSPeter Zijlstra #ifdef CONFIG_CGROUP_SCHED 321391e43daSPeter Zijlstra 322391e43daSPeter Zijlstra #include <linux/cgroup.h> 323391e43daSPeter Zijlstra 324391e43daSPeter Zijlstra struct cfs_rq; 325391e43daSPeter Zijlstra struct rt_rq; 326391e43daSPeter Zijlstra 32735cf4e50SMike Galbraith extern struct list_head task_groups; 328391e43daSPeter Zijlstra 329391e43daSPeter Zijlstra struct cfs_bandwidth { 330391e43daSPeter Zijlstra #ifdef CONFIG_CFS_BANDWIDTH 331391e43daSPeter Zijlstra raw_spinlock_t lock; 332391e43daSPeter Zijlstra ktime_t period; 33397fb7a0aSIngo Molnar u64 quota; 33497fb7a0aSIngo Molnar u64 runtime; 3359c58c79aSZhihui Zhang s64 hierarchical_quota; 336391e43daSPeter Zijlstra u64 runtime_expires; 337512ac999SXunlei Pang int expires_seq; 338391e43daSPeter Zijlstra 339512ac999SXunlei Pang short idle; 340512ac999SXunlei Pang short period_active; 34197fb7a0aSIngo Molnar struct hrtimer period_timer; 34297fb7a0aSIngo Molnar struct hrtimer slack_timer; 343391e43daSPeter Zijlstra struct list_head throttled_cfs_rq; 344391e43daSPeter Zijlstra 34597fb7a0aSIngo Molnar /* Statistics: */ 34697fb7a0aSIngo Molnar int nr_periods; 34797fb7a0aSIngo Molnar int nr_throttled; 348391e43daSPeter Zijlstra u64 throttled_time; 349391e43daSPeter Zijlstra #endif 350391e43daSPeter Zijlstra }; 351391e43daSPeter Zijlstra 35297fb7a0aSIngo Molnar /* Task group related information */ 353391e43daSPeter Zijlstra struct task_group { 354391e43daSPeter Zijlstra struct cgroup_subsys_state css; 355391e43daSPeter Zijlstra 356391e43daSPeter Zijlstra #ifdef CONFIG_FAIR_GROUP_SCHED 35797fb7a0aSIngo Molnar /* schedulable entities of this group on each CPU */ 358391e43daSPeter Zijlstra struct sched_entity **se; 35997fb7a0aSIngo Molnar /* runqueue "owned" by this group on each CPU */ 360391e43daSPeter Zijlstra struct cfs_rq **cfs_rq; 361391e43daSPeter Zijlstra unsigned long shares; 362391e43daSPeter Zijlstra 363fa6bddebSAlex Shi #ifdef CONFIG_SMP 364b0367629SWaiman Long /* 365b0367629SWaiman Long * load_avg can be heavily contended at clock tick time, so put 366b0367629SWaiman Long * it in its own cacheline separated from the fields above which 367b0367629SWaiman Long * will also be accessed at each tick. 368b0367629SWaiman Long */ 369b0367629SWaiman Long atomic_long_t load_avg ____cacheline_aligned; 370391e43daSPeter Zijlstra #endif 371fa6bddebSAlex Shi #endif 372391e43daSPeter Zijlstra 373391e43daSPeter Zijlstra #ifdef CONFIG_RT_GROUP_SCHED 374391e43daSPeter Zijlstra struct sched_rt_entity **rt_se; 375391e43daSPeter Zijlstra struct rt_rq **rt_rq; 376391e43daSPeter Zijlstra 377391e43daSPeter Zijlstra struct rt_bandwidth rt_bandwidth; 378391e43daSPeter Zijlstra #endif 379391e43daSPeter Zijlstra 380391e43daSPeter Zijlstra struct rcu_head rcu; 381391e43daSPeter Zijlstra struct list_head list; 382391e43daSPeter Zijlstra 383391e43daSPeter Zijlstra struct task_group *parent; 384391e43daSPeter Zijlstra struct list_head siblings; 385391e43daSPeter Zijlstra struct list_head children; 386391e43daSPeter Zijlstra 387391e43daSPeter Zijlstra #ifdef CONFIG_SCHED_AUTOGROUP 388391e43daSPeter Zijlstra struct autogroup *autogroup; 389391e43daSPeter Zijlstra #endif 390391e43daSPeter Zijlstra 391391e43daSPeter Zijlstra struct cfs_bandwidth cfs_bandwidth; 392391e43daSPeter Zijlstra }; 393391e43daSPeter Zijlstra 394391e43daSPeter Zijlstra #ifdef CONFIG_FAIR_GROUP_SCHED 395391e43daSPeter Zijlstra #define ROOT_TASK_GROUP_LOAD NICE_0_LOAD 396391e43daSPeter Zijlstra 397391e43daSPeter Zijlstra /* 398391e43daSPeter Zijlstra * A weight of 0 or 1 can cause arithmetics problems. 399391e43daSPeter Zijlstra * A weight of a cfs_rq is the sum of weights of which entities 400391e43daSPeter Zijlstra * are queued on this cfs_rq, so a weight of a entity should not be 401391e43daSPeter Zijlstra * too large, so as the shares value of a task group. 402391e43daSPeter Zijlstra * (The default weight is 1024 - so there's no practical 403391e43daSPeter Zijlstra * limitation from this.) 404391e43daSPeter Zijlstra */ 405391e43daSPeter Zijlstra #define MIN_SHARES (1UL << 1) 406391e43daSPeter Zijlstra #define MAX_SHARES (1UL << 18) 407391e43daSPeter Zijlstra #endif 408391e43daSPeter Zijlstra 409391e43daSPeter Zijlstra typedef int (*tg_visitor)(struct task_group *, void *); 410391e43daSPeter Zijlstra 411391e43daSPeter Zijlstra extern int walk_tg_tree_from(struct task_group *from, 412391e43daSPeter Zijlstra tg_visitor down, tg_visitor up, void *data); 413391e43daSPeter Zijlstra 414391e43daSPeter Zijlstra /* 415391e43daSPeter Zijlstra * Iterate the full tree, calling @down when first entering a node and @up when 416391e43daSPeter Zijlstra * leaving it for the final time. 417391e43daSPeter Zijlstra * 418391e43daSPeter Zijlstra * Caller must hold rcu_lock or sufficient equivalent. 419391e43daSPeter Zijlstra */ 420391e43daSPeter Zijlstra static inline int walk_tg_tree(tg_visitor down, tg_visitor up, void *data) 421391e43daSPeter Zijlstra { 422391e43daSPeter Zijlstra return walk_tg_tree_from(&root_task_group, down, up, data); 423391e43daSPeter Zijlstra } 424391e43daSPeter Zijlstra 425391e43daSPeter Zijlstra extern int tg_nop(struct task_group *tg, void *data); 426391e43daSPeter Zijlstra 427391e43daSPeter Zijlstra extern void free_fair_sched_group(struct task_group *tg); 428391e43daSPeter Zijlstra extern int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent); 4298663e24dSPeter Zijlstra extern void online_fair_sched_group(struct task_group *tg); 4306fe1f348SPeter Zijlstra extern void unregister_fair_sched_group(struct task_group *tg); 431391e43daSPeter Zijlstra extern void init_tg_cfs_entry(struct task_group *tg, struct cfs_rq *cfs_rq, 432391e43daSPeter Zijlstra struct sched_entity *se, int cpu, 433391e43daSPeter Zijlstra struct sched_entity *parent); 434391e43daSPeter Zijlstra extern void init_cfs_bandwidth(struct cfs_bandwidth *cfs_b); 435391e43daSPeter Zijlstra 436391e43daSPeter Zijlstra extern void __refill_cfs_bandwidth_runtime(struct cfs_bandwidth *cfs_b); 43777a4d1a1SPeter Zijlstra extern void start_cfs_bandwidth(struct cfs_bandwidth *cfs_b); 438391e43daSPeter Zijlstra extern void unthrottle_cfs_rq(struct cfs_rq *cfs_rq); 439391e43daSPeter Zijlstra 440391e43daSPeter Zijlstra extern void free_rt_sched_group(struct task_group *tg); 441391e43daSPeter Zijlstra extern int alloc_rt_sched_group(struct task_group *tg, struct task_group *parent); 442391e43daSPeter Zijlstra extern void init_tg_rt_entry(struct task_group *tg, struct rt_rq *rt_rq, 443391e43daSPeter Zijlstra struct sched_rt_entity *rt_se, int cpu, 444391e43daSPeter Zijlstra struct sched_rt_entity *parent); 4458887cd99SNicolas Pitre extern int sched_group_set_rt_runtime(struct task_group *tg, long rt_runtime_us); 4468887cd99SNicolas Pitre extern int sched_group_set_rt_period(struct task_group *tg, u64 rt_period_us); 4478887cd99SNicolas Pitre extern long sched_group_rt_runtime(struct task_group *tg); 4488887cd99SNicolas Pitre extern long sched_group_rt_period(struct task_group *tg); 4498887cd99SNicolas Pitre extern int sched_rt_can_attach(struct task_group *tg, struct task_struct *tsk); 450391e43daSPeter Zijlstra 45125cc7da7SLi Zefan extern struct task_group *sched_create_group(struct task_group *parent); 45225cc7da7SLi Zefan extern void sched_online_group(struct task_group *tg, 45325cc7da7SLi Zefan struct task_group *parent); 45425cc7da7SLi Zefan extern void sched_destroy_group(struct task_group *tg); 45525cc7da7SLi Zefan extern void sched_offline_group(struct task_group *tg); 45625cc7da7SLi Zefan 45725cc7da7SLi Zefan extern void sched_move_task(struct task_struct *tsk); 45825cc7da7SLi Zefan 45925cc7da7SLi Zefan #ifdef CONFIG_FAIR_GROUP_SCHED 46025cc7da7SLi Zefan extern int sched_group_set_shares(struct task_group *tg, unsigned long shares); 461ad936d86SByungchul Park 462ad936d86SByungchul Park #ifdef CONFIG_SMP 463ad936d86SByungchul Park extern void set_task_rq_fair(struct sched_entity *se, 464ad936d86SByungchul Park struct cfs_rq *prev, struct cfs_rq *next); 465ad936d86SByungchul Park #else /* !CONFIG_SMP */ 466ad936d86SByungchul Park static inline void set_task_rq_fair(struct sched_entity *se, 467ad936d86SByungchul Park struct cfs_rq *prev, struct cfs_rq *next) { } 468ad936d86SByungchul Park #endif /* CONFIG_SMP */ 469ad936d86SByungchul Park #endif /* CONFIG_FAIR_GROUP_SCHED */ 47025cc7da7SLi Zefan 471391e43daSPeter Zijlstra #else /* CONFIG_CGROUP_SCHED */ 472391e43daSPeter Zijlstra 473391e43daSPeter Zijlstra struct cfs_bandwidth { }; 474391e43daSPeter Zijlstra 475391e43daSPeter Zijlstra #endif /* CONFIG_CGROUP_SCHED */ 476391e43daSPeter Zijlstra 477391e43daSPeter Zijlstra /* CFS-related fields in a runqueue */ 478391e43daSPeter Zijlstra struct cfs_rq { 479391e43daSPeter Zijlstra struct load_weight load; 4801ea6c46aSPeter Zijlstra unsigned long runnable_weight; 48197fb7a0aSIngo Molnar unsigned int nr_running; 48297fb7a0aSIngo Molnar unsigned int h_nr_running; 483391e43daSPeter Zijlstra 484391e43daSPeter Zijlstra u64 exec_clock; 485391e43daSPeter Zijlstra u64 min_vruntime; 486391e43daSPeter Zijlstra #ifndef CONFIG_64BIT 487391e43daSPeter Zijlstra u64 min_vruntime_copy; 488391e43daSPeter Zijlstra #endif 489391e43daSPeter Zijlstra 490bfb06889SDavidlohr Bueso struct rb_root_cached tasks_timeline; 491391e43daSPeter Zijlstra 492391e43daSPeter Zijlstra /* 493391e43daSPeter Zijlstra * 'curr' points to currently running entity on this cfs_rq. 494391e43daSPeter Zijlstra * It is set to NULL otherwise (i.e when none are currently running). 495391e43daSPeter Zijlstra */ 49697fb7a0aSIngo Molnar struct sched_entity *curr; 49797fb7a0aSIngo Molnar struct sched_entity *next; 49897fb7a0aSIngo Molnar struct sched_entity *last; 49997fb7a0aSIngo Molnar struct sched_entity *skip; 500391e43daSPeter Zijlstra 501391e43daSPeter Zijlstra #ifdef CONFIG_SCHED_DEBUG 502391e43daSPeter Zijlstra unsigned int nr_spread_over; 503391e43daSPeter Zijlstra #endif 504391e43daSPeter Zijlstra 5052dac754eSPaul Turner #ifdef CONFIG_SMP 5062dac754eSPaul Turner /* 5079d89c257SYuyang Du * CFS load tracking 5082dac754eSPaul Turner */ 5099d89c257SYuyang Du struct sched_avg avg; 5102a2f5d4eSPeter Zijlstra #ifndef CONFIG_64BIT 5112a2f5d4eSPeter Zijlstra u64 load_last_update_time_copy; 5122a2f5d4eSPeter Zijlstra #endif 5132a2f5d4eSPeter Zijlstra struct { 5142a2f5d4eSPeter Zijlstra raw_spinlock_t lock ____cacheline_aligned; 5152a2f5d4eSPeter Zijlstra int nr; 5162a2f5d4eSPeter Zijlstra unsigned long load_avg; 5172a2f5d4eSPeter Zijlstra unsigned long util_avg; 5180e2d2aaaSPeter Zijlstra unsigned long runnable_sum; 5192a2f5d4eSPeter Zijlstra } removed; 520141965c7SAlex Shi 521c566e8e9SPaul Turner #ifdef CONFIG_FAIR_GROUP_SCHED 5220e2d2aaaSPeter Zijlstra unsigned long tg_load_avg_contrib; 5230e2d2aaaSPeter Zijlstra long propagate; 5240e2d2aaaSPeter Zijlstra long prop_runnable_sum; 5250e2d2aaaSPeter Zijlstra 52682958366SPaul Turner /* 52782958366SPaul Turner * h_load = weight * f(tg) 52882958366SPaul Turner * 52982958366SPaul Turner * Where f(tg) is the recursive weight fraction assigned to 53082958366SPaul Turner * this group. 53182958366SPaul Turner */ 53282958366SPaul Turner unsigned long h_load; 53368520796SVladimir Davydov u64 last_h_load_update; 53468520796SVladimir Davydov struct sched_entity *h_load_next; 53568520796SVladimir Davydov #endif /* CONFIG_FAIR_GROUP_SCHED */ 53682958366SPaul Turner #endif /* CONFIG_SMP */ 53782958366SPaul Turner 538391e43daSPeter Zijlstra #ifdef CONFIG_FAIR_GROUP_SCHED 53997fb7a0aSIngo Molnar struct rq *rq; /* CPU runqueue to which this cfs_rq is attached */ 540391e43daSPeter Zijlstra 541391e43daSPeter Zijlstra /* 542391e43daSPeter Zijlstra * leaf cfs_rqs are those that hold tasks (lowest schedulable entity in 543391e43daSPeter Zijlstra * a hierarchy). Non-leaf lrqs hold other higher schedulable entities 544391e43daSPeter Zijlstra * (like users, containers etc.) 545391e43daSPeter Zijlstra * 54697fb7a0aSIngo Molnar * leaf_cfs_rq_list ties together list of leaf cfs_rq's in a CPU. 54797fb7a0aSIngo Molnar * This list is used during load balance. 