Re: [RFC] Restrict kernel spawning of threads to a specified set ofcpus.

From: Frederic Weisbecker
Date: Thu Sep 12 2013 - 10:31:47 EST


On Thu, Sep 12, 2013 at 02:22:43PM +0000, Christoph Lameter wrote:
> On Thu, 12 Sep 2013, Frederic Weisbecker 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.
>
> Ok but at that point kthread has already spawned a lot of kernel threads.
>
> The same is true for init and kmod.
>

Ok but then we just need to set the affinity of all these kthreads.
A simple lookup on /proc/[0-9]+/ should do the trick.
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