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Message-Id: <20131017105026.451ce2782d573c0b7dfbbc5d@linux-foundation.org>
Date:	Thu, 17 Oct 2013 10:50:26 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Christoph Lameter <cl@...ux.com>,
	Mike Galbraith <bitbucket@...ine.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Gilad Ben-Yossef <gilad@...yossef.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Mike Frysinger <vapier@...too.org>
Subject: Re: [PATCH] kmod: Run usermodehelpers only on cpus allowed for
 kthreadd

On Thu, 17 Oct 2013 18:07:28 +0200 Frederic Weisbecker <fweisbec@...il.com> wrote:

> 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.

I'm wondering if it's clean/logical to tie usermodehelper affinity to
kthreadd affinity at all.  It's certainly convenient, but they're
distinct concepts.  What is the reason to not have a separate control
for usermodehelper cpus-allowed?
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