548391e43daSPeter Zijlstra */ 549391e43daSPeter Zijlstra int on_list; 550391e43daSPeter Zijlstra struct list_head leaf_cfs_rq_list; 551391e43daSPeter Zijlstra struct task_group *tg; /* group that "owns" this runqueue */ 552391e43daSPeter Zijlstra 553391e43daSPeter Zijlstra #ifdef CONFIG_CFS_BANDWIDTH 554391e43daSPeter Zijlstra int runtime_enabled; 555512ac999SXunlei Pang int expires_seq; 556391e43daSPeter Zijlstra u64 runtime_expires; 557391e43daSPeter Zijlstra s64 runtime_remaining; 558391e43daSPeter Zijlstra 55997fb7a0aSIngo Molnar u64 throttled_clock; 56097fb7a0aSIngo Molnar u64 throttled_clock_task; 561f1b17280SPaul Turner u64 throttled_clock_task_time; 56297fb7a0aSIngo Molnar int throttled; 56397fb7a0aSIngo Molnar int throttle_count; 564391e43daSPeter Zijlstra struct list_head throttled_list; 565391e43daSPeter Zijlstra #endif /* CONFIG_CFS_BANDWIDTH */ 566391e43daSPeter Zijlstra #endif /* CONFIG_FAIR_GROUP_SCHED */ 567391e43daSPeter Zijlstra }; 568391e43daSPeter Zijlstra 569391e43daSPeter Zijlstra static inline int rt_bandwidth_enabled(void) 570391e43daSPeter Zijlstra { 571391e43daSPeter Zijlstra return sysctl_sched_rt_runtime >= 0; 572391e43daSPeter Zijlstra } 573391e43daSPeter Zijlstra 574b6366f04SSteven Rostedt /* RT IPI pull logic requires IRQ_WORK */ 5754bdced5cSSteven Rostedt (Red Hat) #if defined(CONFIG_IRQ_WORK) && defined(CONFIG_SMP) 576b6366f04SSteven Rostedt # define HAVE_RT_PUSH_IPI 577b6366f04SSteven Rostedt #endif 578b6366f04SSteven Rostedt 579391e43daSPeter Zijlstra /* Real-Time classes' related field in a runqueue: */ 580391e43daSPeter Zijlstra struct rt_rq { 581391e43daSPeter Zijlstra struct rt_prio_array active; 582c82513e5SPeter Zijlstra unsigned int rt_nr_running; 58301d36d0aSFrederic Weisbecker unsigned int rr_nr_running; 584391e43daSPeter Zijlstra #if defined CONFIG_SMP || defined CONFIG_RT_GROUP_SCHED 585391e43daSPeter Zijlstra struct { 586391e43daSPeter Zijlstra int curr; /* highest queued rt task prio */ 587391e43daSPeter Zijlstra #ifdef CONFIG_SMP 588391e43daSPeter Zijlstra int next; /* next highest */ 589391e43daSPeter Zijlstra #endif 590391e43daSPeter Zijlstra } highest_prio; 591391e43daSPeter Zijlstra #endif 592391e43daSPeter Zijlstra #ifdef CONFIG_SMP 593391e43daSPeter Zijlstra unsigned long rt_nr_migratory; 594391e43daSPeter Zijlstra unsigned long rt_nr_total; 595391e43daSPeter Zijlstra int overloaded; 596391e43daSPeter Zijlstra struct plist_head pushable_tasks; 597371bf427SVincent Guittot 598b6366f04SSteven Rostedt #endif /* CONFIG_SMP */ 599f4ebcbc0SKirill Tkhai int rt_queued; 600f4ebcbc0SKirill Tkhai 601391e43daSPeter Zijlstra int rt_throttled; 602391e43daSPeter Zijlstra u64 rt_time; 603391e43daSPeter Zijlstra u64 rt_runtime; 604391e43daSPeter Zijlstra /* Nests inside the rq lock: */ 605391e43daSPeter Zijlstra raw_spinlock_t rt_runtime_lock; 606391e43daSPeter Zijlstra 607391e43daSPeter Zijlstra #ifdef CONFIG_RT_GROUP_SCHED 608391e43daSPeter Zijlstra unsigned long rt_nr_boosted; 609391e43daSPeter Zijlstra 610391e43daSPeter Zijlstra struct rq *rq; 611391e43daSPeter Zijlstra struct task_group *tg; 612391e43daSPeter Zijlstra #endif 613391e43daSPeter Zijlstra }; 614391e43daSPeter Zijlstra 615296b2ffeSVincent Guittot static inline bool rt_rq_is_runnable(struct rt_rq *rt_rq) 616296b2ffeSVincent Guittot { 617296b2ffeSVincent Guittot return rt_rq->rt_queued && rt_rq->rt_nr_running; 618296b2ffeSVincent Guittot } 619296b2ffeSVincent Guittot 620aab03e05SDario Faggioli /* Deadline class' related fields in a runqueue */ 621aab03e05SDario Faggioli struct dl_rq { 622aab03e05SDario Faggioli /* runqueue is an rbtree, ordered by deadline */ 6232161573eSDavidlohr Bueso struct rb_root_cached root; 624aab03e05SDario Faggioli 625aab03e05SDario Faggioli unsigned long dl_nr_running; 6261baca4ceSJuri Lelli 6271baca4ceSJuri Lelli #ifdef CONFIG_SMP 6281baca4ceSJuri Lelli /* 6291baca4ceSJuri Lelli * Deadline values of the currently executing and the 6301baca4ceSJuri Lelli * earliest ready task on this rq. Caching these facilitates 6311baca4ceSJuri Lelli * the decision wether or not a ready but not running task 6321baca4ceSJuri Lelli * should migrate somewhere else. 6331baca4ceSJuri Lelli */ 6341baca4ceSJuri Lelli struct { 6351baca4ceSJuri Lelli u64 curr; 6361baca4ceSJuri Lelli u64 next; 6371baca4ceSJuri Lelli } earliest_dl; 6381baca4ceSJuri Lelli 6391baca4ceSJuri Lelli unsigned long dl_nr_migratory; 6401baca4ceSJuri Lelli int overloaded; 6411baca4ceSJuri Lelli 6421baca4ceSJuri Lelli /* 6431baca4ceSJuri Lelli * Tasks on this rq that can be pushed away. They are kept in 6441baca4ceSJuri Lelli * an rb-tree, ordered by tasks' deadlines, with caching 6451baca4ceSJuri Lelli * of the leftmost (earliest deadline) element. 6461baca4ceSJuri Lelli */ 6472161573eSDavidlohr Bueso struct rb_root_cached pushable_dl_tasks_root; 648332ac17eSDario Faggioli #else 649332ac17eSDario Faggioli struct dl_bw dl_bw; 6501baca4ceSJuri Lelli #endif 651e36d8677SLuca Abeni /* 652e36d8677SLuca Abeni * "Active utilization" for this runqueue: increased when a 653e36d8677SLuca Abeni * task wakes up (becomes TASK_RUNNING) and decreased when a 654e36d8677SLuca Abeni * task blocks 655e36d8677SLuca Abeni */ 656e36d8677SLuca Abeni u64 running_bw; 6574da3abceSLuca Abeni 6584da3abceSLuca Abeni /* 6598fd27231SLuca Abeni * Utilization of the tasks "assigned" to this runqueue (including 6608fd27231SLuca Abeni * the tasks that are in runqueue and the tasks that executed on this 6618fd27231SLuca Abeni * CPU and blocked). Increased when a task moves to this runqueue, and 6628fd27231SLuca Abeni * decreased when the task moves away (migrates, changes scheduling 6638fd27231SLuca Abeni * policy, or terminates). 6648fd27231SLuca Abeni * This is needed to compute the "inactive utilization" for the 6658fd27231SLuca Abeni * runqueue (inactive utilization = this_bw - running_bw). 6668fd27231SLuca Abeni */ 6678fd27231SLuca Abeni u64 this_bw; 668daec5798SLuca Abeni u64 extra_bw; 6698fd27231SLuca Abeni 6708fd27231SLuca Abeni /* 6714da3abceSLuca Abeni * Inverse of the fraction of CPU utilization that can be reclaimed 6724da3abceSLuca Abeni * by the GRUB algorithm. 6734da3abceSLuca Abeni */ 6744da3abceSLuca Abeni u64 bw_ratio; 675aab03e05SDario Faggioli }; 676aab03e05SDario Faggioli 677c0796298SVincent Guittot #ifdef CONFIG_FAIR_GROUP_SCHED 678c0796298SVincent Guittot /* An entity is a task if it doesn't "own" a runqueue */ 679c0796298SVincent Guittot #define entity_is_task(se) (!se->my_q) 680c0796298SVincent Guittot #else 681c0796298SVincent Guittot #define entity_is_task(se) 1 682c0796298SVincent Guittot #endif 683c0796298SVincent Guittot 684391e43daSPeter Zijlstra #ifdef CONFIG_SMP 685c0796298SVincent Guittot /* 686c0796298SVincent Guittot * XXX we want to get rid of these helpers and use the full load resolution. 687c0796298SVincent Guittot */ 688c0796298SVincent Guittot static inline long se_weight(struct sched_entity *se) 689c0796298SVincent Guittot { 690c0796298SVincent Guittot return scale_load_down(se->load.weight); 691c0796298SVincent Guittot } 692c0796298SVincent Guittot 693c0796298SVincent Guittot static inline long se_runnable(struct sched_entity *se) 694c0796298SVincent Guittot { 695c0796298SVincent Guittot return scale_load_down(se->runnable_weight); 696c0796298SVincent Guittot } 697391e43daSPeter Zijlstra 698afe06efdSTim Chen static inline bool sched_asym_prefer(int a, int b) 699afe06efdSTim Chen { 700afe06efdSTim Chen return arch_asym_cpu_priority(a) > arch_asym_cpu_priority(b); 701afe06efdSTim Chen } 702afe06efdSTim Chen 703391e43daSPeter Zijlstra /* 704391e43daSPeter Zijlstra * We add the notion of a root-domain which will be used to define per-domain 705391e43daSPeter Zijlstra * variables. Each exclusive cpuset essentially defines an island domain by 70697fb7a0aSIngo Molnar * fully partitioning the member CPUs from any other cpuset. Whenever a new 707391e43daSPeter Zijlstra * exclusive cpuset is created, we also create and attach a new root-domain 708391e43daSPeter Zijlstra * object. 709391e43daSPeter Zijlstra * 710391e43daSPeter Zijlstra */ 711391e43daSPeter Zijlstra struct root_domain { 712391e43daSPeter Zijlstra atomic_t refcount; 713391e43daSPeter Zijlstra atomic_t rto_count; 714391e43daSPeter Zijlstra struct rcu_head rcu; 715391e43daSPeter Zijlstra cpumask_var_t span; 716391e43daSPeter Zijlstra cpumask_var_t online; 717391e43daSPeter Zijlstra 718757ffdd7SValentin Schneider /* 719757ffdd7SValentin Schneider * Indicate pullable load on at least one CPU, e.g: 720757ffdd7SValentin Schneider * - More than one runnable task 721757ffdd7SValentin Schneider * - Running task is misfit 722757ffdd7SValentin Schneider */ 723575638d1SValentin Schneider int overload; 7244486edd1STim Chen 725391e43daSPeter Zijlstra /* 7261baca4ceSJuri Lelli * The bit corresponding to a CPU gets set here if such CPU has more 7271baca4ceSJuri Lelli * than one runnable -deadline task (as it is below for RT tasks). 7281baca4ceSJuri Lelli */ 7291baca4ceSJuri Lelli cpumask_var_t dlo_mask; 7301baca4ceSJuri Lelli atomic_t dlo_count; 731332ac17eSDario Faggioli struct dl_bw dl_bw; 7326bfd6d72SJuri Lelli struct cpudl cpudl; 7331baca4ceSJuri Lelli 7344bdced5cSSteven Rostedt (Red Hat) #ifdef HAVE_RT_PUSH_IPI 7354bdced5cSSteven Rostedt (Red Hat) /* 7364bdced5cSSteven Rostedt (Red Hat) * For IPI pull requests, loop across the rto_mask. 7374bdced5cSSteven Rostedt (Red Hat) */ 7384bdced5cSSteven Rostedt (Red Hat) struct irq_work rto_push_work; 7394bdced5cSSteven Rostedt (Red Hat) raw_spinlock_t rto_lock; 7404bdced5cSSteven Rostedt (Red Hat) /* These are only updated and read within rto_lock */ 7414bdced5cSSteven Rostedt (Red Hat) int rto_loop; 7424bdced5cSSteven Rostedt (Red Hat) int rto_cpu; 7434bdced5cSSteven Rostedt (Red Hat) /* These atomics are updated outside of a lock */ 7444bdced5cSSteven Rostedt (Red Hat) atomic_t rto_loop_next; 7454bdced5cSSteven Rostedt (Red Hat) atomic_t rto_loop_start; 7464bdced5cSSteven Rostedt (Red Hat) #endif 7471baca4ceSJuri Lelli /* 748391e43daSPeter Zijlstra * The "RT overload" flag: it gets set if a CPU has more than 749391e43daSPeter Zijlstra * one runnable RT task. 750391e43daSPeter Zijlstra */ 751391e43daSPeter Zijlstra cpumask_var_t rto_mask; 752391e43daSPeter Zijlstra struct cpupri cpupri; 753cd92bfd3SDietmar Eggemann 754cd92bfd3SDietmar Eggemann unsigned long max_cpu_capacity; 755391e43daSPeter Zijlstra }; 756391e43daSPeter Zijlstra 757391e43daSPeter Zijlstra extern struct root_domain def_root_domain; 758f2cb1360SIngo Molnar extern struct mutex sched_domains_mutex; 759f2cb1360SIngo Molnar 760f2cb1360SIngo Molnar extern void init_defrootdomain(void); 7618d5dc512SPeter Zijlstra extern int sched_init_domains(const struct cpumask *cpu_map); 762f2cb1360SIngo Molnar extern void rq_attach_root(struct rq *rq, struct root_domain *rd); 763364f5665SSteven Rostedt (VMware) extern void sched_get_rd(struct root_domain *rd); 764364f5665SSteven Rostedt (VMware) extern void sched_put_rd(struct root_domain *rd); 765391e43daSPeter Zijlstra 7664bdced5cSSteven Rostedt (Red Hat) #ifdef HAVE_RT_PUSH_IPI 7674bdced5cSSteven Rostedt (Red Hat) extern void rto_push_irq_work_func(struct irq_work *work); 7684bdced5cSSteven Rostedt (Red Hat) #endif 769391e43daSPeter Zijlstra #endif /* CONFIG_SMP */ 770391e43daSPeter Zijlstra 771391e43daSPeter Zijlstra /* 772391e43daSPeter Zijlstra * This is the main, per-CPU runqueue data structure. 773391e43daSPeter Zijlstra * 774391e43daSPeter Zijlstra * Locking rule: those places that want to lock multiple runqueues 775391e43daSPeter Zijlstra * (such as the load balancing or the thread migration code), lock 776391e43daSPeter Zijlstra * acquire operations must be ordered by ascending &runqueue. 777391e43daSPeter Zijlstra */ 778391e43daSPeter Zijlstra struct rq { 779391e43daSPeter Zijlstra /* runqueue lock: */ 780391e43daSPeter Zijlstra raw_spinlock_t lock; 781391e43daSPeter Zijlstra 782391e43daSPeter Zijlstra /* 783391e43daSPeter Zijlstra * nr_running and cpu_load should be in the same cacheline because 784391e43daSPeter Zijlstra * remote CPUs use both these fields when doing load calculation. 