linux-kernel - Re: [PATCH] mm: add group_oom

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Message-ID: <YbhmJ63KXGLDpQo7@dhcp22.suse.cz>
Date:   Tue, 14 Dec 2021 10:38:47 +0100
From:   Michal Hocko <mhocko@...e.com>
To:     Dan Schatzberg <schatzberg.dan@...il.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Roman Gushchin <guro@...com>,
        Chris Down <chris@...isdown.name>,
        Johannes Weiner <hannes@...xchg.org>,
        Tejun Heo <tj@...nel.org>, Zefan Li <lizefan.x@...edance.com>,
        Jonathan Corbet <corbet@....net>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        "open list:CONTROL GROUP (CGROUP)" <cgroups@...r.kernel.org>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:CONTROL GROUP - MEMORY RESOURCE CONTROLLER (MEMCG)" 
        <linux-mm@...ck.org>
Subject: Re: [PATCH] mm: add group_oom_kill memory.event fix

On Mon 13-12-21 08:25:10, Dan Schatzberg wrote:
> Andrew, could you please amend the prior patch "mm: add group_oom_kill
> memory.event" with these changes from Johannes and Chris?
> 
> Also - small nit: it makes better sense to
> s/group_oom_kill/oom_group_kill/g in the patch title.

Agreed. This is more in line with the oom.group knob we export.
> 
> Reviewed-by: Roman Gushchin <guro@...com>
> Acked-by: Chris Down <chris@...isdown.name>
> Acked-by: Johannes Weiner <hannes@...xchg.org>
> Signed-off-by: Dan Schatzberg <schatzberg.dan@...il.com>

With these changes feel free to add
Acked-by: Michal Hocko <mhocko@...e.com>
> ---
>  Documentation/admin-guide/cgroup-v2.rst | 3 +--
>  mm/memcontrol.c                         | 3 ---
>  2 files changed, 1 insertion(+), 5 deletions(-)
> 
> diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-guide/cgroup-v2.rst
> index eec830ce2068..8269bfa240f4 100644
> --- a/Documentation/admin-guide/cgroup-v2.rst
> +++ b/Documentation/admin-guide/cgroup-v2.rst
> @@ -1269,8 +1269,7 @@ PAGE_SIZE multiple when read back.
>  		killed by any kind of OOM killer.
>  
>            oom_group_kill
> -                The number of times all tasks in the cgroup were killed
> -                due to memory.oom.group.
> +                The number of times a group OOM has occurred.
>  
>    memory.events.local
>  	Similar to memory.events but the fields in the file are local
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 5ab3b9ce90de..b5454d8fc344 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -4390,9 +4390,6 @@ static int mem_cgroup_oom_control_read(struct seq_file *sf, void *v)
>  	seq_printf(sf, "under_oom %d\n", (bool)memcg->under_oom);
>  	seq_printf(sf, "oom_kill %lu\n",
>  		   atomic_long_read(&memcg->memory_events[MEMCG_OOM_KILL]));
> -	seq_printf(sf, "oom_group_kill %lu\n",
> -		   atomic_long_read(
> -			&memcg->memory_events[MEMCG_OOM_GROUP_KILL]));
>  	return 0;
>  }
>  
> -- 
> 2.30.2

-- 
Michal Hocko
SUSE Labs