1 #ifndef _LINUX_SCHED_TOPOLOGY_H 2 #define _LINUX_SCHED_TOPOLOGY_H 3 4 #include <linux/topology.h> 5 6 #include <linux/sched/idle.h> 7 8 /* 9 * sched-domains (multiprocessor balancing) declarations: 10 */ 11 #ifdef CONFIG_SMP 12 13 #define SD_LOAD_BALANCE 0x0001 /* Do load balancing on this domain. */ 14 #define SD_BALANCE_NEWIDLE 0x0002 /* Balance when about to become idle */ 15 #define SD_BALANCE_EXEC 0x0004 /* Balance on exec */ 16 #define SD_BALANCE_FORK 0x0008 /* Balance on fork, clone */ 17 #define SD_BALANCE_WAKE 0x0010 /* Balance on wakeup */ 18 #define SD_WAKE_AFFINE 0x0020 /* Wake task to waking CPU */ 19 #define SD_ASYM_CPUCAPACITY 0x0040 /* Groups have different max cpu capacities */ 20 #define SD_SHARE_CPUCAPACITY 0x0080 /* Domain members share cpu capacity */ 21 #define SD_SHARE_POWERDOMAIN 0x0100 /* Domain members share power domain */ 22 #define SD_SHARE_PKG_RESOURCES 0x0200 /* Domain members share cpu pkg resources */ 23 #define SD_SERIALIZE 0x0400 /* Only a single load balancing instance */ 24 #define SD_ASYM_PACKING 0x0800 /* Place busy groups earlier in the domain */ 25 #define SD_PREFER_SIBLING 0x1000 /* Prefer to place tasks in a sibling domain */ 26 #define SD_OVERLAP 0x2000 /* sched_domains of this level overlap */ 27 #define SD_NUMA 0x4000 /* cross-node balancing */ 28 29 /* 30 * Increase resolution of cpu_capacity calculations 31 */ 32 #define SCHED_CAPACITY_SHIFT SCHED_FIXEDPOINT_SHIFT 33 #define SCHED_CAPACITY_SCALE (1L << SCHED_CAPACITY_SHIFT) 34 35 #ifdef CONFIG_SCHED_SMT 36 static inline int cpu_smt_flags(void) 37 { 38 return SD_SHARE_CPUCAPACITY | SD_SHARE_PKG_RESOURCES; 39 } 40 #endif 41 42 #ifdef CONFIG_SCHED_MC 43 static inline int cpu_core_flags(void) 44 { 45 return SD_SHARE_PKG_RESOURCES; 46 } 47 #endif 48 49 #ifdef CONFIG_NUMA 50 static inline int cpu_numa_flags(void) 51 { 52 return SD_NUMA; 53 } 54 #endif 55 56 extern int arch_asym_cpu_priority(int cpu); 57 58 struct sched_domain_attr { 59 int relax_domain_level; 60 }; 61 62 #define SD_ATTR_INIT (struct sched_domain_attr) { \ 63 .relax_domain_level = -1, \ 64 } 65 66 extern int sched_domain_level_max; 67 68 struct sched_group; 69 70 struct sched_domain_shared { 71 atomic_t ref; 72 atomic_t nr_busy_cpus; 73 int has_idle_cores; 74 }; 75 76 struct sched_domain { 77 /* These fields must be setup */ 78 struct sched_domain *parent; /* top domain must be null terminated */ 79 struct sched_domain *child; /* bottom domain must be null terminated */ 80 struct sched_group *groups; /* the balancing groups of the domain */ 81 unsigned long min_interval; /* Minimum balance interval ms */ 82 unsigned long max_interval; /* Maximum balance interval ms */ 83 unsigned int busy_factor; /* less balancing by factor if busy */ 84 unsigned int imbalance_pct; /* No balance until over watermark */ 85 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */ 86 unsigned int busy_idx; 87 unsigned int idle_idx; 88 unsigned int newidle_idx; 89 unsigned int wake_idx; 90 unsigned int forkexec_idx; 91 unsigned int smt_gain; 92 93 int nohz_idle; /* NOHZ IDLE status */ 94 int flags; /* See SD_* */ 95 int level; 96 97 /* Runtime fields. */ 98 unsigned long last_balance; /* init to jiffies. units in jiffies */ 99 unsigned int balance_interval; /* initialise to 1. units in ms. */ 100 unsigned int nr_balance_failed; /* initialise to 0 */ 101 102 /* idle_balance() stats */ 103 u64 max_newidle_lb_cost; 104 unsigned long next_decay_max_lb_cost; 