1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_SCHED_TOPOLOGY_H
3 #define _LINUX_SCHED_TOPOLOGY_H
4
5 #include <linux/topology.h>
6
7 #include <linux/sched/idle.h>
8
9 /*
10 * sched-domains (multiprocessor balancing) declarations:
11 */
12 #ifdef CONFIG_SMP
13
14 #define SD_LOAD_BALANCE 0x0001 /* Do load balancing on this domain. */
15 #define SD_BALANCE_NEWIDLE 0x0002 /* Balance when about to become idle */
16 #define SD_BALANCE_EXEC 0x0004 /* Balance on exec */
17 #define SD_BALANCE_FORK 0x0008 /* Balance on fork, clone */
18 #define SD_BALANCE_WAKE 0x0010 /* Balance on wakeup */
19 #define SD_WAKE_AFFINE 0x0020 /* Wake task to waking CPU */
20 #define SD_ASYM_CPUCAPACITY 0x0040 /* Domain members have different CPU capacities */
21 #define SD_SHARE_CPUCAPACITY 0x0080 /* Domain members share CPU capacity */
22 #define SD_SHARE_POWERDOMAIN 0x0100 /* Domain members share power domain */
23 #define SD_SHARE_PKG_RESOURCES 0x0200 /* Domain members share CPU pkg resources */
24 #define SD_SERIALIZE 0x0400 /* Only a single load balancing instance */
25 #define SD_ASYM_PACKING 0x0800 /* Place busy groups earlier in the domain */
26 #define SD_PREFER_SIBLING 0x1000 /* Prefer to place tasks in a sibling domain */
27 #define SD_OVERLAP 0x2000 /* sched_domains of this level overlap */
28 #define SD_NUMA 0x4000 /* cross-node balancing */
29
30 #ifdef CONFIG_SCHED_SMT
cpu_smt_flags(void)31 static inline int cpu_smt_flags(void)
32 {
33 return SD_SHARE_CPUCAPACITY | SD_SHARE_PKG_RESOURCES;
34 }
35 #endif
36
37 #ifdef CONFIG_SCHED_MC
cpu_core_flags(void)38 static inline int cpu_core_flags(void)
39 {
40 return SD_SHARE_PKG_RESOURCES;
41 }
42 #endif
43
44 #ifdef CONFIG_NUMA
cpu_numa_flags(void)45 static inline int cpu_numa_flags(void)
46 {
47 return SD_NUMA;
48 }
49 #endif
50
51 extern int arch_asym_cpu_priority(int cpu);
52
53 struct sched_domain_attr {
54 int relax_domain_level;
55 };
56
57 #define SD_ATTR_INIT (struct sched_domain_attr) { \
58 .relax_domain_level = -1, \
59 }
60
61 extern int sched_domain_level_max;
62
63 struct sched_group;
64
65 struct sched_domain_shared {
66 atomic_t ref;
67 atomic_t nr_busy_cpus;
68 int has_idle_cores;
69 };
70
71 struct sched_domain {
72 /* These fields must be setup */
73 struct sched_domain __rcu *parent; /* top domain must be null terminated */
74 struct sched_domain __rcu *child; /* bottom domain must be null terminated */
75 struct sched_group *groups; /* the balancing groups of the domain */
76 unsigned long min_interval; /* Minimum balance interval ms */
77 unsigned long max_interval; /* Maximum balance interval ms */
78 unsigned int busy_factor; /* less balancing by factor if busy */
79 unsigned int imbalance_pct; /* No balance until over watermark */
80 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
81
82 int nohz_idle; /* NOHZ IDLE status */
83 int flags; /* See SD_* */
84 int level;
85
86 /* Runtime fields. */
87 unsigned long last_balance; /* init to jiffies. units in jiffies */
88 unsigned int balance_interval; /* initialise to 1. units in ms. */
89 unsigned int nr_balance_failed; /* initialise to 0 */
90
91 /* idle_balance() stats */
92 u64 max_newidle_lb_cost;
93 unsigned long next_decay_max_lb_cost;
94
95 u64 avg_scan_cost; /* select_idle_sibling */
96
97 #ifdef CONFIG_SCHEDSTATS
98 /* load_balance() stats */
99 unsigned int lb_count[CPU_MAX_IDLE_TYPES];
100 unsigned int lb_failed[CPU_MAX_IDLE_TYPES];
101 unsigned int lb_balanced[CPU_MAX_IDLE_TYPES];
102 unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES];
103 unsigned int lb_gained[CPU_MAX_IDLE_TYPES];
104 unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES];
105 unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES];
106 unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES];
107
108 /* Active load balancing */
109 unsigned int alb_count;
110 unsigned int alb_failed;
111 unsigned int alb_pushed;
112
113 /* SD_BALANCE_EXEC stats */
114 unsigned int sbe_count;
115 unsigned int sbe_balanced;
116 unsigned int sbe_pushed;
117
118 /* SD_BALANCE_FORK stats */
119 unsigned int sbf_count;
120 unsigned int sbf_balanced;
121 unsigned int sbf_pushed;
122
123 /* try_to_wake_up() stats */
124 unsigned int ttwu_wake_remote;
125 unsigned int ttwu_move_affine;
126 unsigned int ttwu_move_balance;
127 #endif
128 #ifdef CONFIG_SCHED_DEBUG
129 char *name;
130 #endif
131 union {
132 void *private; /* used during construction */
133 struct rcu_head rcu; /* used during destruction */
134 };
135 struct sched_domain_shared *shared;
136
137 unsigned int span_weight;
138 /*
139 * Span of all CPUs in this domain.
