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Commit | Line | Data |
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748446bb MG |
1 | #ifndef _LINUX_COMPACTION_H |
2 | #define _LINUX_COMPACTION_H | |
3 | ||
56de7263 | 4 | /* Return values for compact_zone() and try_to_compact_pages() */ |
53853e2d VB |
5 | /* compaction didn't start as it was deferred due to past failures */ |
6 | #define COMPACT_DEFERRED 0 | |
56de7263 | 7 | /* compaction didn't start as it was not possible or direct reclaim was more suitable */ |
53853e2d | 8 | #define COMPACT_SKIPPED 1 |
56de7263 | 9 | /* compaction should continue to another pageblock */ |
53853e2d | 10 | #define COMPACT_CONTINUE 2 |
56de7263 | 11 | /* direct compaction partially compacted a zone and there are suitable pages */ |
53853e2d | 12 | #define COMPACT_PARTIAL 3 |
56de7263 | 13 | /* The full zone was compacted */ |
53853e2d | 14 | #define COMPACT_COMPLETE 4 |
837d026d JK |
15 | /* For more detailed tracepoint output */ |
16 | #define COMPACT_NO_SUITABLE_PAGE 5 | |
17 | #define COMPACT_NOT_SUITABLE_ZONE 6 | |
16c4a097 | 18 | /* When adding new state, please change compaction_status_string, too */ |
748446bb | 19 | |
1f9efdef VB |
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 | ||
1a6d53a1 VB |
28 | struct alloc_context; /* in mm/internal.h */ |
29 | ||
76ab0f53 MG |
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); | |
5e771905 MG |
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); | |
5bbe3547 | 37 | extern int sysctl_compact_unevictable_allowed; |
56de7263 MG |
38 | |
39 | extern int fragmentation_index(struct zone *zone, unsigned int order); | |
1a6d53a1 VB |
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); | |
7103f16d | 43 | extern void compact_pgdat(pg_data_t *pgdat, int order); |
62997027 | 44 | extern void reset_isolation_suitable(pg_data_t *pgdat); |
ebff3980 VB |
45 | extern unsigned long compaction_suitable(struct zone *zone, int order, |
46 | int alloc_flags, int classzone_idx); | |
4f92e258 | 47 | |
24e2716f JK |
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); | |
62997027 | 53 | |
56de7263 | 54 | #else |
1a6d53a1 VB |
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) | |
56de7263 MG |
59 | { |
60 | return COMPACT_CONTINUE; | |
61 | } | |
62 | ||
7103f16d | 63 | static inline void compact_pgdat(pg_data_t *pgdat, int order) |
7be62de9 | 64 | { |
7be62de9 RR |
65 | } |
66 | ||
62997027 MG |
67 | static inline void reset_isolation_suitable(pg_data_t *pgdat) |
68 | { | |
69 | } | |
70 | ||
ebff3980 VB |
71 | static inline unsigned long compaction_suitable(struct zone *zone, int order, |
72 | int alloc_flags, int classzone_idx) | |
3e7d3449 MG |
73 | { |
74 | return COMPACT_SKIPPED; | |
75 | } | |
76 | ||
aff62249 | 77 | static inline void defer_compaction(struct zone *zone, int order) |
4f92e258 MG |
78 | { |
79 | } | |
80 | ||
aff62249 | 81 | static inline bool compaction_deferred(struct zone *zone, int order) |
4f92e258 | 82 | { |
c59e2610 | 83 | return true; |
4f92e258 MG |
84 | } |
85 | ||
76ab0f53 MG |
86 | #endif /* CONFIG_COMPACTION */ |
87 | ||
ed4a6d7f MG |
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 | ||
748446bb | 104 | #endif /* _LINUX_COMPACTION_H */ |