linux-kernel - Re: [PATCH v4 3/5] mm: memcontrol: change ug->dummy

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Message-ID: <CALvZod7d-6UH+6CTWyH44W8YuzsC3TyaHwdtQSs9a+65hJr2UQ@mail.gmail.com>
Date:   Thu, 18 Mar 2021 18:22:39 -0700
From:   Shakeel Butt <shakeelb@...gle.com>
To:     Muchun Song <songmuchun@...edance.com>
Cc:     Roman Gushchin <guro@...com>, Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux MM <linux-mm@...ck.org>,
        Xiongchun duan <duanxiongchun@...edance.com>
Subject: Re: [PATCH v4 3/5] mm: memcontrol: change ug->dummy_page only if
 memcg changed

On Thu, Mar 18, 2021 at 4:08 AM Muchun Song <songmuchun@...edance.com> wrote:
>
> Just like assignment to ug->memcg, we only need to update ug->dummy_page
> if memcg changed. So move it to there. This is a very small optimization.
>
> Signed-off-by: Muchun Song <songmuchun@...edance.com>

Reviewed-by: Shakeel Butt <shakeelb@...gle.com>