From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Tejun Heo <htejun@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>,
LKML <linux-kernel@vger.kernel.org>,
Li Zefan <lizf@cn.fujitsu.com>, Paul Menage <paul@paulmenage.org>,
David Rientjes <rientjes@google.com>,
Thomas Gleixner <tglx@linutronix.de>,
Steven Rostedt <rostedt@goodmis.org>
Subject: Re: [patch] cpusets, cgroups: disallow attaching kthreadd
Date: Tue, 11 Oct 2011 16:08:07 +0200 [thread overview]
Message-ID: <1318342087.14615.5.camel@twins> (raw)
In-Reply-To: <20111010164339.GA8100@google.com>
On Mon, 2011-10-10 at 09:43 -0700, Tejun Heo wrote:
> Yes, I think we need something like this. wq workers were using
> PF_THREAD_BOUND to prevent diddling from userland which made some
> unhappy.
But that can be properly fixed.
> Maybe we need a flag to properly indicate "don't diddle with
> this thread from userland"? But, then, mainline kernel wouldn't need
> the current PF_THREAD_BOUND at all. Peter, Steven, what do you think?
Strict per-cpu affinity that is needed for correctness and disallows
sched_setaffinity() is something entirely different from not being
allowed to put something in a cgroup.
As to not allowing to put in a cgroup thing, is there anything other
than kthreadd for which we need to enforce that? So far I've mostly
treated it like: root can do stupid things, this is one of them, don't
do that then.
I don't think its horribly bad to change the affinity mask of kthreadd,
if a sibling kthread needs a specific affinity it should set that and
override whatever it inherits. If it runs with the default, its a neat
way of setting that.
next prev parent reply other threads:[~2011-10-11 14:08 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-23 6:21 [patch] cpusets: allow PF_THREAD_BOUND kworkers to escape from a cpuset Mike Galbraith
2011-09-23 7:00 ` Li Zefan
2011-09-23 7:19 ` Mike Galbraith
2011-09-23 9:12 ` David Rientjes
2011-09-23 9:42 ` Mike Galbraith
2011-09-23 10:53 ` Mike Galbraith
2011-09-23 13:27 ` David Rientjes
2011-09-23 14:33 ` Mike Galbraith
2011-09-23 18:16 ` Mike Galbraith
2011-09-23 20:20 ` David Rientjes
2011-09-24 3:21 ` Tejun Heo
2011-10-10 5:34 ` Mike Galbraith
2011-10-10 8:03 ` [patch] cpusets, cgroups: disallow attaching kthreadd Mike Galbraith
2011-10-10 16:43 ` Tejun Heo
2011-10-11 2:31 ` Mike Galbraith
2011-10-11 14:08 ` Peter Zijlstra [this message]
2011-10-11 16:57 ` Mike Galbraith
2011-10-12 1:22 ` David Rientjes
2011-10-12 1:45 ` Mike Galbraith
2011-10-12 1:20 ` David Rientjes
2011-10-18 8:10 ` patch] " Mike Galbraith
2011-10-18 8:16 ` David Rientjes
2011-10-18 8:42 ` Peter Zijlstra
2011-10-18 8:47 ` Mike Galbraith
2011-10-18 9:06 ` Peter Zijlstra
2011-10-18 9:23 ` Mike Galbraith
2011-10-18 10:11 ` Mike Galbraith
2011-10-18 20:38 ` David Rientjes
2011-10-19 4:00 ` Mike Galbraith
2011-10-19 4:53 ` Paul Menage
2011-10-19 4:56 ` Paul Menage
2011-10-19 5:28 ` Mike Galbraith
2011-10-19 7:50 ` Peter Zijlstra
2011-10-19 19:47 ` David Rientjes
2011-10-20 10:32 ` Peter Zijlstra
2011-10-20 21:24 ` David Rientjes
2011-10-19 4:57 ` Paul Menage
2011-10-19 5:24 ` [patch-final] " Mike Galbraith
2011-10-19 7:54 ` Peter Zijlstra
2011-10-19 8:00 ` Paul Menage
2011-10-19 8:21 ` Mike Galbraith
2011-10-26 20:27 ` David Rientjes
2011-11-10 20:51 ` David Rientjes
2011-12-06 20:13 ` David Rientjes
2011-12-06 22:47 ` Andrew Morton
2011-12-06 23:53 ` David Rientjes
2011-12-07 0:05 ` Andrew Morton
2011-12-07 3:18 ` [resubmit] " Mike Galbraith
2011-12-07 4:36 ` Mike Galbraith
2011-12-07 22:03 ` David Rientjes
2011-12-14 20:16 ` Andrew Morton
2011-12-15 2:50 ` David Rientjes
2012-01-06 22:06 ` Andrew Morton
2012-01-07 6:34 ` Mike Galbraith
2012-01-07 7:59 ` Andrew Morton
2011-12-07 22:01 ` David Rientjes
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