1 #ifndef _LINUX_COMPACTION_H
2 #define _LINUX_COMPACTION_H
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 /* When adding new state, please change compaction_status_string, too */
20 /* Used to signal whether compaction detected need_sched() or lock contention */
21 /* No contention detected */
22 #define COMPACT_CONTENDED_NONE 0
23 /* Either need_sched() was true or fatal signal pending */
24 #define COMPACT_CONTENDED_SCHED 1
25 /* Zone lock or lru_lock was contended in async compaction */
26 #define COMPACT_CONTENDED_LOCK 2
28 struct alloc_context
; /* in mm/internal.h */
30 #ifdef CONFIG_COMPACTION
31 extern int sysctl_compact_memory
;
32 extern int sysctl_compaction_handler(struct ctl_table
*table
, int write
,
33 void __user
*buffer
, size_t *length
, loff_t
*ppos
);
34 extern int sysctl_extfrag_threshold
;
35 extern int sysctl_extfrag_handler(struct ctl_table
*table
, int write
,
36 void __user
*buffer
, size_t *length
, loff_t
*ppos
);
37 extern int sysctl_compact_unevictable_allowed
;
39 extern int fragmentation_index(struct zone
*zone
, unsigned int order
);
40 extern unsigned long try_to_compact_pages(gfp_t gfp_mask
, unsigned int order
,
41 int alloc_flags
, const struct alloc_context
*ac
,
42 enum migrate_mode mode
, int *contended
);
43 extern void compact_pgdat(pg_data_t
*pgdat
, int order
);
44 extern void reset_isolation_suitable(pg_data_t
*pgdat
);
45 extern unsigned long compaction_suitable(struct zone
*zone
, int order
,
46 int alloc_flags
, int classzone_idx
);
48 extern void defer_compaction(struct zone
*zone
, int order
);
49 extern bool compaction_deferred(struct zone
*zone
, int order
);
50 extern void compaction_defer_reset(struct zone
*zone
, int order
,
52 extern bool compaction_restarting(struct zone
*zone
, int order
);
55 static inline unsigned long try_to_compact_pages(gfp_t gfp_mask
,
56 unsigned int order
, int alloc_flags
,
57 const struct alloc_context
*ac
,
58 enum migrate_mode mode
, int *contended
)
60 return COMPACT_CONTINUE
;
63 static inline void compact_pgdat(pg_data_t
*pgdat
, int order
)
67 static inline void reset_isolation_suitable(pg_data_t
*pgdat
)
71 static inline unsigned long compaction_suitable(struct zone
*zone
, int order
,
72 int alloc_flags
, int classzone_idx
)
74 return COMPACT_SKIPPED
;
77 static inline void defer_compaction(struct zone
*zone
, int order
)
81 static inline bool compaction_deferred(struct zone
*zone
, int order
)
86 #endif /* CONFIG_COMPACTION */
88 #if defined(CONFIG_COMPACTION) && defined(CONFIG_SYSFS) && defined(CONFIG_NUMA)
89 extern int compaction_register_node(struct node
*node
);
90 extern void compaction_unregister_node(struct node
*node
);
94 static inline int compaction_register_node(struct node
*node
)
99 static inline void compaction_unregister_node(struct node
*node
)
102 #endif /* CONFIG_COMPACTION && CONFIG_SYSFS && CONFIG_NUMA */
104 #endif /* _LINUX_COMPACTION_H */