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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); | |
3e7d3449 | 26 | extern unsigned long compaction_suitable(struct zone *zone, int order); |
4f92e258 MG |
27 | |
28 | /* Do not skip compaction more than 64 times */ | |
29 | #define COMPACT_MAX_DEFER_SHIFT 6 | |
30 | ||
31 | /* | |
32 | * Compaction is deferred when compaction fails to result in a page | |
33 | * allocation success. 1 << compact_defer_limit compactions are skipped up | |
34 | * to a limit of 1 << COMPACT_MAX_DEFER_SHIFT | |
35 | */ | |
36 | static inline void defer_compaction(struct zone *zone) | |
37 | { | |
38 | zone->compact_considered = 0; | |
39 | zone->compact_defer_shift++; | |
40 | ||
41 | if (zone->compact_defer_shift > COMPACT_MAX_DEFER_SHIFT) | |
42 | zone->compact_defer_shift = COMPACT_MAX_DEFER_SHIFT; | |
43 | } | |
44 | ||
45 | /* Returns true if compaction should be skipped this time */ | |
46 | static inline bool compaction_deferred(struct zone *zone) | |
47 | { | |
48 | unsigned long defer_limit = 1UL << zone->compact_defer_shift; | |
49 | ||
50 | /* Avoid possible overflow */ | |
51 | if (++zone->compact_considered > defer_limit) | |
52 | zone->compact_considered = defer_limit; | |
53 | ||
54 | return zone->compact_considered < (1UL << zone->compact_defer_shift); | |
55 | } | |
56 | ||
56de7263 MG |
57 | #else |
58 | static inline unsigned long try_to_compact_pages(struct zonelist *zonelist, | |
77f1fe6b MG |
59 | int order, gfp_t gfp_mask, nodemask_t *nodemask, |
60 | bool sync) | |
56de7263 MG |
61 | { |
62 | return COMPACT_CONTINUE; | |
63 | } | |
64 | ||
3e7d3449 MG |
65 | static inline unsigned long compaction_suitable(struct zone *zone, int order) |
66 | { | |
67 | return COMPACT_SKIPPED; | |
68 | } | |
69 | ||
4f92e258 MG |
70 | static inline void defer_compaction(struct zone *zone) |
71 | { | |
72 | } | |
73 | ||
74 | static inline bool compaction_deferred(struct zone *zone) | |
75 | { | |
76 | return 1; | |
77 | } | |
78 | ||
76ab0f53 MG |
79 | #endif /* CONFIG_COMPACTION */ |
80 | ||
ed4a6d7f MG |
81 | #if defined(CONFIG_COMPACTION) && defined(CONFIG_SYSFS) && defined(CONFIG_NUMA) |
82 | extern int compaction_register_node(struct node *node); | |
83 | extern void compaction_unregister_node(struct node *node); | |
84 | ||
85 | #else | |
86 | ||
87 | static inline int compaction_register_node(struct node *node) | |
88 | { | |
89 | return 0; | |
90 | } | |
91 | ||
92 | static inline void compaction_unregister_node(struct node *node) | |
93 | { | |
94 | } | |
95 | #endif /* CONFIG_COMPACTION && CONFIG_SYSFS && CONFIG_NUMA */ | |
96 | ||
748446bb | 97 | #endif /* _LINUX_COMPACTION_H */ |