linux-kernel - [PATCH v18 07/32] mm/swap.c: stop deactivate_file

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Date:   Mon, 24 Aug 2020 20:54:40 +0800
From:   Alex Shi <alex.shi@...ux.alibaba.com>
To:     akpm@...ux-foundation.org, mgorman@...hsingularity.net,
        tj@...nel.org, hughd@...gle.com, khlebnikov@...dex-team.ru,
        daniel.m.jordan@...cle.com, willy@...radead.org,
        hannes@...xchg.org, lkp@...el.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
        shakeelb@...gle.com, iamjoonsoo.kim@....com,
        richard.weiyang@...il.com, kirill@...temov.name,
        alexander.duyck@...il.com, rong.a.chen@...el.com, mhocko@...e.com,
        vdavydov.dev@...il.com, shy828301@...il.com
Cc:     Michal Hocko <mhocko@...nel.org>
Subject: [PATCH v18 07/32] mm/swap.c: stop deactivate_file_page if page not on lru

Keeping deactivate_file_page is useless if page isn't on lru list. So
let's stop it.

Signed-off-by: Alex Shi <alex.shi@...ux.alibaba.com>
Cc: Hugh Dickins <hughd@...gle.com>
Cc: Johannes Weiner <hannes@...xchg.org>
Cc: Michal Hocko <mhocko@...nel.org>
Cc: Vladimir Davydov <vdavydov.dev@...il.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org
Cc: cgroups@...r.kernel.org
Cc: linux-mm@...ck.org
---
 mm/swap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/swap.c b/mm/swap.c
index c674fb441fe9..ea9e1f538313 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -671,7 +671,7 @@ void deactivate_file_page(struct page *page)
 	 * In a workload with many unevictable page such as mprotect,
 	 * unevictable page deactivation for accelerating reclaim is pointless.
 	 */
-	if (PageUnevictable(page))
+	if (PageUnevictable(page) || !PageLRU(page))
 		return;
 
 	if (likely(get_page_unless_zero(page))) {
-- 
1.8.3.1