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mm: introduce page_lru_base_type()

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Instead of abusing page_is_file_cache() for LRU list index arithmetic, add
another helper with a more appropriate name and convert the non-boolean
users of page_is_file_cache() accordingly.

This new helper gives the LRU base type a page is supposed to live on,
inactive anon or inactive file.

[hugh.dickins@tiscali.co.uk: convert del_page_from_lru() also]
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Rik van Riel <riel@redhat.com>
Cc: Minchan Kim <minchan.kim@gmail.com>
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>
This commit is contained in:
Johannes Weiner 2009-09-21 17:02:58 -07:00 • committed by Linus Torvalds
parent b7c46d151c
commit 401a8e1c16
3 changed files with 24 additions and 9 deletions
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23
include/linux/mm_inline.h
View file

@ -39,21 +39,36 @@ del_page_from_lru_list(struct zone *zone, struct page *page, enum lru_list 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 = LRU_BASE;
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;
}
l += page_is_file_cache(page);
}
__dec_zone_state(zone, NR_LRU_BASE + l);
mem_cgroup_del_lru_list(page, l);
@ -68,14 +83,14 @@ del_page_from_lru(struct zone *zone, struct page *page)
*/
static inline enum lru_list page_lru(struct page *page)
{
enum lru_list lru = LRU_BASE;
enum lru_list lru;
if (PageUnevictable(page))
lru = LRU_UNEVICTABLE;
else {
lru = page_lru_base_type(page);
if (PageActive(page))
lru += LRU_ACTIVE;
lru += page_is_file_cache(page);
}
return lru;