1 #ifndef _LINUX_COMPACTION_H 2 #define _LINUX_COMPACTION_H 3 4 /* Return values for compact_zone() and try_to_compact_pages() */ 5 /* compaction didn't start as it was deferred due to past failures */ 6 #define COMPACT_DEFERRED 0 7 /* compaction didn't start as it was not possible or direct reclaim was more suitable */ 8 #define COMPACT_SKIPPED 1 9 /* compaction should continue to another pageblock */ 10 #define COMPACT_CONTINUE 2 11 /* direct compaction partially compacted a zone and there are suitable pages */ 12 #define COMPACT_PARTIAL 3 13 /* The full zone was compacted */ 14 #define COMPACT_COMPLETE 4 15 /* For more detailed tracepoint output */ 16 #define COMPACT_NO_SUITABLE_PAGE 5 17 #define COMPACT_NOT_SUITABLE_ZONE 6 18 /* When adding new state, please change compaction_status_string, too */ 19 20 /* Used to signal whether compaction detected need_sched() or lock contention */ 21 /* No contention detected */ 22 #define COMPACT_CONTENDED_NONE 0 23 /* Either need_sched() was true or fatal signal pending */ 24 #define COMPACT_CONTENDED_SCHED 1 25 /* Zone lock or lru_lock was contended in async compaction */ 26 #define COMPACT_CONTENDED_LOCK 2 27 28 struct alloc_context; /* in mm/internal.h */ 29 30 #ifdef CONFIG_COMPACTION 31 extern int sysctl_compact_memory; 32 extern int sysctl_compaction_handler(struct ctl_table *table, int write, 33 void __user *buffer, size_t *length, loff_t *ppos); 34 extern int sysctl_extfrag_threshold; 35 extern int sysctl_extfrag_handler(struct ctl_table *table, int write, 36 void __user *buffer, size_t *length, loff_t *ppos); 37 38 extern int fragmentation_index(struct zone *zone, unsigned int order); 39 extern unsigned long try_to_compact_pages(gfp_t gfp_mask, unsigned int order, 40 int alloc_flags, const struct alloc_context *ac, 41 enum migrate_mode mode, int *contended); 42 extern void compact_pgdat(pg_data_t *pgdat, int order); 43 extern void reset_isolation_suitable(pg_data_t *pgdat); 44 extern unsigned long compaction_suitable(struct zone *zone, int order, 45 int alloc_flags, int classzone_idx); 46 47 extern void defer_compaction(struct zone *zone, int order); 48 extern bool compaction_deferred(struct zone *zone, int order); 49 extern void compaction_defer_reset(struct zone *zone, int order, 50 bool alloc_success); 51 extern bool compaction_restarting(struct zone *zone, int order); 52 53 #else 54 static inline unsigned long try_to_compact_pages(gfp_t gfp_mask, 55 unsigned int order, int alloc_flags, 56 const struct alloc_context *ac, 57 enum migrate_mode mode, int *contended) 58 { 59 return COMPACT_CONTINUE; 60 } 61 62 static inline void compact_pgdat(pg_data_t *pgdat, int order) 63 { 64 } 65 66 static inline void reset_isolation_suitable(pg_data_t *pgdat) 67 { 68 } 69 70 static inline unsigned long compaction_suitable(struct zone *zone, int order, 71 int alloc_flags, int classzone_idx) 72 { 73 return COMPACT_SKIPPED; 74 } 75 76 static inline void defer_compaction(struct zone *zone, int order) 77 { 78 } 79 80 static inline bool compaction_deferred(struct zone *zone, int order) 81 { 82 return true; 83 } 84 85 #endif /* CONFIG_COMPACTION */ 86 87 #if defined(CONFIG_COMPACTION) && defined(CONFIG_SYSFS) && defined(CONFIG_NUMA) 88 extern int compaction_register_node(struct node *node); 89 extern void compaction_unregister_node(struct node *node); 90 91 #else 92 93 static inline int compaction_register_node(struct node *node) 94 { 95 return 0; 96 } 97 98 static inline void compaction_unregister_node(struct node *node) 99 { 100 } 101 #endif /* CONFIG_COMPACTION && CONFIG_SYSFS && CONFIG_NUMA */ 102 103 #endif /* _LINUX_COMPACTION_H */ 104