lru_add_page

#ifdef CONFIG_TRANSPARENT_HUGEPAGE
/* used by __split_huge_page_refcount() */
void lru_add_page_tail(struct page *page, struct page *page_tail,
               struct lruvec *lruvec, struct list_head *list)
{
    const int file = 0;
 
    VM_BUG_ON_PAGE(!PageHead(page), page);
    VM_BUG_ON_PAGE(PageCompound(page_tail), page);
    VM_BUG_ON_PAGE(PageLRU(page_tail), page);
    lockdep_assert_held(&lruvec_pgdat(lruvec)->lru_lock);
 
    if (!list)
        SetPageLRU(page_tail);
 
    if (likely(PageLRU(page)))
        list_add_tail(&page_tail->lru, &page->lru);
    else if (list) {
        /* page reclaim is reclaiming a huge page */
        get_page(page_tail);
        list_add_tail(&page_tail->lru, list);
    } else {
        /*
         * Head page has not yet been counted, as an hpage,
         * so we must account for each subpage individually.
         *
         * Put page_tail on the list at the correct position
         * so they all end up in order.
         */
        add_page_to_lru_list_tail(page_tail, lruvec,
                      page_lru(page_tail));
    }
 
    if (!PageUnevictable(page))
        update_page_reclaim_stat(lruvec, file, PageActive(page_tail));
}
函数源码
