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