mm_inline.h

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#ifndef LINUX_MM_INLINE_H
#define LINUX_MM_INLINE_H

#include <linux/huge_mm.h>

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);
}

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 __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;
}

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