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1 | #ifndef _LINUX_COMPACTION_H |
2 | #define _LINUX_COMPACTION_H |
3 | |
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 |
13 | |
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); |
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); |
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, |
25 | bool sync, bool *contended); |
26 | extern void compact_pgdat(pg_data_t *pgdat, int order); |
27 | extern void reset_isolation_suitable(pg_data_t *pgdat); |
28 | extern unsigned long compaction_suitable(struct zone *zone, int order); |
29 | |
30 | /* Do not skip compaction more than 64 times */ |
31 | #define COMPACT_MAX_DEFER_SHIFT 6 |
32 | |
33 | /* |
34 | * Compaction is deferred when compaction fails to result in a page |
35 | * allocation success. 1 << compact_defer_limit compactions are skipped up |
36 | * to a limit of 1 << COMPACT_MAX_DEFER_SHIFT |
37 | */ |
38 | static inline void defer_compaction(struct zone *zone, int order) |
39 | { |
40 | zone->compact_considered = 0; |
41 | zone->compact_defer_shift++; |
42 | |
43 | if (order < zone->compact_order_failed) |
44 | zone->compact_order_failed = order; |
45 | |
46 | if (zone->compact_defer_shift > COMPACT_MAX_DEFER_SHIFT) |
47 | zone->compact_defer_shift = COMPACT_MAX_DEFER_SHIFT; |
48 | } |
49 | |
50 | /* Returns true if compaction should be skipped this time */ |
51 | static inline bool compaction_deferred(struct zone *zone, int order) |
52 | { |
53 | unsigned long defer_limit = 1UL << zone->compact_defer_shift; |
54 | |
55 | if (order < zone->compact_order_failed) |
56 | return false; |
57 | |
58 | /* Avoid possible overflow */ |
59 | if (++zone->compact_considered > defer_limit) |
60 | zone->compact_considered = defer_limit; |
61 | |
62 | return zone->compact_considered < defer_limit; |
63 | } |
64 | |
65 | /* Returns true if restarting compaction after many failures */ |
66 | static inline bool compaction_restarting(struct zone *zone, int order) |
67 | { |
68 | if (order < zone->compact_order_failed) |
69 | return false; |
70 | |
71 | return zone->compact_defer_shift == COMPACT_MAX_DEFER_SHIFT && |
72 | zone->compact_considered >= 1UL << zone->compact_defer_shift; |
73 | } |
74 | |
75 | #else |
76 | static inline unsigned long try_to_compact_pages(struct zonelist *zonelist, |
77 | int order, gfp_t gfp_mask, nodemask_t *nodemask, |
78 | bool sync, bool *contended) |
79 | { |
80 | return COMPACT_CONTINUE; |
81 | } |
82 | |
83 | static inline void compact_pgdat(pg_data_t *pgdat, int order) |
84 | { |
85 | } |
86 | |
87 | static inline void reset_isolation_suitable(pg_data_t *pgdat) |
88 | { |
89 | } |
90 | |
91 | static inline unsigned long compaction_suitable(struct zone *zone, int order) |
92 | { |
93 | return COMPACT_SKIPPED; |
94 | } |
95 | |
96 | static inline void defer_compaction(struct zone *zone, int order) |
97 | { |
98 | } |
99 | |
100 | static inline bool compaction_deferred(struct zone *zone, int order) |
101 | { |
102 | return true; |
103 | } |
104 | |
105 | #endif /* CONFIG_COMPACTION */ |
106 | |
107 | #if defined(CONFIG_COMPACTION) && defined(CONFIG_SYSFS) && defined(CONFIG_NUMA) |
108 | extern int compaction_register_node(struct node *node); |
109 | extern void compaction_unregister_node(struct node *node); |
110 | |
111 | #else |
112 | |
113 | static inline int compaction_register_node(struct node *node) |
114 | { |
115 | return 0; |
116 | } |
117 | |
118 | static inline void compaction_unregister_node(struct node *node) |
119 | { |
120 | } |
121 | #endif /* CONFIG_COMPACTION && CONFIG_SYSFS && CONFIG_NUMA */ |
122 | |
123 | #endif /* _LINUX_COMPACTION_H */ |
124 |
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