140 *
141 * NOTE: this field is variable length. (Allocated dynamically
142 * by attaching extra space to the end of the structure,
143 * depending on how many CPUs the kernel has booted up with)
144 */
145 unsigned long span[0];
146 };
147
sched_domain_span(struct sched_domain * sd)148 static inline struct cpumask *sched_domain_span(struct sched_domain *sd)
149 {
150 return to_cpumask(sd->span);
151 }
152
153 extern void partition_sched_domains_locked(int ndoms_new,
154 cpumask_var_t doms_new[],
155 struct sched_domain_attr *dattr_new);
156
157 extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
158 struct sched_domain_attr *dattr_new);
159
160 /* Allocate an array of sched domains, for partition_sched_domains(). */
161 cpumask_var_t *alloc_sched_domains(unsigned int ndoms);
162 void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms);
163
164 bool cpus_share_cache(int this_cpu, int that_cpu);
165
166 typedef const struct cpumask *(*sched_domain_mask_f)(int cpu);
167 typedef int (*sched_domain_flags_f)(void);
168
169 #define SDTL_OVERLAP 0x01
170
171 struct sd_data {
172 struct sched_domain *__percpu *sd;
173 struct sched_domain_shared *__percpu *sds;
174 struct sched_group *__percpu *sg;
175 struct sched_group_capacity *__percpu *sgc;
176 };
177
178 struct sched_domain_topology_level {
179 sched_domain_mask_f mask;
180 sched_domain_flags_f sd_flags;
181 int flags;
182 int numa_level;
183 struct sd_data data;
184 #ifdef CONFIG_SCHED_DEBUG
185 char *name;
186 #endif
187 };
188
189 extern void set_sched_topology(struct sched_domain_topology_level *tl);
190
191 #ifdef CONFIG_SCHED_DEBUG
192 # define SD_INIT_NAME(type) .name = #type
193 #else
194 # define SD_INIT_NAME(type)
195 #endif
196
197 #else /* CONFIG_SMP */
198
199 struct sched_domain_attr;
200
201 static inline void
partition_sched_domains_locked(int ndoms_new,cpumask_var_t doms_new[],struct sched_domain_attr * dattr_new)202 partition_sched_domains_locked(int ndoms_new, cpumask_var_t doms_new[],
203 struct sched_domain_attr *dattr_new)
204 {
205 }
206
207 static inline void
partition_sched_domains(int ndoms_new,cpumask_var_t doms_new[],struct sched_domain_attr * dattr_new)208 partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
209 struct sched_domain_attr *dattr_new)
210 {
211 }
212
cpus_share_cache(int this_cpu,int that_cpu)213 static inline bool cpus_share_cache(int this_cpu, int that_cpu)
214 {
215 return true;
216 }
217
218 #endif /* !CONFIG_SMP */
219
220 #ifndef arch_scale_cpu_capacity
221 static __always_inline
arch_scale_cpu_capacity(int cpu)222 unsigned long arch_scale_cpu_capacity(int cpu)
223 {
224 return SCHED_CAPACITY_SCALE;
225 }
226 #endif
227
task_node(const struct task_struct * p)228 static inline int task_node(const struct task_struct *p)
229 {
230 return cpu_to_node(task_cpu(p));
231 }
232
233 #endif /* _LINUX_SCHED_TOPOLOGY_H */
234