785391e43daSPeter Zijlstra */ 786c82513e5SPeter Zijlstra unsigned int nr_running; 7870ec8aa00SPeter Zijlstra #ifdef CONFIG_NUMA_BALANCING 7880ec8aa00SPeter Zijlstra unsigned int nr_numa_running; 7890ec8aa00SPeter Zijlstra unsigned int nr_preferred_running; 7900ec8aa00SPeter Zijlstra #endif 791391e43daSPeter Zijlstra #define CPU_LOAD_IDX_MAX 5 792391e43daSPeter Zijlstra unsigned long cpu_load[CPU_LOAD_IDX_MAX]; 7933451d024SFrederic Weisbecker #ifdef CONFIG_NO_HZ_COMMON 7949fd81dd5SFrederic Weisbecker #ifdef CONFIG_SMP 7959fd81dd5SFrederic Weisbecker unsigned long last_load_update_tick; 796e022e0d3SPeter Zijlstra unsigned long last_blocked_load_update_tick; 797f643ea22SVincent Guittot unsigned int has_blocked_load; 7989fd81dd5SFrederic Weisbecker #endif /* CONFIG_SMP */ 79900357f5eSPeter Zijlstra unsigned int nohz_tick_stopped; 800a22e47a4SPeter Zijlstra atomic_t nohz_flags; 8019fd81dd5SFrederic Weisbecker #endif /* CONFIG_NO_HZ_COMMON */ 802dcdedb24SFrederic Weisbecker 80397fb7a0aSIngo Molnar /* capture load from *all* tasks on this CPU: */ 804391e43daSPeter Zijlstra struct load_weight load; 805391e43daSPeter Zijlstra unsigned long nr_load_updates; 806391e43daSPeter Zijlstra u64 nr_switches; 807391e43daSPeter Zijlstra 808391e43daSPeter Zijlstra struct cfs_rq cfs; 809391e43daSPeter Zijlstra struct rt_rq rt; 810aab03e05SDario Faggioli struct dl_rq dl; 811391e43daSPeter Zijlstra 812391e43daSPeter Zijlstra #ifdef CONFIG_FAIR_GROUP_SCHED 81397fb7a0aSIngo Molnar /* list of leaf cfs_rq on this CPU: */ 814391e43daSPeter Zijlstra struct list_head leaf_cfs_rq_list; 8159c2791f9SVincent Guittot struct list_head *tmp_alone_branch; 816a35b6466SPeter Zijlstra #endif /* CONFIG_FAIR_GROUP_SCHED */ 817a35b6466SPeter Zijlstra 818391e43daSPeter Zijlstra /* 819391e43daSPeter Zijlstra * This is part of a global counter where only the total sum 820391e43daSPeter Zijlstra * over all CPUs matters. A task can increase this counter on 821391e43daSPeter Zijlstra * one CPU and if it got migrated afterwards it may decrease 822391e43daSPeter Zijlstra * it on another CPU. Always updated under the runqueue lock: 823391e43daSPeter Zijlstra */ 824391e43daSPeter Zijlstra unsigned long nr_uninterruptible; 825391e43daSPeter Zijlstra 82697fb7a0aSIngo Molnar struct task_struct *curr; 82797fb7a0aSIngo Molnar struct task_struct *idle; 82897fb7a0aSIngo Molnar struct task_struct *stop; 829391e43daSPeter Zijlstra unsigned long next_balance; 830391e43daSPeter Zijlstra struct mm_struct *prev_mm; 831391e43daSPeter Zijlstra 832cb42c9a3SMatt Fleming unsigned int clock_update_flags; 833391e43daSPeter Zijlstra u64 clock; 834391e43daSPeter Zijlstra u64 clock_task; 835391e43daSPeter Zijlstra 836391e43daSPeter Zijlstra atomic_t nr_iowait; 837391e43daSPeter Zijlstra 838391e43daSPeter Zijlstra #ifdef CONFIG_SMP 839391e43daSPeter Zijlstra struct root_domain *rd; 840391e43daSPeter Zijlstra struct sched_domain *sd; 841391e43daSPeter Zijlstra 842ced549faSNicolas Pitre unsigned long cpu_capacity; 843ca6d75e6SVincent Guittot unsigned long cpu_capacity_orig; 844391e43daSPeter Zijlstra 845e3fca9e7SPeter Zijlstra struct callback_head *balance_callback; 846e3fca9e7SPeter Zijlstra 847391e43daSPeter Zijlstra unsigned char idle_balance; 84897fb7a0aSIngo Molnar 8493b1baa64SMorten Rasmussen unsigned long misfit_task_load; 8503b1baa64SMorten Rasmussen 851391e43daSPeter Zijlstra /* For active balancing */ 852391e43daSPeter Zijlstra int active_balance; 853391e43daSPeter Zijlstra int push_cpu; 854391e43daSPeter Zijlstra struct cpu_stop_work active_balance_work; 85597fb7a0aSIngo Molnar 85697fb7a0aSIngo Molnar /* CPU of this runqueue: */ 857391e43daSPeter Zijlstra int cpu; 858391e43daSPeter Zijlstra int online; 859391e43daSPeter Zijlstra 860367456c7SPeter Zijlstra struct list_head cfs_tasks; 861367456c7SPeter Zijlstra 862371bf427SVincent Guittot struct sched_avg avg_rt; 8633727e0e1SVincent Guittot struct sched_avg avg_dl; 86491c27493SVincent Guittot #if defined(CONFIG_IRQ_TIME_ACCOUNTING) || defined(CONFIG_PARAVIRT_TIME_ACCOUNTING) 8652e62c474SVincent Guittot #define HAVE_SCHED_AVG_IRQ 86691c27493SVincent Guittot struct sched_avg avg_irq; 86791c27493SVincent Guittot #endif 868391e43daSPeter Zijlstra u64 idle_stamp; 869391e43daSPeter Zijlstra u64 avg_idle; 8709bd721c5SJason Low 8719bd721c5SJason Low /* This is used to determine avg_idle's max value */ 8729bd721c5SJason Low u64 max_idle_balance_cost; 873391e43daSPeter Zijlstra #endif 874391e43daSPeter Zijlstra 875391e43daSPeter Zijlstra #ifdef CONFIG_IRQ_TIME_ACCOUNTING 876391e43daSPeter Zijlstra u64 prev_irq_time; 877391e43daSPeter Zijlstra #endif 878391e43daSPeter Zijlstra #ifdef CONFIG_PARAVIRT 879391e43daSPeter Zijlstra u64 prev_steal_time; 880391e43daSPeter Zijlstra #endif 881391e43daSPeter Zijlstra #ifdef CONFIG_PARAVIRT_TIME_ACCOUNTING 882391e43daSPeter Zijlstra u64 prev_steal_time_rq; 883391e43daSPeter Zijlstra #endif 884391e43daSPeter Zijlstra 885391e43daSPeter Zijlstra /* calc_load related fields */ 886391e43daSPeter Zijlstra unsigned long calc_load_update; 887391e43daSPeter Zijlstra long calc_load_active; 888391e43daSPeter Zijlstra 889391e43daSPeter Zijlstra #ifdef CONFIG_SCHED_HRTICK 890391e43daSPeter Zijlstra #ifdef CONFIG_SMP 891391e43daSPeter Zijlstra int hrtick_csd_pending; 892966a9671SYing Huang call_single_data_t hrtick_csd; 893391e43daSPeter Zijlstra #endif 894391e43daSPeter Zijlstra struct hrtimer hrtick_timer; 895391e43daSPeter Zijlstra #endif 896391e43daSPeter Zijlstra 897391e43daSPeter Zijlstra #ifdef CONFIG_SCHEDSTATS 898391e43daSPeter Zijlstra /* latency stats */ 899391e43daSPeter Zijlstra struct sched_info rq_sched_info; 900391e43daSPeter Zijlstra unsigned long long rq_cpu_time; 901391e43daSPeter Zijlstra /* could above be rq->cfs_rq.exec_clock + rq->rt_rq.rt_runtime ? */ 902391e43daSPeter Zijlstra 903391e43daSPeter Zijlstra /* sys_sched_yield() stats */ 904391e43daSPeter Zijlstra unsigned int yld_count; 905391e43daSPeter Zijlstra 906391e43daSPeter Zijlstra /* schedule() stats */ 907391e43daSPeter Zijlstra unsigned int sched_count; 908391e43daSPeter Zijlstra unsigned int sched_goidle; 909391e43daSPeter Zijlstra 910391e43daSPeter Zijlstra /* try_to_wake_up() stats */ 911391e43daSPeter Zijlstra unsigned int ttwu_count; 912391e43daSPeter Zijlstra unsigned int ttwu_local; 913391e43daSPeter Zijlstra #endif 914391e43daSPeter Zijlstra 915391e43daSPeter Zijlstra #ifdef CONFIG_SMP 916391e43daSPeter Zijlstra struct llist_head wake_list; 917391e43daSPeter Zijlstra #endif 918442bf3aaSDaniel Lezcano 919442bf3aaSDaniel Lezcano #ifdef CONFIG_CPU_IDLE 920442bf3aaSDaniel Lezcano /* Must be inspected within a rcu lock section */ 921442bf3aaSDaniel Lezcano struct cpuidle_state *idle_state; 922442bf3aaSDaniel Lezcano #endif 923391e43daSPeter Zijlstra }; 924391e43daSPeter Zijlstra 925391e43daSPeter Zijlstra static inline int cpu_of(struct rq *rq) 926391e43daSPeter Zijlstra { 927391e43daSPeter Zijlstra #ifdef CONFIG_SMP 928391e43daSPeter Zijlstra return rq->cpu; 929391e43daSPeter Zijlstra #else 930391e43daSPeter Zijlstra return 0; 931391e43daSPeter Zijlstra #endif 932391e43daSPeter Zijlstra } 933391e43daSPeter Zijlstra 9341b568f0aSPeter Zijlstra 9351b568f0aSPeter Zijlstra #ifdef CONFIG_SCHED_SMT 9361b568f0aSPeter Zijlstra 9371b568f0aSPeter Zijlstra extern struct static_key_false sched_smt_present; 9381b568f0aSPeter Zijlstra 9391b568f0aSPeter Zijlstra extern void __update_idle_core(struct rq *rq); 9401b568f0aSPeter Zijlstra 9411b568f0aSPeter Zijlstra static inline void update_idle_core(struct rq *rq) 9421b568f0aSPeter Zijlstra { 9431b568f0aSPeter Zijlstra if (static_branch_unlikely(&sched_smt_present)) 9441b568f0aSPeter Zijlstra __update_idle_core(rq); 9451b568f0aSPeter Zijlstra } 9461b568f0aSPeter Zijlstra 9471b568f0aSPeter Zijlstra #else 9481b568f0aSPeter Zijlstra static inline void update_idle_core(struct rq *rq) { } 9491b568f0aSPeter Zijlstra #endif 9501b568f0aSPeter Zijlstra 9518b06c55bSPranith Kumar DECLARE_PER_CPU_SHARED_ALIGNED(struct rq, runqueues); 952391e43daSPeter Zijlstra 953518cd623SPeter Zijlstra #define cpu_rq(cpu) (&per_cpu(runqueues, (cpu))) 9544a32fea9SChristoph Lameter #define this_rq() this_cpu_ptr(&runqueues) 955518cd623SPeter Zijlstra #define task_rq(p) cpu_rq(task_cpu(p)) 956518cd623SPeter Zijlstra #define cpu_curr(cpu) (cpu_rq(cpu)->curr) 9574a32fea9SChristoph Lameter #define raw_rq() raw_cpu_ptr(&runqueues) 958518cd623SPeter Zijlstra 959cebde6d6SPeter Zijlstra static inline u64 __rq_clock_broken(struct rq *rq) 960cebde6d6SPeter Zijlstra { 961316c1608SJason Low return READ_ONCE(rq->clock); 962cebde6d6SPeter Zijlstra } 963cebde6d6SPeter Zijlstra 964cb42c9a3SMatt Fleming /* 965cb42c9a3SMatt Fleming * rq::clock_update_flags bits 966cb42c9a3SMatt Fleming * 967cb42c9a3SMatt Fleming * %RQCF_REQ_SKIP - will request skipping of clock update on the next 968cb42c9a3SMatt Fleming * call to __schedule(). This is an optimisation to avoid 969cb42c9a3SMatt Fleming * neighbouring rq clock updates. 970cb42c9a3SMatt Fleming * 971cb42c9a3SMatt Fleming * %RQCF_ACT_SKIP - is set from inside of __schedule() when skipping is 972cb42c9a3SMatt Fleming * in effect and calls to update_rq_clock() are being ignored. 973cb42c9a3SMatt Fleming * 974cb42c9a3SMatt Fleming * %RQCF_UPDATED - is a debug flag that indicates whether a call has been 975cb42c9a3SMatt Fleming * made to update_rq_clock() since the last time rq::lock was pinned. 976cb42c9a3SMatt Fleming * 977cb42c9a3SMatt Fleming * If inside of __schedule(), clock_update_flags will have been 978cb42c9a3SMatt Fleming * shifted left (a left shift is a cheap operation for the fast path 979cb42c9a3SMatt Fleming * to promote %RQCF_REQ_SKIP to %RQCF_ACT_SKIP), so you must use, 980cb42c9a3SMatt Fleming * 981cb42c9a3SMatt Fleming * if (rq-clock_update_flags >= RQCF_UPDATED) 982cb42c9a3SMatt Fleming * 983cb42c9a3SMatt Fleming * to check if %RQCF_UPADTED is set. It'll never be shifted more than 984cb42c9a3SMatt Fleming * one position though, because the next rq_unpin_lock() will shift it 985cb42c9a3SMatt Fleming * back. 986cb42c9a3SMatt Fleming */ 987cb42c9a3SMatt Fleming #define RQCF_REQ_SKIP 0x01 988cb42c9a3SMatt Fleming #define RQCF_ACT_SKIP 0x02 989cb42c9a3SMatt Fleming #define RQCF_UPDATED 0x04 990cb42c9a3SMatt Fleming 991cb42c9a3SMatt Fleming static inline void assert_clock_updated(struct rq *rq) 992cb42c9a3SMatt Fleming { 993cb42c9a3SMatt Fleming /* 994cb42c9a3SMatt Fleming * The only reason for not seeing a clock update since the 995cb42c9a3SMatt Fleming * last rq_pin_lock() is if we're currently skipping updates. 996cb42c9a3SMatt Fleming */ 997cb42c9a3SMatt Fleming SCHED_WARN_ON(rq->clock_update_flags < RQCF_ACT_SKIP); 998cb42c9a3SMatt Fleming } 999cb42c9a3SMatt Fleming 100078becc27SFrederic Weisbecker static inline u64 rq_clock(struct rq *rq) 100178becc27SFrederic Weisbecker { 1002cebde6d6SPeter Zijlstra lockdep_assert_held(&rq->lock); 1003cb42c9a3SMatt Fleming assert_clock_updated(rq); 1004cb42c9a3SMatt Fleming 100578becc27SFrederic Weisbecker return rq->clock; 100678becc27SFrederic Weisbecker } 100778becc27SFrederic Weisbecker 100878becc27SFrederic Weisbecker static inline u64 rq_clock_task(struct rq *rq) 100978becc27SFrederic Weisbecker { 1010cebde6d6SPeter Zijlstra lockdep_assert_held(&rq->lock); 1011cb42c9a3SMatt Fleming assert_clock_updated(rq); 1012cb42c9a3SMatt Fleming 101378becc27SFrederic Weisbecker return rq->clock_task; 101478becc27SFrederic Weisbecker } 101578becc27SFrederic Weisbecker 1016adcc8da8SDavidlohr Bueso static inline void rq_clock_skip_update(struct rq *rq) 10179edfbfedSPeter Zijlstra { 10189edfbfedSPeter Zijlstra lockdep_assert_held(&rq->lock); 1019cb42c9a3SMatt Fleming rq->clock_update_flags |= RQCF_REQ_SKIP; 1020adcc8da8SDavidlohr Bueso } 1021adcc8da8SDavidlohr Bueso 1022adcc8da8SDavidlohr Bueso /* 1023595058b6SDavidlohr Bueso * See rt task throttling, which is the only time a skip 1024adcc8da8SDavidlohr Bueso * request is cancelled. 1025adcc8da8SDavidlohr Bueso */ 1026adcc8da8SDavidlohr Bueso static inline void rq_clock_cancel_skipupdate(struct rq *rq) 1027adcc8da8SDavidlohr Bueso { 1028adcc8da8SDavidlohr Bueso lockdep_assert_held(&rq->lock); 1029cb42c9a3SMatt Fleming rq->clock_update_flags &= ~RQCF_REQ_SKIP; 10309edfbfedSPeter Zijlstra } 10319edfbfedSPeter Zijlstra 1032d8ac8971SMatt Fleming struct rq_flags { 1033d8ac8971SMatt Fleming unsigned long flags; 1034d8ac8971SMatt Fleming struct pin_cookie cookie; 1035cb42c9a3SMatt Fleming #ifdef CONFIG_SCHED_DEBUG 1036cb42c9a3SMatt Fleming /* 1037cb42c9a3SMatt Fleming * A copy of (rq::clock_update_flags & RQCF_UPDATED) for the 1038cb42c9a3SMatt Fleming * current pin context is stashed here in case it needs to be 1039cb42c9a3SMatt Fleming * restored in rq_repin_lock(). 1040cb42c9a3SMatt Fleming */ 1041cb42c9a3SMatt Fleming unsigned int clock_update_flags; 1042cb42c9a3SMatt Fleming #endif 1043d8ac8971SMatt Fleming }; 1044d8ac8971SMatt Fleming 1045d8ac8971SMatt Fleming static inline void rq_pin_lock(struct rq *rq, struct rq_flags *rf) 1046d8ac8971SMatt Fleming { 1047d8ac8971SMatt Fleming rf->cookie = lockdep_pin_lock(&rq->lock); 1048cb42c9a3SMatt Fleming 1049cb42c9a3SMatt Fleming #ifdef CONFIG_SCHED_DEBUG 1050cb42c9a3SMatt Fleming rq->clock_update_flags &= (RQCF_REQ_SKIP|RQCF_ACT_SKIP); 1051cb42c9a3SMatt Fleming rf->clock_update_flags = 0; 1052cb42c9a3SMatt Fleming #endif 1053d8ac8971SMatt Fleming } 1054d8ac8971SMatt Fleming 1055d8ac8971SMatt Fleming static inline void rq_unpin_lock(struct rq *rq, struct rq_flags *rf) 1056d8ac8971SMatt Fleming { 1057cb42c9a3SMatt Fleming #ifdef CONFIG_SCHED_DEBUG 1058cb42c9a3SMatt Fleming if (rq->clock_update_flags > RQCF_ACT_SKIP) 1059cb42c9a3SMatt Fleming rf->clock_update_flags = RQCF_UPDATED; 1060cb42c9a3SMatt Fleming #endif 1061cb42c9a3SMatt Fleming 1062d8ac8971SMatt Fleming lockdep_unpin_lock(&rq->lock, rf->cookie); 1063d8ac8971SMatt Fleming } 1064d8ac8971SMatt Fleming 1065d8ac8971SMatt Fleming static inline void rq_repin_lock(struct rq *rq, struct rq_flags *rf) 1066d8ac8971SMatt Fleming { 1067d8ac8971SMatt Fleming lockdep_repin_lock(&rq->lock, rf->cookie); 1068cb42c9a3SMatt Fleming 1069cb42c9a3SMatt Fleming #ifdef CONFIG_SCHED_DEBUG 1070cb42c9a3SMatt Fleming /* 1071cb42c9a3SMatt Fleming * Restore the value we stashed in @rf for this pin context. 