linux-kernel - Re: [PATCH 2/2] mm: Consider subtrees in memory.events

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Message-ID: <20190128160512.GR50184@devbig004.ftw2.facebook.com>
Date:   Mon, 28 Jan 2019 08:05:12 -0800
From:   Tejun Heo <tj@...nel.org>
To:     Shakeel Butt <shakeelb@...gle.com>
Cc:     Michal Hocko <mhocko@...nel.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Chris Down <chris@...isdown.name>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Roman Gushchin <guro@...com>, Dennis Zhou <dennis@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Cgroups <cgroups@...r.kernel.org>, Linux MM <linux-mm@...ck.org>,
        kernel-team@...com
Subject: Re: [PATCH 2/2] mm: Consider subtrees in memory.events

Hello, Shakeel.

On Mon, Jan 28, 2019 at 07:59:33AM -0800, Shakeel Butt wrote:
> Why not make this configurable at the delegation boundary? As you
> mentioned, there are jobs who want centralized workload manager to
> watch over their subtrees while there can be jobs which want to
> monitor their subtree themselves. For example I can have a job which
> know how to act when one of the children cgroup goes OOM. However if
> the root of that job goes OOM then the centralized workload manager
> should do something about it. With this change, how to implement this
> scenario? How will the central manager differentiates between that a
> subtree of a job goes OOM or the root of that job? I guess from the
> discussion it seems like the centralized manager has to traverse that
> job's subtree to find the source of OOM.
> 
> Why can't we let the implementation of centralized manager easier by
> allowing to configure the propagation of these notifications across
> delegation boundary.

I think the right way to achieve the above would be having separate
recursive and local counters.

Thanks.

-- 
tejun