linux-kernel - Re: [RFC PATCH] mm/oom_kill: allow oom kill allocating task for non-global case

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Message-ID: <20210611092743.lsxfavezj3sps5ay@ava.usersys.com>
Date:   Fri, 11 Jun 2021 10:27:43 +0100
From:   Aaron Tomlin <atomlin@...hat.com>
To:     Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Cc:     Michal Hocko <mhocko@...e.com>, Waiman Long <llong@...hat.com>,
        Shakeel Butt <shakeelb@...gle.com>,
        Linux MM <linux-mm@...ck.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH] mm/oom_kill: allow oom kill allocating task for
 non-global case

On Thu 2021-06-10 23:06 +0900, Tetsuo Handa wrote:
> Yes, marking ineligible (i.e. oom_badness() returning LONG_MIN) tasks
> would be useful.

Sure. I'll send a patch to append this information; and the reason why
i.e. "yes: oom skipped" or "yes: oom score" or "yes: vfork" to dump_task()
with the use of some helper function e.g. is_task_eligible_oom().

> By the way, was the task namely "node" (i.e. PID 1703345) multithreaded
> program?

Unfortunately, I cannot confirm since the scenario/or situation is no
longer present in the vmcore; albeit, I believe so.

> Your kernel might want commit 7775face207922ea ("memcg: killed threads
> should not invoke memcg OOM killer").

Tetsuo-san,

Yes, this does appear to be a match.
Thanks for this.


Kind regards,

-- 
Aaron Tomlin