1072cb42c9a3SMatt Fleming */ 1073cb42c9a3SMatt Fleming rq->clock_update_flags |= rf->clock_update_flags; 1074cb42c9a3SMatt Fleming #endif 1075d8ac8971SMatt Fleming } 1076d8ac8971SMatt Fleming 10779942f79bSRik van Riel #ifdef CONFIG_NUMA 1078e3fe70b1SRik van Riel enum numa_topology_type { 1079e3fe70b1SRik van Riel NUMA_DIRECT, 1080e3fe70b1SRik van Riel NUMA_GLUELESS_MESH, 1081e3fe70b1SRik van Riel NUMA_BACKPLANE, 1082e3fe70b1SRik van Riel }; 1083e3fe70b1SRik van Riel extern enum numa_topology_type sched_numa_topology_type; 10849942f79bSRik van Riel extern int sched_max_numa_distance; 10859942f79bSRik van Riel extern bool find_numa_distance(int distance); 10869942f79bSRik van Riel #endif 10879942f79bSRik van Riel 1088f2cb1360SIngo Molnar #ifdef CONFIG_NUMA 1089f2cb1360SIngo Molnar extern void sched_init_numa(void); 1090f2cb1360SIngo Molnar extern void sched_domains_numa_masks_set(unsigned int cpu); 1091f2cb1360SIngo Molnar extern void sched_domains_numa_masks_clear(unsigned int cpu); 1092f2cb1360SIngo Molnar #else 1093f2cb1360SIngo Molnar static inline void sched_init_numa(void) { } 1094f2cb1360SIngo Molnar static inline void sched_domains_numa_masks_set(unsigned int cpu) { } 1095f2cb1360SIngo Molnar static inline void sched_domains_numa_masks_clear(unsigned int cpu) { } 1096f2cb1360SIngo Molnar #endif 1097f2cb1360SIngo Molnar 1098f809ca9aSMel Gorman #ifdef CONFIG_NUMA_BALANCING 109944dba3d5SIulia Manda /* The regions in numa_faults array from task_struct */ 110044dba3d5SIulia Manda enum numa_faults_stats { 110144dba3d5SIulia Manda NUMA_MEM = 0, 110244dba3d5SIulia Manda NUMA_CPU, 110344dba3d5SIulia Manda NUMA_MEMBUF, 110444dba3d5SIulia Manda NUMA_CPUBUF 110544dba3d5SIulia Manda }; 11060ec8aa00SPeter Zijlstra extern void sched_setnuma(struct task_struct *p, int node); 1107e6628d5bSMel Gorman extern int migrate_task_to(struct task_struct *p, int cpu); 11080ad4e3dfSSrikar Dronamraju extern int migrate_swap(struct task_struct *p, struct task_struct *t, 11090ad4e3dfSSrikar Dronamraju int cpu, int scpu); 111013784475SMel Gorman extern void init_numa_balancing(unsigned long clone_flags, struct task_struct *p); 111113784475SMel Gorman #else 111213784475SMel Gorman static inline void 111313784475SMel Gorman init_numa_balancing(unsigned long clone_flags, struct task_struct *p) 111413784475SMel Gorman { 111513784475SMel Gorman } 1116f809ca9aSMel Gorman #endif /* CONFIG_NUMA_BALANCING */ 1117f809ca9aSMel Gorman 1118518cd623SPeter Zijlstra #ifdef CONFIG_SMP 1119518cd623SPeter Zijlstra 1120e3fca9e7SPeter Zijlstra static inline void 1121e3fca9e7SPeter Zijlstra queue_balance_callback(struct rq *rq, 1122e3fca9e7SPeter Zijlstra struct callback_head *head, 1123e3fca9e7SPeter Zijlstra void (*func)(struct rq *rq)) 1124e3fca9e7SPeter Zijlstra { 1125e3fca9e7SPeter Zijlstra lockdep_assert_held(&rq->lock); 1126e3fca9e7SPeter Zijlstra 1127e3fca9e7SPeter Zijlstra if (unlikely(head->next)) 1128e3fca9e7SPeter Zijlstra return; 1129e3fca9e7SPeter Zijlstra 1130e3fca9e7SPeter Zijlstra head->func = (void (*)(struct callback_head *))func; 1131e3fca9e7SPeter Zijlstra head->next = rq->balance_callback; 1132e3fca9e7SPeter Zijlstra rq->balance_callback = head; 1133e3fca9e7SPeter Zijlstra } 1134e3fca9e7SPeter Zijlstra 1135e3baac47SPeter Zijlstra extern void sched_ttwu_pending(void); 1136e3baac47SPeter Zijlstra 1137391e43daSPeter Zijlstra #define rcu_dereference_check_sched_domain(p) \ 1138391e43daSPeter Zijlstra rcu_dereference_check((p), \ 1139391e43daSPeter Zijlstra lockdep_is_held(&sched_domains_mutex)) 1140391e43daSPeter Zijlstra 1141391e43daSPeter Zijlstra /* 1142391e43daSPeter Zijlstra * The domain tree (rq->sd) is protected by RCU's quiescent state transition. 1143391e43daSPeter Zijlstra * See detach_destroy_domains: synchronize_sched for details. 1144391e43daSPeter Zijlstra * 1145391e43daSPeter Zijlstra * The domain tree of any CPU may only be accessed from within 1146391e43daSPeter Zijlstra * preempt-disabled sections. 1147391e43daSPeter Zijlstra */ 1148391e43daSPeter Zijlstra #define for_each_domain(cpu, __sd) \ 1149518cd623SPeter Zijlstra for (__sd = rcu_dereference_check_sched_domain(cpu_rq(cpu)->sd); \ 1150518cd623SPeter Zijlstra __sd; __sd = __sd->parent) 1151391e43daSPeter Zijlstra 115277e81365SSuresh Siddha #define for_each_lower_domain(sd) for (; sd; sd = sd->child) 115377e81365SSuresh Siddha 1154518cd623SPeter Zijlstra /** 1155518cd623SPeter Zijlstra * highest_flag_domain - Return highest sched_domain containing flag. 115697fb7a0aSIngo Molnar * @cpu: The CPU whose highest level of sched domain is to 1157518cd623SPeter Zijlstra * be returned. 1158518cd623SPeter Zijlstra * @flag: The flag to check for the highest sched_domain 115997fb7a0aSIngo Molnar * for the given CPU. 1160518cd623SPeter Zijlstra * 116197fb7a0aSIngo Molnar * Returns the highest sched_domain of a CPU which contains the given flag. 1162518cd623SPeter Zijlstra */ 1163518cd623SPeter Zijlstra static inline struct sched_domain *highest_flag_domain(int cpu, int flag) 1164518cd623SPeter Zijlstra { 1165518cd623SPeter Zijlstra struct sched_domain *sd, *hsd = NULL; 1166518cd623SPeter Zijlstra 1167518cd623SPeter Zijlstra for_each_domain(cpu, sd) { 1168518cd623SPeter Zijlstra if (!(sd->flags & flag)) 1169518cd623SPeter Zijlstra break; 1170518cd623SPeter Zijlstra hsd = sd; 1171518cd623SPeter Zijlstra } 1172518cd623SPeter Zijlstra 1173518cd623SPeter Zijlstra return hsd; 1174518cd623SPeter Zijlstra } 1175518cd623SPeter Zijlstra 1176fb13c7eeSMel Gorman static inline struct sched_domain *lowest_flag_domain(int cpu, int flag) 1177fb13c7eeSMel Gorman { 1178fb13c7eeSMel Gorman struct sched_domain *sd; 1179fb13c7eeSMel Gorman 1180fb13c7eeSMel Gorman for_each_domain(cpu, sd) { 1181fb13c7eeSMel Gorman if (sd->flags & flag) 1182fb13c7eeSMel Gorman break; 1183fb13c7eeSMel Gorman } 1184fb13c7eeSMel Gorman 1185fb13c7eeSMel Gorman return sd; 1186fb13c7eeSMel Gorman } 1187fb13c7eeSMel Gorman 1188518cd623SPeter Zijlstra DECLARE_PER_CPU(struct sched_domain *, sd_llc); 11897d9ffa89SPeter Zijlstra DECLARE_PER_CPU(int, sd_llc_size); 1190518cd623SPeter Zijlstra DECLARE_PER_CPU(int, sd_llc_id); 11910e369d75SPeter Zijlstra DECLARE_PER_CPU(struct sched_domain_shared *, sd_llc_shared); 1192fb13c7eeSMel Gorman DECLARE_PER_CPU(struct sched_domain *, sd_numa); 119337dc6b50SPreeti U Murthy DECLARE_PER_CPU(struct sched_domain *, sd_asym); 1194df054e84SMorten Rasmussen extern struct static_key_false sched_asym_cpucapacity; 1195518cd623SPeter Zijlstra 119663b2ca30SNicolas Pitre struct sched_group_capacity { 11975e6521eaSLi Zefan atomic_t ref; 11985e6521eaSLi Zefan /* 1199172895e6SYuyang Du * CPU capacity of this group, SCHED_CAPACITY_SCALE being max capacity 120063b2ca30SNicolas Pitre * for a single CPU. 12015e6521eaSLi Zefan */ 1202bf475ce0SMorten Rasmussen unsigned long capacity; 1203bf475ce0SMorten Rasmussen unsigned long min_capacity; /* Min per-CPU capacity in group */ 1204e3d6d0cbSMorten Rasmussen unsigned long max_capacity; /* Max per-CPU capacity in group */ 12055e6521eaSLi Zefan unsigned long next_update; 120663b2ca30SNicolas Pitre int imbalance; /* XXX unrelated to capacity but shared group state */ 12075e6521eaSLi Zefan 1208005f874dSPeter Zijlstra #ifdef CONFIG_SCHED_DEBUG 1209005f874dSPeter Zijlstra int id; 1210005f874dSPeter Zijlstra #endif 1211005f874dSPeter Zijlstra 121297fb7a0aSIngo Molnar unsigned long cpumask[0]; /* Balance mask */ 12135e6521eaSLi Zefan }; 12145e6521eaSLi Zefan 12155e6521eaSLi Zefan struct sched_group { 12165e6521eaSLi Zefan struct sched_group *next; /* Must be a circular list */ 12175e6521eaSLi Zefan atomic_t ref; 12185e6521eaSLi Zefan 12195e6521eaSLi Zefan unsigned int group_weight; 122063b2ca30SNicolas Pitre struct sched_group_capacity *sgc; 122197fb7a0aSIngo Molnar int asym_prefer_cpu; /* CPU of highest priority in group */ 12225e6521eaSLi Zefan 12235e6521eaSLi Zefan /* 12245e6521eaSLi Zefan * The CPUs this group covers. 12255e6521eaSLi Zefan * 12265e6521eaSLi Zefan * NOTE: this field is variable length. (Allocated dynamically 12275e6521eaSLi Zefan * by attaching extra space to the end of the structure, 12285e6521eaSLi Zefan * depending on how many CPUs the kernel has booted up with) 12295e6521eaSLi Zefan */ 12305e6521eaSLi Zefan unsigned long cpumask[0]; 12315e6521eaSLi Zefan }; 12325e6521eaSLi Zefan 1233ae4df9d6SPeter Zijlstra static inline struct cpumask *sched_group_span(struct sched_group *sg) 12345e6521eaSLi Zefan { 12355e6521eaSLi Zefan return to_cpumask(sg->cpumask); 12365e6521eaSLi Zefan } 12375e6521eaSLi Zefan 12385e6521eaSLi Zefan /* 1239e5c14b1fSPeter Zijlstra * See build_balance_mask(). 12405e6521eaSLi Zefan */ 1241e5c14b1fSPeter Zijlstra static inline struct cpumask *group_balance_mask(struct sched_group *sg) 12425e6521eaSLi Zefan { 124363b2ca30SNicolas Pitre return to_cpumask(sg->sgc->cpumask); 12445e6521eaSLi Zefan } 12455e6521eaSLi Zefan 12465e6521eaSLi Zefan /** 124797fb7a0aSIngo Molnar * group_first_cpu - Returns the first CPU in the cpumask of a sched_group. 124897fb7a0aSIngo Molnar * @group: The group whose first CPU is to be returned. 12495e6521eaSLi Zefan */ 12505e6521eaSLi Zefan static inline unsigned int group_first_cpu(struct sched_group *group) 12515e6521eaSLi Zefan { 1252ae4df9d6SPeter Zijlstra return cpumask_first(sched_group_span(group)); 12535e6521eaSLi Zefan } 12545e6521eaSLi Zefan 1255c1174876SPeter Zijlstra extern int group_balance_cpu(struct sched_group *sg); 1256c1174876SPeter Zijlstra 12573866e845SSteven Rostedt (Red Hat) #if defined(CONFIG_SCHED_DEBUG) && defined(CONFIG_SYSCTL) 12583866e845SSteven Rostedt (Red Hat) void register_sched_domain_sysctl(void); 1259bbdacdfeSPeter Zijlstra void dirty_sched_domain_sysctl(int cpu); 12603866e845SSteven Rostedt (Red Hat) void unregister_sched_domain_sysctl(void); 12613866e845SSteven Rostedt (Red Hat) #else 12623866e845SSteven Rostedt (Red Hat) static inline void register_sched_domain_sysctl(void) 12633866e845SSteven Rostedt (Red Hat) { 12643866e845SSteven Rostedt (Red Hat) } 1265bbdacdfeSPeter Zijlstra static inline void dirty_sched_domain_sysctl(int cpu) 1266bbdacdfeSPeter Zijlstra { 1267bbdacdfeSPeter Zijlstra } 12683866e845SSteven Rostedt (Red Hat) static inline void unregister_sched_domain_sysctl(void) 12693866e845SSteven Rostedt (Red Hat) { 12703866e845SSteven Rostedt (Red Hat) } 12713866e845SSteven Rostedt (Red Hat) #endif 12723866e845SSteven Rostedt (Red Hat) 1273e3baac47SPeter Zijlstra #else 1274e3baac47SPeter Zijlstra 1275e3baac47SPeter Zijlstra static inline void sched_ttwu_pending(void) { } 1276e3baac47SPeter Zijlstra 1277518cd623SPeter Zijlstra #endif /* CONFIG_SMP */ 1278391e43daSPeter Zijlstra 1279391e43daSPeter Zijlstra #include "stats.h" 12801051408fSIngo Molnar #include "autogroup.h" 1281391e43daSPeter Zijlstra 1282391e43daSPeter Zijlstra #ifdef CONFIG_CGROUP_SCHED 1283391e43daSPeter Zijlstra 1284391e43daSPeter Zijlstra /* 1285391e43daSPeter Zijlstra * Return the group to which this tasks belongs. 1286391e43daSPeter Zijlstra * 12878af01f56STejun Heo * We cannot use task_css() and friends because the cgroup subsystem 12888af01f56STejun Heo * changes that value before the cgroup_subsys::attach() method is called, 12898af01f56STejun Heo * therefore we cannot pin it and might observe the wrong value. 12908323f26cSPeter Zijlstra * 12918323f26cSPeter Zijlstra * The same is true for autogroup's p->signal->autogroup->tg, the autogroup 12928323f26cSPeter Zijlstra * core changes this before calling sched_move_task(). 