linux-kernel - [PATCH v9 73/96] mm/lru: Add folio_lru and folio_is_file

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Date:   Wed,  5 May 2021 16:06:05 +0100
From:   "Matthew Wilcox (Oracle)" <willy@...radead.org>
To:     linux-fsdevel@...r.kernel.org, linux-mm@...ck.org
Cc:     "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v9 73/96] mm/lru: Add folio_lru and folio_is_file_lru

Convert page_lru() to call folio_lru() and convert page_is_file_lru()
to call folio_is_file_lru().  All pages on the LRUs are folios (because
tail pages use the space for the LRU list as compound_head), so all
callers can be converted.

Saves 637 bytes of kernel text; no functions grow.

Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
---
 include/linux/mm_inline.h | 44 ++++++++++++++++++++++++---------------
 1 file changed, 27 insertions(+), 17 deletions(-)

diff --git a/include/linux/mm_inline.h b/include/linux/mm_inline.h
index 355ea1ee32bd..c03b12ea0b7b 100644
--- a/include/linux/mm_inline.h
+++ b/include/linux/mm_inline.h
@@ -6,22 +6,27 @@
 #include <linux/swap.h>
 
 /**
- * page_is_file_lru - should the page be on a file LRU or anon LRU?
- * @page: the page to test
+ * folio_is_file_lru - should the folio be on a file LRU or anon LRU?
+ * @folio: the folio 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.
+ * Returns 1 if @folio is a regular filesystem backed page cache folio
+ * or a lazily freed anonymous folio (e.g. via MADV_FREE).  Returns 0 if
+ * @folio is a normal anonymous folio, a tmpfs folio or otherwise ram or
+ * swap backed folio.  Used by functions that manipulate the LRU lists,
+ * to sort a folio 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
+ * needs to survive until the folio is last deleted from the LRU, which
  * could be as far down as __page_cache_release.
  */
+static inline int folio_is_file_lru(struct folio *folio)
+{
+	return !folio_swapbacked(folio);
+}
+
 static inline int page_is_file_lru(struct page *page)
 {
-	return !PageSwapBacked(page);
+	return folio_is_file_lru(page_folio(page));
 }
 
 static __always_inline void update_lru_size(struct lruvec *lruvec,
@@ -57,28 +62,33 @@ static __always_inline void __clear_page_lru_flags(struct page *page)
 }
 
 /**
- * page_lru - which LRU list should a page be on?
- * @page: the page to test
+ * folio_lru_list - which LRU list should a folio be on?
+ * @folio: the folio to test
  *
- * Returns the LRU list a page should be on, as an index
+ * Returns the LRU list a folio should be on, as an index
  * into the array of LRU lists.
  */
-static __always_inline enum lru_list page_lru(struct page *page)
+static __always_inline enum lru_list folio_lru_list(struct folio *folio)
 {
 	enum lru_list lru;
 
-	VM_BUG_ON_PAGE(PageActive(page) && PageUnevictable(page), page);
+	VM_BUG_ON_FOLIO(folio_active(folio) && folio_unevictable(folio), folio);
 
-	if (PageUnevictable(page))
+	if (folio_unevictable(folio))
 		return LRU_UNEVICTABLE;
 
-	lru = page_is_file_lru(page) ? LRU_INACTIVE_FILE : LRU_INACTIVE_ANON;
-	if (PageActive(page))
+	lru = folio_is_file_lru(folio) ? LRU_INACTIVE_FILE : LRU_INACTIVE_ANON;
+	if (folio_active(folio))
 		lru += LRU_ACTIVE;
 
 	return lru;
 }
 
+static __always_inline enum lru_list page_lru(struct page *page)
+{
+	return folio_lru_list(page_folio(page));
+}
+
 static __always_inline void add_page_to_lru_list(struct page *page,
 				struct lruvec *lruvec)
 {
-- 
2.30.2