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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 | |
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14 | #define COMPACT_MODE_DIRECT_RECLAIM 0 |
15 | #define COMPACT_MODE_KSWAPD 1 | |
16 | ||
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17 | #ifdef CONFIG_COMPACTION |
18 | extern int sysctl_compact_memory; | |
19 | extern int sysctl_compaction_handler(struct ctl_table *table, int write, | |
20 | void __user *buffer, size_t *length, loff_t *ppos); | |
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21 | extern int sysctl_extfrag_threshold; |
22 | extern int sysctl_extfrag_handler(struct ctl_table *table, int write, | |
23 | void __user *buffer, size_t *length, loff_t *ppos); | |
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24 | |
25 | extern int fragmentation_index(struct zone *zone, unsigned int order); | |
26 | extern unsigned long try_to_compact_pages(struct zonelist *zonelist, | |
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27 | int order, gfp_t gfp_mask, nodemask_t *mask, |
28 | bool sync); | |
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29 | extern unsigned long compaction_suitable(struct zone *zone, int order); |
30 | extern unsigned long compact_zone_order(struct zone *zone, int order, | |
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31 | gfp_t gfp_mask, bool sync, |
32 | int compact_mode); | |
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33 | |
34 | /* Do not skip compaction more than 64 times */ | |
35 | #define COMPACT_MAX_DEFER_SHIFT 6 | |
36 | ||
37 | /* | |
38 | * Compaction is deferred when compaction fails to result in a page | |
39 | * allocation success. 1 << compact_defer_limit compactions are skipped up | |
40 | * to a limit of 1 << COMPACT_MAX_DEFER_SHIFT | |
41 | */ | |
42 | static inline void defer_compaction(struct zone *zone) | |
43 | { | |
44 | zone->compact_considered = 0; | |
45 | zone->compact_defer_shift++; | |
46 | ||
47 | if (zone->compact_defer_shift > COMPACT_MAX_DEFER_SHIFT) | |
48 | zone->compact_defer_shift = COMPACT_MAX_DEFER_SHIFT; | |
49 | } | |
50 | ||
51 | /* Returns true if compaction should be skipped this time */ | |
52 | static inline bool compaction_deferred(struct zone *zone) | |
53 | { | |
54 | unsigned long defer_limit = 1UL << zone->compact_defer_shift; | |
55 | ||
56 | /* Avoid possible overflow */ | |
57 | if (++zone->compact_considered > defer_limit) | |
58 | zone->compact_considered = defer_limit; | |
59 | ||
60 | return zone->compact_considered < (1UL << zone->compact_defer_shift); | |
61 | } | |
62 | ||
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63 | #else |
64 | static inline unsigned long try_to_compact_pages(struct zonelist *zonelist, | |
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65 | int order, gfp_t gfp_mask, nodemask_t *nodemask, |
66 | bool sync) | |
56de7263 MG |
67 | { |
68 | return COMPACT_CONTINUE; | |
69 | } | |
70 | ||
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71 | static inline unsigned long compaction_suitable(struct zone *zone, int order) |
72 | { | |
73 | return COMPACT_SKIPPED; | |
74 | } | |
75 | ||
76 | static inline unsigned long compact_zone_order(struct zone *zone, int order, | |
5a03b051 AA |
77 | gfp_t gfp_mask, bool sync, |
78 | int compact_mode) | |
3e7d3449 | 79 | { |
5a03b051 | 80 | return COMPACT_CONTINUE; |
3e7d3449 MG |
81 | } |
82 | ||
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83 | static inline void defer_compaction(struct zone *zone) |
84 | { | |
85 | } | |
86 | ||
87 | static inline bool compaction_deferred(struct zone *zone) | |
88 | { | |
89 | return 1; | |
90 | } | |
91 | ||
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92 | #endif /* CONFIG_COMPACTION */ |
93 | ||
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94 | #if defined(CONFIG_COMPACTION) && defined(CONFIG_SYSFS) && defined(CONFIG_NUMA) |
95 | extern int compaction_register_node(struct node *node); | |
96 | extern void compaction_unregister_node(struct node *node); | |
97 | ||
98 | #else | |
99 | ||
100 | static inline int compaction_register_node(struct node *node) | |
101 | { | |
102 | return 0; | |
103 | } | |
104 | ||
105 | static inline void compaction_unregister_node(struct node *node) | |
106 | { | |
107 | } | |
108 | #endif /* CONFIG_COMPACTION && CONFIG_SYSFS && CONFIG_NUMA */ | |
109 | ||
748446bb | 110 | #endif /* _LINUX_COMPACTION_H */ |