topology.h (6846B)
1/* SPDX-License-Identifier: GPL-2.0 */ 2#ifndef _LINUX_SCHED_TOPOLOGY_H 3#define _LINUX_SCHED_TOPOLOGY_H 4 5#include <linux/topology.h> 6 7#include <linux/sched/idle.h> 8 9/* 10 * sched-domains (multiprocessor balancing) declarations: 11 */ 12#ifdef CONFIG_SMP 13 14/* Generate SD flag indexes */ 15#define SD_FLAG(name, mflags) __##name, 16enum { 17 #include <linux/sched/sd_flags.h> 18 __SD_FLAG_CNT, 19}; 20#undef SD_FLAG 21/* Generate SD flag bits */ 22#define SD_FLAG(name, mflags) name = 1 << __##name, 23enum { 24 #include <linux/sched/sd_flags.h> 25}; 26#undef SD_FLAG 27 28#ifdef CONFIG_SCHED_DEBUG 29 30struct sd_flag_debug { 31 unsigned int meta_flags; 32 char *name; 33}; 34extern const struct sd_flag_debug sd_flag_debug[]; 35 36#endif 37 38#ifdef CONFIG_SCHED_SMT 39static inline int cpu_smt_flags(void) 40{ 41 return SD_SHARE_CPUCAPACITY | SD_SHARE_PKG_RESOURCES; 42} 43#endif 44 45#ifdef CONFIG_SCHED_CLUSTER 46static inline int cpu_cluster_flags(void) 47{ 48 return SD_SHARE_PKG_RESOURCES; 49} 50#endif 51 52#ifdef CONFIG_SCHED_MC 53static inline int cpu_core_flags(void) 54{ 55 return SD_SHARE_PKG_RESOURCES; 56} 57#endif 58 59#ifdef CONFIG_NUMA 60static inline int cpu_numa_flags(void) 61{ 62 return SD_NUMA; 63} 64#endif 65 66extern int arch_asym_cpu_priority(int cpu); 67 68struct sched_domain_attr { 69 int relax_domain_level; 70}; 71 72#define SD_ATTR_INIT (struct sched_domain_attr) { \ 73 .relax_domain_level = -1, \ 74} 75 76extern int sched_domain_level_max; 77 78struct sched_group; 79 80struct sched_domain_shared { 81 atomic_t ref; 82 atomic_t nr_busy_cpus; 83 int has_idle_cores; 84}; 85 86struct sched_domain { 87 /* These fields must be setup */ 88 struct sched_domain __rcu *parent; /* top domain must be null terminated */ 89 struct sched_domain __rcu *child; /* bottom domain must be null terminated */ 90 struct sched_group *groups; /* the balancing groups of the domain */ 91 unsigned long min_interval; /* Minimum balance interval ms */ 92 unsigned long max_interval; /* Maximum balance interval ms */ 93 unsigned int busy_factor; /* less balancing by factor if busy */ 94 unsigned int imbalance_pct; /* No balance until over watermark */ 95 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */ 96 unsigned int imb_numa_nr; /* Nr running tasks that allows a NUMA imbalance */ 97 98 int nohz_idle; /* NOHZ IDLE status */ 99 int flags; /* See SD_* */ 100 int level; 101 102 /* Runtime fields. */ 103 unsigned long last_balance; /* init to jiffies. units in jiffies */ 104 unsigned int balance_interval; /* initialise to 1. units in ms. */ 105 unsigned int nr_balance_failed; /* initialise to 0 */ 106 107 /* idle_balance() stats */ 108 u64 max_newidle_lb_cost; 109 unsigned long last_decay_max_lb_cost; 110 111 u64 avg_scan_cost; /* select_idle_sibling */ 112 113#ifdef CONFIG_SCHEDSTATS 114 /* load_balance() stats */ 115 unsigned int lb_count[CPU_MAX_IDLE_TYPES]; 116 unsigned int lb_failed[CPU_MAX_IDLE_TYPES]; 117 unsigned int lb_balanced[CPU_MAX_IDLE_TYPES]; 118 unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES]; 119 unsigned int lb_gained[CPU_MAX_IDLE_TYPES]; 120 unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES]; 121 unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES]; 122 unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES]; 123 124 /* Active load balancing */ 125 unsigned int alb_count; 126 unsigned int alb_failed; 127 unsigned int alb_pushed; 128 129 /* SD_BALANCE_EXEC stats */ 130 unsigned int sbe_count; 131 unsigned int sbe_balanced; 132 unsigned int sbe_pushed; 133 134 /* SD_BALANCE_FORK stats */ 135 unsigned int sbf_count; 136 unsigned int sbf_balanced; 137 unsigned int sbf_pushed; 138 139 /* try_to_wake_up() stats */ 140 unsigned int ttwu_wake_remote; 141 unsigned int ttwu_move_affine; 142 unsigned int ttwu_move_balance; 143#endif 144#ifdef CONFIG_SCHED_DEBUG 145 char *name; 146#endif 147 union { 148 void *private; /* used during construction */ 149 struct rcu_head rcu; /* used during destruction */ 150 }; 151 struct sched_domain_shared *shared; 152 153 unsigned int span_weight; 154 /* 155 * Span of all CPUs in this domain. 