linux-kernel - [PATCH] mm/swap: Use page flags to determine LRU list in __activate

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Message-Id: <20171019145657.11199-1-khandual@linux.vnet.ibm.com>
Date:   Thu, 19 Oct 2017 20:26:57 +0530
From:   Anshuman Khandual <khandual@...ux.vnet.ibm.com>
To:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc:     akpm@...ux-foundation.org, shli@...nel.org
Subject: [PATCH] mm/swap: Use page flags to determine LRU list in __activate_page()

Its already assumed that the PageActive flag is clear on the input
page, hence page_lru(page) will pick the base LRU for the page. In
the same way page_lru(page) will pick active base LRU, once the
flag PageActive is set on the page. This change of LRU list should
happen implicitly through the page flags instead of being hard
coded.

Signed-off-by: Anshuman Khandual <khandual@...ux.vnet.ibm.com>
---
 mm/swap.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/mm/swap.c b/mm/swap.c
index fcd82bc..494276b 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -275,12 +275,10 @@ static void __activate_page(struct page *page, struct lruvec *lruvec,
 {
 	if (PageLRU(page) && !PageActive(page) && !PageUnevictable(page)) {
 		int file = page_is_file_cache(page);
-		int lru = page_lru_base_type(page);
 
-		del_page_from_lru_list(page, lruvec, lru);
+		del_page_from_lru_list(page, lruvec, page_lru(page));
 		SetPageActive(page);
-		lru += LRU_ACTIVE;
-		add_page_to_lru_list(page, lruvec, lru);
+		add_page_to_lru_list(page, lruvec, page_lru(page));
 		trace_mm_lru_activate(page);
 
 		__count_vm_event(PGACTIVATE);
-- 
1.8.5.2