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Release 4.12 include/linux/sched/topology.h



#include <linux/topology.h>

#include <linux/sched/idle.h>

 * sched-domains (multiprocessor balancing) declarations:

#define SD_LOAD_BALANCE		0x0001	
/* Do load balancing on this domain. */

#define SD_BALANCE_NEWIDLE	0x0002	
/* Balance when about to become idle */

#define SD_BALANCE_EXEC		0x0004	
/* Balance on exec */

#define SD_BALANCE_FORK		0x0008	
/* Balance on fork, clone */

#define SD_BALANCE_WAKE		0x0010  
/* Balance on wakeup */

#define SD_WAKE_AFFINE		0x0020	
/* Wake task to waking CPU */

#define SD_ASYM_CPUCAPACITY	0x0040  
/* Groups have different max cpu capacities */

#define SD_SHARE_CPUCAPACITY	0x0080	
/* Domain members share cpu capacity */

#define SD_SHARE_POWERDOMAIN	0x0100	
/* Domain members share power domain */

#define SD_SHARE_PKG_RESOURCES	0x0200	
/* Domain members share cpu pkg resources */

#define SD_SERIALIZE		0x0400	
/* Only a single load balancing instance */

#define SD_ASYM_PACKING		0x0800  
/* Place busy groups earlier in the domain */

#define SD_PREFER_SIBLING	0x1000	
/* Prefer to place tasks in a sibling domain */

#define SD_OVERLAP		0x2000	
/* sched_domains of this level overlap */

#define SD_NUMA			0x4000	
/* cross-node balancing */

 * Increase resolution of cpu_capacity calculations




static inline int cpu_smt_flags(void) { return SD_SHARE_CPUCAPACITY | SD_SHARE_PKG_RESOURCES; }


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#endif #ifdef CONFIG_SCHED_MC
static inline int cpu_core_flags(void) { return SD_SHARE_PKG_RESOURCES; }


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#endif #ifdef CONFIG_NUMA
static inline int cpu_numa_flags(void) { return SD_NUMA; }


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#endif extern int arch_asym_cpu_priority(int cpu); struct sched_domain_attr { int relax_domain_level; }; #define SD_ATTR_INIT (struct sched_domain_attr) { \ .relax_domain_level = -1, \ } extern int sched_domain_level_max; struct sched_group; struct sched_domain_shared { atomic_t ref; atomic_t nr_busy_cpus; int has_idle_cores; }; struct sched_domain { /* These fields must be setup */ struct sched_domain *parent; /* top domain must be null terminated */ struct sched_domain *child; /* bottom domain must be null terminated */ struct sched_group *groups; /* the balancing groups of the domain */ unsigned long min_interval; /* Minimum balance interval ms */ unsigned long max_interval; /* Maximum balance interval ms */ unsigned int busy_factor; /* less balancing by factor if busy */ unsigned int imbalance_pct; /* No balance until over watermark */ unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */ unsigned int busy_idx; unsigned int idle_idx; unsigned int newidle_idx; unsigned int wake_idx; unsigned int forkexec_idx; unsigned int smt_gain; int nohz_idle; /* NOHZ IDLE status */ int flags; /* See SD_* */ int level; /* Runtime fields. */ unsigned long last_balance; /* init to jiffies. units in jiffies */ unsigned int balance_interval; /* initialise to 1. units in ms. */ unsigned int nr_balance_failed; /* initialise to 0 */ /* idle_balance() stats */ u64 max_newidle_lb_cost; unsigned long next_decay_max_lb_cost; u64 avg_scan_cost; /* select_idle_sibling */ #ifdef CONFIG_SCHEDSTATS /* load_balance() stats */ unsigned int lb_count[CPU_MAX_IDLE_TYPES]; unsigned int lb_failed[CPU_MAX_IDLE_TYPES]; unsigned int lb_balanced[CPU_MAX_IDLE_TYPES]; unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES]; unsigned int lb_gained[CPU_MAX_IDLE_TYPES]; unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES]; unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES]; unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES]; /* Active load balancing */ unsigned int alb_count; unsigned int alb_failed; unsigned int alb_pushed; /* SD_BALANCE_EXEC stats */ unsigned int sbe_count; unsigned int sbe_balanced; unsigned int sbe_pushed; /* SD_BALANCE_FORK stats */ unsigned int sbf_count; unsigned int sbf_balanced; unsigned int sbf_pushed; /* try_to_wake_up() stats */ unsigned int ttwu_wake_remote; unsigned int ttwu_move_affine; unsigned int ttwu_move_balance; #endif #ifdef CONFIG_SCHED_DEBUG char *name; #endif union { void *private; /* used during construction */ struct rcu_head rcu; /* used during destruction */ }; struct sched_domain_shared *shared; unsigned int span_weight; /* * Span of all CPUs in this domain. * * NOTE: this field is variable length. (Allocated dynamically * by attaching extra space to the end of the structure, * depending on how many CPUs the kernel has booted up with) */ unsigned long span[0]; };
static inline struct cpumask *sched_domain_span(struct sched_domain *sd) { return to_cpumask(sd->span); }


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extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[], struct sched_domain_attr *dattr_new); /* Allocate an array of sched domains, for partition_sched_domains(). */ cpumask_var_t *alloc_sched_domains(unsigned int ndoms); void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms); bool cpus_share_cache(int this_cpu, int that_cpu); typedef const struct cpumask *(*sched_domain_mask_f)(int cpu); typedef int (*sched_domain_flags_f)(void); #define SDTL_OVERLAP 0x01 struct sd_data { struct sched_domain **__percpu sd; struct sched_domain_shared **__percpu sds; struct sched_group **__percpu sg; struct sched_group_capacity **__percpu sgc; }; struct sched_domain_topology_level { sched_domain_mask_f mask; sched_domain_flags_f sd_flags; int flags; int numa_level; struct sd_data data; #ifdef CONFIG_SCHED_DEBUG char *name; #endif }; extern void set_sched_topology(struct sched_domain_topology_level *tl); #ifdef CONFIG_SCHED_DEBUG # define SD_INIT_NAME(type) .name = #type #else # define SD_INIT_NAME(type) #endif #else /* CONFIG_SMP */ struct sched_domain_attr;
static inline void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[], struct sched_domain_attr *dattr_new) { }


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static inline bool cpus_share_cache(int this_cpu, int that_cpu) { return true; }


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#endif /* !CONFIG_SMP */
static inline int task_node(const struct task_struct *p) { return cpu_to_node(task_cpu(p)); }


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