linux-kernel - Re: [PATCH REBASED] mm, memcg: Make scan aggression always exclude protection

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Message-ID: <20190322225105.GA21729@chrisdown.name>
Date:   Fri, 22 Mar 2019 22:51:05 +0000
From:   Chris Down <chris@...isdown.name>
To:     Roman Gushchin <guro@...com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>, Tejun Heo <tj@...nel.org>,
        Dennis Zhou <dennis@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "cgroups@...r.kernel.org" <cgroups@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        Kernel Team <Kernel-team@...com>
Subject: Re: [PATCH REBASED] mm, memcg: Make scan aggression always exclude
 protection

Roman Gushchin writes:
>However, we can race with the emin/elow update and end up with negative scan,
>especially if cgroup_size is about the effective protection size

Yeah, it's possible but unlikely, hence the TOCTOU check. :-)