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include/linux/compaction.h
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#ifndef _LINUX_COMPACTION_H #define _LINUX_COMPACTION_H |
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/* Return values for compact_zone() and try_to_compact_pages() */ /* compaction didn't start as it was not possible or direct reclaim was more suitable */ #define COMPACT_SKIPPED 0 /* compaction should continue to another pageblock */ #define COMPACT_CONTINUE 1 /* direct compaction partially compacted a zone and there are suitable pages */ #define COMPACT_PARTIAL 2 /* The full zone was compacted */ #define COMPACT_COMPLETE 3 |
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#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); |
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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); |
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extern int fragmentation_index(struct zone *zone, unsigned int order); extern unsigned long try_to_compact_pages(struct zonelist *zonelist, int order, gfp_t gfp_mask, nodemask_t *mask); |
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/* Do not skip compaction more than 64 times */ #define COMPACT_MAX_DEFER_SHIFT 6 /* * Compaction is deferred when compaction fails to result in a page * allocation success. 1 << compact_defer_limit compactions are skipped up * to a limit of 1 << COMPACT_MAX_DEFER_SHIFT */ static inline void defer_compaction(struct zone *zone) { zone->compact_considered = 0; zone->compact_defer_shift++; if (zone->compact_defer_shift > COMPACT_MAX_DEFER_SHIFT) zone->compact_defer_shift = COMPACT_MAX_DEFER_SHIFT; } /* Returns true if compaction should be skipped this time */ static inline bool compaction_deferred(struct zone *zone) { unsigned long defer_limit = 1UL << zone->compact_defer_shift; /* Avoid possible overflow */ if (++zone->compact_considered > defer_limit) zone->compact_considered = defer_limit; return zone->compact_considered < (1UL << zone->compact_defer_shift); } |
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#else static inline unsigned long try_to_compact_pages(struct zonelist *zonelist, int order, gfp_t gfp_mask, nodemask_t *nodemask) { return COMPACT_CONTINUE; } |
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static inline void defer_compaction(struct zone *zone) { } static inline bool compaction_deferred(struct zone *zone) { return 1; } |
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#endif /* CONFIG_COMPACTION */ |
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#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 */ |
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#endif /* _LINUX_COMPACTION_H */ |