Linux kernel mirror (for testing)
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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 deferred due to past failures */
6#define COMPACT_DEFERRED 0
7/* compaction didn't start as it was not possible or direct reclaim was more suitable */
8#define COMPACT_SKIPPED 1
9/* compaction should continue to another pageblock */
10#define COMPACT_CONTINUE 2
11/* direct compaction partially compacted a zone and there are suitable pages */
12#define COMPACT_PARTIAL 3
13/* The full zone was compacted */
14#define COMPACT_COMPLETE 4
15/* For more detailed tracepoint output */
16#define COMPACT_NO_SUITABLE_PAGE 5
17#define COMPACT_NOT_SUITABLE_ZONE 6
18#define COMPACT_CONTENDED 7
19/* When adding new states, please adjust include/trace/events/compaction.h */
20
21/* Used to signal whether compaction detected need_sched() or lock contention */
22/* No contention detected */
23#define COMPACT_CONTENDED_NONE 0
24/* Either need_sched() was true or fatal signal pending */
25#define COMPACT_CONTENDED_SCHED 1
26/* Zone lock or lru_lock was contended in async compaction */
27#define COMPACT_CONTENDED_LOCK 2
28
29struct alloc_context; /* in mm/internal.h */
30
31#ifdef CONFIG_COMPACTION
32extern int sysctl_compact_memory;
33extern int sysctl_compaction_handler(struct ctl_table *table, int write,
34 void __user *buffer, size_t *length, loff_t *ppos);
35extern int sysctl_extfrag_threshold;
36extern int sysctl_extfrag_handler(struct ctl_table *table, int write,
37 void __user *buffer, size_t *length, loff_t *ppos);
38extern int sysctl_compact_unevictable_allowed;
39
40extern int fragmentation_index(struct zone *zone, unsigned int order);
41extern unsigned long try_to_compact_pages(gfp_t gfp_mask, unsigned int order,
42 int alloc_flags, const struct alloc_context *ac,
43 enum migrate_mode mode, int *contended);
44extern void compact_pgdat(pg_data_t *pgdat, int order);
45extern void reset_isolation_suitable(pg_data_t *pgdat);
46extern unsigned long compaction_suitable(struct zone *zone, int order,
47 int alloc_flags, int classzone_idx);
48
49extern void defer_compaction(struct zone *zone, int order);
50extern bool compaction_deferred(struct zone *zone, int order);
51extern void compaction_defer_reset(struct zone *zone, int order,
52 bool alloc_success);
53extern bool compaction_restarting(struct zone *zone, int order);
54
55extern int kcompactd_run(int nid);
56extern void kcompactd_stop(int nid);
57extern void wakeup_kcompactd(pg_data_t *pgdat, int order, int classzone_idx);
58
59#else
60static inline unsigned long try_to_compact_pages(gfp_t gfp_mask,
61 unsigned int order, int alloc_flags,
62 const struct alloc_context *ac,
63 enum migrate_mode mode, int *contended)
64{
65 return COMPACT_CONTINUE;
66}
67
68static inline void compact_pgdat(pg_data_t *pgdat, int order)
69{
70}
71
72static inline void reset_isolation_suitable(pg_data_t *pgdat)
73{
74}
75
76static inline unsigned long compaction_suitable(struct zone *zone, int order,
77 int alloc_flags, int classzone_idx)
78{
79 return COMPACT_SKIPPED;
80}
81
82static inline void defer_compaction(struct zone *zone, int order)
83{
84}
85
86static inline bool compaction_deferred(struct zone *zone, int order)
87{
88 return true;
89}
90
91static inline int kcompactd_run(int nid)
92{
93 return 0;
94}
95static inline void kcompactd_stop(int nid)
96{
97}
98
99static inline void wakeup_kcompactd(pg_data_t *pgdat, int order, int classzone_idx)
100{
101}
102
103#endif /* CONFIG_COMPACTION */
104
105#if defined(CONFIG_COMPACTION) && defined(CONFIG_SYSFS) && defined(CONFIG_NUMA)
106extern int compaction_register_node(struct node *node);
107extern void compaction_unregister_node(struct node *node);
108
109#else
110
111static inline int compaction_register_node(struct node *node)
112{
113 return 0;
114}
115
116static inline void compaction_unregister_node(struct node *node)
117{
118}
119#endif /* CONFIG_COMPACTION && CONFIG_SYSFS && CONFIG_NUMA */
120
121#endif /* _LINUX_COMPACTION_H */