linux-kernel - Re: [RFC][PATCH] create workqueue threads only when needed

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Date:	Mon, 02 Feb 2009 07:40:25 -0800
From:	Daniel Walker <dwalker@...o99.com>
To:	Frédéric Weisbecker <fweisbec@...il.com>
Cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [RFC][PATCH] create workqueue threads only when needed

On Mon, 2009-02-02 at 15:51 +0100, Frédéric Weisbecker wrote:
> 2009/2/2 Daniel Walker <dwalker@...o99.com>:
> > On Tue, 2009-01-27 at 01:17 +0100, Frederic Weisbecker wrote:
> >
> >> All of the workqueues with 0 work inserted do nothing.
> >> For several reasons:
> >>
> >> _ Unneeded built drivers for my system that create workqueue(s) when they init
> >> _ Services which need their own workqueue, for several reasons, but who receive
> >>   very rare jobs (often never)
> >> _ ...?
> >>
> >
> > Some of the workqueues you have on your system can be removed just by
> > tuning your kernel config. It's more desirable to be able to remove the
> > whole unused feature since that's all unused memory beyond just
> > thread ..
> >
> > Daniel
> 
> 
> Yes of course. I just think about the distros which enable a lot of
> options by default.

The problem is that your just removing the visible part of the memory
waste .. Even distros can/do use modules where some of these features
wouldn't get loaded.

I think it's a better policy to assume if a kernel has a feature enabled
that feature will get used, including the workqueue.

Daniel

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