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

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Message-ID: <0000014109b69026-f9c6e053-c813-4573-bb13-1d2bb37320c2-000000@email.amazonses.com>
Date:	Tue, 10 Sep 2013 21:11:01 +0000
From:	Christoph Lameter <cl@...ux.com>
To:	Rob Landley <rob@...dley.net>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Gilad Ben-Yossef <gilad@...yossef.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Frederic Weisbecker <fweisbec@...il.com>,
	linux-kernel@...r.kernel.org,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [RFC] Restrict kernel spawning of threads to a specified set of
 cpus.

On Tue, 10 Sep 2013, Rob Landley wrote:

> On 09/05/2013 03:07:37 PM, Christoph Lameter wrote:
> > I am not sure how to call this kernel option but we need something like
> > that. I see drivers and the kernel spawning processes on the nohz cores.
> > The name kthread is not really catching the purpose.
>
> Can't you just use the CPU affinity of PID 1 for this? Since it's a process
> that's always there and already has a mask and all. No need for a new
> interface...

How would you set the affinity of pid 1 before init starts spawning
threads?

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