linux-kernel - Re: [PATCH v5 09/16] mm: memcontrol: move memcg_online_kmem() to mem_cgroup_css

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Message-ID: <Yd3Xx/ZX0CY68bEv@carbon.dhcp.thefacebook.com>
Date:   Tue, 11 Jan 2022 11:17:27 -0800
From:   Roman Gushchin <guro@...com>
To:     Muchun Song <songmuchun@...edance.com>
CC:     <willy@...radead.org>, <akpm@...ux-foundation.org>,
        <hannes@...xchg.org>, <mhocko@...nel.org>,
        <vdavydov.dev@...il.com>, <shakeelb@...gle.com>,
        <shy828301@...il.com>, <alexs@...nel.org>,
        <richard.weiyang@...il.com>, <david@...morbit.com>,
        <trond.myklebust@...merspace.com>, <anna.schumaker@...app.com>,
        <jaegeuk@...nel.org>, <chao@...nel.org>,
        <kari.argillander@...il.com>, <linux-fsdevel@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
        <linux-nfs@...r.kernel.org>, <zhengqi.arch@...edance.com>,
        <duanxiongchun@...edance.com>, <fam.zheng@...edance.com>,
        <smuchun@...il.com>
Subject: Re: [PATCH v5 09/16] mm: memcontrol: move memcg_online_kmem() to
 mem_cgroup_css_online()

On Mon, Dec 20, 2021 at 04:56:42PM +0800, Muchun Song wrote:
> It will simplify the code if moving memcg_online_kmem() to
> mem_cgroup_css_online() and do not need to set ->kmemcg_id
> to -1 to indicate the memcg is offline. In the next patch,
> ->kmemcg_id will be used to sync list lru reparenting which
> requires not to change ->kmemcg_id.
> 
> Signed-off-by: Muchun Song <songmuchun@...edance.com>

Nice!

Acked-by: Roman Gushchin <guro@...com>