| 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 */ |