linux-kernel - Re: [RFC PATCH 0/8] memory recharging for offline memcgs

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Message-ID: <CAJD7tkYhu3g9u7HkUTFBtT3Q4edVZ2g1TWV1FDcyM9srrYCBLg@mail.gmail.com>
Date:   Thu, 20 Jul 2023 14:34:16 -0700
From:   Yosry Ahmed <yosryahmed@...gle.com>
To:     Tejun Heo <tj@...nel.org>
Cc:     Johannes Weiner <hannes@...xchg.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...nel.org>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Shakeel Butt <shakeelb@...gle.com>,
        Muchun Song <muchun.song@...ux.dev>,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        Zefan Li <lizefan.x@...edance.com>,
        Yu Zhao <yuzhao@...gle.com>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Iurii Zaikin <yzaikin@...gle.com>,
        "T.J. Mercier" <tjmercier@...gle.com>,
        Greg Thelen <gthelen@...gle.com>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, cgroups@...r.kernel.org
Subject: Re: [RFC PATCH 0/8] memory recharging for offline memcgs

On Thu, Jul 20, 2023 at 12:57 PM Tejun Heo <tj@...nel.org> wrote:
>
> On Thu, Jul 20, 2023 at 11:35:15AM -0400, Johannes Weiner wrote:
> > It could also be argued that if you don't want to lose control over a
> > set of resources, then maybe don't delete their control domain while
> > they are still alive and in use. For example, when restarting a
> > workload, and the new instance is expected to have largely the same
> > workingset, consider reusing the cgroup instead of making a new one.
>
> Or just create a nesting layer so that there's a cgroup which represents the
> persistent resources and a nested cgroup instance inside representing the
> current instance.

In practice it is not easy to know exactly which resources are shared
and used by which cgroups, especially in a large dynamic environment.

>
> Thanks.
>
> --
> tejun