6c0b13519d
page_is_file_cache() has been used for both boolean checks and LRU arithmetic, which was always a bit weird. Now that page_lru_base_type() exists for LRU arithmetic, make page_is_file_cache() a real predicate function and adjust the boolean-using callsites to drop those pesky double negations. Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
95 lines
2.3 KiB
C
95 lines
2.3 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 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 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);
|
|
mem_cgroup_add_lru_list(page, 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);
|
|
mem_cgroup_del_lru_list(page, l);
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
}
|
|
|
|
static inline void
|
|
del_page_from_lru(struct zone *zone, struct page *page)
|
|
{
|
|
enum lru_list l;
|
|
|
|
list_del(&page->lru);
|
|
if (PageUnevictable(page)) {
|
|
__ClearPageUnevictable(page);
|
|
l = LRU_UNEVICTABLE;
|
|
} else {
|
|
l = page_lru_base_type(page);
|
|
if (PageActive(page)) {
|
|
__ClearPageActive(page);
|
|
l += LRU_ACTIVE;
|
|
}
|
|
}
|
|
__dec_zone_state(zone, NR_LRU_BASE + l);
|
|
mem_cgroup_del_lru_list(page, 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;
|
|
|
|
if (PageUnevictable(page))
|
|
lru = LRU_UNEVICTABLE;
|
|
else {
|
|
lru = page_lru_base_type(page);
|
|
if (PageActive(page))
|
|
lru += LRU_ACTIVE;
|
|
}
|
|
|
|
return lru;
|
|
}
|
|
|
|
#endif
|