include/linux/sched/topology.h

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