12938323f26cSPeter Zijlstra * 12948323f26cSPeter Zijlstra * Instead we use a 'copy' which is updated from sched_move_task() while 12958323f26cSPeter Zijlstra * holding both task_struct::pi_lock and rq::lock. 1296391e43daSPeter Zijlstra */ 1297391e43daSPeter Zijlstra static inline struct task_group *task_group(struct task_struct *p) 1298391e43daSPeter Zijlstra { 12998323f26cSPeter Zijlstra return p->sched_task_group; 1300391e43daSPeter Zijlstra } 1301391e43daSPeter Zijlstra 1302391e43daSPeter Zijlstra /* Change a task's cfs_rq and parent entity if it moves across CPUs/groups */ 1303391e43daSPeter Zijlstra static inline void set_task_rq(struct task_struct *p, unsigned int cpu) 1304391e43daSPeter Zijlstra { 1305391e43daSPeter Zijlstra #if defined(CONFIG_FAIR_GROUP_SCHED) || defined(CONFIG_RT_GROUP_SCHED) 1306391e43daSPeter Zijlstra struct task_group *tg = task_group(p); 1307391e43daSPeter Zijlstra #endif 1308391e43daSPeter Zijlstra 1309391e43daSPeter Zijlstra #ifdef CONFIG_FAIR_GROUP_SCHED 1310ad936d86SByungchul Park set_task_rq_fair(&p->se, p->se.cfs_rq, tg->cfs_rq[cpu]); 1311391e43daSPeter Zijlstra p->se.cfs_rq = tg->cfs_rq[cpu]; 1312391e43daSPeter Zijlstra p->se.parent = tg->se[cpu]; 1313391e43daSPeter Zijlstra #endif 1314391e43daSPeter Zijlstra 1315391e43daSPeter Zijlstra #ifdef CONFIG_RT_GROUP_SCHED 1316391e43daSPeter Zijlstra p->rt.rt_rq = tg->rt_rq[cpu]; 1317391e43daSPeter Zijlstra p->rt.parent = tg->rt_se[cpu]; 1318391e43daSPeter Zijlstra #endif 1319391e43daSPeter Zijlstra } 1320391e43daSPeter Zijlstra 1321391e43daSPeter Zijlstra #else /* CONFIG_CGROUP_SCHED */ 1322391e43daSPeter Zijlstra 1323391e43daSPeter Zijlstra static inline void set_task_rq(struct task_struct *p, unsigned int cpu) { } 1324391e43daSPeter Zijlstra static inline struct task_group *task_group(struct task_struct *p) 1325391e43daSPeter Zijlstra { 1326391e43daSPeter Zijlstra return NULL; 1327391e43daSPeter Zijlstra } 1328391e43daSPeter Zijlstra 1329391e43daSPeter Zijlstra #endif /* CONFIG_CGROUP_SCHED */ 1330391e43daSPeter Zijlstra 1331391e43daSPeter Zijlstra static inline void __set_task_cpu(struct task_struct *p, unsigned int cpu) 1332391e43daSPeter Zijlstra { 1333391e43daSPeter Zijlstra set_task_rq(p, cpu); 1334391e43daSPeter Zijlstra #ifdef CONFIG_SMP 1335391e43daSPeter Zijlstra /* 1336391e43daSPeter Zijlstra * After ->cpu is set up to a new value, task_rq_lock(p, ...) can be 1337391e43daSPeter Zijlstra * successfuly executed on another CPU. We must ensure that updates of 1338391e43daSPeter Zijlstra * per-task data have been completed by this moment. 1339391e43daSPeter Zijlstra */ 1340391e43daSPeter Zijlstra smp_wmb(); 1341c65eacbeSAndy Lutomirski #ifdef CONFIG_THREAD_INFO_IN_TASK 1342c65eacbeSAndy Lutomirski p->cpu = cpu; 1343c65eacbeSAndy Lutomirski #else 1344391e43daSPeter Zijlstra task_thread_info(p)->cpu = cpu; 1345c65eacbeSAndy Lutomirski #endif 1346ac66f547SPeter Zijlstra p->wake_cpu = cpu; 1347391e43daSPeter Zijlstra #endif 1348391e43daSPeter Zijlstra } 1349391e43daSPeter Zijlstra 1350391e43daSPeter Zijlstra /* 1351391e43daSPeter Zijlstra * Tunables that become constants when CONFIG_SCHED_DEBUG is off: 1352391e43daSPeter Zijlstra */ 1353391e43daSPeter Zijlstra #ifdef CONFIG_SCHED_DEBUG 1354c5905afbSIngo Molnar # include <linux/static_key.h> 1355391e43daSPeter Zijlstra # define const_debug __read_mostly 1356391e43daSPeter Zijlstra #else 1357391e43daSPeter Zijlstra # define const_debug const 1358391e43daSPeter Zijlstra #endif 1359391e43daSPeter Zijlstra 1360391e43daSPeter Zijlstra #define SCHED_FEAT(name, enabled) \ 1361391e43daSPeter Zijlstra __SCHED_FEAT_##name , 1362391e43daSPeter Zijlstra 1363391e43daSPeter Zijlstra enum { 1364391e43daSPeter Zijlstra #include "features.h" 1365f8b6d1ccSPeter Zijlstra __SCHED_FEAT_NR, 1366391e43daSPeter Zijlstra }; 1367391e43daSPeter Zijlstra 1368391e43daSPeter Zijlstra #undef SCHED_FEAT 1369391e43daSPeter Zijlstra 1370f8b6d1ccSPeter Zijlstra #if defined(CONFIG_SCHED_DEBUG) && defined(HAVE_JUMP_LABEL) 1371765cc3a4SPatrick Bellasi 1372765cc3a4SPatrick Bellasi /* 1373765cc3a4SPatrick Bellasi * To support run-time toggling of sched features, all the translation units 1374765cc3a4SPatrick Bellasi * (but core.c) reference the sysctl_sched_features defined in core.c. 1375765cc3a4SPatrick Bellasi */ 1376765cc3a4SPatrick Bellasi extern const_debug unsigned int sysctl_sched_features; 1377765cc3a4SPatrick Bellasi 1378f8b6d1ccSPeter Zijlstra #define SCHED_FEAT(name, enabled) \ 1379c5905afbSIngo Molnar static __always_inline bool static_branch_##name(struct static_key *key) \ 1380f8b6d1ccSPeter Zijlstra { \ 13816e76ea8aSJason Baron return static_key_##enabled(key); \ 1382f8b6d1ccSPeter Zijlstra } 1383f8b6d1ccSPeter Zijlstra 1384f8b6d1ccSPeter Zijlstra #include "features.h" 1385f8b6d1ccSPeter Zijlstra #undef SCHED_FEAT 1386f8b6d1ccSPeter Zijlstra 1387c5905afbSIngo Molnar extern struct static_key sched_feat_keys[__SCHED_FEAT_NR]; 1388f8b6d1ccSPeter Zijlstra #define sched_feat(x) (static_branch_##x(&sched_feat_keys[__SCHED_FEAT_##x])) 1389765cc3a4SPatrick Bellasi 1390f8b6d1ccSPeter Zijlstra #else /* !(SCHED_DEBUG && HAVE_JUMP_LABEL) */ 1391765cc3a4SPatrick Bellasi 1392765cc3a4SPatrick Bellasi /* 1393765cc3a4SPatrick Bellasi * Each translation unit has its own copy of sysctl_sched_features to allow 1394765cc3a4SPatrick Bellasi * constants propagation at compile time and compiler optimization based on 1395765cc3a4SPatrick Bellasi * features default. 1396765cc3a4SPatrick Bellasi */ 1397765cc3a4SPatrick Bellasi #define SCHED_FEAT(name, enabled) \ 1398765cc3a4SPatrick Bellasi (1UL << __SCHED_FEAT_##name) * enabled | 1399765cc3a4SPatrick Bellasi static const_debug __maybe_unused unsigned int sysctl_sched_features = 1400765cc3a4SPatrick Bellasi #include "features.h" 1401765cc3a4SPatrick Bellasi 0; 1402765cc3a4SPatrick Bellasi #undef SCHED_FEAT 1403765cc3a4SPatrick Bellasi 1404391e43daSPeter Zijlstra #define sched_feat(x) (sysctl_sched_features & (1UL << __SCHED_FEAT_##x)) 1405765cc3a4SPatrick Bellasi 1406f8b6d1ccSPeter Zijlstra #endif /* SCHED_DEBUG && HAVE_JUMP_LABEL */ 1407391e43daSPeter Zijlstra 14082a595721SSrikar Dronamraju extern struct static_key_false sched_numa_balancing; 1409cb251765SMel Gorman extern struct static_key_false sched_schedstats; 1410cbee9f88SPeter Zijlstra 1411391e43daSPeter Zijlstra static inline u64 global_rt_period(void) 1412391e43daSPeter Zijlstra { 1413391e43daSPeter Zijlstra return (u64)sysctl_sched_rt_period * NSEC_PER_USEC; 1414391e43daSPeter Zijlstra } 1415391e43daSPeter Zijlstra 1416391e43daSPeter Zijlstra static inline u64 global_rt_runtime(void) 1417391e43daSPeter Zijlstra { 1418391e43daSPeter Zijlstra if (sysctl_sched_rt_runtime < 0) 1419391e43daSPeter Zijlstra return RUNTIME_INF; 1420391e43daSPeter Zijlstra 1421391e43daSPeter Zijlstra return (u64)sysctl_sched_rt_runtime * NSEC_PER_USEC; 1422391e43daSPeter Zijlstra } 1423391e43daSPeter Zijlstra 1424391e43daSPeter Zijlstra static inline int task_current(struct rq *rq, struct task_struct *p) 1425391e43daSPeter Zijlstra { 1426391e43daSPeter Zijlstra return rq->curr == p; 1427391e43daSPeter Zijlstra } 1428391e43daSPeter Zijlstra 1429391e43daSPeter Zijlstra static inline int task_running(struct rq *rq, struct task_struct *p) 1430391e43daSPeter Zijlstra { 1431391e43daSPeter Zijlstra #ifdef CONFIG_SMP 1432391e43daSPeter Zijlstra return p->on_cpu; 1433391e43daSPeter Zijlstra #else 1434391e43daSPeter Zijlstra return task_current(rq, p); 1435391e43daSPeter Zijlstra #endif 1436391e43daSPeter Zijlstra } 1437391e43daSPeter Zijlstra 1438da0c1e65SKirill Tkhai static inline int task_on_rq_queued(struct task_struct *p) 1439da0c1e65SKirill Tkhai { 1440da0c1e65SKirill Tkhai return p->on_rq == TASK_ON_RQ_QUEUED; 1441da0c1e65SKirill Tkhai } 1442391e43daSPeter Zijlstra 1443cca26e80SKirill Tkhai static inline int task_on_rq_migrating(struct task_struct *p) 1444cca26e80SKirill Tkhai { 1445cca26e80SKirill Tkhai return p->on_rq == TASK_ON_RQ_MIGRATING; 1446cca26e80SKirill Tkhai } 1447cca26e80SKirill Tkhai 1448b13095f0SLi Zefan /* 1449b13095f0SLi Zefan * wake flags 1450b13095f0SLi Zefan */ 145197fb7a0aSIngo Molnar #define WF_SYNC 0x01 /* Waker goes to sleep after wakeup */ 145297fb7a0aSIngo Molnar #define WF_FORK 0x02 /* Child wakeup after fork */ 145397fb7a0aSIngo Molnar #define WF_MIGRATED 0x4 /* Internal use, task got migrated */ 1454b13095f0SLi Zefan 1455391e43daSPeter Zijlstra /* 1456391e43daSPeter Zijlstra * To aid in avoiding the subversion of "niceness" due to uneven distribution 1457391e43daSPeter Zijlstra * of tasks with abnormal "nice" values across CPUs the contribution that 1458391e43daSPeter Zijlstra * each task makes to its run queue's load is weighted according to its 1459391e43daSPeter Zijlstra * scheduling class and "nice" value. For SCHED_NORMAL tasks this is just a 1460391e43daSPeter Zijlstra * scaled version of the new time slice allocation that they receive on time 1461391e43daSPeter Zijlstra * slice expiry etc. 1462391e43daSPeter Zijlstra */ 1463391e43daSPeter Zijlstra 1464391e43daSPeter Zijlstra #define WEIGHT_IDLEPRIO 3 1465391e43daSPeter Zijlstra #define WMULT_IDLEPRIO 1431655765 1466391e43daSPeter Zijlstra 1467ed82b8a1SAndi Kleen extern const int sched_prio_to_weight[40]; 1468ed82b8a1SAndi Kleen extern const u32 sched_prio_to_wmult[40]; 1469391e43daSPeter Zijlstra 1470ff77e468SPeter Zijlstra /* 1471ff77e468SPeter Zijlstra * {de,en}queue flags: 1472ff77e468SPeter Zijlstra * 1473ff77e468SPeter Zijlstra * DEQUEUE_SLEEP - task is no longer runnable 1474ff77e468SPeter Zijlstra * ENQUEUE_WAKEUP - task just became runnable 1475ff77e468SPeter Zijlstra * 1476ff77e468SPeter Zijlstra * SAVE/RESTORE - an otherwise spurious dequeue/enqueue, done to ensure tasks 1477ff77e468SPeter Zijlstra * are in a known state which allows modification. Such pairs 1478ff77e468SPeter Zijlstra * should preserve as much state as possible. 1479ff77e468SPeter Zijlstra * 1480ff77e468SPeter Zijlstra * MOVE - paired with SAVE/RESTORE, explicitly does not preserve the location 1481ff77e468SPeter Zijlstra * in the runqueue. 1482ff77e468SPeter Zijlstra * 1483ff77e468SPeter Zijlstra * ENQUEUE_HEAD - place at front of runqueue (tail if not specified) 1484ff77e468SPeter Zijlstra * ENQUEUE_REPLENISH - CBS (replenish runtime and postpone deadline) 148559efa0baSPeter Zijlstra * ENQUEUE_MIGRATED - the task was migrated during wakeup 1486ff77e468SPeter Zijlstra * 1487ff77e468SPeter Zijlstra */ 1488ff77e468SPeter Zijlstra 1489ff77e468SPeter Zijlstra #define DEQUEUE_SLEEP 0x01 149097fb7a0aSIngo Molnar #define DEQUEUE_SAVE 0x02 /* Matches ENQUEUE_RESTORE */ 149197fb7a0aSIngo Molnar #define DEQUEUE_MOVE 0x04 /* Matches ENQUEUE_MOVE */ 149297fb7a0aSIngo Molnar #define DEQUEUE_NOCLOCK 0x08 /* Matches ENQUEUE_NOCLOCK */ 1493ff77e468SPeter Zijlstra 14941de64443SPeter Zijlstra #define ENQUEUE_WAKEUP 0x01 1495ff77e468SPeter Zijlstra #define ENQUEUE_RESTORE 0x02 1496ff77e468SPeter Zijlstra #define ENQUEUE_MOVE 0x04 14970a67d1eeSPeter Zijlstra #define ENQUEUE_NOCLOCK 0x08 1498ff77e468SPeter Zijlstra 14990a67d1eeSPeter Zijlstra #define ENQUEUE_HEAD 0x10 15000a67d1eeSPeter Zijlstra #define ENQUEUE_REPLENISH 0x20 1501c82ba9faSLi Zefan #ifdef CONFIG_SMP 15020a67d1eeSPeter Zijlstra #define ENQUEUE_MIGRATED 0x40 1503c82ba9faSLi Zefan #else 150459efa0baSPeter Zijlstra #define ENQUEUE_MIGRATED 0x00 1505c82ba9faSLi Zefan #endif 1506c82ba9faSLi Zefan 150737e117c0SPeter Zijlstra #define RETRY_TASK ((void *)-1UL) 150837e117c0SPeter Zijlstra 1509c82ba9faSLi Zefan struct sched_class { 1510c82ba9faSLi Zefan const struct sched_class *next; 1511c82ba9faSLi Zefan 1512c82ba9faSLi Zefan void (*enqueue_task) (struct rq *rq, struct task_struct *p, int flags); 1513c82ba9faSLi Zefan void (*dequeue_task) (struct rq *rq, struct task_struct *p, int flags); 1514c82ba9faSLi Zefan void (*yield_task) (struct rq *rq); 1515c82ba9faSLi Zefan bool (*yield_to_task)(struct rq *rq, struct task_struct *p, bool preempt); 1516c82ba9faSLi Zefan 1517c82ba9faSLi Zefan void (*check_preempt_curr)(struct rq *rq, struct task_struct *p, int flags); 1518c82ba9faSLi Zefan 1519606dba2eSPeter Zijlstra /* 1520606dba2eSPeter Zijlstra * It is the responsibility of the pick_next_task() method that will 1521606dba2eSPeter Zijlstra * return the next task to call put_prev_task() on the @prev task or 1522606dba2eSPeter Zijlstra * something equivalent. 152337e117c0SPeter Zijlstra * 152437e117c0SPeter Zijlstra * May return RETRY_TASK when it finds a higher prio class has runnable 152537e117c0SPeter Zijlstra * tasks. 