1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_SCHED_TOPOLOGY_H
3 #define _LINUX_SCHED_TOPOLOGY_H
5 #include <linux/topology.h>
7 #include <linux/sched/idle.h>
10 * sched-domains (multiprocessor balancing) declarations:
14 /* Generate SD flag indexes */
15 #define SD_FLAG(name, mflags) __##name,
17 #include <linux/sched/sd_flags.h>
21 /* Generate SD flag bits */
22 #define SD_FLAG(name, mflags) name = 1 << __##name,
24 #include <linux/sched/sd_flags.h>
28 struct sd_flag_debug {
29 unsigned int meta_flags;
32 extern const struct sd_flag_debug sd_flag_debug[];
34 #ifdef CONFIG_SCHED_SMT
35 static inline int cpu_smt_flags(void)
37 return SD_SHARE_CPUCAPACITY | SD_SHARE_LLC;
41 #ifdef CONFIG_SCHED_CLUSTER
42 static inline int cpu_cluster_flags(void)
44 return SD_CLUSTER | SD_SHARE_LLC;
48 #ifdef CONFIG_SCHED_MC
49 static inline int cpu_core_flags(void)
56 static inline int cpu_numa_flags(void)
62 extern int arch_asym_cpu_priority(int cpu);
64 struct sched_domain_attr {
65 int relax_domain_level;
68 #define SD_ATTR_INIT (struct sched_domain_attr) { \
69 .relax_domain_level = -1, \
72 extern int sched_domain_level_max;
76 struct sched_domain_shared {
78 atomic_t nr_busy_cpus;
84 /* These fields must be setup */
85 struct sched_domain __rcu *parent; /* top domain must be null terminated */
86 struct sched_domain __rcu *child; /* bottom domain must be null terminated */
87 struct sched_group *groups; /* the balancing groups of the domain */
88 unsigned long min_interval; /* Minimum balance interval ms */
89 unsigned long max_interval; /* Maximum balance interval ms */
90 unsigned int busy_factor; /* less balancing by factor if busy */
91 unsigned int imbalance_pct; /* No balance until over watermark */
92 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
93 unsigned int imb_numa_nr; /* Nr running tasks that allows a NUMA imbalance */
95 int nohz_idle; /* NOHZ IDLE status */
96 int flags; /* See SD_* */
100 unsigned long last_balance; /* init to jiffies. units in jiffies */
101 unsigned int balance_interval; /* initialise to 1. units in ms. */
102 unsigned int nr_balance_failed; /* initialise to 0 */
104 /* idle_balance() stats */
105 u64 max_newidle_lb_cost;
106 unsigned long last_decay_max_lb_cost;
108 #ifdef CONFIG_SCHEDSTATS
109 /* sched_balance_rq() 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_load[CPU_MAX_IDLE_TYPES];
114 unsigned int lb_imbalance_util[CPU_MAX_IDLE_TYPES];
115 unsigned int lb_imbalance_task[CPU_MAX_IDLE_TYPES];
116 unsigned int lb_imbalance_misfit[CPU_MAX_IDLE_TYPES];
117 unsigned int lb_gained[CPU_MAX_IDLE_TYPES];
118 unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES];
119 unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES];
120 unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES];
122 /* Active load balancing */
123 unsigned int alb_count;
124 unsigned int alb_failed;
125 unsigned int alb_pushed;
127 /* SD_BALANCE_EXEC stats */
128 unsigned int sbe_count;
129 unsigned int sbe_balanced;
130 unsigned int sbe_pushed;
132 /* SD_BALANCE_FORK stats */
133 unsigned int sbf_count;
134 unsigned int sbf_balanced;
135 unsigned int sbf_pushed;
137 /* try_to_wake_up() stats */
138 unsigned int ttwu_wake_remote;
139 unsigned int ttwu_move_affine;
140 unsigned int ttwu_move_balance;
144 void *private; /* used during construction */
145 struct rcu_head rcu; /* used during destruction */
147 struct sched_domain_shared *shared;
149 unsigned int span_weight;
151 * Span of all CPUs in this domain.
153 * NOTE: this field is variable length. (Allocated dynamically
154 * by attaching extra space to the end of the structure,
155 * depending on how many CPUs the kernel has booted up with)
157 unsigned long span[];
160 static inline struct cpumask *sched_domain_span(struct sched_domain *sd)
162 return to_cpumask(sd->span);
165 extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
166 struct sched_domain_attr *dattr_new);
168 /* Allocate an array of sched domains, for partition_sched_domains(). */
169 cpumask_var_t *alloc_sched_domains(unsigned int ndoms);
170 void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms);
172 bool cpus_equal_capacity(int this_cpu, int that_cpu);
173 bool cpus_share_cache(int this_cpu, int that_cpu);
174 bool cpus_share_resources(int this_cpu, int that_cpu);
176 typedef const struct cpumask *(*sched_domain_mask_f)(int cpu);
177 typedef int (*sched_domain_flags_f)(void);
179 #define SDTL_OVERLAP 0x01
182 struct sched_domain *__percpu *sd;
183 struct sched_domain_shared *__percpu *sds;
184 struct sched_group *__percpu *sg;
185 struct sched_group_capacity *__percpu *sgc;
188 struct sched_domain_topology_level {
189 sched_domain_mask_f mask;
190 sched_domain_flags_f sd_flags;
197 extern void __init set_sched_topology(struct sched_domain_topology_level *tl);
198 extern void sched_update_asym_prefer_cpu(int cpu, int old_prio, int new_prio);
201 # define SD_INIT_NAME(type) .name = #type
203 #else /* CONFIG_SMP */
205 struct sched_domain_attr;
208 partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
209 struct sched_domain_attr *dattr_new)
213 static inline bool cpus_equal_capacity(int this_cpu, int that_cpu)
218 static inline bool cpus_share_cache(int this_cpu, int that_cpu)
223 static inline bool cpus_share_resources(int this_cpu, int that_cpu)
228 static inline void sched_update_asym_prefer_cpu(int cpu, int old_prio, int new_prio)
232 #endif /* !CONFIG_SMP */
234 #if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
235 extern void rebuild_sched_domains_energy(void);
237 static inline void rebuild_sched_domains_energy(void)
242 #ifndef arch_scale_cpu_capacity
244 * arch_scale_cpu_capacity - get the capacity scale factor of a given CPU.
245 * @cpu: the CPU in question.
247 * Return: the CPU scale factor normalized against SCHED_CAPACITY_SCALE, i.e.
250 * ----------------------------- * SCHED_CAPACITY_SCALE
251 * max(max_perf(c) : c \in CPUs)
253 static __always_inline
254 unsigned long arch_scale_cpu_capacity(int cpu)
256 return SCHED_CAPACITY_SCALE;
260 #ifndef arch_scale_hw_pressure
261 static __always_inline
262 unsigned long arch_scale_hw_pressure(int cpu)
268 #ifndef arch_update_hw_pressure
269 static __always_inline
270 void arch_update_hw_pressure(const struct cpumask *cpus,
271 unsigned long capped_frequency)
275 #ifndef arch_scale_freq_ref
276 static __always_inline
277 unsigned int arch_scale_freq_ref(int cpu)
283 static inline int task_node(const struct task_struct *p)
285 return cpu_to_node(task_cpu(p));
288 #endif /* _LINUX_SCHED_TOPOLOGY_H */