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 extern int sysctl_compact_unevictable_allowed; 38 39 extern int fragmentation_index(struct zone *zone, unsigned int order); 40 extern unsigned long try_to_compact_pages(gfp_t gfp_mask, unsigned int order, 41 int alloc_flags, const struct alloc_context *ac, 42 enum migrate_mode mode, int *contended); 43 extern void compact_pgdat(pg_data_t *pgdat, int order); 44 extern void reset_isolation_suitable(pg_data_t *pgdat); 45 extern unsigned long compaction_suitable(struct zone *zone, int order, 46 int alloc_flags, int classzone_idx); 47 48 extern void defer_compaction(struct zone *zone, int order); 49 extern bool compaction_deferred(struct zone *zone, int order); 50 extern void compaction_defer_reset(struct zone *zone, int order, 51 bool alloc_success); 52 extern bool compaction_restarting(struct zone *zone, int order); 53 54 #else 55 static inline unsigned long try_to_compact_pages(gfp_t gfp_mask, 56 unsigned int order, int alloc_flags, 57 const struct alloc_context *ac, 58 enum migrate_mode mode, int *contended) 59 { 60 return COMPACT_CONTINUE; 61 } 62 63 static inline void compact_pgdat(pg_data_t *pgdat, int order) 64 { 65 } 66 67 static inline void reset_isolation_suitable(pg_data_t *pgdat) 68 { 69 } 70 71 static inline unsigned long compaction_suitable(struct zone *zone, int order, 72 int alloc_flags, int classzone_idx) 73 { 74 return COMPACT_SKIPPED; 75 } 76 77 static inline void defer_compaction(struct zone *zone, int order) 78 { 79 } 80 81 static inline bool compaction_deferred(struct zone *zone, int order) 82 { 83 return true; 84 } 85 86 #endif /* CONFIG_COMPACTION */ 87 88 #if defined(CONFIG_COMPACTION) && defined(CONFIG_SYSFS) && defined(CONFIG_NUMA) 89 extern int compaction_register_node(struct node *node); 90 extern void compaction_unregister_node(struct node *node); 91 92 #else 93 94 static inline int compaction_register_node(struct node *node) 95 { 96 return 0; 97 } 98 99 static inline void compaction_unregister_node(struct node *node) 100 { 101 } 102 #endif /* CONFIG_COMPACTION && CONFIG_SYSFS && CONFIG_NUMA */ 103 104 #endif /* _LINUX_COMPACTION_H */ 105