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_PKG_RESOURCES 0x0080 /* Domain members share CPU pkg resources */
22 #define SD_SERIALIZE 0x0100 /* Only a single load balancing instance */
23 #define SD_ASYM_PACKING 0x0200 /* Place busy groups earlier in the domain */
24 #define SD_PREFER_SIBLING 0x0400 /* Prefer to place tasks in a sibling domain */
25 #define SD_OVERLAP 0x0800 /* sched_domains of this level overlap */
26 #define SD_NUMA 0x1000 /* cross-node balancing */
28 #ifdef CONFIG_SCHED_SMT
29 static inline int cpu_smt_flags(void)
31 return SD_SHARE_CPUCAPACITY | SD_SHARE_PKG_RESOURCES;
35 #ifdef CONFIG_SCHED_MC
36 static inline int cpu_core_flags(void)
38 return SD_SHARE_PKG_RESOURCES;
43 static inline int cpu_numa_flags(void)
49 extern int arch_asym_cpu_priority(int cpu);
51 struct sched_domain_attr {
52 int relax_domain_level;
55 #define SD_ATTR_INIT (struct sched_domain_attr) { \
56 .relax_domain_level = -1, \
59 extern int sched_domain_level_max;
63 struct sched_domain_shared {
65 atomic_t nr_busy_cpus;
70 /* These fields must be setup */
71 struct sched_domain __rcu *parent; /* top domain must be null terminated */
72 struct sched_domain __rcu *child; /* bottom domain must be null terminated */
73 struct sched_group *groups; /* the balancing groups of the domain */
74 unsigned long min_interval; /* Minimum balance interval ms */
75 unsigned long max_interval; /* Maximum balance interval ms */
76 unsigned int busy_factor; /* less balancing by factor if busy */
77 unsigned int imbalance_pct; /* No balance until over watermark */
78 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
80 int nohz_idle; /* NOHZ IDLE status */
81 int flags; /* See SD_* */
85 unsigned long last_balance; /* init to jiffies. units in jiffies */
86 unsigned int balance_interval; /* initialise to 1. units in ms. */
87 unsigned int nr_balance_failed; /* initialise to 0 */
89 /* idle_balance() stats */
90 u64 max_newidle_lb_cost;
91 unsigned long next_decay_max_lb_cost;
93 u64 avg_scan_cost; /* select_idle_sibling */
95 #ifdef CONFIG_SCHEDSTATS
96 /* load_balance() stats */
97 unsigned int lb_count[CPU_MAX_IDLE_TYPES];
98 unsigned int lb_failed[CPU_MAX_IDLE_TYPES];
99 unsigned int lb_balanced[CPU_MAX_IDLE_TYPES];
100 unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES];
101 unsigned int lb_gained[CPU_MAX_IDLE_TYPES];
102 unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES];
103 unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES];
104 unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES];
106 /* Active load balancing */
107 unsigned int alb_count;
108 unsigned int alb_failed;
109 unsigned int alb_pushed;
111 /* SD_BALANCE_EXEC stats */
112 unsigned int sbe_count;
113 unsigned int sbe_balanced;
114 unsigned int sbe_pushed;
116 /* SD_BALANCE_FORK stats */
117 unsigned int sbf_count;
118 unsigned int sbf_balanced;
119 unsigned int sbf_pushed;
121 /* try_to_wake_up() stats */
122 unsigned int ttwu_wake_remote;
123 unsigned int ttwu_move_affine;
124 unsigned int ttwu_move_balance;
126 #ifdef CONFIG_SCHED_DEBUG
130 void *private; /* used during construction */
131 struct rcu_head rcu; /* used during destruction */
133 struct sched_domain_shared *shared;
135 unsigned int span_weight;
137 * Span of all CPUs in this domain.
139 * NOTE: this field is variable length. (Allocated dynamically
140 * by attaching extra space to the end of the structure,
141 * depending on how many CPUs the kernel has booted up with)
143 unsigned long span[];
146 static inline struct cpumask *sched_domain_span(struct sched_domain *sd)
148 return to_cpumask(sd->span);
151 extern void partition_sched_domains_locked(int ndoms_new,
152 cpumask_var_t doms_new[],
153 struct sched_domain_attr *dattr_new);
155 extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
156 struct sched_domain_attr *dattr_new);
158 /* Allocate an array of sched domains, for partition_sched_domains(). */
159 cpumask_var_t *alloc_sched_domains(unsigned int ndoms);
160 void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms);
162 bool cpus_share_cache(int this_cpu, int that_cpu);
164 typedef const struct cpumask *(*sched_domain_mask_f)(int cpu);
165 typedef int (*sched_domain_flags_f)(void);
167 #define SDTL_OVERLAP 0x01
170 struct sched_domain *__percpu *sd;
171 struct sched_domain_shared *__percpu *sds;
172 struct sched_group *__percpu *sg;
173 struct sched_group_capacity *__percpu *sgc;
176 struct sched_domain_topology_level {
177 sched_domain_mask_f mask;
178 sched_domain_flags_f sd_flags;
182 #ifdef CONFIG_SCHED_DEBUG
187 extern void set_sched_topology(struct sched_domain_topology_level *tl);
189 #ifdef CONFIG_SCHED_DEBUG
190 # define SD_INIT_NAME(type) .name = #type
192 # define SD_INIT_NAME(type)
195 #else /* CONFIG_SMP */
197 struct sched_domain_attr;
200 partition_sched_domains_locked(int ndoms_new, cpumask_var_t doms_new[],
201 struct sched_domain_attr *dattr_new)
206 partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
207 struct sched_domain_attr *dattr_new)
211 static inline bool cpus_share_cache(int this_cpu, int that_cpu)
216 #endif /* !CONFIG_SMP */
218 #ifndef arch_scale_cpu_capacity
220 * arch_scale_cpu_capacity - get the capacity scale factor of a given CPU.
221 * @cpu: the CPU in question.
223 * Return: the CPU scale factor normalized against SCHED_CAPACITY_SCALE, i.e.
226 * ----------------------------- * SCHED_CAPACITY_SCALE
227 * max(max_perf(c) : c \in CPUs)
229 static __always_inline
230 unsigned long arch_scale_cpu_capacity(int cpu)
232 return SCHED_CAPACITY_SCALE;
236 #ifndef arch_scale_thermal_pressure
237 static __always_inline
238 unsigned long arch_scale_thermal_pressure(int cpu)
244 #ifndef arch_set_thermal_pressure
245 static __always_inline
246 void arch_set_thermal_pressure(const struct cpumask *cpus,
247 unsigned long th_pressure)
251 static inline int task_node(const struct task_struct *p)
253 return cpu_to_node(task_cpu(p));
256 #endif /* _LINUX_SCHED_TOPOLOGY_H */