* 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,
+ * 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.
*/
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;
+ return !PageSwapBacked(page);
}
static inline void
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);
*/
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;