105 106 u64 avg_scan_cost; /* select_idle_sibling */ 107 108 #ifdef CONFIG_SCHEDSTATS 109 /* load_balance() stats */ 110 unsigned int lb_count[CPU_MAX_IDLE_TYPES]; 111 unsigned int lb_failed[CPU_MAX_IDLE_TYPES]; 112 unsigned int lb_balanced[CPU_MAX_IDLE_TYPES]; 113 unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES]; 114 unsigned int lb_gained[CPU_MAX_IDLE_TYPES]; 115 unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES]; 116 unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES]; 117 unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES]; 118 119 /* Active load balancing */ 120 unsigned int alb_count; 121 unsigned int alb_failed; 122 unsigned int alb_pushed; 123 124 /* SD_BALANCE_EXEC stats */ 125 unsigned int sbe_count; 126 unsigned int sbe_balanced; 127 unsigned int sbe_pushed; 128 129 /* SD_BALANCE_FORK stats */ 130 unsigned int sbf_count; 131 unsigned int sbf_balanced; 132 unsigned int sbf_pushed; 133 134 /* try_to_wake_up() stats */ 135 unsigned int ttwu_wake_remote; 136 unsigned int ttwu_move_affine; 137 unsigned int ttwu_move_balance; 138 #endif 139 #ifdef CONFIG_SCHED_DEBUG 140 char *name; 141 #endif 142 union { 143 void *private; /* used during construction */ 144 struct rcu_head rcu; /* used during destruction */ 145 }; 146 struct sched_domain_shared *shared; 147 148 unsigned int span_weight; 149 /* 150 * Span of all CPUs in this domain. 151 * 152 * NOTE: this field is variable length. (Allocated dynamically 153 * by attaching extra space to the end of the structure, 154 * depending on how many CPUs the kernel has booted up with) 155 */ 156 unsigned long span[0]; 157 }; 158 159 static inline struct cpumask *sched_domain_span(struct sched_domain *sd) 160 { 161 return to_cpumask(sd->span); 162 } 163 164 extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[], 165 struct sched_domain_attr *dattr_new); 166 167 /* Allocate an array of sched domains, for partition_sched_domains(). */ 168 cpumask_var_t *alloc_sched_domains(unsigned int ndoms); 169 void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms); 170 171 bool cpus_share_cache(int this_cpu, int that_cpu); 172 173 typedef const struct cpumask *(*sched_domain_mask_f)(int cpu); 174 typedef int (*sched_domain_flags_f)(void); 175 176 #define SDTL_OVERLAP 0x01 177 178 struct sd_data { 179 struct sched_domain **__percpu sd; 180 struct sched_domain_shared **__percpu sds; 181 struct sched_group **__percpu sg; 182 struct sched_group_capacity **__percpu sgc; 183 }; 184 185 struct sched_domain_topology_level { 186 sched_domain_mask_f mask; 187 sched_domain_flags_f sd_flags; 188 int flags; 189 int numa_level; 190 struct sd_data data; 191 #ifdef CONFIG_SCHED_DEBUG 192 char *name; 193 #endif 194 }; 195 196 extern void set_sched_topology(struct sched_domain_topology_level *tl); 197 198 #ifdef CONFIG_SCHED_DEBUG 199 # define SD_INIT_NAME(type) .name = #type 200 #else 201 # define SD_INIT_NAME(type) 202 #endif 203 204 #else /* CONFIG_SMP */ 205 206 struct sched_domain_attr; 207 208 static inline void 209 partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[], 210 struct sched_domain_attr *dattr_new) 211 { 212 } 213 214 static inline bool cpus_share_cache(int this_cpu, int that_cpu) 215 { 216 return true; 217 } 218 219 #endif /* !CONFIG_SMP */ 220 221 static inline int task_node(const struct task_struct *p) 222 { 223 return cpu_to_node(task_cpu(p)); 224 } 225 226 #endif /* _LINUX_SCHED_TOPOLOGY_H */ 227