linux-kernel - Re: workqueue thing

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Date:	Wed, 23 Dec 2009 14:00:08 +0100
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Tejun Heo <tj@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>, awalls@...ix.net,
	linux-kernel@...r.kernel.org, jeff@...zik.org,
	akpm@...ux-foundation.org, jens.axboe@...cle.com,
	rusty@...tcorp.com.au, cl@...ux-foundation.org,
	dhowells@...hat.com, arjan@...ux.intel.com, avi@...hat.com,
	johannes@...solutions.net, andi@...stfloor.org
Subject: Re: workqueue thing

Ingo Molnar wrote:
> Likewise, if there's a reduction in complexity, that is a tangible metric as 
> well: lets do a few conversions as part of the patch-set and see how much 
> simpler things have become as a result of it.

There are for example about 160 users of  create_singlethread_workqueue
(about 140 of them in drivers/.).  As has mentioned by others, many if
not most of them would be better served by either the existing slow-work
API or by the proposed worker thread pool.  Conversion to the former
takes a bit more effort than the latter (not much, but it matters).

The little driver subsystem which I maintain extensively uses the shared
workqueue and also one single-thread workqueue.  The facts that the
shared queue is used for several purposes and a single thread for some
are both just compromises which I would rather like to get rid of.  I
should have converted the create_singlethread_workqueue usage to David
Howells' slow-work infrastructure immediately when that was merged, but
I didn't do so yet because there is too much else on my to-do list for
that particular to-do item...

> We really are not forced to the space of Gedankenexperiments here.

...to actually leave Gedankenexperiment stage as quickly as I would
like.  Tejun's worker pool would make things easier for me.
-- 
Stefan Richter
-=====-==--= ==-- =-===
http://arcgraph.de/sr/
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