From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrew Morton Subject: Re: [PATCH v3 3/6] memcg: Simplify mem_cgroup_force_empty_list error handling Date: Wed, 31 Oct 2012 14:30:47 -0700 Message-ID: <20121031143047.95587bff.akpm@linux-foundation.org> References: <1351251453-6140-1-git-send-email-mhocko@suse.cz> <1351251453-6140-4-git-send-email-mhocko@suse.cz> <508E8B95.406@parallels.com> <20121029150022.a595b866.akpm@linux-foundation.org> <20121030103559.GA7394@dhcp22.suse.cz> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20121030103559.GA7394-2MMpYkNvuYDjFM9bn6wA6Q@public.gmane.org> Sender: cgroups-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-ID: Content-Type: text/plain; charset="us-ascii" To: Michal Hocko Cc: Glauber Costa , linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org, cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Tejun Heo , Li Zefan , Johannes Weiner , KAMEZAWA Hiroyuki , Balbir Singh On Tue, 30 Oct 2012 11:35:59 +0100 Michal Hocko 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 :)