linux-kernel - Re: [PATCH 2/5] kmod: Use system_unbound

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Message-ID: <20150710171208.GA26428@lerouge>
Date:	Fri, 10 Jul 2015 19:12:11 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Rik van Riel <riel@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 2/5] kmod: Use system_unbound_wq instead of khelper

On Fri, Jul 10, 2015 at 09:20:46AM -0500, Christoph Lameter wrote:
> On Fri, 10 Jul 2015, Frederic Weisbecker wrote:
> 
> > Now perhaps it is a good thing in the end. At least in nohz full it
> > doesn't change anything as we affine that workqueue too. But we must
> > be sure that a single NUMA node is enough to handle typical loads of
> > usermodehelper.
> 
> This is configurable right? So if you screw up you are responsible.

No it's not much configurable. The works are scheduled on tasks that are
node affine and you can't change that for system_unbound_wq. Only WQ_SYSFS
workqueues can be overriden on their no_numa property but even there that's
after the boot and most of the usermodehelper load goes on boot.
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