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 #define COMPACT_CONTENDED 7 19 /* When adding new states, please adjust include/trace/events/compaction.h */ 20 21 /* Used to signal whether compaction detected need_sched() or lock contention */ 22 /* No contention detected */ 23 #define COMPACT_CONTENDED_NONE 0 24 /* Either need_sched() was true or fatal signal pending */ 25 #define COMPACT_CONTENDED_SCHED 1 26 /* Zone lock or lru_lock was contended in async compaction */ 27 #define COMPACT_CONTENDED_LOCK 2 28 29 struct alloc_context; /* in mm/internal.h */ 30 31 #ifdef CONFIG_COMPACTION 32 extern int sysctl_compact_memory; 33 extern int sysctl_compaction_handler(struct ctl_table *table, int write, 34 void __user *buffer, size_t *length, loff_t *ppos); 35 extern int sysctl_extfrag_threshold; 36 extern int sysctl_extfrag_handler(struct ctl_table *table, int write, 37 void __user *buffer, size_t *length, loff_t *ppos); 38 extern int sysctl_compact_unevictable_allowed; 39 40 extern int fragmentation_index(struct zone *zone, unsigned int order); 41 extern unsigned long try_to_compact_pages(gfp_t gfp_mask, unsigned int order, 42 int alloc_flags, const struct alloc_context *ac, 43 enum migrate_mode mode, int *contended); 44 extern void compact_pgdat(pg_data_t *pgdat, int order); 45 extern void reset_isolation_suitable(pg_data_t *pgdat); 46 extern unsigned long compaction_suitable(struct zone *zone, int order, 47 int alloc_flags, int classzone_idx); 48 49 extern void defer_compaction(struct zone *zone, int order); 50 extern bool compaction_deferred(struct zone *zone, int order); 51 extern void compaction_defer_reset(struct zone *zone, int order, 52 bool alloc_success); 53 extern bool compaction_restarting(struct zone *zone, int order); 54 55 extern int kcompactd_run(int nid); 56 extern void kcompactd_stop(int nid); 57 extern void wakeup_kcompactd(pg_data_t *pgdat, int order, int classzone_idx); 58 59 #else 60 static inline unsigned long try_to_compact_pages(gfp_t gfp_mask, 61 unsigned int order, int alloc_flags, 62 const struct alloc_context *ac, 63 enum migrate_mode mode, int *contended) 64 { 65 return COMPACT_CONTINUE; 66 } 67 68 static inline void compact_pgdat(pg_data_t *pgdat, int order) 69 { 70 } 71 72 static inline void reset_isolation_suitable(pg_data_t *pgdat) 73 { 74 } 75 76 static inline unsigned long compaction_suitable(struct zone *zone, int order, 77 int alloc_flags, int classzone_idx) 78 { 79 return COMPACT_SKIPPED; 80 } 81 82 static inline void defer_compaction(struct zone *zone, int order) 83 { 84 } 85 86 static inline bool compaction_deferred(struct zone *zone, int order) 87 { 88 return true; 89 } 90 91 static inline int kcompactd_run(int nid) 92 { 93 return 0; 94 } 95 static inline void kcompactd_stop(int nid) 96 { 97 } 98 99 static inline void wakeup_kcompactd(pg_data_t *pgdat, int order, int classzone_idx) 100 { 101 } 102 103 #endif /* CONFIG_COMPACTION */ 104 105 #if defined(CONFIG_COMPACTION) && defined(CONFIG_SYSFS) && defined(CONFIG_NUMA) 106 extern int compaction_register_node(struct node *node); 107 extern void compaction_unregister_node(struct node *node); 108 109 #else 110 111 static inline int compaction_register_node(struct node *node) 112 { 113 return 0; 114 } 115 116 static inline void compaction_unregister_node(struct node *node) 117 { 118 } 119 #endif /* CONFIG_COMPACTION && CONFIG_SYSFS && CONFIG_NUMA */ 120 121 #endif /* _LINUX_COMPACTION_H */ 122