linux-kernel - [PATCH memcg v3 0/3] memcg: prohibit unconditional exceeding the limit of dying tasks

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Date:   Sat, 23 Oct 2021 16:18:58 +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 v3 0/3] memcg: prohibit unconditional exceeding the
 limit of dying tasks

Memory cgroup charging allows killed or exiting tasks to exceed the hard
limit. It can be misused and allow to trigger global OOM from inside
memcg-limited container. On the other hand if memcg fail allocation,
called from inside #PF handler it trigger global OOM from inside
pagefault_out_of_memory().

To prevent these problems this patch set:
a) removes execution of out_of_memory() from pagefault_out_of_memory(),
   becasue nobody can explain why it is necessary.
b) allow memcg to fail allocation of dying/killed tasks.

v3: resplit, improved patch descriptions
v2: resplit,
    use old patch from Michal Hocko removing out_of_memory() from
      pagefault_out_of_memory()


Michal Hocko (1):
  mm, oom: do not trigger out_of_memory from the #PF

Vasily Averin (2):
  mm, oom: pagefault_out_of_memory: don't force global OOM for dying
    tasks
  memcg: prohibit unconditional exceeding the limit of dying tasks

 mm/memcontrol.c | 27 ++++++++-------------------
 mm/oom_kill.c   | 23 ++++++++++-------------
 2 files changed, 18 insertions(+), 32 deletions(-)

-- 
2.32.0