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

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Message-ID: <1378795659.6046.41.camel@marge.simpson.net>
Date:	Tue, 10 Sep 2013 08:47:39 +0200
From:	Mike Galbraith <bitbucket@...ine.de>
To:	Gilad Ben-Yossef <gilad@...yossef.com>
Cc:	Christoph Lameter <cl@...ux.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Mike Frysinger <vapier@...too.org>,
	"linux-kernel@...r.kernel.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 Tue, 2013-09-10 at 09:05 +0300, Gilad Ben-Yossef wrote: 
> Hi,
> 
> On Thu, Sep 5, 2013 at 11:07 PM, Christoph Lameter <cl@...ux.com> 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=?
> >
> 
> First off, thank you for doing this. It is very useful :-)
> 
> Currently if one wishes to run a single task on an isolated CPU with
> as little interference as possible, one needs to pass
> rcu_nocbs, isolcpus, nohz_full parameters and now kthread parameter,
> all pretty much with the same values
> 
> I know some people won't like this, but can we perhaps fold all these
> into a single parameter, perhaps even the existing isolcpus?

isolcpus is supposed to go away, as cpusets can isolate CPUs, and can
turn off load balancing.

-Mike

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