linux-kernel - Re: [PATCH] mm: memcontrol: fix occasional OOMs due to proportional memory.low reclaim

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Message-ID: <20210824130156.GB7802@blackbody.suse.cz>
Date:   Tue, 24 Aug 2021 15:01:56 +0200
From:   Michal Koutný <mkoutny@...e.com>
To:     Johannes Weiner <hannes@...xchg.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Leon Yang <lnyng@...com>, Chris Down <chris@...isdown.name>,
        Roman Gushchin <guro@...com>, Michal Hocko <mhocko@...e.com>,
        linux-mm@...ck.org, cgroups@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-team@...com
Subject: Re: [PATCH] mm: memcontrol: fix occasional OOMs due to proportional
 memory.low reclaim

On Mon, Aug 23, 2021 at 01:48:43PM -0400, Johannes Weiner <hannes@...xchg.org> wrote:
> Note that this isn't new behavior.

Understood, there may be a difference between:
a) a cgroup where the protected reserve was detected (this changed),
b) a cgroup where the protected memory is reclaimed.

> "The number of times the cgroup's memory.low-protected memory was
> reclaimed in order to avoid OOM during high memory pressure."

Yes, this is what I meant (i.e. events for the case b) above).

Michal