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

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Message-ID: <alpine.DEB.2.11.1507101404220.28942@east.gentwo.org>
Date:	Fri, 10 Jul 2015 14:05:56 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Frederic Weisbecker <fweisbec@...il.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, 10 Jul 2015, Frederic Weisbecker wrote:

> Note that nohz full is perfectly fine with that. The issue I'm worried about
> is the case where drivers spawn hundreds of jobs and it all happen on the same
> node because the kernel threads inherit the workqueue affinity, instead of
> the global affinity that khelper had.

Well if this is working as intended here then the kernel threads will only
run on a specific cpu. As far as we can tell the amout of kernel threads
spawned is rather low and also the performance requirements on those
threads are low.

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