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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, | |
24 | int order, gfp_t gfp_mask, nodemask_t *mask); | |
3e7d3449 MG |
25 | extern unsigned long compaction_suitable(struct zone *zone, int order); |
26 | extern unsigned long compact_zone_order(struct zone *zone, int order, | |
27 | gfp_t gfp_mask); | |
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 | */ | |
37 | static inline void defer_compaction(struct zone *zone) | |
38 | { | |
39 | zone->compact_considered = 0; | |
40 | zone->compact_defer_shift++; | |
41 | ||
42 | if (zone->compact_defer_shift > COMPACT_MAX_DEFER_SHIFT) | |
43 | zone->compact_defer_shift = COMPACT_MAX_DEFER_SHIFT; | |
44 | } | |
45 | ||
46 | /* Returns true if compaction should be skipped this time */ | |
47 | static inline bool compaction_deferred(struct zone *zone) | |
48 | { | |
49 | unsigned long defer_limit = 1UL << zone->compact_defer_shift; | |
50 | ||
51 | /* Avoid possible overflow */ | |
52 | if (++zone->compact_considered > defer_limit) | |
53 | zone->compact_considered = defer_limit; | |
54 | ||
55 | return zone->compact_considered < (1UL << zone->compact_defer_shift); | |
56 | } | |
57 | ||
56de7263 MG |
58 | #else |
59 | static inline unsigned long try_to_compact_pages(struct zonelist *zonelist, | |
60 | int order, gfp_t gfp_mask, nodemask_t *nodemask) | |
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 | ||
70 | static inline unsigned long compact_zone_order(struct zone *zone, int order, | |
71 | gfp_t gfp_mask) | |
72 | { | |
73 | return 0; | |
74 | } | |
75 | ||
4f92e258 MG |
76 | static inline void defer_compaction(struct zone *zone) |
77 | { | |
78 | } | |
79 | ||
80 | static inline bool compaction_deferred(struct zone *zone) | |
81 | { | |
82 | return 1; | |
83 | } | |
84 | ||
76ab0f53 MG |
85 | #endif /* CONFIG_COMPACTION */ |
86 | ||
ed4a6d7f MG |
87 | #if defined(CONFIG_COMPACTION) && defined(CONFIG_SYSFS) && defined(CONFIG_NUMA) |
88 | extern int compaction_register_node(struct node *node); | |
89 | extern void compaction_unregister_node(struct node *node); | |
90 | ||
91 | #else | |
92 | ||
93 | static inline int compaction_register_node(struct node *node) | |
94 | { | |
95 | return 0; | |
96 | } | |
97 | ||
98 | static inline void compaction_unregister_node(struct node *node) | |
99 | { | |
100 | } | |
101 | #endif /* CONFIG_COMPACTION && CONFIG_SYSFS && CONFIG_NUMA */ | |
102 | ||
748446bb | 103 | #endif /* _LINUX_COMPACTION_H */ |