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From:   Alex Shi <alex.shi@linux.alibaba.com>
To:     cgroups@vger.kernel.org, akpm@linux-foundation.org,
        mgorman@techsingularity.net, tj@kernel.org, hughd@google.com,
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        yang.shi@linux.alibaba.com, willy@infradead.org,
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Cc:     Alex Shi <alex.shi@linux.alibaba.com>,
        Michal Hocko <mhocko@kernel.org>,
        Vladimir Davydov <vdavydov.dev@gmail.com>, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org
Subject: [PATCH v9 11/20] mm/memcg: move SetPageLRU out of lru_lock in commit_charge
Date:   Mon,  2 Mar 2020 19:00:21 +0800
Message-Id: <1583146830-169516-12-git-send-email-alex.shi@linux.alibaba.com>
In-Reply-To: <1583146830-169516-1-git-send-email-alex.shi@linux.alibaba.com>
References: <1583146830-169516-1-git-send-email-alex.shi@linux.alibaba.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Since lru lock doesn't defense PageLRU anymore, move the setting out of
lock may save a bit lock contention time.

Signed-off-by: Alex Shi <alex.shi@linux.alibaba.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: cgroups@vger.kernel.org
Cc: linux-mm@kvack.org
Cc: linux-kernel@vger.kernel.org
---
 mm/memcontrol.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index f8419f3436a8..7d7b861a948c 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -2614,9 +2614,9 @@ static void commit_charge(struct page *page, struct mem_cgroup *memcg,
 		lruvec = mem_cgroup_page_lruvec(page, pgdat);
 
 		VM_BUG_ON_PAGE(PageLRU(page), page);
-		SetPageLRU(page);
 		add_page_to_lru_list(page, lruvec, page_lru(page));
 		spin_unlock_irq(&pgdat->lru_lock);
+		SetPageLRU(page);
 	}
 }
 
-- 
1.8.3.1