linux-kernel - Re: [RFC] Restrict kernel spawning of threads to a specified set of cpus.

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Message-ID: <20130913140422.GE4844@somewhere>
Date:	Fri, 13 Sep 2013 16:04:24 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Gilad Ben-Yossef <gilad@...yossef.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Mike Frysinger <vapier@...too.org>,
	linux-kernel@...r.kernel.org,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [RFC] Restrict kernel spawning of threads to a specified set of
 cpus.

On Fri, Sep 13, 2013 at 01:45:55PM +0000, Christoph Lameter wrote:
> On Thu, 12 Sep 2013, Frederic Weisbecker wrote:
> 
> > So yeah it's a problem in theory. Now in practice, I have yet to be convinced because
> > this should be solved after a few iterations in /proc in most cases.
> 
> I have seen some drivers regularly spawning threads all over the machnine.
> This is a practical issue that I am addresing.
> >
> > Now the issue doesn't only concern kthreads but all tasks in the system.
> > If we really want to solve that race, then may be we can think of a kernel_parameter
> > that sets the initial affinity of init and then lets get it naturally inherited
> > through the whole tree.
> 
> This patch that we are discussing does exactly that.
> 

Indeed, I just looked that again and your cpu_kthread_mask actually also applies to init.
cpu_init_mask would be a better name I think.
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