1526606dba2eSPeter Zijlstra */ 1527606dba2eSPeter Zijlstra struct task_struct * (*pick_next_task)(struct rq *rq, 1528e7904a28SPeter Zijlstra struct task_struct *prev, 1529d8ac8971SMatt Fleming struct rq_flags *rf); 1530c82ba9faSLi Zefan void (*put_prev_task)(struct rq *rq, struct task_struct *p); 1531c82ba9faSLi Zefan 1532c82ba9faSLi Zefan #ifdef CONFIG_SMP 1533ac66f547SPeter Zijlstra int (*select_task_rq)(struct task_struct *p, int task_cpu, int sd_flag, int flags); 15345a4fd036Sxiaofeng.yan void (*migrate_task_rq)(struct task_struct *p); 1535c82ba9faSLi Zefan 1536c82ba9faSLi Zefan void (*task_woken)(struct rq *this_rq, struct task_struct *task); 1537c82ba9faSLi Zefan 1538c82ba9faSLi Zefan void (*set_cpus_allowed)(struct task_struct *p, 1539c82ba9faSLi Zefan const struct cpumask *newmask); 1540c82ba9faSLi Zefan 1541c82ba9faSLi Zefan void (*rq_online)(struct rq *rq); 1542c82ba9faSLi Zefan void (*rq_offline)(struct rq *rq); 1543c82ba9faSLi Zefan #endif 1544c82ba9faSLi Zefan 1545c82ba9faSLi Zefan void (*set_curr_task)(struct rq *rq); 1546c82ba9faSLi Zefan void (*task_tick)(struct rq *rq, struct task_struct *p, int queued); 1547c82ba9faSLi Zefan void (*task_fork)(struct task_struct *p); 1548e6c390f2SDario Faggioli void (*task_dead)(struct task_struct *p); 1549c82ba9faSLi Zefan 155067dfa1b7SKirill Tkhai /* 155167dfa1b7SKirill Tkhai * The switched_from() call is allowed to drop rq->lock, therefore we 155267dfa1b7SKirill Tkhai * cannot assume the switched_from/switched_to pair is serliazed by 155367dfa1b7SKirill Tkhai * rq->lock. They are however serialized by p->pi_lock. 155467dfa1b7SKirill Tkhai */ 1555c82ba9faSLi Zefan void (*switched_from)(struct rq *this_rq, struct task_struct *task); 1556c82ba9faSLi Zefan void (*switched_to) (struct rq *this_rq, struct task_struct *task); 1557c82ba9faSLi Zefan void (*prio_changed) (struct rq *this_rq, struct task_struct *task, 1558c82ba9faSLi Zefan int oldprio); 1559c82ba9faSLi Zefan 1560c82ba9faSLi Zefan unsigned int (*get_rr_interval)(struct rq *rq, 1561c82ba9faSLi Zefan struct task_struct *task); 1562c82ba9faSLi Zefan 15636e998916SStanislaw Gruszka void (*update_curr)(struct rq *rq); 15646e998916SStanislaw Gruszka 1565ea86cb4bSVincent Guittot #define TASK_SET_GROUP 0 1566ea86cb4bSVincent Guittot #define TASK_MOVE_GROUP 1 1567ea86cb4bSVincent Guittot 1568c82ba9faSLi Zefan #ifdef CONFIG_FAIR_GROUP_SCHED 1569ea86cb4bSVincent Guittot void (*task_change_group)(struct task_struct *p, int type); 1570c82ba9faSLi Zefan #endif 1571c82ba9faSLi Zefan }; 1572391e43daSPeter Zijlstra 15733f1d2a31SPeter Zijlstra static inline void put_prev_task(struct rq *rq, struct task_struct *prev) 15743f1d2a31SPeter Zijlstra { 15753f1d2a31SPeter Zijlstra prev->sched_class->put_prev_task(rq, prev); 15763f1d2a31SPeter Zijlstra } 15773f1d2a31SPeter Zijlstra 1578b2bf6c31SPeter Zijlstra static inline void set_curr_task(struct rq *rq, struct task_struct *curr) 1579b2bf6c31SPeter Zijlstra { 1580b2bf6c31SPeter Zijlstra curr->sched_class->set_curr_task(rq); 1581b2bf6c31SPeter Zijlstra } 1582b2bf6c31SPeter Zijlstra 1583f5832c19SNicolas Pitre #ifdef CONFIG_SMP 1584391e43daSPeter Zijlstra #define sched_class_highest (&stop_sched_class) 1585f5832c19SNicolas Pitre #else 1586f5832c19SNicolas Pitre #define sched_class_highest (&dl_sched_class) 1587f5832c19SNicolas Pitre #endif 1588391e43daSPeter Zijlstra #define for_each_class(class) \ 1589391e43daSPeter Zijlstra for (class = sched_class_highest; class; class = class->next) 1590391e43daSPeter Zijlstra 1591391e43daSPeter Zijlstra extern const struct sched_class stop_sched_class; 1592aab03e05SDario Faggioli extern const struct sched_class dl_sched_class; 1593391e43daSPeter Zijlstra extern const struct sched_class rt_sched_class; 1594391e43daSPeter Zijlstra extern const struct sched_class fair_sched_class; 1595391e43daSPeter Zijlstra extern const struct sched_class idle_sched_class; 1596391e43daSPeter Zijlstra 1597391e43daSPeter Zijlstra 1598391e43daSPeter Zijlstra #ifdef CONFIG_SMP 1599391e43daSPeter Zijlstra 160063b2ca30SNicolas Pitre extern void update_group_capacity(struct sched_domain *sd, int cpu); 1601b719203bSLi Zefan 16027caff66fSDaniel Lezcano extern void trigger_load_balance(struct rq *rq); 1603391e43daSPeter Zijlstra 1604c5b28038SPeter Zijlstra extern void set_cpus_allowed_common(struct task_struct *p, const struct cpumask *new_mask); 1605c5b28038SPeter Zijlstra 1606391e43daSPeter Zijlstra #endif 1607391e43daSPeter Zijlstra 1608442bf3aaSDaniel Lezcano #ifdef CONFIG_CPU_IDLE 1609442bf3aaSDaniel Lezcano static inline void idle_set_state(struct rq *rq, 1610442bf3aaSDaniel Lezcano struct cpuidle_state *idle_state) 1611442bf3aaSDaniel Lezcano { 1612442bf3aaSDaniel Lezcano rq->idle_state = idle_state; 1613442bf3aaSDaniel Lezcano } 1614442bf3aaSDaniel Lezcano 1615442bf3aaSDaniel Lezcano static inline struct cpuidle_state *idle_get_state(struct rq *rq) 1616442bf3aaSDaniel Lezcano { 16179148a3a1SPeter Zijlstra SCHED_WARN_ON(!rcu_read_lock_held()); 161897fb7a0aSIngo Molnar 1619442bf3aaSDaniel Lezcano return rq->idle_state; 1620442bf3aaSDaniel Lezcano } 1621442bf3aaSDaniel Lezcano #else 1622442bf3aaSDaniel Lezcano static inline void idle_set_state(struct rq *rq, 1623442bf3aaSDaniel Lezcano struct cpuidle_state *idle_state) 1624442bf3aaSDaniel Lezcano { 1625442bf3aaSDaniel Lezcano } 1626442bf3aaSDaniel Lezcano 1627442bf3aaSDaniel Lezcano static inline struct cpuidle_state *idle_get_state(struct rq *rq) 1628442bf3aaSDaniel Lezcano { 1629442bf3aaSDaniel Lezcano return NULL; 1630442bf3aaSDaniel Lezcano } 1631442bf3aaSDaniel Lezcano #endif 1632442bf3aaSDaniel Lezcano 16338663effbSSteven Rostedt (VMware) extern void schedule_idle(void); 16348663effbSSteven Rostedt (VMware) 1635391e43daSPeter Zijlstra extern void sysrq_sched_debug_show(void); 1636391e43daSPeter Zijlstra extern void sched_init_granularity(void); 1637391e43daSPeter Zijlstra extern void update_max_interval(void); 16381baca4ceSJuri Lelli 16391baca4ceSJuri Lelli extern void init_sched_dl_class(void); 1640391e43daSPeter Zijlstra extern void init_sched_rt_class(void); 1641391e43daSPeter Zijlstra extern void init_sched_fair_class(void); 1642391e43daSPeter Zijlstra 16439059393eSVincent Guittot extern void reweight_task(struct task_struct *p, int prio); 16449059393eSVincent Guittot 16458875125eSKirill Tkhai extern void resched_curr(struct rq *rq); 1646391e43daSPeter Zijlstra extern void resched_cpu(int cpu); 1647391e43daSPeter Zijlstra 1648391e43daSPeter Zijlstra extern struct rt_bandwidth def_rt_bandwidth; 1649391e43daSPeter Zijlstra extern void init_rt_bandwidth(struct rt_bandwidth *rt_b, u64 period, u64 runtime); 1650391e43daSPeter Zijlstra 1651332ac17eSDario Faggioli extern struct dl_bandwidth def_dl_bandwidth; 1652332ac17eSDario Faggioli extern void init_dl_bandwidth(struct dl_bandwidth *dl_b, u64 period, u64 runtime); 1653aab03e05SDario Faggioli extern void init_dl_task_timer(struct sched_dl_entity *dl_se); 1654209a0cbdSLuca Abeni extern void init_dl_inactive_task_timer(struct sched_dl_entity *dl_se); 16554da3abceSLuca Abeni extern void init_dl_rq_bw_ratio(struct dl_rq *dl_rq); 1656aab03e05SDario Faggioli 1657c52f14d3SLuca Abeni #define BW_SHIFT 20 1658c52f14d3SLuca Abeni #define BW_UNIT (1 << BW_SHIFT) 16594da3abceSLuca Abeni #define RATIO_SHIFT 8 1660332ac17eSDario Faggioli unsigned long to_ratio(u64 period, u64 runtime); 1661332ac17eSDario Faggioli 1662540247fbSYuyang Du extern void init_entity_runnable_average(struct sched_entity *se); 16632b8c41daSYuyang Du extern void post_init_entity_util_avg(struct sched_entity *se); 1664a75cdaa9SAlex Shi 166576d92ac3SFrederic Weisbecker #ifdef CONFIG_NO_HZ_FULL 166676d92ac3SFrederic Weisbecker extern bool sched_can_stop_tick(struct rq *rq); 1667d84b3131SFrederic Weisbecker extern int __init sched_tick_offload_init(void); 166876d92ac3SFrederic Weisbecker 166976d92ac3SFrederic Weisbecker /* 167076d92ac3SFrederic Weisbecker * Tick may be needed by tasks in the runqueue depending on their policy and 167176d92ac3SFrederic Weisbecker * requirements. If tick is needed, lets send the target an IPI to kick it out of 167276d92ac3SFrederic Weisbecker * nohz mode if necessary. 167376d92ac3SFrederic Weisbecker */ 167476d92ac3SFrederic Weisbecker static inline void sched_update_tick_dependency(struct rq *rq) 167576d92ac3SFrederic Weisbecker { 167676d92ac3SFrederic Weisbecker int cpu; 167776d92ac3SFrederic Weisbecker 167876d92ac3SFrederic Weisbecker if (!tick_nohz_full_enabled()) 167976d92ac3SFrederic Weisbecker return; 168076d92ac3SFrederic Weisbecker 168176d92ac3SFrederic Weisbecker cpu = cpu_of(rq); 168276d92ac3SFrederic Weisbecker 168376d92ac3SFrederic Weisbecker if (!tick_nohz_full_cpu(cpu)) 168476d92ac3SFrederic Weisbecker return; 168576d92ac3SFrederic Weisbecker 168676d92ac3SFrederic Weisbecker if (sched_can_stop_tick(rq)) 168776d92ac3SFrederic Weisbecker tick_nohz_dep_clear_cpu(cpu, TICK_DEP_BIT_SCHED); 168876d92ac3SFrederic Weisbecker else 168976d92ac3SFrederic Weisbecker tick_nohz_dep_set_cpu(cpu, TICK_DEP_BIT_SCHED); 169076d92ac3SFrederic Weisbecker } 169176d92ac3SFrederic Weisbecker #else 1692d84b3131SFrederic Weisbecker static inline int sched_tick_offload_init(void) { return 0; } 169376d92ac3SFrederic Weisbecker static inline void sched_update_tick_dependency(struct rq *rq) { } 169476d92ac3SFrederic Weisbecker #endif 169576d92ac3SFrederic Weisbecker 169672465447SKirill Tkhai static inline void add_nr_running(struct rq *rq, unsigned count) 1697391e43daSPeter Zijlstra { 169872465447SKirill Tkhai unsigned prev_nr = rq->nr_running; 169972465447SKirill Tkhai 170072465447SKirill Tkhai rq->nr_running = prev_nr + count; 17019f3660c2SFrederic Weisbecker 170272465447SKirill Tkhai if (prev_nr < 2 && rq->nr_running >= 2) { 17034486edd1STim Chen #ifdef CONFIG_SMP 1704e90c8fe1SValentin Schneider if (!READ_ONCE(rq->rd->overload)) 1705e90c8fe1SValentin Schneider WRITE_ONCE(rq->rd->overload, 1); 17064486edd1STim Chen #endif 170776d92ac3SFrederic Weisbecker } 17084486edd1STim Chen 170976d92ac3SFrederic Weisbecker sched_update_tick_dependency(rq); 17104486edd1STim Chen } 1711391e43daSPeter Zijlstra 171272465447SKirill Tkhai static inline void sub_nr_running(struct rq *rq, unsigned count) 1713391e43daSPeter Zijlstra { 171472465447SKirill Tkhai rq->nr_running -= count; 171576d92ac3SFrederic Weisbecker /* Check if we still need preemption */ 171676d92ac3SFrederic Weisbecker sched_update_tick_dependency(rq); 1717391e43daSPeter Zijlstra } 1718391e43daSPeter Zijlstra 1719391e43daSPeter Zijlstra extern void update_rq_clock(struct rq *rq); 1720391e43daSPeter Zijlstra 1721391e43daSPeter Zijlstra extern void activate_task(struct rq *rq, struct task_struct *p, int flags); 1722391e43daSPeter Zijlstra extern void deactivate_task(struct rq *rq, struct task_struct *p, int flags); 1723391e43daSPeter Zijlstra 1724391e43daSPeter Zijlstra extern void check_preempt_curr(struct rq *rq, struct task_struct *p, int flags); 1725391e43daSPeter Zijlstra 1726391e43daSPeter Zijlstra extern const_debug unsigned int sysctl_sched_nr_migrate; 1727391e43daSPeter Zijlstra extern const_debug unsigned int sysctl_sched_migration_cost; 1728391e43daSPeter Zijlstra 1729391e43daSPeter Zijlstra #ifdef CONFIG_SCHED_HRTICK 1730391e43daSPeter Zijlstra 1731391e43daSPeter Zijlstra /* 1732391e43daSPeter Zijlstra * Use hrtick when: 1733391e43daSPeter Zijlstra * - enabled by features 1734391e43daSPeter Zijlstra * - hrtimer is actually high res 1735391e43daSPeter Zijlstra */ 1736391e43daSPeter Zijlstra static inline int hrtick_enabled(struct rq *rq) 1737391e43daSPeter Zijlstra { 1738391e43daSPeter Zijlstra if (!sched_feat(HRTICK)) 1739391e43daSPeter Zijlstra return 0; 1740391e43daSPeter Zijlstra if (!cpu_active(cpu_of(rq))) 1741391e43daSPeter Zijlstra return 0; 1742391e43daSPeter Zijlstra return hrtimer_is_hres_active(&rq->hrtick_timer); 1743391e43daSPeter Zijlstra } 1744391e43daSPeter Zijlstra 1745391e43daSPeter Zijlstra void hrtick_start(struct rq *rq, u64 delay); 1746391e43daSPeter Zijlstra 1747b39e66eaSMike Galbraith #else 1748b39e66eaSMike Galbraith 1749b39e66eaSMike Galbraith static inline int hrtick_enabled(struct rq *rq) 1750b39e66eaSMike Galbraith { 1751b39e66eaSMike Galbraith return 0; 1752b39e66eaSMike Galbraith } 1753b39e66eaSMike Galbraith 1754391e43daSPeter Zijlstra #endif /* CONFIG_SCHED_HRTICK */ 1755391e43daSPeter Zijlstra 1756dfbca41fSPeter Zijlstra #ifndef arch_scale_freq_capacity 1757dfbca41fSPeter Zijlstra static __always_inline 17587673c8a4SJuri Lelli unsigned long arch_scale_freq_capacity(int cpu) 1759dfbca41fSPeter Zijlstra { 1760dfbca41fSPeter Zijlstra return SCHED_CAPACITY_SCALE; 1761dfbca41fSPeter Zijlstra } 1762dfbca41fSPeter Zijlstra #endif 1763b5b4860dSVincent Guittot 17647e1a9208SJuri Lelli #ifdef CONFIG_SMP 17658cd5601cSMorten Rasmussen #ifndef arch_scale_cpu_capacity 17668cd5601cSMorten Rasmussen static __always_inline 17678cd5601cSMorten Rasmussen unsigned long arch_scale_cpu_capacity(struct sched_domain *sd, int cpu) 17688cd5601cSMorten Rasmussen { 1769e3279a2eSDietmar Eggemann if (sd && (sd->flags & SD_SHARE_CPUCAPACITY) && (sd->span_weight > 1)) 17708cd5601cSMorten Rasmussen return sd->smt_gain / sd->span_weight; 17718cd5601cSMorten Rasmussen 17728cd5601cSMorten Rasmussen return SCHED_CAPACITY_SCALE; 17738cd5601cSMorten