linux-kernel - Re: [PATCH] mm: memcg: Fix memcg reclaim soft lockup

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Message-ID: <20200826132620.GR22869@dhcp22.suse.cz>
Date:   Wed, 26 Aug 2020 15:26:20 +0200
From:   Michal Hocko <mhocko@...e.com>
To:     xunlei <xlpang@...ux.alibaba.com>
Cc:     Johannes Weiner <hannes@...xchg.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH] mm: memcg: Fix memcg reclaim soft lockup

On Wed 26-08-20 21:16:28, xunlei wrote:
[...]
> oom_reaper also can't get scheduled because of 1-cpu, and the mutex
> uses might_sleep() which is noop in case of "CONFIG_PREEMPT_VOLUNTARY is
> not set" I mentioned in the commit log.

OK, I see. I have clearly missed the 1cpu configuration. Sorry about
that.

Thanks for bearing with me.
-- 
Michal Hocko
SUSE Labs