140 lines
3.4 KiB
C
140 lines
3.4 KiB
C
#ifndef LINUX_MM_INLINE_H
|
|
#define LINUX_MM_INLINE_H
|
|
|
|
/**
|
|
* page_is_file_cache - should the page be on a file LRU or anon LRU?
|
|
* @page: the page to test
|
|
*
|
|
* Returns LRU_FILE 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)
|
|
{
|
|
if (PageSwapBacked(page))
|
|
return 0;
|
|
|
|
/* The page is page cache backed by a normal filesystem. */
|
|
return LRU_FILE;
|
|
}
|
|
|
|
static inline void
|
|
add_page_to_lru_list(struct zone *zone, struct page *page, enum lru_list l)
|
|
{
|
|
list_add(&page->lru, &zone->lru[l].list);
|
|
__inc_zone_state(zone, NR_LRU_BASE + l);
|
|
}
|
|
|
|
static inline void
|
|
del_page_from_lru_list(struct zone *zone, struct page *page, enum lru_list l)
|
|
{
|
|
list_del(&page->lru);
|
|
__dec_zone_state(zone, NR_LRU_BASE + l);
|
|
}
|
|
|
|
static inline void
|
|
add_page_to_inactive_anon_list(struct zone *zone, struct page *page)
|
|
{
|
|
add_page_to_lru_list(zone, page, LRU_INACTIVE_ANON);
|
|
}
|
|
|
|
static inline void
|
|
add_page_to_active_anon_list(struct zone *zone, struct page *page)
|
|
{
|
|
add_page_to_lru_list(zone, page, LRU_ACTIVE_ANON);
|
|
}
|
|
|
|
static inline void
|
|
add_page_to_inactive_file_list(struct zone *zone, struct page *page)
|
|
{
|
|
add_page_to_lru_list(zone, page, LRU_INACTIVE_FILE);
|
|
}
|
|
|
|
static inline void
|
|
add_page_to_active_file_list(struct zone *zone, struct page *page)
|
|
{
|
|
add_page_to_lru_list(zone, page, LRU_ACTIVE_FILE);
|
|
}
|
|
|
|
static inline void
|
|
del_page_from_inactive_anon_list(struct zone *zone, struct page *page)
|
|
{
|
|
del_page_from_lru_list(zone, page, LRU_INACTIVE_ANON);
|
|
}
|
|
|
|
static inline void
|
|
del_page_from_active_anon_list(struct zone *zone, struct page *page)
|
|
{
|
|
del_page_from_lru_list(zone, page, LRU_ACTIVE_ANON);
|
|
}
|
|
|
|
static inline void
|
|
del_page_from_inactive_file_list(struct zone *zone, struct page *page)
|
|
{
|
|
del_page_from_lru_list(zone, page, LRU_INACTIVE_FILE);
|
|
}
|
|
|
|
static inline void
|
|
del_page_from_active_file_list(struct zone *zone, struct page *page)
|
|
{
|
|
del_page_from_lru_list(zone, page, LRU_INACTIVE_FILE);
|
|
}
|
|
|
|
static inline void
|
|
del_page_from_lru(struct zone *zone, struct page *page)
|
|
{
|
|
enum lru_list l = LRU_BASE;
|
|
|
|
list_del(&page->lru);
|
|
if (PageActive(page)) {
|
|
__ClearPageActive(page);
|
|
l += LRU_ACTIVE;
|
|
}
|
|
l += page_is_file_cache(page);
|
|
__dec_zone_state(zone, NR_LRU_BASE + l);
|
|
}
|
|
|
|
/**
|
|
* 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 inline enum lru_list page_lru(struct page *page)
|
|
{
|
|
enum lru_list lru = LRU_BASE;
|
|
|
|
if (PageActive(page))
|
|
lru += LRU_ACTIVE;
|
|
lru += page_is_file_cache(page);
|
|
|
|
return lru;
|
|
}
|
|
|
|
/**
|
|
* inactive_anon_is_low - check if anonymous pages need to be deactivated
|
|
* @zone: zone to check
|
|
*
|
|
* Returns true if the zone does not have enough inactive anon pages,
|
|
* meaning some active anon pages need to be deactivated.
|
|
*/
|
|
static inline int inactive_anon_is_low(struct zone *zone)
|
|
{
|
|
unsigned long active, inactive;
|
|
|
|
active = zone_page_state(zone, NR_ACTIVE_ANON);
|
|
inactive = zone_page_state(zone, NR_INACTIVE_ANON);
|
|
|
|
if (inactive * zone->inactive_ratio < active)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
#endif
|