linux-kernel - Re: [PATCH v3 3/6] memcg: Simplify mem_cgroup_force_empty

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Message-Id: <20121031143047.95587bff.akpm@linux-foundation.org>
Date:	Wed, 31 Oct 2012 14:30:47 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Michal Hocko <mhocko@...e.cz>
Cc:	Glauber Costa <glommer@...allels.com>, linux-mm@...ck.org,
	cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
	Tejun Heo <tj@...nel.org>, Li Zefan <lizefan@...wei.com>,
	Johannes Weiner <hannes@...xchg.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Balbir Singh <bsingharora@...il.com>
Subject: Re: [PATCH v3 3/6] memcg: Simplify mem_cgroup_force_empty_list
 error handling

On Tue, 30 Oct 2012 11:35:59 +0100
Michal Hocko <mhocko@...e.cz> wrote:

> > If the kernel is uniprocessor and the caller is SCHED_FIFO: ad infinitum!
>
> ...
>
> Can we consider this as a corner case (it is much easier to kill a
> machine with SCHED_FIFO than this anyway) or the concern is really
> strong and we should come with a solution before this can get merged?

Sure.  SCHED_FIFO can be used to permanently block all kernel threads
which pretty quickly results in a very sick kernel.  My observation was
just a general moan about the SCHED_FIFO wontfix problem :)

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