sched/headers: Move scheduler topology interfaces to <linux/sched/topology.h>
The vast majority of sched.h users does not require the topology types and
interfaces, so split them out into <linux/sched/topology.h>.
This reduces the size of linux/sched.h by ~6%.
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
diff --git a/include/linux/sched/topology.h b/include/linux/sched/topology.h
index 184b56b..b3550b3 100644
--- a/include/linux/sched/topology.h
+++ b/include/linux/sched/topology.h
@@ -5,4 +5,217 @@
#include <linux/sched/idle.h>
+/*
+ * sched-domains (multiprocessor balancing) declarations:
+ */
+#ifdef CONFIG_SMP
+
+#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
+ */
+#define SCHED_CAPACITY_SHIFT SCHED_FIXEDPOINT_SHIFT
+#define SCHED_CAPACITY_SCALE (1L << SCHED_CAPACITY_SHIFT)
+
+#ifdef CONFIG_SCHED_SMT
+static inline int cpu_smt_flags(void)
+{
+ return SD_SHARE_CPUCAPACITY | SD_SHARE_PKG_RESOURCES;
+}
+#endif
+
+#ifdef CONFIG_SCHED_MC
+static inline int cpu_core_flags(void)
+{
+ return SD_SHARE_PKG_RESOURCES;
+}
+#endif
+
+#ifdef CONFIG_NUMA
+static inline int cpu_numa_flags(void)
+{
+ return SD_NUMA;
+}
+#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);
+}
+
+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)
+{
+}
+
+static inline bool cpus_share_cache(int this_cpu, int that_cpu)
+{
+ return true;
+}
+
+#endif /* !CONFIG_SMP */
+
#endif /* _LINUX_SCHED_TOPOLOGY_H */