linux-kernel - Re: [PATCH v2] mm: fix oom

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Message-ID: <20180508171610.GA24175@cmpxchg.org>
Date:   Tue, 8 May 2018 13:16:10 -0400
From:   Johannes Weiner <hannes@...xchg.org>
To:     Roman Gushchin <guro@...com>
Cc:     kernel-team@...com, Michal Hocko <mhocko@...nel.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Konstantin Khlebnikov <khlebnikov@...dex-team.ru>,
        linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
        linux-mm@...ck.org
Subject: Re: [PATCH v2] mm: fix oom_kill event handling

On Tue, May 08, 2018 at 01:46:37PM +0100, Roman Gushchin wrote:
> Commit e27be240df53 ("mm: memcg: make sure memory.events is
> uptodate when waking pollers") converted most of memcg event
> counters to per-memcg atomics, which made them less confusing
> for a user. The "oom_kill" counter remained untouched, so now
> it behaves differently than other counters (including "oom").
> This adds nothing but confusion.
> 
> Let's fix this by adding the MEMCG_OOM_KILL event, and follow
> the MEMCG_OOM approach. This also removes a hack from
> count_memcg_event_mm(), introduced earlier specially for the
> OOM_KILL counter.
> 
> Signed-off-by: Roman Gushchin <guro@...com>
> Cc: Johannes Weiner <hannes@...xchg.org>
> Cc: Michal Hocko <mhocko@...nel.org>
> Cc: Vladimir Davydov <vdavydov.dev@...il.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
> Cc: linux-kernel@...r.kernel.org
> Cc: cgroups@...r.kernel.org
> Cc: linux-mm@...ck.org

Acked-by: Johannes Weiner <hannes@...xchg.org>