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 #ifdef CONFIG_SCHED_DEBUG
30 struct sd_flag_debug {
31 unsigned int meta_flags;
34 extern const struct sd_flag_debug sd_flag_debug[];
38 #ifdef CONFIG_SCHED_SMT
39 static inline int cpu_smt_flags(void)
41 return SD_SHARE_CPUCAPACITY | SD_SHARE_PKG_RESOURCES;
45 #ifdef CONFIG_SCHED_CLUSTER
46 static inline int cpu_cluster_flags(void)
48 return SD_CLUSTER | SD_SHARE_PKG_RESOURCES;
52 #ifdef CONFIG_SCHED_MC
53 static inline int cpu_core_flags(void)
55 return SD_SHARE_PKG_RESOURCES;
60 static inline int cpu_numa_flags(void)
66 extern int arch_asym_cpu_priority(int cpu);
68 struct sched_domain_attr {
69 int relax_domain_level;
72 #define SD_ATTR_INIT (struct sched_domain_attr) { \
73 .relax_domain_level = -1, \
76 extern int sched_domain_level_max;
80 struct sched_domain_shared {
82 atomic_t nr_busy_cpus;
88 /* These fields must be setup */
89 struct sched_domain __rcu *parent; /* top domain must be null terminated */
90 struct sched_domain __rcu *child; /* bottom domain must be null terminated */
91 struct sched_group *groups; /* the balancing groups of the domain */
92 unsigned long min_interval; /* Minimum balance interval ms */
93 unsigned long max_interval; /* Maximum balance interval ms */
94 unsigned int busy_factor; /* less balancing by factor if busy */
95 unsigned int imbalance_pct; /* No balance until over watermark */
96 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
97 unsigned int imb_numa_nr; /* Nr running tasks that allows a NUMA imbalance */
99 int nohz_idle; /* NOHZ IDLE status */
100 int flags; /* See SD_* */
103 /* Runtime fields. */
104 unsigned long last_balance; /* init to jiffies. units in jiffies */
105 unsigned int balance_interval; /* initialise to 1. units in ms. */
106 unsigned int nr_balance_failed; /* initialise to 0 */
108 /* idle_balance() stats */
109 u64 max_newidle_lb_cost;
110 unsigned long last_decay_max_lb_cost;
112 #ifdef CONFIG_SCHEDSTATS
113 /* load_balance() stats */
114 unsigned int lb_count[CPU_MAX_IDLE_TYPES];
115 unsigned int lb_failed[CPU_MAX_IDLE_TYPES];
116 unsigned int lb_balanced[CPU_MAX_IDLE_TYPES];
117 unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES];
118 unsigned int lb_gained[CPU_MAX_IDLE_TYPES];
119 unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES];
120 unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES];
121 unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES];
123 /* Active load balancing */
124 unsigned int alb_count;
125 unsigned int alb_failed;
126 unsigned int alb_pushed;
128 /* SD_BALANCE_EXEC stats */
129 unsigned int sbe_count;
130 unsigned int sbe_balanced;
131 unsigned int sbe_pushed;
133 /* SD_BALANCE_FORK stats */
134 unsigned int sbf_count;
135 unsigned int sbf_balanced;
136 unsigned int sbf_pushed;
138 /* try_to_wake_up() stats */
139 unsigned int ttwu_wake_remote;
140 unsigned int ttwu_move_affine;
141 unsigned int ttwu_move_balance;
143 #ifdef CONFIG_SCHED_DEBUG
147 void *private; /* used during construction */
148 struct rcu_head rcu; /* used during destruction */
150 struct sched_domain_shared *shared;
152 unsigned int span_weight;
154 * Span of all CPUs in this domain.
156 * NOTE: this field is variable length. (Allocated dynamically
157 * by attaching extra space to the end of the structure,
158 * depending on how many CPUs the kernel has booted up with)
160 unsigned long span[];
163 static inline struct cpumask *sched_domain_span(struct sched_domain *sd)
165 return to_cpumask(sd->span);
168 extern void partition_sched_domains_locked(int ndoms_new,
169 cpumask_var_t doms_new[],
170 struct sched_domain_attr *dattr_new);
172 extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
173 struct sched_domain_attr *dattr_new);
175 /* Allocate an array of sched domains, for partition_sched_domains(). */
176 cpumask_var_t *alloc_sched_domains(unsigned int ndoms);
177 void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms);
179 bool cpus_share_cache(int this_cpu, int that_cpu);
180 bool cpus_share_resources(int this_cpu, int that_cpu);
182 typedef const struct cpumask *(*sched_domain_mask_f)(int cpu);
183 typedef int (*sched_domain_flags_f)(void);
185 #define SDTL_OVERLAP 0x01
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;
194 struct sched_domain_topology_level {
195 sched_domain_mask_f mask;
196 sched_domain_flags_f sd_flags;
200 #ifdef CONFIG_SCHED_DEBUG
205 extern void __init set_sched_topology(struct sched_domain_topology_level *tl);
207 #ifdef CONFIG_SCHED_DEBUG
208 # define SD_INIT_NAME(type) .name = #type
210 # define SD_INIT_NAME(type)
213 #else /* CONFIG_SMP */
215 struct sched_domain_attr;
218 partition_sched_domains_locked(int ndoms_new, cpumask_var_t doms_new[],
219 struct sched_domain_attr *dattr_new)
224 partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
225 struct sched_domain_attr *dattr_new)
229 static inline bool cpus_share_cache(int this_cpu, int that_cpu)
234 static inline bool cpus_share_resources(int this_cpu, int that_cpu)
239 #endif /* !CONFIG_SMP */
241 #if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
242 extern void rebuild_sched_domains_energy(void);
244 static inline void rebuild_sched_domains_energy(void)
249 #ifndef arch_scale_cpu_capacity
251 * arch_scale_cpu_capacity - get the capacity scale factor of a given CPU.
252 * @cpu: the CPU in question.
254 * Return: the CPU scale factor normalized against SCHED_CAPACITY_SCALE, i.e.
257 * ----------------------------- * SCHED_CAPACITY_SCALE
258 * max(max_perf(c) : c \in CPUs)
260 static __always_inline
261 unsigned long arch_scale_cpu_capacity(int cpu)
263 return SCHED_CAPACITY_SCALE;
267 #ifndef arch_scale_thermal_pressure
268 static __always_inline
269 unsigned long arch_scale_thermal_pressure(int cpu)
275 #ifndef arch_update_thermal_pressure
276 static __always_inline
277 void arch_update_thermal_pressure(const struct cpumask *cpus,
278 unsigned long capped_frequency)
282 #ifndef arch_scale_freq_ref
283 static __always_inline
284 unsigned int arch_scale_freq_ref(int cpu)
290 static inline int task_node(const struct task_struct *p)
292 return cpu_to_node(task_cpu(p));
295 #endif /* _LINUX_SCHED_TOPOLOGY_H */