projects / mirror_ubuntu-zesty-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 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); | |
| 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 */ |