Rasmussen } 17748cd5601cSMorten Rasmussen #endif 1775391e43daSPeter Zijlstra #else 17767e1a9208SJuri Lelli #ifndef arch_scale_cpu_capacity 17777e1a9208SJuri Lelli static __always_inline 17787e1a9208SJuri Lelli unsigned long arch_scale_cpu_capacity(void __always_unused *sd, int cpu) 17797e1a9208SJuri Lelli { 17807e1a9208SJuri Lelli return SCHED_CAPACITY_SCALE; 17817e1a9208SJuri Lelli } 17827e1a9208SJuri Lelli #endif 1783391e43daSPeter Zijlstra #endif 1784391e43daSPeter Zijlstra 1785eb580751SPeter Zijlstra struct rq *__task_rq_lock(struct task_struct *p, struct rq_flags *rf) 17863e71a462SPeter Zijlstra __acquires(rq->lock); 17878a8c69c3SPeter Zijlstra 1788eb580751SPeter Zijlstra struct rq *task_rq_lock(struct task_struct *p, struct rq_flags *rf) 17893960c8c0SPeter Zijlstra __acquires(p->pi_lock) 17903e71a462SPeter Zijlstra __acquires(rq->lock); 17913960c8c0SPeter Zijlstra 1792eb580751SPeter Zijlstra static inline void __task_rq_unlock(struct rq *rq, struct rq_flags *rf) 17933960c8c0SPeter Zijlstra __releases(rq->lock) 17943960c8c0SPeter Zijlstra { 1795d8ac8971SMatt Fleming rq_unpin_lock(rq, rf); 17963960c8c0SPeter Zijlstra raw_spin_unlock(&rq->lock); 17973960c8c0SPeter Zijlstra } 17983960c8c0SPeter Zijlstra 17993960c8c0SPeter Zijlstra static inline void 1800eb580751SPeter Zijlstra task_rq_unlock(struct rq *rq, struct task_struct *p, struct rq_flags *rf) 18013960c8c0SPeter Zijlstra __releases(rq->lock) 18023960c8c0SPeter Zijlstra __releases(p->pi_lock) 18033960c8c0SPeter Zijlstra { 1804d8ac8971SMatt Fleming rq_unpin_lock(rq, rf); 18053960c8c0SPeter Zijlstra raw_spin_unlock(&rq->lock); 1806eb580751SPeter Zijlstra raw_spin_unlock_irqrestore(&p->pi_lock, rf->flags); 18073960c8c0SPeter Zijlstra } 18083960c8c0SPeter Zijlstra 18098a8c69c3SPeter Zijlstra static inline void 18108a8c69c3SPeter Zijlstra rq_lock_irqsave(struct rq *rq, struct rq_flags *rf) 18118a8c69c3SPeter Zijlstra __acquires(rq->lock) 18128a8c69c3SPeter Zijlstra { 18138a8c69c3SPeter Zijlstra raw_spin_lock_irqsave(&rq->lock, rf->flags); 18148a8c69c3SPeter Zijlstra rq_pin_lock(rq, rf); 18158a8c69c3SPeter Zijlstra } 18168a8c69c3SPeter Zijlstra 18178a8c69c3SPeter Zijlstra static inline void 18188a8c69c3SPeter Zijlstra rq_lock_irq(struct rq *rq, struct rq_flags *rf) 18198a8c69c3SPeter Zijlstra __acquires(rq->lock) 18208a8c69c3SPeter Zijlstra { 18218a8c69c3SPeter Zijlstra raw_spin_lock_irq(&rq->lock); 18228a8c69c3SPeter Zijlstra rq_pin_lock(rq, rf); 18238a8c69c3SPeter Zijlstra } 18248a8c69c3SPeter Zijlstra 18258a8c69c3SPeter Zijlstra static inline void 18268a8c69c3SPeter Zijlstra rq_lock(struct rq *rq, struct rq_flags *rf) 18278a8c69c3SPeter Zijlstra __acquires(rq->lock) 18288a8c69c3SPeter Zijlstra { 18298a8c69c3SPeter Zijlstra raw_spin_lock(&rq->lock); 18308a8c69c3SPeter Zijlstra rq_pin_lock(rq, rf); 18318a8c69c3SPeter Zijlstra } 18328a8c69c3SPeter Zijlstra 18338a8c69c3SPeter Zijlstra static inline void 18348a8c69c3SPeter Zijlstra rq_relock(struct rq *rq, struct rq_flags *rf) 18358a8c69c3SPeter Zijlstra __acquires(rq->lock) 18368a8c69c3SPeter Zijlstra { 18378a8c69c3SPeter Zijlstra raw_spin_lock(&rq->lock); 18388a8c69c3SPeter Zijlstra rq_repin_lock(rq, rf); 18398a8c69c3SPeter Zijlstra } 18408a8c69c3SPeter Zijlstra 18418a8c69c3SPeter Zijlstra static inline void 18428a8c69c3SPeter Zijlstra rq_unlock_irqrestore(struct rq *rq, struct rq_flags *rf) 18438a8c69c3SPeter Zijlstra __releases(rq->lock) 18448a8c69c3SPeter Zijlstra { 18458a8c69c3SPeter Zijlstra rq_unpin_lock(rq, rf); 18468a8c69c3SPeter Zijlstra raw_spin_unlock_irqrestore(&rq->lock, rf->flags); 18478a8c69c3SPeter Zijlstra } 18488a8c69c3SPeter Zijlstra 18498a8c69c3SPeter Zijlstra static inline void 18508a8c69c3SPeter Zijlstra rq_unlock_irq(struct rq *rq, struct rq_flags *rf) 18518a8c69c3SPeter Zijlstra __releases(rq->lock) 18528a8c69c3SPeter Zijlstra { 18538a8c69c3SPeter Zijlstra rq_unpin_lock(rq, rf); 18548a8c69c3SPeter Zijlstra raw_spin_unlock_irq(&rq->lock); 18558a8c69c3SPeter Zijlstra } 18568a8c69c3SPeter Zijlstra 18578a8c69c3SPeter Zijlstra static inline void 18588a8c69c3SPeter Zijlstra rq_unlock(struct rq *rq, struct rq_flags *rf) 18598a8c69c3SPeter Zijlstra __releases(rq->lock) 18608a8c69c3SPeter Zijlstra { 18618a8c69c3SPeter Zijlstra rq_unpin_lock(rq, rf); 18628a8c69c3SPeter Zijlstra raw_spin_unlock(&rq->lock); 18638a8c69c3SPeter Zijlstra } 18648a8c69c3SPeter Zijlstra 1865391e43daSPeter Zijlstra #ifdef CONFIG_SMP 1866391e43daSPeter Zijlstra #ifdef CONFIG_PREEMPT 1867391e43daSPeter Zijlstra 1868391e43daSPeter Zijlstra static inline void double_rq_lock(struct rq *rq1, struct rq *rq2); 1869391e43daSPeter Zijlstra 1870391e43daSPeter Zijlstra /* 1871391e43daSPeter Zijlstra * fair double_lock_balance: Safely acquires both rq->locks in a fair 1872391e43daSPeter Zijlstra * way at the expense of forcing extra atomic operations in all 1873391e43daSPeter Zijlstra * invocations. This assures that the double_lock is acquired using the 1874391e43daSPeter Zijlstra * same underlying policy as the spinlock_t on this architecture, which 1875391e43daSPeter Zijlstra * reduces latency compared to the unfair variant below. However, it 1876391e43daSPeter Zijlstra * also adds more overhead and therefore may reduce throughput. 1877391e43daSPeter Zijlstra */ 1878391e43daSPeter Zijlstra static inline int _double_lock_balance(struct rq *this_rq, struct rq *busiest) 1879391e43daSPeter Zijlstra __releases(this_rq->lock) 1880391e43daSPeter Zijlstra __acquires(busiest->lock) 1881391e43daSPeter Zijlstra __acquires(this_rq->lock) 1882391e43daSPeter Zijlstra { 1883391e43daSPeter Zijlstra raw_spin_unlock(&this_rq->lock); 1884391e43daSPeter Zijlstra double_rq_lock(this_rq, busiest); 1885391e43daSPeter Zijlstra 1886391e43daSPeter Zijlstra return 1; 1887391e43daSPeter Zijlstra } 1888391e43daSPeter Zijlstra 1889391e43daSPeter Zijlstra #else 1890391e43daSPeter Zijlstra /* 1891391e43daSPeter Zijlstra * Unfair double_lock_balance: Optimizes throughput at the expense of 1892391e43daSPeter Zijlstra * latency by eliminating extra atomic operations when the locks are 189397fb7a0aSIngo Molnar * already in proper order on entry. This favors lower CPU-ids and will 189497fb7a0aSIngo Molnar * grant the double lock to lower CPUs over higher ids under contention, 1895391e43daSPeter Zijlstra * regardless of entry order into the function. 1896391e43daSPeter Zijlstra */ 1897391e43daSPeter Zijlstra static inline int _double_lock_balance(struct rq *this_rq, struct rq *busiest) 1898391e43daSPeter Zijlstra __releases(this_rq->lock) 1899391e43daSPeter Zijlstra __acquires(busiest->lock) 1900391e43daSPeter Zijlstra __acquires(this_rq->lock) 1901391e43daSPeter Zijlstra { 1902391e43daSPeter Zijlstra int ret = 0; 1903391e43daSPeter Zijlstra 1904391e43daSPeter Zijlstra if (unlikely(!raw_spin_trylock(&busiest->lock))) { 1905391e43daSPeter Zijlstra if (busiest < this_rq) { 1906391e43daSPeter Zijlstra raw_spin_unlock(&this_rq->lock); 1907391e43daSPeter Zijlstra raw_spin_lock(&busiest->lock); 1908391e43daSPeter Zijlstra raw_spin_lock_nested(&this_rq->lock, 1909391e43daSPeter Zijlstra SINGLE_DEPTH_NESTING); 1910391e43daSPeter Zijlstra ret = 1; 1911391e43daSPeter Zijlstra } else 1912391e43daSPeter Zijlstra raw_spin_lock_nested(&busiest->lock, 1913391e43daSPeter Zijlstra SINGLE_DEPTH_NESTING); 1914391e43daSPeter Zijlstra } 1915391e43daSPeter Zijlstra return ret; 1916391e43daSPeter Zijlstra } 1917391e43daSPeter Zijlstra 1918391e43daSPeter Zijlstra #endif /* CONFIG_PREEMPT */ 1919391e43daSPeter Zijlstra 1920391e43daSPeter Zijlstra /* 1921391e43daSPeter Zijlstra * double_lock_balance - lock the busiest runqueue, this_rq is locked already. 1922391e43daSPeter Zijlstra */ 1923391e43daSPeter Zijlstra static inline int double_lock_balance(struct rq *this_rq, struct rq *busiest) 1924391e43daSPeter Zijlstra { 1925391e43daSPeter Zijlstra if (unlikely(!irqs_disabled())) { 192697fb7a0aSIngo Molnar /* printk() doesn't work well under rq->lock */ 1927391e43daSPeter Zijlstra raw_spin_unlock(&this_rq->lock); 1928391e43daSPeter Zijlstra BUG_ON(1); 1929391e43daSPeter Zijlstra } 1930391e43daSPeter Zijlstra 1931391e43daSPeter Zijlstra return _double_lock_balance(this_rq, busiest); 1932391e43daSPeter Zijlstra } 1933391e43daSPeter Zijlstra 1934391e43daSPeter Zijlstra static inline void double_unlock_balance(struct rq *this_rq, struct rq *busiest) 1935391e43daSPeter Zijlstra __releases(busiest->lock) 1936391e43daSPeter Zijlstra { 1937391e43daSPeter Zijlstra raw_spin_unlock(&busiest->lock); 1938391e43daSPeter Zijlstra lock_set_subclass(&this_rq->lock.dep_map, 0, _RET_IP_); 1939391e43daSPeter Zijlstra } 1940391e43daSPeter Zijlstra 194174602315SPeter Zijlstra static inline void double_lock(spinlock_t *l1, spinlock_t *l2) 194274602315SPeter Zijlstra { 194374602315SPeter Zijlstra if (l1 > l2) 194474602315SPeter Zijlstra swap(l1, l2); 194574602315SPeter Zijlstra 194674602315SPeter Zijlstra spin_lock(l1); 194774602315SPeter Zijlstra spin_lock_nested(l2, SINGLE_DEPTH_NESTING); 194874602315SPeter Zijlstra } 194974602315SPeter Zijlstra 195060e69eedSMike Galbraith static inline void double_lock_irq(spinlock_t *l1, spinlock_t *l2) 195160e69eedSMike Galbraith { 195260e69eedSMike Galbraith if (l1 > l2) 195360e69eedSMike Galbraith swap(l1, l2); 195460e69eedSMike Galbraith 195560e69eedSMike Galbraith spin_lock_irq(l1); 195660e69eedSMike Galbraith spin_lock_nested(l2, SINGLE_DEPTH_NESTING); 195760e69eedSMike Galbraith } 195860e69eedSMike Galbraith 195974602315SPeter Zijlstra static inline void double_raw_lock(raw_spinlock_t *l1, raw_spinlock_t *l2) 196074602315SPeter Zijlstra { 196174602315SPeter Zijlstra if (l1 > l2) 196274602315SPeter Zijlstra swap(l1, l2); 196374602315SPeter Zijlstra 196474602315SPeter Zijlstra raw_spin_lock(l1); 196574602315SPeter Zijlstra raw_spin_lock_nested(l2, SINGLE_DEPTH_NESTING); 196674602315SPeter Zijlstra } 196774602315SPeter Zijlstra 1968391e43daSPeter Zijlstra /* 1969391e43daSPeter Zijlstra * double_rq_lock - safely lock two runqueues 1970391e43daSPeter Zijlstra * 1971391e43daSPeter Zijlstra * Note this does not disable interrupts like task_rq_lock, 1972391e43daSPeter Zijlstra * you need to do so manually before calling. 1973391e43daSPeter Zijlstra */ 1974391e43daSPeter Zijlstra static inline void double_rq_lock(struct rq *rq1, struct rq *rq2) 1975391e43daSPeter Zijlstra __acquires(rq1->lock) 1976391e43daSPeter Zijlstra __acquires(rq2->lock) 1977391e43daSPeter Zijlstra { 1978391e43daSPeter Zijlstra BUG_ON(!irqs_disabled()); 1979391e43daSPeter Zijlstra if (rq1 == rq2) { 1980391e43daSPeter Zijlstra raw_spin_lock(&rq1->lock); 1981391e43daSPeter Zijlstra __acquire(rq2->lock); /* Fake it out ;) */ 1982391e43daSPeter Zijlstra } else { 1983391e43daSPeter Zijlstra if (rq1 < rq2) { 1984391e43daSPeter Zijlstra raw_spin_lock(&rq1->lock); 1985391e43daSPeter Zijlstra raw_spin_lock_nested(&rq2->lock, SINGLE_DEPTH_NESTING); 1986391e43daSPeter Zijlstra } else { 1987391e43daSPeter Zijlstra raw_spin_lock(&rq2->lock); 1988391e43daSPeter Zijlstra raw_spin_lock_nested(&rq1->lock, SINGLE_DEPTH_NESTING); 1989391e43daSPeter Zijlstra } 1990391e43daSPeter Zijlstra } 1991391e43daSPeter Zijlstra } 1992391e43daSPeter Zijlstra 1993391e43daSPeter Zijlstra /* 1994391e43daSPeter Zijlstra * double_rq_unlock - safely unlock two runqueues 1995391e43daSPeter Zijlstra * 1996391e43daSPeter Zijlstra * Note this does not restore interrupts like task_rq_unlock, 1997391e43daSPeter Zijlstra * you need to do so manually after calling. 1998391e43daSPeter Zijlstra */ 1999391e43daSPeter Zijlstra static inline void double_rq_unlock(struct rq *rq1, struct rq *rq2) 2000391e43daSPeter Zijlstra __releases(rq1->lock) 2001391e43daSPeter Zijlstra __releases(rq2->lock) 2002391e43daSPeter Zijlstra { 2003391e43daSPeter Zijlstra raw_spin_unlock(&rq1->lock); 2004391e43daSPeter Zijlstra if (rq1 != rq2) 2005391e43daSPeter Zijlstra raw_spin_unlock(&rq2->lock); 2006391e43daSPeter Zijlstra else 2007391e43daSPeter Zijlstra __release(rq2->lock); 2008391e43daSPeter Zijlstra } 2009391e43daSPeter Zijlstra 2010f2cb1360SIngo Molnar extern void set_rq_online (struct rq *rq); 2011f2cb1360SIngo Molnar extern void set_rq_offline(struct rq *rq); 2012f2cb1360SIngo Molnar extern bool sched_smp_initialized; 2013f2cb1360SIngo Molnar 2014391e43daSPeter Zijlstra #else /* CONFIG_SMP */ 2015391e43daSPeter Zijlstra 2016391e43daSPeter Zijlstra /* 2017391e43daSPeter Zijlstra * double_rq_lock - safely lock two runqueues 2018391e43daSPeter Zijlstra * 2019391e43daSPeter Zijlstra * Note this does not disable interrupts like task_rq_lock, 2020391e43daSPeter Zijlstra * you need to do so manually before calling. 