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

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Date:	Tue, 10 Sep 2013 09:05:49 +0300
From:	Gilad Ben-Yossef <gilad@...yossef.com>
To:	Christoph Lameter <cl@...ux.com>
Cc:	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.

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?

Thanks,
Gilad


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