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From:   Alex Shi <alex.shi@linux.alibaba.com>
To:     akpm@linux-foundation.org, mgorman@techsingularity.net,
        tj@kernel.org, hughd@google.com, khlebnikov@yandex-team.ru,
        daniel.m.jordan@oracle.com, willy@infradead.org,
        hannes@cmpxchg.org, lkp@intel.com, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org, cgroups@vger.kernel.org,
        shakeelb@google.com, iamjoonsoo.kim@lge.com,
        richard.weiyang@gmail.com, kirill@shutemov.name,
        alexander.duyck@gmail.com, rong.a.chen@intel.com, mhocko@suse.com,
        vdavydov.dev@gmail.com, shy828301@gmail.com
Cc:     Alexander Duyck <alexander.h.duyck@linux.intel.com>,
        Michal Hocko <mhocko@kernel.org>
Subject: [PATCH v20 12/20] mm/vmscan: remove lruvec reget in move_pages_to_lru
Date:   Thu, 29 Oct 2020 18:44:57 +0800
Message-Id: <1603968305-8026-13-git-send-email-alex.shi@linux.alibaba.com>
In-Reply-To: <1603968305-8026-1-git-send-email-alex.shi@linux.alibaba.com>
References: <1603968305-8026-1-git-send-email-alex.shi@linux.alibaba.com>
Precedence: bulk

A isolated page shouldn't be recharged by memcg since the memcg
migration isn't possible at the time.
So remove unnecessary regetting.

Thanks to Alexander Duyck for pointing this out.

Signed-off-by: Alex Shi <alex.shi@linux.alibaba.com>
Acked-by: Hugh Dickins <hughd@google.com>
Cc: Alexander Duyck <alexander.h.duyck@linux.intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Hugh Dickins <hughd@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: linux-mm@kvack.org
Cc: linux-kernel@vger.kernel.org
Cc: cgroups@vger.kernel.org
---
 mm/vmscan.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 42bac12aacb4..845733afccde 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1887,7 +1887,8 @@ static unsigned noinline_for_stack move_pages_to_lru(struct lruvec *lruvec,
 			continue;
 		}
 
-		lruvec = mem_cgroup_page_lruvec(page, pgdat);
+		VM_BUG_ON_PAGE(mem_cgroup_page_lruvec(page, page_pgdat(page))
+							!= lruvec, page);
 		lru = page_lru(page);
 		nr_pages = thp_nr_pages(page);
 
-- 
1.8.3.1