linux-kernel - [PATCH v2 2/3] mm, memcg: save some atomic ops when flush is already true

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Message-ID: <20210807082835.61281-3-linmiaohe@huawei.com>
Date:   Sat, 7 Aug 2021 16:28:34 +0800
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     <hannes@...xchg.org>, <mhocko@...nel.org>,
        <vdavydov.dev@...il.com>, <akpm@...ux-foundation.org>,
        <shakeelb@...gle.com>, <guro@...com>, <songmuchun@...edance.com>
CC:     <willy@...radead.org>, <alexs@...nel.org>,
        <richard.weiyang@...il.com>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>, <cgroups@...r.kernel.org>,
        <linmiaohe@...wei.com>
Subject: [PATCH v2 2/3] mm, memcg: save some atomic ops when flush is already true

Add 'else' to save some atomic ops in obj_stock_flush_required() when
flush is already true. No functional change intended here.

Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
Reviewed-by: Shakeel Butt <shakeelb@...gle.com>
Reviewed-by: Muchun Song <songmuchun@...edance.com>
Acked-by: Roman Gushchin <guro@...com>
Acked-by: Michal Hocko <mhocko@...e.com>
---
 mm/memcontrol.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 6580c2381a3e..7fe242d92802 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -2231,7 +2231,7 @@ static void drain_all_stock(struct mem_cgroup *root_memcg)
 		if (memcg && stock->nr_pages &&
 		    mem_cgroup_is_descendant(memcg, root_memcg))
 			flush = true;
-		if (obj_stock_flush_required(stock, root_memcg))
+		else if (obj_stock_flush_required(stock, root_memcg))
 			flush = true;
 		rcu_read_unlock();
 
-- 
2.23.0