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748446bb MG |
1 | #ifndef _LINUX_COMPACTION_H |
2 | #define _LINUX_COMPACTION_H | |
3 | ||
56de7263 MG |
4 | /* Return values for compact_zone() and try_to_compact_pages() */ |
5 | /* compaction didn't start as it was not possible or direct reclaim was more suitable */ | |
6 | #define COMPACT_SKIPPED 0 | |
7 | /* compaction should continue to another pageblock */ | |
8 | #define COMPACT_CONTINUE 1 | |
9 | /* direct compaction partially compacted a zone and there are suitable pages */ | |
10 | #define COMPACT_PARTIAL 2 | |
11 | /* The full zone was compacted */ | |
12 | #define COMPACT_COMPLETE 3 | |
748446bb | 13 | |
76ab0f53 MG |
14 | #ifdef CONFIG_COMPACTION |
15 | extern int sysctl_compact_memory; | |
16 | extern int sysctl_compaction_handler(struct ctl_table *table, int write, | |
17 | void __user *buffer, size_t *length, loff_t *ppos); | |
5e771905 MG |
18 | extern int sysctl_extfrag_threshold; |
19 | extern int sysctl_extfrag_handler(struct ctl_table *table, int write, | |
20 | void __user *buffer, size_t *length, loff_t *ppos); | |
56de7263 MG |
21 | |
22 | extern int fragmentation_index(struct zone *zone, unsigned int order); | |
23 | extern unsigned long try_to_compact_pages(struct zonelist *zonelist, | |
77f1fe6b MG |
24 | int order, gfp_t gfp_mask, nodemask_t *mask, |
25 | bool sync); | |
7be62de9 | 26 | extern int compact_pgdat(pg_data_t *pgdat, int order); |
3e7d3449 | 27 | extern unsigned long compaction_suitable(struct zone *zone, int order); |
4f92e258 MG |
28 | |
29 | /* Do not skip compaction more than 64 times */ | |
30 | #define COMPACT_MAX_DEFER_SHIFT 6 | |
31 | ||
32 | /* | |
33 | * Compaction is deferred when compaction fails to result in a page | |
34 | * allocation success. 1 << compact_defer_limit compactions are skipped up | |
35 | * to a limit of 1 << COMPACT_MAX_DEFER_SHIFT | |
36 | */ | |
aff62249 | 37 | static inline void defer_compaction(struct zone *zone, int order) |
4f92e258 MG |
38 | { |
39 | zone->compact_considered = 0; | |
40 | zone->compact_defer_shift++; | |
41 | ||
aff62249 RR |
42 | if (order < zone->compact_order_failed) |
43 | zone->compact_order_failed = order; | |
44 | ||
4f92e258 MG |
45 | if (zone->compact_defer_shift > COMPACT_MAX_DEFER_SHIFT) |
46 | zone->compact_defer_shift = COMPACT_MAX_DEFER_SHIFT; | |
47 | } | |
48 | ||
49 | /* Returns true if compaction should be skipped this time */ | |
aff62249 | 50 | static inline bool compaction_deferred(struct zone *zone, int order) |
4f92e258 MG |
51 | { |
52 | unsigned long defer_limit = 1UL << zone->compact_defer_shift; | |
53 | ||
aff62249 RR |
54 | if (order < zone->compact_order_failed) |
55 | return false; | |
56 | ||
4f92e258 MG |
57 | /* Avoid possible overflow */ |
58 | if (++zone->compact_considered > defer_limit) | |
59 | zone->compact_considered = defer_limit; | |
60 | ||
61 | return zone->compact_considered < (1UL << zone->compact_defer_shift); | |
62 | } | |
63 | ||
56de7263 MG |
64 | #else |
65 | static inline unsigned long try_to_compact_pages(struct zonelist *zonelist, | |
77f1fe6b MG |
66 | int order, gfp_t gfp_mask, nodemask_t *nodemask, |
67 | bool sync) | |
56de7263 MG |
68 | { |
69 | return COMPACT_CONTINUE; | |
70 | } | |
71 | ||
7be62de9 RR |
72 | static inline int compact_pgdat(pg_data_t *pgdat, int order) |
73 | { | |
74 | return COMPACT_CONTINUE; | |
75 | } | |
76 | ||
3e7d3449 MG |
77 | static inline unsigned long compaction_suitable(struct zone *zone, int order) |
78 | { | |
79 | return COMPACT_SKIPPED; | |
80 | } | |
81 | ||
aff62249 | 82 | static inline void defer_compaction(struct zone *zone, int order) |
4f92e258 MG |
83 | { |
84 | } | |
85 | ||
aff62249 | 86 | static inline bool compaction_deferred(struct zone *zone, int order) |
4f92e258 MG |
87 | { |
88 | return 1; | |
89 | } | |
90 | ||
76ab0f53 MG |
91 | #endif /* CONFIG_COMPACTION */ |
92 | ||
ed4a6d7f MG |
93 | #if defined(CONFIG_COMPACTION) && defined(CONFIG_SYSFS) && defined(CONFIG_NUMA) |
94 | extern int compaction_register_node(struct node *node); | |
95 | extern void compaction_unregister_node(struct node *node); | |
96 | ||
97 | #else | |
98 | ||
99 | static inline int compaction_register_node(struct node *node) | |
100 | { | |
101 | return 0; | |
102 | } | |
103 | ||
104 | static inline void compaction_unregister_node(struct node *node) | |
105 | { | |
106 | } | |
107 | #endif /* CONFIG_COMPACTION && CONFIG_SYSFS && CONFIG_NUMA */ | |
108 | ||
748446bb | 109 | #endif /* _LINUX_COMPACTION_H */ |