1 #ifndef _LINUX_COMPACTION_H
2 #define _LINUX_COMPACTION_H
4 /* Return values for compact_zone() and try_to_compact_pages() */
5 /* When adding new states, please adjust include/trace/events/compaction.h */
7 /* For more detailed tracepoint output - internal to compaction */
8 COMPACT_NOT_SUITABLE_ZONE,
10 * compaction didn't start as it was not possible or direct reclaim
14 /* compaction didn't start as it was deferred due to past failures */
17 /* compaction not active last round */
18 COMPACT_INACTIVE = COMPACT_DEFERRED,
20 /* For more detailed tracepoint output - internal to compaction */
21 COMPACT_NO_SUITABLE_PAGE,
22 /* compaction should continue to another pageblock */
26 * The full zone was compacted scanned but wasn't successfull to compact
31 * direct compaction has scanned part of the zone but wasn't successfull
32 * to compact suitable pages.
34 COMPACT_PARTIAL_SKIPPED,
36 /* compaction terminated prematurely due to lock contentions */
40 * direct compaction partially compacted a zone and there might be
46 /* Used to signal whether compaction detected need_sched() or lock contention */
47 /* No contention detected */
48 #define COMPACT_CONTENDED_NONE 0
49 /* Either need_sched() was true or fatal signal pending */
50 #define COMPACT_CONTENDED_SCHED 1
51 /* Zone lock or lru_lock was contended in async compaction */
52 #define COMPACT_CONTENDED_LOCK 2
54 struct alloc_context; /* in mm/internal.h */
56 #ifdef CONFIG_COMPACTION
57 extern int sysctl_compact_memory;
58 extern int sysctl_compaction_handler(struct ctl_table *table, int write,
59 void __user *buffer, size_t *length, loff_t *ppos);
60 extern int sysctl_extfrag_threshold;
61 extern int sysctl_extfrag_handler(struct ctl_table *table, int write,
62 void __user *buffer, size_t *length, loff_t *ppos);
63 extern int sysctl_compact_unevictable_allowed;
65 extern int fragmentation_index(struct zone *zone, unsigned int order);
66 extern enum compact_result try_to_compact_pages(gfp_t gfp_mask,
68 unsigned int alloc_flags, const struct alloc_context *ac,
69 enum migrate_mode mode, int *contended);
70 extern void compact_pgdat(pg_data_t *pgdat, int order);
71 extern void reset_isolation_suitable(pg_data_t *pgdat);
72 extern enum compact_result compaction_suitable(struct zone *zone, int order,
73 unsigned int alloc_flags, int classzone_idx);
75 extern void defer_compaction(struct zone *zone, int order);
76 extern bool compaction_deferred(struct zone *zone, int order);
77 extern void compaction_defer_reset(struct zone *zone, int order,
79 extern bool compaction_restarting(struct zone *zone, int order);
81 extern int kcompactd_run(int nid);
82 extern void kcompactd_stop(int nid);
83 extern void wakeup_kcompactd(pg_data_t *pgdat, int order, int classzone_idx);
86 static inline enum compact_result try_to_compact_pages(gfp_t gfp_mask,
87 unsigned int order, int alloc_flags,
88 const struct alloc_context *ac,
89 enum migrate_mode mode, int *contended)
91 return COMPACT_CONTINUE;
94 static inline void compact_pgdat(pg_data_t *pgdat, int order)
98 static inline void reset_isolation_suitable(pg_data_t *pgdat)
102 static inline enum compact_result compaction_suitable(struct zone *zone, int order,
103 int alloc_flags, int classzone_idx)
105 return COMPACT_SKIPPED;
108 static inline void defer_compaction(struct zone *zone, int order)
112 static inline bool compaction_deferred(struct zone *zone, int order)
117 static inline int kcompactd_run(int nid)
121 static inline void kcompactd_stop(int nid)
125 static inline void wakeup_kcompactd(pg_data_t *pgdat, int order, int classzone_idx)
129 #endif /* CONFIG_COMPACTION */
131 #if defined(CONFIG_COMPACTION) && defined(CONFIG_SYSFS) && defined(CONFIG_NUMA)
132 extern int compaction_register_node(struct node *node);
133 extern void compaction_unregister_node(struct node *node);
137 static inline int compaction_register_node(struct node *node)
142 static inline void compaction_unregister_node(struct node *node)
145 #endif /* CONFIG_COMPACTION && CONFIG_SYSFS && CONFIG_NUMA */
147 #endif /* _LINUX_COMPACTION_H */