[GitHub/mt8127/android_kernel_alcatel_ttab.git] / include / linux / compaction.h

#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 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

#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 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,
			bool sync, bool *contended, struct page **page);
extern int 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);

/* 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, int order)
{
	zone->compact_considered = 0;
	zone->compact_defer_shift++;

	if (order < zone->compact_order_failed)
		zone->compact_order_failed = order;

	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, int order)
{
	unsigned long defer_limit = 1UL << zone->compact_defer_shift;

	if (order < zone->compact_order_failed)
		return false;

	/* Avoid possible overflow */
	if (++zone->compact_considered > defer_limit)
		zone->compact_considered = defer_limit;

	return zone->compact_considered < defer_limit;
}

/* Returns true if restarting compaction after many failures */
static inline bool compaction_restarting(struct zone *zone, int order)
{
	if (order < zone->compact_order_failed)
		return false;

	return zone->compact_defer_shift == COMPACT_MAX_DEFER_SHIFT &&
		zone->compact_considered >= 1UL << zone->compact_defer_shift;
}

#else
static inline unsigned long try_to_compact_pages(struct zonelist *zonelist,
			int order, gfp_t gfp_mask, nodemask_t *nodemask,
			bool sync, bool *contended, struct page **page)
{
	return COMPACT_CONTINUE;
}

static inline int compact_pgdat(pg_data_t *pgdat, int order)
{
	return COMPACT_CONTINUE;
}

static inline void reset_isolation_suitable(pg_data_t *pgdat)
{
}

static inline unsigned long compaction_suitable(struct zone *zone, int order)
{
	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 */
Commit	Line	Data
	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 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
	13
	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);
	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);
	21
	22	extern int fragmentation_index(struct zone *zone, unsigned int order);
	23	extern unsigned long try_to_compact_pages(struct zonelist *zonelist,
	24	int order, gfp_t gfp_mask, nodemask_t *mask,
	25	bool sync, bool contended, struct page *page);
	26	extern int compact_pgdat(pg_data_t *pgdat, int order);
	27	extern void reset_isolation_suitable(pg_data_t *pgdat);
	28	extern unsigned long compaction_suitable(struct zone *zone, int order);
	29
	30	/* Do not skip compaction more than 64 times */
	31	#define COMPACT_MAX_DEFER_SHIFT 6
	32
	33	/*
	34	* Compaction is deferred when compaction fails to result in a page
	35	* allocation success. 1 << compact_defer_limit compactions are skipped up
	36	* to a limit of 1 << COMPACT_MAX_DEFER_SHIFT
	37	*/
	38	static inline void defer_compaction(struct zone *zone, int order)
	39	{
	40	zone->compact_considered = 0;
	41	zone->compact_defer_shift++;
	42
	43	if (order < zone->compact_order_failed)
	44	zone->compact_order_failed = order;
	45
	46	if (zone->compact_defer_shift > COMPACT_MAX_DEFER_SHIFT)
	47	zone->compact_defer_shift = COMPACT_MAX_DEFER_SHIFT;
	48	}
	49
	50	/* Returns true if compaction should be skipped this time */
	51	static inline bool compaction_deferred(struct zone *zone, int order)
	52	{
	53	unsigned long defer_limit = 1UL << zone->compact_defer_shift;
	54
	55	if (order < zone->compact_order_failed)
	56	return false;
	57
	58	/* Avoid possible overflow */
	59	if (++zone->compact_considered > defer_limit)
	60	zone->compact_considered = defer_limit;
	61
	62	return zone->compact_considered < defer_limit;
	63	}
	64
	65	/* Returns true if restarting compaction after many failures */
	66	static inline bool compaction_restarting(struct zone *zone, int order)
	67	{
	68	if (order < zone->compact_order_failed)
	69	return false;
	70
	71	return zone->compact_defer_shift == COMPACT_MAX_DEFER_SHIFT &&
	72	zone->compact_considered >= 1UL << zone->compact_defer_shift;
	73	}
	74
	75	#else
	76	static inline unsigned long try_to_compact_pages(struct zonelist *zonelist,
	77	int order, gfp_t gfp_mask, nodemask_t *nodemask,
	78	bool sync, bool contended, struct page *page)
	79	{
	80	return COMPACT_CONTINUE;
	81	}
	82
	83	static inline int compact_pgdat(pg_data_t *pgdat, int order)
	84	{
	85	return COMPACT_CONTINUE;
	86	}
	87
	88	static inline void reset_isolation_suitable(pg_data_t *pgdat)
	89	{
	90	}
	91
	92	static inline unsigned long compaction_suitable(struct zone *zone, int order)
	93	{
	94	return COMPACT_SKIPPED;
	95	}
	96
	97	static inline void defer_compaction(struct zone *zone, int order)
	98	{
	99	}
	100
	101	static inline bool compaction_deferred(struct zone *zone, int order)
	102	{
	103	return true;
	104	}
	105
	106	#endif /* CONFIG_COMPACTION */
	107
	108	#if defined(CONFIG_COMPACTION) && defined(CONFIG_SYSFS) && defined(CONFIG_NUMA)
	109	extern int compaction_register_node(struct node *node);
	110	extern void compaction_unregister_node(struct node *node);
	111
	112	#else
	113
	114	static inline int compaction_register_node(struct node *node)
	115	{
	116	return 0;
	117	}
	118
	119	static inline void compaction_unregister_node(struct node *node)
	120	{
	121	}
	122	#endif /* CONFIG_COMPACTION && CONFIG_SYSFS && CONFIG_NUMA */
	123
	124	#endif /* _LINUX_COMPACTION_H */