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 #define SD_BALANCE_NEWIDLE 0x0001 /* Balance when about to become idle */
15 #define SD_BALANCE_EXEC 0x0002 /* Balance on exec */
16 #define SD_BALANCE_FORK 0x0004 /* Balance on fork, clone */
17 #define SD_BALANCE_WAKE 0x0008 /* Balance on wakeup */
18 #define SD_WAKE_AFFINE 0x0010 /* Wake task to waking CPU */
19 #define SD_ASYM_CPUCAPACITY 0x0020 /* Domain members have different CPU capacities */
20 #define SD_SHARE_CPUCAPACITY 0x0040 /* Domain members share CPU capacity */
21 #define SD_SHARE_POWERDOMAIN 0x0080 /* Domain members share power domain */
22 #define SD_SHARE_PKG_RESOURCES 0x0100 /* Domain members share CPU pkg resources */
23 #define SD_SERIALIZE 0x0200 /* Only a single load balancing instance */
24 #define SD_ASYM_PACKING 0x0400 /* Place busy groups earlier in the domain */
25 #define SD_PREFER_SIBLING 0x0800 /* Prefer to place tasks in a sibling domain */
26 #define SD_OVERLAP 0x1000 /* sched_domains of this level overlap */
27 #define SD_NUMA 0x2000 /* cross-node balancing */
29 #ifdef CONFIG_SCHED_SMT
30 static inline int cpu_smt_flags(void)
32 return SD_SHARE_CPUCAPACITY | SD_SHARE_PKG_RESOURCES;
36 #ifdef CONFIG_SCHED_MC
37 static inline int cpu_core_flags(void)
39 return SD_SHARE_PKG_RESOURCES;
44 static inline int cpu_numa_flags(void)
50 extern int arch_asym_cpu_priority(int cpu);
52 struct sched_domain_attr {
53 int relax_domain_level;
56 #define SD_ATTR_INIT (struct sched_domain_attr) { \
57 .relax_domain_level = -1, \
60 extern int sched_domain_level_max;
64 struct sched_domain_shared {
66 atomic_t nr_busy_cpus;
71 /* These fields must be setup */
72 struct sched_domain __rcu *parent; /* top domain must be null terminated */
73 struct sched_domain __rcu *child; /* bottom domain must be null terminated */
74 struct sched_group *groups; /* the balancing groups of the domain */
75 unsigned long min_interval; /* Minimum balance interval ms */
76 unsigned long max_interval; /* Maximum balance interval ms */
77 unsigned int busy_factor; /* less balancing by factor if busy */
78 unsigned int imbalance_pct; /* No balance until over watermark */
79 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
81 int nohz_idle; /* NOHZ IDLE status */
82 int flags; /* See SD_* */
86 unsigned long last_balance; /* init to jiffies. units in jiffies */
87 unsigned int balance_interval; /* initialise to 1. units in ms. */
88 unsigned int nr_balance_failed; /* initialise to 0 */
90 /* idle_balance() stats */
91 u64 max_newidle_lb_cost;
92 unsigned long next_decay_max_lb_cost;
94 u64 avg_scan_cost; /* select_idle_sibling */
96 #ifdef CONFIG_SCHEDSTATS
97 /* load_balance() stats */
98 unsigned int lb_count[CPU_MAX_IDLE_TYPES];
99 unsigned int lb_failed[CPU_MAX_IDLE_TYPES];
100 unsigned int lb_balanced[CPU_MAX_IDLE_TYPES];
101 unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES];
102 unsigned int lb_gained[CPU_MAX_IDLE_TYPES];
103 unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES];
104 unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES];
105 unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES];
107 /* Active load balancing */
108 unsigned int alb_count;
109 unsigned int alb_failed;
110 unsigned int alb_pushed;
112 /* SD_BALANCE_EXEC stats */
113 unsigned int sbe_count;
114 unsigned int sbe_balanced;
115 unsigned int sbe_pushed;
117 /* SD_BALANCE_FORK stats */
118 unsigned int sbf_count;
119 unsigned int sbf_balanced;
120 unsigned int sbf_pushed;
122 /* try_to_wake_up() stats */
123 unsigned int ttwu_wake_remote;
124 unsigned int ttwu_move_affine;
125 unsigned int ttwu_move_balance;
127 #ifdef CONFIG_SCHED_DEBUG
131 void *private; /* used during construction */
132 struct rcu_head rcu; /* used during destruction */
134 struct sched_domain_shared *shared;
136 unsigned int span_weight;
138 * Span of all CPUs in this domain.
140 * NOTE: this field is variable length. (Allocated dynamically
141 * by attaching extra space to the end of the structure,
142 * depending on how many CPUs the kernel has booted up with)
144 unsigned long span[];
147 static inline struct cpumask *sched_domain_span(struct sched_domain *sd)
149 return to_cpumask(sd->span);
152 extern void partition_sched_domains_locked(int ndoms_new,
153 cpumask_var_t doms_new[],
154 struct sched_domain_attr *dattr_new);
156 extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
157 struct sched_domain_attr *dattr_new);
159 /* Allocate an array of sched domains, for partition_sched_domains(). */
160 cpumask_var_t *alloc_sched_domains(unsigned int ndoms);
161 void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms);
163 bool cpus_share_cache(int this_cpu, int that_cpu);
165 typedef const struct cpumask *(*sched_domain_mask_f)(int cpu);
166 typedef int (*sched_domain_flags_f)(void);
168 #define SDTL_OVERLAP 0x01
171 struct sched_domain *__percpu *sd;
172 struct sched_domain_shared *__percpu *sds;
173 struct sched_group *__percpu *sg;
174 struct sched_group_capacity *__percpu *sgc;
177 struct sched_domain_topology_level {
178 sched_domain_mask_f mask;
179 sched_domain_flags_f sd_flags;
183 #ifdef CONFIG_SCHED_DEBUG
188 extern void set_sched_topology(struct sched_domain_topology_level *tl);
190 #ifdef CONFIG_SCHED_DEBUG
191 # define SD_INIT_NAME(type) .name = #type
193 # define SD_INIT_NAME(type)
196 #else /* CONFIG_SMP */
198 struct sched_domain_attr;
201 partition_sched_domains_locked(int ndoms_new, cpumask_var_t doms_new[],
202 struct sched_domain_attr *dattr_new)
207 partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
208 struct sched_domain_attr *dattr_new)
212 static inline bool cpus_share_cache(int this_cpu, int that_cpu)
217 #endif /* !CONFIG_SMP */
219 #ifndef arch_scale_cpu_capacity
221 * arch_scale_cpu_capacity - get the capacity scale factor of a given CPU.
222 * @cpu: the CPU in question.
224 * Return: the CPU scale factor normalized against SCHED_CAPACITY_SCALE, i.e.
227 * ----------------------------- * SCHED_CAPACITY_SCALE
228 * max(max_perf(c) : c \in CPUs)
230 static __always_inline
231 unsigned long arch_scale_cpu_capacity(int cpu)
233 return SCHED_CAPACITY_SCALE;
237 #ifndef arch_scale_thermal_pressure
238 static __always_inline
239 unsigned long arch_scale_thermal_pressure(int cpu)
245 #ifndef arch_set_thermal_pressure
246 static __always_inline
247 void arch_set_thermal_pressure(const struct cpumask *cpus,
248 unsigned long th_pressure)
252 static inline int task_node(const struct task_struct *p)
254 return cpu_to_node(task_cpu(p));
257 #endif /* _LINUX_SCHED_TOPOLOGY_H */