linux-kernel - Re: [PATCH] mm/memcontrol: Skip root memcg in memcg_memory_event

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Message-ID: <20221216064210.krxtxebuwc7dijzu@google.com>
Date:   Fri, 16 Dec 2022 06:42:10 +0000
From:   Shakeel Butt <shakeelb@...gle.com>
To:     Haifeng Xu <haifeng.xu@...pee.com>
Cc:     akpm@...ux-foundation.org, roman.gushchin@...ux.dev,
        songmuchun@...edance.com, hannes@...xchg.org, vbabka@...e.cz,
        willy@...radead.org, vasily.averin@...ux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/memcontrol: Skip root memcg in memcg_memory_event_mm

On Fri, Dec 16, 2022 at 09:43:02AM +0800, Haifeng Xu wrote:
> 
> 
> On 2022/12/16 02:18, Shakeel Butt wrote:
> > On Thu, Dec 15, 2022 at 09:19:07AM +0000, Haifeng Xu wrote:
> >> The memory events aren't supported on root cgroup, so there is no need
> >> to account MEMCG_OOM_KILL on root memcg.
> >>
> > 
> > Can you explain the scenario where this is happening and causing issue
> > for you?
> > 
> If the victim selected by oom killer belongs to root memcg, memcg_memory_event_mm
> still counts the MEMCG_OOM_KILL event. This behavior is meaningless because the
> flag of events/events.local in memory_files is CFTYPE_NOT_ON_ROOT. The root memcg
> does not count any memory event.
> 

What about v1's memory.oom_control?