linux-kernel - Re: [PATCH] kthread: run kthreadd with max priority SCHED

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Date:	Sat, 22 Dec 2007 02:52:28 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Mike Galbraith <efault@....de>
Cc:	Jon Masters <jcm@...hat.com>, Michal Schmidt <mschmidt@...hat.com>,
	linux-kernel@...r.kernel.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Satoru Takeuchi <takeuchi_satoru@...fujitsu.com>
Subject: Re: [PATCH] kthread: run kthreadd with max priority SCHED_FIFO

On Sat, 22 Dec 2007 11:39:30 +0100 Mike Galbraith <efault@....de> wrote:

> 
> On Sat, 2007-12-22 at 04:52 -0500, Jon Masters wrote:
> 
> > So, user tasks running with SCHED_FIFO should be able to lock a system?
> > I guess I see both sides of this argument - yes, it's userspace at
> > fault, but in other cases when userspace is at fault, we take action
> > (OOM, segfault, others). Isn't this situation just another case where
> > the kernel needs to avoid the evils of userland going awry?
> 
> FYI, Ingo queued the below.
> 
> http://lkml.org/lkml/2007/10/31/344
> 

That's pretty different of course, but rlimit might be a suitable interface
for implementing RLIMIT_MAX_CONTINUOUS_RT_MILLISECONDS.

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