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

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Message-ID: <YFNtim0E1536F7ya@cmpxchg.org>
Date:   Thu, 18 Mar 2021 11:11:06 -0400
From:   Johannes Weiner <hannes@...xchg.org>
To:     Muchun Song <songmuchun@...edance.com>
Cc:     guro@...com, mhocko@...nel.org, akpm@...ux-foundation.org,
        shakeelb@...gle.com, vdavydov.dev@...il.com,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        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 07:06:56PM +0800, Muchun Song 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>

Acked-by: Johannes Weiner <hannes@...xchg.org>