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

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Message-ID: <CAOtvUMfndvkCEauQw11ZBoBM_6sf-wGi-QruHu1FApwuL8h47w@mail.gmail.com>
Date:	Sun, 15 Sep 2013 16:47:29 +0300
From:	Gilad Ben-Yossef <gilad@...yossef.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Christoph Lameter <cl@...ux.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	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 Thu, Sep 12, 2013 at 5:16 PM, Frederic Weisbecker <fweisbec@...il.com> wrote:
> On Thu, Sep 12, 2013 at 02:10:56PM +0000, Christoph Lameter wrote:
>> On Thu, 12 Sep 2013, Frederic Weisbecker wrote:
>>
>> > Why not do this from userspace instead?
>>
>> Because the cpumasks are hardcoded in the kernel code.
>>
>
> Ok but you can change the affinity of a kthread from userspace, as
> long as you define a cpu set that is among that kthread's cpus allowed.


There is also the problem of kernel threads registering timers. We
don't have a good way to migrate those yet, I believe.

Gilad

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