linux-kernel - [PATCH 12/25] mm: Add mark_folio

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Date:   Wed, 16 Dec 2020 18:23:22 +0000
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 12/25] mm: Add mark_folio_accessed

This already operated on the entire compound page, but now we can avoid
calling compound_head quite so many times.

Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
---
 include/linux/swap.h |  8 ++++++--
 mm/swap.c            | 28 +++++++++++++---------------
 2 files changed, 19 insertions(+), 17 deletions(-)

diff --git a/include/linux/swap.h b/include/linux/swap.h
index 5bba15ac5a2e..c097bc9cedd9 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -338,7 +338,7 @@ extern void lru_note_cost(struct lruvec *lruvec, bool file,
 			  unsigned int nr_pages);
 extern void lru_note_cost_page(struct page *);
 extern void lru_cache_add(struct page *);
-extern void mark_page_accessed(struct page *);
+void mark_folio_accessed(struct folio *);
 extern void lru_add_drain(void);
 extern void lru_add_drain_cpu(int cpu);
 extern void lru_add_drain_cpu_zone(struct zone *zone);
@@ -348,10 +348,14 @@ extern void deactivate_file_page(struct page *page);
 extern void deactivate_page(struct page *page);
 extern void mark_page_lazyfree(struct page *page);
 extern void swap_setup(void);
-
 extern void lru_cache_add_inactive_or_unevictable(struct page *page,
 						struct vm_area_struct *vma);
 
+static inline void mark_page_accessed(struct page *page)
+{
+	mark_folio_accessed(page_folio(page));
+}
+
 /* linux/mm/vmscan.c */
 extern unsigned long zone_reclaimable_pages(struct zone *zone);
 extern unsigned long try_to_free_pages(struct zonelist *zonelist, int order,
diff --git a/mm/swap.c b/mm/swap.c
index 490553f3f9ef..c3638a13987f 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -411,36 +411,34 @@ static void __lru_cache_activate_page(struct page *page)
  * When a newly allocated page is not yet visible, so safe for non-atomic ops,
  * __SetPageReferenced(page) may be substituted for mark_page_accessed(page).
  */
-void mark_page_accessed(struct page *page)
+void mark_folio_accessed(struct folio *folio)
 {
-	page = compound_head(page);
-
-	if (!PageReferenced(page)) {
-		SetPageReferenced(page);
-	} else if (PageUnevictable(page)) {
+	if (!FolioReferenced(folio)) {
+		SetFolioReferenced(folio);
+	} else if (FolioUnevictable(folio)) {
 		/*
 		 * Unevictable pages are on the "LRU_UNEVICTABLE" list. But,
 		 * this list is never rotated or maintained, so marking an
 		 * evictable page accessed has no effect.
 		 */
-	} else if (!PageActive(page)) {
+	} else if (!FolioActive(folio)) {
 		/*
 		 * If the page is on the LRU, queue it for activation via
 		 * lru_pvecs.activate_page. Otherwise, assume the page is on a
 		 * pagevec, mark it active and it'll be moved to the active
 		 * LRU on the next drain.
 		 */
-		if (PageLRU(page))
-			activate_page(page);
+		if (FolioLRU(folio))
+			activate_page(&folio->page);
 		else
-			__lru_cache_activate_page(page);
-		ClearPageReferenced(page);
-		workingset_activation(page);
+			__lru_cache_activate_page(&folio->page);
+		ClearFolioReferenced(folio);
+		workingset_activation(&folio->page);
 	}
-	if (page_is_idle(page))
-		clear_page_idle(page);
+	if (page_is_idle(&folio->page))
+		clear_page_idle(&folio->page);
 }
-EXPORT_SYMBOL(mark_page_accessed);
+EXPORT_SYMBOL(mark_folio_accessed);
 
 /**
  * lru_cache_add - add a page to a page list
-- 
2.29.2