#ifndef _LINUX_COMPACTION_H#define _LINUX_COMPACTION_H /* Return values for compact_zone() and try_to_compact_pages() *//* compaction didn't start as it was deferred due to past failures */#define COMPACT_DEFERRED	0/* compaction didn't start as it was not possible or direct reclaim was more suitable */#define COMPACT_SKIPPED		1/* compaction should continue to another pageblock */#define COMPACT_CONTINUE	2/* direct compaction partially compacted a zone and there are suitable pages */#define COMPACT_PARTIAL		3/* The full zone was compacted */#define COMPACT_COMPLETE	4/* For more detailed tracepoint output */#define COMPACT_NO_SUITABLE_PAGE	5#define COMPACT_NOT_SUITABLE_ZONE	6#define COMPACT_CONTENDED		7/* When adding new states, please adjust include/trace/events/compaction.h */ /* Used to signal whether compaction detected need_sched() or lock contention *//* No contention detected */#define COMPACT_CONTENDED_NONE	0/* Either need_sched() was true or fatal signal pending */#define COMPACT_CONTENDED_SCHED	1/* Zone lock or lru_lock was contended in async compaction */#define COMPACT_CONTENDED_LOCK	2 struct alloc_context; /* in mm/internal.h */ #ifdef CONFIG_COMPACTIONextern int sysctl_compact_memory;extern int sysctl_compaction_handler(struct ctl_table *table, int write,			void __user *buffer, size_t *length, loff_t *ppos);extern int sysctl_extfrag_threshold;extern int sysctl_extfrag_handler(struct ctl_table *table, int write,			void __user *buffer, size_t *length, loff_t *ppos);extern int sysctl_compact_unevictable_allowed; extern int fragmentation_index(struct zone *zone, unsigned int order);extern unsigned long try_to_compact_pages(gfp_t gfp_mask, unsigned int order,			int alloc_flags, const struct alloc_context *ac,			enum migrate_mode mode, int *contended);extern void compact_pgdat(pg_data_t *pgdat, int order);extern void reset_isolation_suitable(pg_data_t *pgdat);extern unsigned long compaction_suitable(struct zone *zone, int order,					int alloc_flags, int classzone_idx); extern void defer_compaction(struct zone *zone, int order);extern bool compaction_deferred(struct zone *zone, int order);extern void compaction_defer_reset(struct zone *zone, int order,				bool alloc_success);extern bool compaction_restarting(struct zone *zone, int order); #elsestatic inline unsigned long try_to_compact_pages(gfp_t gfp_mask,			unsigned int order, int alloc_flags,			const struct alloc_context *ac,			enum migrate_mode mode, int *contended){	return COMPACT_CONTINUE;} static inline void compact_pgdat(pg_data_t *pgdat, int order){} static inline void reset_isolation_suitable(pg_data_t *pgdat){} static inline unsigned long compaction_suitable(struct zone *zone, int order,					int alloc_flags, int classzone_idx){	return COMPACT_SKIPPED;} static inline void defer_compaction(struct zone *zone, int order){} static inline bool compaction_deferred(struct zone *zone, int order){	return true;} #endif /* CONFIG_COMPACTION */ #if defined(CONFIG_COMPACTION) && defined(CONFIG_SYSFS) && defined(CONFIG_NUMA)extern int compaction_register_node(struct node *node);extern void compaction_unregister_node(struct node *node); #else static inline int compaction_register_node(struct node *node){	return 0;} static inline void compaction_unregister_node(struct node *node){}#endif /* CONFIG_COMPACTION && CONFIG_SYSFS && CONFIG_NUMA */ #endif /* _LINUX_COMPACTION_H */