Re: [PATCH] kmod: Run usermodehelpers only on cpus allowed forkthreadd

[Christoph Lameter]

On Thu, 17 Oct 2013, Frederic Weisbecker wrote:

> > The invocation is coming from keventd so the affinity seems to be set to
> > a different cpu before we get the thread moved.
>
> Looking at alloc_singlethread_workqueue(), it seems to create a kthread by using
> kthread_create(). So I guess the resulting works have the affinity of that kthread.
> And thus call_usermodehelper() initially has that affinity, until it spreads it explicitly
> to all CPUs.
>
> Couldn't we instead make kthread children (those created with kthread_create()) to inherit
> kthread initial affinity? Currently kthread's children have cpu_all_mask. We could change
> that behaviour. This way the initial kthread affinity could be inherited all along.

Some of the code relies on being able to set the affinities separately.
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