linux-kernel - [PATCH memcg RFC 0/3] memcg: prohibit unconditional exceeding the limit of dying tasks

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Message-ID: <fe1d45a1-276d-b0f4-fb71-8f5c1a9e8872@virtuozzo.com>
Date:   Wed, 20 Oct 2021 15:11:35 +0300
From:   Vasily Averin <vvs@...tuozzo.com>
To:     Michal Hocko <mhocko@...nel.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Roman Gushchin <guro@...com>, Uladzislau Rezki <urezki@...il.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Shakeel Butt <shakeelb@...gle.com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        cgroups@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, kernel@...nvz.org
Subject: [PATCH memcg RFC 0/3] memcg: prohibit unconditional exceeding the
 limit of dying tasks

Dear Michal,
as you requested, I splited v4 patch version into 3 separate parts.
Let's discuss each of them.

Open questions/ToDo:

- Update patch descriptions (and add some comments) 

- in part 2 aka "memcg: remove charge forcinig for dying tasks":
  should we keep task_is_dying() in mem_cgroup_out_of_memory() ?

- in part 3 aka "memcg: handle memcg oom failures"
   what is the best way to notify pagefault_out_of_memory() about 
    mem_cgroup_out_of_memory failure ?
    
- what is the best way to handle memcg failure doe to kmem limit,
    it can trigger false global OOM

Vasily Averin (3):
  mm: do not firce global OOM from inside dying tasks
  memcg: remove charge forcinig for dying tasks
  memcg: handle memcg oom failures

 mm/memcontrol.c | 52 ++++++++++++++++++++++++++++---------------------
 mm/oom_kill.c   |  3 +++
 2 files changed, 33 insertions(+), 22 deletions(-)

-- 
2.32.0