| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef LINUX_MM_INLINE_H |
| #define LINUX_MM_INLINE_H |
| |
| #include <linux/huge_mm.h> |
| #include <linux/swap.h> |
| #include <linux/string.h> |
| |
| /** |
| * page_is_file_lru - should the page be on a file LRU or anon LRU? |
| * @page: the page to test |
| * |
| * Returns 1 if @page is a regular filesystem backed page cache page or a lazily |
| * freed anonymous page (e.g. via MADV_FREE). Returns 0 if @page is a normal |
| * anonymous page, a tmpfs page or otherwise ram or swap backed page. 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_lru(struct page *page) |
| { |
| return !PageSwapBacked(page); |
| } |
| |
| static __always_inline void __update_lru_size(struct lruvec *lruvec, |
| enum lru_list lru, enum zone_type zid, |
| int nr_pages) |
| { |
| struct pglist_data *pgdat = lruvec_pgdat(lruvec); |
| |
| __mod_lruvec_state(lruvec, NR_LRU_BASE + lru, nr_pages); |
| __mod_zone_page_state(&pgdat->node_zones[zid], |
| NR_ZONE_LRU_BASE + lru, nr_pages); |
| } |
| |
| static __always_inline void update_lru_size(struct lruvec *lruvec, |
| enum lru_list lru, enum zone_type zid, |
| int nr_pages) |
| { |
| __update_lru_size(lruvec, lru, zid, nr_pages); |
| #ifdef CONFIG_MEMCG |
| mem_cgroup_update_lru_size(lruvec, lru, zid, nr_pages); |
| #endif |
| } |
| |
| static __always_inline void add_page_to_lru_list(struct page *page, |
| struct lruvec *lruvec, enum lru_list lru) |
| { |
| update_lru_size(lruvec, lru, page_zonenum(page), thp_nr_pages(page)); |
| list_add(&page->lru, &lruvec->lists[lru]); |
| } |
| |
| static __always_inline void add_page_to_lru_list_tail(struct page *page, |
| struct lruvec *lruvec, enum lru_list lru) |
| { |
| update_lru_size(lruvec, lru, page_zonenum(page), thp_nr_pages(page)); |
| list_add_tail(&page->lru, &lruvec->lists[lru]); |
| } |
| |
| static __always_inline void del_page_from_lru_list(struct page *page, |
| struct lruvec *lruvec, enum lru_list lru) |
| { |
| list_del(&page->lru); |
| update_lru_size(lruvec, lru, page_zonenum(page), -thp_nr_pages(page)); |
| } |
| |
| /** |
| * 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_lru(page)) |
| return LRU_INACTIVE_FILE; |
| return LRU_INACTIVE_ANON; |
| } |
| |
| /** |
| * page_off_lru - which LRU list was page on? clearing its lru flags. |
| * @page: the page to test |
| * |
| * Returns the LRU list a page was on, as an index into the array of LRU |
| * lists; and clears its Unevictable or Active flags, ready for freeing. |
| */ |
| 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; |
| } |
| |
| /** |
| * 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 __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; |
| } |
| |
| #ifdef CONFIG_ANON_VMA_NAME |
| /* |
| * mmap_lock should be read-locked when calling anon_vma_name(). Caller should |
| * either keep holding the lock while using the returned pointer or it should |
| * raise anon_vma_name refcount before releasing the lock. |
| */ |
| extern struct anon_vma_name *anon_vma_name(struct vm_area_struct *vma); |
| extern struct anon_vma_name *anon_vma_name_alloc(const char *name); |
| extern void anon_vma_name_free(struct kref *kref); |
| |
| /* mmap_lock should be read-locked */ |
| static inline void anon_vma_name_get(struct anon_vma_name *anon_name) |
| { |
| if (anon_name) |
| kref_get(&anon_name->kref); |
| } |
| |
| static inline void anon_vma_name_put(struct anon_vma_name *anon_name) |
| { |
| if (anon_name) |
| kref_put(&anon_name->kref, anon_vma_name_free); |
| } |
| |
| static inline |
| struct anon_vma_name *anon_vma_name_reuse(struct anon_vma_name *anon_name) |
| { |
| /* Prevent anon_name refcount saturation early on */ |
| if (kref_read(&anon_name->kref) < REFCOUNT_MAX) { |
| anon_vma_name_get(anon_name); |
| return anon_name; |
| |
| } |
| return anon_vma_name_alloc(anon_name->name); |
| } |
| |
| static inline void dup_anon_vma_name(struct vm_area_struct *orig_vma, |
| struct vm_area_struct *new_vma) |
| { |
| struct anon_vma_name *anon_name = anon_vma_name(orig_vma); |
| |
| if (anon_name) |
| new_vma->anon_name = anon_vma_name_reuse(anon_name); |
| } |
| |
| static inline void free_anon_vma_name(struct vm_area_struct *vma) |
| { |
| /* |
| * Not using anon_vma_name because it generates a warning if mmap_lock |
| * is not held, which might be the case here. |
| */ |
| if (!vma->vm_file) |
| anon_vma_name_put(vma->anon_name); |
| } |
| |
| static inline bool anon_vma_name_eq(struct anon_vma_name *anon_name1, |
| struct anon_vma_name *anon_name2) |
| { |
| if (anon_name1 == anon_name2) |
| return true; |
| |
| return anon_name1 && anon_name2 && |
| !strcmp(anon_name1->name, anon_name2->name); |
| } |
| #else /* CONFIG_ANON_VMA_NAME */ |
| static inline struct anon_vma_name *anon_vma_name(struct vm_area_struct *vma) |
| { |
| return NULL; |
| } |
| |
| static inline struct anon_vma_name *anon_vma_name_alloc(const char *name) |
| { |
| return NULL; |
| } |
| |
| static inline void anon_vma_name_get(struct anon_vma_name *anon_name) {} |
| static inline void anon_vma_name_put(struct anon_vma_name *anon_name) {} |
| static inline void dup_anon_vma_name(struct vm_area_struct *orig_vma, |
| struct vm_area_struct *new_vma) {} |
| static inline void free_anon_vma_name(struct vm_area_struct *vma) {} |
| |
| static inline bool anon_vma_name_eq(struct anon_vma_name *anon_name1, |
| struct anon_vma_name *anon_name2) |
| { |
| return true; |
| } |
| |
| #endif /* CONFIG_ANON_VMA_NAME */ |
| |
| #endif |