Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
MIME-Version: 1.0
References: <20210330101531.82752-1-songmuchun@bytedance.com>
 <CALvZod4xHNmTQMd+zg71s7uyXUHEfwnQ-zqRXSWphwi9RogeNg@mail.gmail.com>
 <YGN0141iu5HTGiNJ@carbon.dhcp.thefacebook.com> <YGOYYgWbwiYlKmzV@cmpxchg.org>
 <YGOgth4IUflVE/Me@carbon.dhcp.thefacebook.com> <YGSSemLLpiHJHanV@cmpxchg.org>
 <CAMZfGtVYMDt_3CyH1g8d+Sey8J+W2HVY73xwCk_anm3UgHcr0w@mail.gmail.com> <CALvZod6EeDeb8S-LT8BgFP=KqUKqGS-EnRTKCy+ajAthMC2Vfw@mail.gmail.com>
In-Reply-To: <CALvZod6EeDeb8S-LT8BgFP=KqUKqGS-EnRTKCy+ajAthMC2Vfw@mail.gmail.com>
From:   Muchun Song <songmuchun@bytedance.com>
Date:   Fri, 2 Apr 2021 11:14:23 +0800
Message-ID: <CAMZfGtVdbu96msmft8k8+uGh4-ttYR4zyyZU_yRSpBU_vxhAcg@mail.gmail.com>
Subject: Re: [External] Re: [RFC PATCH 00/15] Use obj_cgroup APIs to charge
 the LRU pages
To:     Shakeel Butt <shakeelb@google.com>
Cc:     Johannes Weiner <hannes@cmpxchg.org>, Roman Gushchin <guro@fb.com>,
        Greg Thelen <gthelen@google.com>,
        Michal Hocko <mhocko@kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Vladimir Davydov <vdavydov.dev@gmail.com>,
        LKML <linux-kernel@vger.kernel.org>,
        Linux MM <linux-mm@kvack.org>,
        Xiongchun duan <duanxiongchun@bytedance.com>
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

On Fri, Apr 2, 2021 at 1:15 AM Shakeel Butt <shakeelb@google.com> wrote:
>
> On Thu, Apr 1, 2021 at 9:08 AM Muchun Song <songmuchun@bytedance.com> wrote:
> >
> [...]
> > > The zombie issue is a pretty urgent concern that has caused several
> > > production emergencies now. It needs a fix sooner rather than later.
> >
> > Thank you very much for clarifying the problem for me. I do agree
> > with you. This issue should be fixed ASAP. Using objcg is a good
> > choice. Dying objcg should not be a problem. Because the size of
> > objcg is so small compared to memcg.
> >
>
> Just wanted to say out loud that yes this patchset will reduce the
> memcg zombie issue but this is not the final destination. We should
> continue the discussions on sharing/reusing scenarios.

Yeah. Reducing the zombie memcg is not the final destination.
But it is an optimization. OK. The discussions about sharing/reusing
is also welcome.

>
> Muchun, can you please also CC Hugh Dickins and Alex Shi in the next
> version of your patchset?

No problem. I will cc Alex Shi in the next version.