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

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Message-ID: <20130911220228.GB15367@somewhere>
Date:	Thu, 12 Sep 2013 00:02:30 +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>
Subject: Re: [RFC] Restrict kernel spawning of threads to a specified set of
 cpus.

On Thu, Sep 05, 2013 at 08:07:37PM +0000, 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.
> 
> os_cpus=? highlatency_cpus=?
> 
> 
> Subject: Restrict kernel spawning of threads to a specified set of cpus.
> 
> Currently the kernel by default allows kernel threads to be spawned on
> any cpu. This is a problem for low latency applications that want to
> avoid Os actions on specific processors.
> 
> Add a kernel option that restrict kthread and usermode spawning
> to a specific set of processors. Also sets the affinities of
> init by default to the restricted set since we certainly do not
> want userspace daemons etc to be started there either.
> 
> Signed-off-by: Christoph Lameter <cl@...ux.com>

Why not do this from userspace instead?

Thanks.
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