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 #else
try_to_compact_pages(gfp_t gfp_mask,unsigned int order,int alloc_flags,const struct alloc_context * ac,enum migrate_mode mode,int * contended)56 static inline unsigned long try_to_compact_pages(gfp_t gfp_mask,
57 unsigned int order, int alloc_flags,
58 const struct alloc_context *ac,
59 enum migrate_mode mode, int *contended)
60 {
61 return COMPACT_CONTINUE;
62 }
63
compact_pgdat(pg_data_t * pgdat,int order)64 static inline void compact_pgdat(pg_data_t *pgdat, int order)
65 {
66 }
67
reset_isolation_suitable(pg_data_t * pgdat)68 static inline void reset_isolation_suitable(pg_data_t *pgdat)
69 {
70 }
71
compaction_suitable(struct zone * zone,int order,int alloc_flags,int classzone_idx)72 static inline unsigned long compaction_suitable(struct zone *zone, int order,
73 int alloc_flags, int classzone_idx)
74 {
75 return COMPACT_SKIPPED;
76 }
77
defer_compaction(struct zone * zone,int order)78 static inline void defer_compaction(struct zone *zone, int order)
79 {
80 }
81
compaction_deferred(struct zone * zone,int order)82 static inline bool compaction_deferred(struct zone *zone, int order)
83 {
84 return true;
85 }
86
87 #endif /* CONFIG_COMPACTION */
88
89 #if defined(CONFIG_COMPACTION) && defined(CONFIG_SYSFS) && defined(CONFIG_NUMA)
90 extern int compaction_register_node(struct node *node);
91 extern void compaction_unregister_node(struct node *node);
92
93 #else
94
compaction_register_node(struct node * node)95 static inline int compaction_register_node(struct node *node)
96 {
97 return 0;
98 }
99
compaction_unregister_node(struct node * node)100 static inline void compaction_unregister_node(struct node *node)
101 {
102 }
103 #endif /* CONFIG_COMPACTION && CONFIG_SYSFS && CONFIG_NUMA */
104
105 #endif /* _LINUX_COMPACTION_H */
106