[deliverable/linux.git] / include / linux / mm_inline.h

#ifndef LINUX_MM_INLINE_H
#define LINUX_MM_INLINE_H

#include <linux/huge_mm.h>
#include <linux/swap.h>

/**
 * page_is_file_cache - should the page be on a file LRU or anon LRU?
 * @page: the page to test
 *
 * Returns 1 if @page is page cache page backed by a regular filesystem,
 * or 0 if @page is anonymous, tmpfs or otherwise ram or swap backed.
 * Used by functions that manipulate the LRU lists, to sort a page
 * onto the right LRU list.
 *
 * We would like to get this info without a page flag, but the state
 * needs to survive until the page is last deleted from the LRU, which
 * could be as far down as __page_cache_release.
 */
static inline int page_is_file_cache(struct page *page)
{
	return !PageSwapBacked(page);
}

static __always_inline void add_page_to_lru_list(struct page *page,
				struct lruvec *lruvec, enum lru_list lru)
{
	int nr_pages = hpage_nr_pages(page);
	mem_cgroup_update_lru_size(lruvec, lru, nr_pages);
	list_add(&page->lru, &lruvec->lists[lru]);
	__mod_zone_page_state(lruvec_zone(lruvec), NR_LRU_BASE + lru, nr_pages);
}

static __always_inline void del_page_from_lru_list(struct page *page,
				struct lruvec *lruvec, enum lru_list lru)
{
	int nr_pages = hpage_nr_pages(page);
	mem_cgroup_update_lru_size(lruvec, lru, -nr_pages);
	list_del(&page->lru);
	__mod_zone_page_state(lruvec_zone(lruvec), NR_LRU_BASE + lru, -nr_pages);
}

/**
 * page_lru_base_type - which LRU list type should a page be on?
 * @page: the page to test
 *
 * Used for LRU list index arithmetic.
 *
 * Returns the base LRU type - file or anon - @page should be on.
 */
static inline enum lru_list page_lru_base_type(struct page *page)
{
	if (page_is_file_cache(page))
		return LRU_INACTIVE_FILE;
	return LRU_INACTIVE_ANON;
}

/**
 * page_off_lru - which LRU list was page on? clearing its lru flags.
 * @page: the page to test
 *
 * Returns the LRU list a page was on, as an index into the array of LRU
 * lists; and clears its Unevictable or Active flags, ready for freeing.
 */
static __always_inline enum lru_list page_off_lru(struct page *page)
{
	enum lru_list lru;

	if (PageUnevictable(page)) {
		__ClearPageUnevictable(page);
		lru = LRU_UNEVICTABLE;
	} else {
		lru = page_lru_base_type(page);
		if (PageActive(page)) {
			__ClearPageActive(page);
			lru += LRU_ACTIVE;
		}
	}
	return lru;
}

/**
 * page_lru - which LRU list should a page be on?
 * @page: the page to test
 *
 * Returns the LRU list a page should be on, as an index
 * into the array of LRU lists.
 */
static __always_inline enum lru_list page_lru(struct page *page)
{
	enum lru_list lru;

	if (PageUnevictable(page))
		lru = LRU_UNEVICTABLE;
	else {
		lru = page_lru_base_type(page);
		if (PageActive(page))
			lru += LRU_ACTIVE;
	}
	return lru;
}

#endif
Commit	Line	Data
	1	#ifndef LINUX_MM_INLINE_H
	2	#define LINUX_MM_INLINE_H
	3
	4	#include <linux/huge_mm.h>
	5	#include <linux/swap.h>
	6
	7	/**
	8	* page_is_file_cache - should the page be on a file LRU or anon LRU?
	9	* @page: the page to test
	10	*
	11	* Returns 1 if @page is page cache page backed by a regular filesystem,
	12	* or 0 if @page is anonymous, tmpfs or otherwise ram or swap backed.
	13	* Used by functions that manipulate the LRU lists, to sort a page
	14	* onto the right LRU list.
	15	*
	16	* We would like to get this info without a page flag, but the state
	17	* needs to survive until the page is last deleted from the LRU, which
	18	* could be as far down as __page_cache_release.
	19	*/
	20	static inline int page_is_file_cache(struct page *page)
	21	{
	22	return !PageSwapBacked(page);
	23	}
	24
	25	static __always_inline void add_page_to_lru_list(struct page *page,
	26	struct lruvec *lruvec, enum lru_list lru)
	27	{
	28	int nr_pages = hpage_nr_pages(page);
	29	mem_cgroup_update_lru_size(lruvec, lru, nr_pages);
	30	list_add(&page->lru, &lruvec->lists[lru]);
	31	__mod_zone_page_state(lruvec_zone(lruvec), NR_LRU_BASE + lru, nr_pages);
	32	}
	33
	34	static __always_inline void del_page_from_lru_list(struct page *page,
	35	struct lruvec *lruvec, enum lru_list lru)
	36	{
	37	int nr_pages = hpage_nr_pages(page);
	38	mem_cgroup_update_lru_size(lruvec, lru, -nr_pages);
	39	list_del(&page->lru);
	40	__mod_zone_page_state(lruvec_zone(lruvec), NR_LRU_BASE + lru, -nr_pages);
	41	}
	42
	43	/**
	44	* page_lru_base_type - which LRU list type should a page be on?
	45	* @page: the page to test
	46	*
	47	* Used for LRU list index arithmetic.
	48	*
	49	* Returns the base LRU type - file or anon - @page should be on.
	50	*/
	51	static inline enum lru_list page_lru_base_type(struct page *page)
	52	{
	53	if (page_is_file_cache(page))
	54	return LRU_INACTIVE_FILE;
	55	return LRU_INACTIVE_ANON;
	56	}
	57
	58	/**
	59	* page_off_lru - which LRU list was page on? clearing its lru flags.
	60	* @page: the page to test
	61	*
	62	* Returns the LRU list a page was on, as an index into the array of LRU
	63	* lists; and clears its Unevictable or Active flags, ready for freeing.
	64	*/
	65	static __always_inline enum lru_list page_off_lru(struct page *page)
	66	{
	67	enum lru_list lru;
	68
	69	if (PageUnevictable(page)) {
	70	__ClearPageUnevictable(page);
	71	lru = LRU_UNEVICTABLE;
	72	} else {
	73	lru = page_lru_base_type(page);
	74	if (PageActive(page)) {
	75	__ClearPageActive(page);
	76	lru += LRU_ACTIVE;
	77	}
	78	}
	79	return lru;
	80	}
	81
	82	/**
	83	* page_lru - which LRU list should a page be on?
	84	* @page: the page to test
	85	*
	86	* Returns the LRU list a page should be on, as an index
	87	* into the array of LRU lists.
	88	*/
	89	static __always_inline enum lru_list page_lru(struct page *page)
	90	{
	91	enum lru_list lru;
	92
	93	if (PageUnevictable(page))
	94	lru = LRU_UNEVICTABLE;
	95	else {
	96	lru = page_lru_base_type(page);
	97	if (PageActive(page))
	98	lru += LRU_ACTIVE;
	99	}
	100	return lru;
	101	}
	102
	103	#endif