156 * 157 * NOTE: this field is variable length. (Allocated dynamically 158 * by attaching extra space to the end of the structure, 159 * depending on how many CPUs the kernel has booted up with) 160 */ 161 unsigned long span[]; 162}; 163 164static inline struct cpumask *sched_domain_span(struct sched_domain *sd) 165{ 166 return to_cpumask(sd->span); 167} 168 169extern void partition_sched_domains_locked(int ndoms_new, 170 cpumask_var_t doms_new[], 171 struct sched_domain_attr *dattr_new); 172 173extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[], 174 struct sched_domain_attr *dattr_new); 175 176/* Allocate an array of sched domains, for partition_sched_domains(). */ 177cpumask_var_t *alloc_sched_domains(unsigned int ndoms); 178void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms); 179 180bool cpus_share_cache(int this_cpu, int that_cpu); 181 182typedef const struct cpumask *(*sched_domain_mask_f)(int cpu); 183typedef int (*sched_domain_flags_f)(void); 184 185#define SDTL_OVERLAP 0x01 186 187struct sd_data { 188 struct sched_domain *__percpu *sd; 189 struct sched_domain_shared *__percpu *sds; 190 struct sched_group *__percpu *sg; 191 struct sched_group_capacity *__percpu *sgc; 192}; 193 194struct sched_domain_topology_level { 195 sched_domain_mask_f mask; 196 sched_domain_flags_f sd_flags; 197 int flags; 198 int numa_level; 199 struct sd_data data; 200#ifdef CONFIG_SCHED_DEBUG 201 char *name; 202#endif 203}; 204 205extern void set_sched_topology(struct sched_domain_topology_level *tl); 206 207#ifdef CONFIG_SCHED_DEBUG 208# define SD_INIT_NAME(type) .name = #type 209#else 210# define SD_INIT_NAME(type) 211#endif 212 213#else /* CONFIG_SMP */ 214 215struct sched_domain_attr; 216 217static inline void 218partition_sched_domains_locked(int ndoms_new, cpumask_var_t doms_new[], 219 struct sched_domain_attr *dattr_new) 220{ 221} 222 223static inline void 224partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[], 225 struct sched_domain_attr *dattr_new) 226{ 227} 228 229static inline bool cpus_share_cache(int this_cpu, int that_cpu) 230{ 231 return true; 232} 233 234#endif /* !CONFIG_SMP */ 235 236#if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL) 237extern void rebuild_sched_domains_energy(void); 238#else 239static inline void rebuild_sched_domains_energy(void) 240{ 241} 242#endif 243 244#ifndef arch_scale_cpu_capacity 245/** 246 * arch_scale_cpu_capacity - get the capacity scale factor of a given CPU. 247 * @cpu: the CPU in question. 248 * 249 * Return: the CPU scale factor normalized against SCHED_CAPACITY_SCALE, i.e. 250 * 251 * max_perf(cpu) 252 * ----------------------------- * SCHED_CAPACITY_SCALE 253 * max(max_perf(c) : c \in CPUs) 254 */ 255static __always_inline 256unsigned long arch_scale_cpu_capacity(int cpu) 257{ 258 return SCHED_CAPACITY_SCALE; 259} 260#endif 261 262#ifndef arch_scale_thermal_pressure 263static __always_inline 264unsigned long arch_scale_thermal_pressure(int cpu) 265{ 266 return 0; 267} 268#endif 269 270#ifndef arch_update_thermal_pressure 271static __always_inline 272void arch_update_thermal_pressure(const struct cpumask *cpus, 273 unsigned long capped_frequency) 274{ } 275#endif 276 277static inline int task_node(const struct task_struct *p) 278{ 279 return cpu_to_node(task_cpu(p)); 280} 281 282#endif /* _LINUX_SCHED_TOPOLOGY_H */