diff options
Diffstat (limited to 'kernel/include/linux/compaction.h')
| -rw-r--r-- | kernel/include/linux/compaction.h | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/kernel/include/linux/compaction.h b/kernel/include/linux/compaction.h new file mode 100644 index 000000000..aa8f61cf3 --- /dev/null +++ b/kernel/include/linux/compaction.h @@ -0,0 +1,104 @@ +#ifndef _LINUX_COMPACTION_H +#define _LINUX_COMPACTION_H + +/* Return values for compact_zone() and try_to_compact_pages() */ +/* compaction didn't start as it was deferred due to past failures */ +#define COMPACT_DEFERRED 0 +/* compaction didn't start as it was not possible or direct reclaim was more suitable */ +#define COMPACT_SKIPPED 1 +/* compaction should continue to another pageblock */ +#define COMPACT_CONTINUE 2 +/* direct compaction partially compacted a zone and there are suitable pages */ +#define COMPACT_PARTIAL 3 +/* The full zone was compacted */ +#define COMPACT_COMPLETE 4 +/* For more detailed tracepoint output */ +#define COMPACT_NO_SUITABLE_PAGE 5 +#define COMPACT_NOT_SUITABLE_ZONE 6 +/* When adding new state, please change compaction_status_string, too */ + +/* Used to signal whether compaction detected need_sched() or lock contention */ +/* No contention detected */ +#define COMPACT_CONTENDED_NONE 0 +/* Either need_sched() was true or fatal signal pending */ +#define COMPACT_CONTENDED_SCHED 1 +/* Zone lock or lru_lock was contended in async compaction */ +#define COMPACT_CONTENDED_LOCK 2 + +struct alloc_context; /* in mm/internal.h */ + +#ifdef CONFIG_COMPACTION +extern int sysctl_compact_memory; +extern int sysctl_compaction_handler(struct ctl_table *table, int write, + void __user *buffer, size_t *length, loff_t *ppos); +extern int sysctl_extfrag_threshold; +extern int sysctl_extfrag_handler(struct ctl_table *table, int write, + void __user *buffer, size_t *length, loff_t *ppos); +extern int sysctl_compact_unevictable_allowed; + +extern int fragmentation_index(struct zone *zone, unsigned int order); +extern unsigned long try_to_compact_pages(gfp_t gfp_mask, unsigned int order, + int alloc_flags, const struct alloc_context *ac, + enum migrate_mode mode, int *contended); +extern void compact_pgdat(pg_data_t *pgdat, int order); +extern void reset_isolation_suitable(pg_data_t *pgdat); +extern unsigned long compaction_suitable(struct zone *zone, int order, + int alloc_flags, int classzone_idx); + +extern void defer_compaction(struct zone *zone, int order); +extern bool compaction_deferred(struct zone *zone, int order); +extern void compaction_defer_reset(struct zone *zone, int order, + bool alloc_success); +extern bool compaction_restarting(struct zone *zone, int order); + +#else +static inline unsigned long try_to_compact_pages(gfp_t gfp_mask, + unsigned int order, int alloc_flags, + const struct alloc_context *ac, + enum migrate_mode mode, int *contended) +{ + return COMPACT_CONTINUE; +} + +static inline void compact_pgdat(pg_data_t *pgdat, int order) +{ +} + +static inline void reset_isolation_suitable(pg_data_t *pgdat) +{ +} + +static inline unsigned long compaction_suitable(struct zone *zone, int order, + int alloc_flags, int classzone_idx) +{ + return COMPACT_SKIPPED; +} + +static inline void defer_compaction(struct zone *zone, int order) +{ +} + +static inline bool compaction_deferred(struct zone *zone, int order) +{ + return true; +} + +#endif /* CONFIG_COMPACTION */ + +#if defined(CONFIG_COMPACTION) && defined(CONFIG_SYSFS) && defined(CONFIG_NUMA) +extern int compaction_register_node(struct node *node); +extern void compaction_unregister_node(struct node *node); + +#else + +static inline int compaction_register_node(struct node *node) +{ + return 0; +} + +static inline void compaction_unregister_node(struct node *node) +{ +} +#endif /* CONFIG_COMPACTION && CONFIG_SYSFS && CONFIG_NUMA */ + +#endif /* _LINUX_COMPACTION_H */ |