linux-kernel - [PATCH 4/4] mm: convert make_page_accessed to use compount_page

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Date:	Sun, 27 Mar 2016 22:47:40 +0300
From:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:	Eric Biggers <ebiggers3@...il.com>
Cc:	Hugh Dickins <hughd@...gle.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [PATCH 4/4] mm: convert make_page_accessed to use compount_page_t()

Just for example, convert one function to just created interface.

This way we cut size of the function by third:

function                                     old     new   delta
mark_page_accessed                           310     203    -107

Not-yet-signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
---
 mm/swap.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/mm/swap.c b/mm/swap.c
index 09fe5e97714a..1fe072ae6ee1 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -360,9 +360,10 @@ static void __lru_cache_activate_page(struct page *page)
  */
 void mark_page_accessed(struct page *page)
 {
-	page = compound_head(page);
-	if (!PageActive(page) && !PageUnevictable(page) &&
-			PageReferenced(page)) {
+	struct head_page *head = compound_head_t(page);
+	page = &head->page;
+	if (!PageActive(head) && !PageUnevictable(head) &&
+			PageReferenced(head)) {
 
 		/*
 		 * If the page is on the LRU, queue it for activation via
@@ -370,15 +371,15 @@ void mark_page_accessed(struct page *page)
 		 * pagevec, mark it active and it'll be moved to the active
 		 * LRU on the next drain.
 		 */
-		if (PageLRU(page))
+		if (PageLRU(head))
 			activate_page(page);
 		else
 			__lru_cache_activate_page(page);
-		ClearPageReferenced(page);
+		ClearPageReferenced(head);
 		if (page_is_file_cache(page))
 			workingset_activation(page);
-	} else if (!PageReferenced(page)) {
-		SetPageReferenced(page);
+	} else if (!PageReferenced(head)) {
+		SetPageReferenced(head);
 	}
 	if (page_is_idle(page))
 		clear_page_idle(page);
-- 
2.8.0.rc3