2021391e43daSPeter Zijlstra */ 2022391e43daSPeter Zijlstra static inline void double_rq_lock(struct rq *rq1, struct rq *rq2) 2023391e43daSPeter Zijlstra __acquires(rq1->lock) 2024391e43daSPeter Zijlstra __acquires(rq2->lock) 2025391e43daSPeter Zijlstra { 2026391e43daSPeter Zijlstra BUG_ON(!irqs_disabled()); 2027391e43daSPeter Zijlstra BUG_ON(rq1 != rq2); 2028391e43daSPeter Zijlstra raw_spin_lock(&rq1->lock); 2029391e43daSPeter Zijlstra __acquire(rq2->lock); /* Fake it out ;) */ 2030391e43daSPeter Zijlstra } 2031391e43daSPeter Zijlstra 2032391e43daSPeter Zijlstra /* 2033391e43daSPeter Zijlstra * double_rq_unlock - safely unlock two runqueues 2034391e43daSPeter Zijlstra * 2035391e43daSPeter Zijlstra * Note this does not restore interrupts like task_rq_unlock, 2036391e43daSPeter Zijlstra * you need to do so manually after calling. 2037391e43daSPeter Zijlstra */ 2038391e43daSPeter Zijlstra static inline void double_rq_unlock(struct rq *rq1, struct rq *rq2) 2039391e43daSPeter Zijlstra __releases(rq1->lock) 2040391e43daSPeter Zijlstra __releases(rq2->lock) 2041391e43daSPeter Zijlstra { 2042391e43daSPeter Zijlstra BUG_ON(rq1 != rq2); 2043391e43daSPeter Zijlstra raw_spin_unlock(&rq1->lock); 2044391e43daSPeter Zijlstra __release(rq2->lock); 2045391e43daSPeter Zijlstra } 2046391e43daSPeter Zijlstra 2047391e43daSPeter Zijlstra #endif 2048391e43daSPeter Zijlstra 2049391e43daSPeter Zijlstra extern struct sched_entity *__pick_first_entity(struct cfs_rq *cfs_rq); 2050391e43daSPeter Zijlstra extern struct sched_entity *__pick_last_entity(struct cfs_rq *cfs_rq); 20516b55c965SSrikar Dronamraju 20526b55c965SSrikar Dronamraju #ifdef CONFIG_SCHED_DEBUG 20539469eb01SPeter Zijlstra extern bool sched_debug_enabled; 20549469eb01SPeter Zijlstra 2055391e43daSPeter Zijlstra extern void print_cfs_stats(struct seq_file *m, int cpu); 2056391e43daSPeter Zijlstra extern void print_rt_stats(struct seq_file *m, int cpu); 2057acb32132SWanpeng Li extern void print_dl_stats(struct seq_file *m, int cpu); 2058f6a34630SMathieu Malaterre extern void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq); 2059f6a34630SMathieu Malaterre extern void print_rt_rq(struct seq_file *m, int cpu, struct rt_rq *rt_rq); 2060f6a34630SMathieu Malaterre extern void print_dl_rq(struct seq_file *m, int cpu, struct dl_rq *dl_rq); 2061397f2378SSrikar Dronamraju #ifdef CONFIG_NUMA_BALANCING 2062397f2378SSrikar Dronamraju extern void 2063397f2378SSrikar Dronamraju show_numa_stats(struct task_struct *p, struct seq_file *m); 2064397f2378SSrikar Dronamraju extern void 2065397f2378SSrikar Dronamraju print_numa_stats(struct seq_file *m, int node, unsigned long tsf, 2066397f2378SSrikar Dronamraju unsigned long tpf, unsigned long gsf, unsigned long gpf); 2067397f2378SSrikar Dronamraju #endif /* CONFIG_NUMA_BALANCING */ 2068397f2378SSrikar Dronamraju #endif /* CONFIG_SCHED_DEBUG */ 2069391e43daSPeter Zijlstra 2070391e43daSPeter Zijlstra extern void init_cfs_rq(struct cfs_rq *cfs_rq); 207107c54f7aSAbel Vesa extern void init_rt_rq(struct rt_rq *rt_rq); 207207c54f7aSAbel Vesa extern void init_dl_rq(struct dl_rq *dl_rq); 2073391e43daSPeter Zijlstra 20741ee14e6cSBen Segall extern void cfs_bandwidth_usage_inc(void); 20751ee14e6cSBen Segall extern void cfs_bandwidth_usage_dec(void); 20761c792db7SSuresh Siddha 20773451d024SFrederic Weisbecker #ifdef CONFIG_NO_HZ_COMMON 207800357f5eSPeter Zijlstra #define NOHZ_BALANCE_KICK_BIT 0 207900357f5eSPeter Zijlstra #define NOHZ_STATS_KICK_BIT 1 2080a22e47a4SPeter Zijlstra 2081a22e47a4SPeter Zijlstra #define NOHZ_BALANCE_KICK BIT(NOHZ_BALANCE_KICK_BIT) 2082b7031a02SPeter Zijlstra #define NOHZ_STATS_KICK BIT(NOHZ_STATS_KICK_BIT) 2083b7031a02SPeter Zijlstra 2084b7031a02SPeter Zijlstra #define NOHZ_KICK_MASK (NOHZ_BALANCE_KICK | NOHZ_STATS_KICK) 20851c792db7SSuresh Siddha 20861c792db7SSuresh Siddha #define nohz_flags(cpu) (&cpu_rq(cpu)->nohz_flags) 208720a5c8ccSThomas Gleixner 208800357f5eSPeter Zijlstra extern void nohz_balance_exit_idle(struct rq *rq); 208920a5c8ccSThomas Gleixner #else 209000357f5eSPeter Zijlstra static inline void nohz_balance_exit_idle(struct rq *rq) { } 20911c792db7SSuresh Siddha #endif 209273fbec60SFrederic Weisbecker 2093daec5798SLuca Abeni 2094daec5798SLuca Abeni #ifdef CONFIG_SMP 2095daec5798SLuca Abeni static inline 2096daec5798SLuca Abeni void __dl_update(struct dl_bw *dl_b, s64 bw) 2097daec5798SLuca Abeni { 2098daec5798SLuca Abeni struct root_domain *rd = container_of(dl_b, struct root_domain, dl_bw); 2099daec5798SLuca Abeni int i; 2100daec5798SLuca Abeni 2101daec5798SLuca Abeni RCU_LOCKDEP_WARN(!rcu_read_lock_sched_held(), 2102daec5798SLuca Abeni "sched RCU must be held"); 2103daec5798SLuca Abeni for_each_cpu_and(i, rd->span, cpu_active_mask) { 2104daec5798SLuca Abeni struct rq *rq = cpu_rq(i); 2105daec5798SLuca Abeni 2106daec5798SLuca Abeni rq->dl.extra_bw += bw; 2107daec5798SLuca Abeni } 2108daec5798SLuca Abeni } 2109daec5798SLuca Abeni #else 2110daec5798SLuca Abeni static inline 2111daec5798SLuca Abeni void __dl_update(struct dl_bw *dl_b, s64 bw) 2112daec5798SLuca Abeni { 2113daec5798SLuca Abeni struct dl_rq *dl = container_of(dl_b, struct dl_rq, dl_bw); 2114daec5798SLuca Abeni 2115daec5798SLuca Abeni dl->extra_bw += bw; 2116daec5798SLuca Abeni } 2117daec5798SLuca Abeni #endif 2118daec5798SLuca Abeni 2119daec5798SLuca Abeni 212073fbec60SFrederic Weisbecker #ifdef CONFIG_IRQ_TIME_ACCOUNTING 212119d23dbfSFrederic Weisbecker struct irqtime { 212225e2d8c1SFrederic Weisbecker u64 total; 2123a499a5a1SFrederic Weisbecker u64 tick_delta; 212419d23dbfSFrederic Weisbecker u64 irq_start_time; 212519d23dbfSFrederic Weisbecker struct u64_stats_sync sync; 212619d23dbfSFrederic Weisbecker }; 212773fbec60SFrederic Weisbecker 212819d23dbfSFrederic Weisbecker DECLARE_PER_CPU(struct irqtime, cpu_irqtime); 212973fbec60SFrederic Weisbecker 213025e2d8c1SFrederic Weisbecker /* 213125e2d8c1SFrederic Weisbecker * Returns the irqtime minus the softirq time computed by ksoftirqd. 213225e2d8c1SFrederic Weisbecker * Otherwise ksoftirqd's sum_exec_runtime is substracted its own runtime 213325e2d8c1SFrederic Weisbecker * and never move forward. 213425e2d8c1SFrederic Weisbecker */ 213573fbec60SFrederic Weisbecker static inline u64 irq_time_read(int cpu) 213673fbec60SFrederic Weisbecker { 213719d23dbfSFrederic Weisbecker struct irqtime *irqtime = &per_cpu(cpu_irqtime, cpu); 213819d23dbfSFrederic Weisbecker unsigned int seq; 213919d23dbfSFrederic Weisbecker u64 total; 214073fbec60SFrederic Weisbecker 214173fbec60SFrederic Weisbecker do { 214219d23dbfSFrederic Weisbecker seq = __u64_stats_fetch_begin(&irqtime->sync); 214325e2d8c1SFrederic Weisbecker total = irqtime->total; 214419d23dbfSFrederic Weisbecker } while (__u64_stats_fetch_retry(&irqtime->sync, seq)); 214573fbec60SFrederic Weisbecker 214619d23dbfSFrederic Weisbecker return total; 214773fbec60SFrederic Weisbecker } 214873fbec60SFrederic Weisbecker #endif /* CONFIG_IRQ_TIME_ACCOUNTING */ 2149adaf9fcdSRafael J. Wysocki 2150adaf9fcdSRafael J. Wysocki #ifdef CONFIG_CPU_FREQ 2151adaf9fcdSRafael J. Wysocki DECLARE_PER_CPU(struct update_util_data *, cpufreq_update_util_data); 2152adaf9fcdSRafael J. Wysocki 2153adaf9fcdSRafael J. Wysocki /** 2154adaf9fcdSRafael J. Wysocki * cpufreq_update_util - Take a note about CPU utilization changes. 215512bde33dSRafael J. Wysocki * @rq: Runqueue to carry out the update for. 215658919e83SRafael J. Wysocki * @flags: Update reason flags. 2157adaf9fcdSRafael J. Wysocki * 215858919e83SRafael J. Wysocki * This function is called by the scheduler on the CPU whose utilization is 215958919e83SRafael J. Wysocki * being updated. 2160adaf9fcdSRafael J. Wysocki * 2161adaf9fcdSRafael J. Wysocki * It can only be called from RCU-sched read-side critical sections. 2162adaf9fcdSRafael J. Wysocki * 2163adaf9fcdSRafael J. Wysocki * The way cpufreq is currently arranged requires it to evaluate the CPU 2164adaf9fcdSRafael J. Wysocki * performance state (frequency/voltage) on a regular basis to prevent it from 2165adaf9fcdSRafael J. Wysocki * being stuck in a completely inadequate performance level for too long. 2166e0367b12SJuri Lelli * That is not guaranteed to happen if the updates are only triggered from CFS 2167e0367b12SJuri Lelli * and DL, though, because they may not be coming in if only RT tasks are 2168e0367b12SJuri Lelli * active all the time (or there are RT tasks only). 2169adaf9fcdSRafael J. Wysocki * 2170e0367b12SJuri Lelli * As a workaround for that issue, this function is called periodically by the 2171e0367b12SJuri Lelli * RT sched class to trigger extra cpufreq updates to prevent it from stalling, 2172adaf9fcdSRafael J. Wysocki * but that really is a band-aid. Going forward it should be replaced with 2173e0367b12SJuri Lelli * solutions targeted more specifically at RT tasks. 2174adaf9fcdSRafael J. Wysocki */ 217512bde33dSRafael J. Wysocki static inline void cpufreq_update_util(struct rq *rq, unsigned int flags) 2176adaf9fcdSRafael J. Wysocki { 217758919e83SRafael J. Wysocki struct update_util_data *data; 217858919e83SRafael J. Wysocki 2179674e7541SViresh Kumar data = rcu_dereference_sched(*per_cpu_ptr(&cpufreq_update_util_data, 2180674e7541SViresh Kumar cpu_of(rq))); 218158919e83SRafael J. Wysocki if (data) 218212bde33dSRafael J. Wysocki data->func(data, rq_clock(rq), flags); 218312bde33dSRafael J. Wysocki } 2184adaf9fcdSRafael J. Wysocki #else 218512bde33dSRafael J. Wysocki static inline void cpufreq_update_util(struct rq *rq, unsigned int flags) {} 2186adaf9fcdSRafael J. Wysocki #endif /* CONFIG_CPU_FREQ */ 2187be53f58fSLinus Torvalds 21889bdcb44eSRafael J. Wysocki #ifdef arch_scale_freq_capacity 21899bdcb44eSRafael J. Wysocki # ifndef arch_scale_freq_invariant 219097fb7a0aSIngo Molnar # define arch_scale_freq_invariant() true 21919bdcb44eSRafael J. Wysocki # endif 219297fb7a0aSIngo Molnar #else 219397fb7a0aSIngo Molnar # define arch_scale_freq_invariant() false 21949bdcb44eSRafael J. Wysocki #endif 2195d4edd662SJuri Lelli 2196794a56ebSJuri Lelli #ifdef CONFIG_CPU_FREQ_GOV_SCHEDUTIL 21978cc90515SVincent Guittot static inline unsigned long cpu_bw_dl(struct rq *rq) 2198d4edd662SJuri Lelli { 2199d4edd662SJuri Lelli return (rq->dl.running_bw * SCHED_CAPACITY_SCALE) >> BW_SHIFT; 2200d4edd662SJuri Lelli } 2201d4edd662SJuri Lelli 22028cc90515SVincent Guittot static inline unsigned long cpu_util_dl(struct rq *rq) 22038cc90515SVincent Guittot { 22048cc90515SVincent Guittot return READ_ONCE(rq->avg_dl.util_avg); 22058cc90515SVincent Guittot } 22068cc90515SVincent Guittot 2207d4edd662SJuri Lelli static inline unsigned long cpu_util_cfs(struct rq *rq) 2208d4edd662SJuri Lelli { 2209a07630b8SPatrick Bellasi unsigned long util = READ_ONCE(rq->cfs.avg.util_avg); 2210a07630b8SPatrick Bellasi 2211a07630b8SPatrick Bellasi if (sched_feat(UTIL_EST)) { 2212a07630b8SPatrick Bellasi util = max_t(unsigned long, util, 2213a07630b8SPatrick Bellasi READ_ONCE(rq->cfs.avg.util_est.enqueued)); 2214a07630b8SPatrick Bellasi } 2215a07630b8SPatrick Bellasi 2216a07630b8SPatrick Bellasi return util; 2217d4edd662SJuri Lelli } 2218371bf427SVincent Guittot 2219371bf427SVincent Guittot static inline unsigned long cpu_util_rt(struct rq *rq) 2220371bf427SVincent Guittot { 2221dfa444dcSVincent Guittot return READ_ONCE(rq->avg_rt.util_avg); 2222371bf427SVincent Guittot } 22232e62c474SVincent Guittot #endif 22249033ea11SVincent Guittot 22252e62c474SVincent Guittot #ifdef HAVE_SCHED_AVG_IRQ 22269033ea11SVincent Guittot static inline unsigned long cpu_util_irq(struct rq *rq) 22279033ea11SVincent Guittot { 22289033ea11SVincent Guittot return rq->avg_irq.util_avg; 22299033ea11SVincent Guittot } 22302e62c474SVincent Guittot 22312e62c474SVincent Guittot static inline 22322e62c474SVincent Guittot unsigned long scale_irq_capacity(unsigned long util, unsigned long irq, unsigned long max) 22332e62c474SVincent Guittot { 22342e62c474SVincent Guittot util *= (max - irq); 22352e62c474SVincent Guittot util /= max; 22362e62c474SVincent Guittot 22372e62c474SVincent Guittot return util; 22382e62c474SVincent Guittot 22392e62c474SVincent Guittot } 22409033ea11SVincent Guittot #else 22419033ea11SVincent Guittot static inline unsigned long cpu_util_irq(struct rq *rq) 22429033ea11SVincent Guittot { 22439033ea11SVincent Guittot return 0; 22449033ea11SVincent Guittot } 22459033ea11SVincent Guittot 22462e62c474SVincent Guittot static inline 22472e62c474SVincent Guittot unsigned long scale_irq_capacity(unsigned long util, unsigned long irq, unsigned long max) 22482e62c474SVincent Guittot { 22492e62c474SVincent Guittot return util; 22502e62c474SVincent Guittot } 2251794a56ebSJuri Lelli #endif 2252