linux-kernel - Re: [PATCHSET] workqueue: concurrency managed workqueue, take#5

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Message-ID: <4C17C671.3020605@s5r6.in-berlin.de>
Date:	Tue, 15 Jun 2010 20:29:05 +0200
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	Tejun Heo <tj@...nel.org>
CC:	mingo@...e.hu, awalls@...ix.net, linux-kernel@...r.kernel.org,
	jeff@...zik.org, akpm@...ux-foundation.org, rusty@...tcorp.com.au,
	cl@...ux-foundation.org, dhowells@...hat.com,
	arjan@...ux.intel.com, johannes@...solutions.net, oleg@...hat.com,
	axboe@...nel.dk
Subject: Re: [PATCHSET] workqueue: concurrency managed workqueue, take#5

Tejun Heo wrote:
> This is the fifth take of cmwq (concurrency managed workqueue)
> patchset.  It's on top of v2.6.35-rc3 + sched/core patches.  Git tree
> is available at
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq.git review-cmwq

A comment and a question:

As a driver maintainer, I would find it helpful if the WQ_flags in
include/linux/workqueue.h and/or __create_workqueue_key() in
kernel/workqueue.c (or its wrappers in include/linux/workqueue.h) were
better documented.

How about the global workqueue, i.e. schedule_work() and friends?  At
your current review-cmwq head, they use system_wq, not system_nrt_wq.
But doesn't have the present global workqueue WQ_NON_REENTRANT
semantics?  In fact, don't have _all_ workqueues WQ_NON_REENTRANT
semantics presently?  If so, a good deal of existing users probably
relies on non-reentrant behaviour.  Or am I thoroughly misunderstanding
the meaning of WQ_NON_REENTRANT?

(Sorry if this had been discussed before; I followed the discussions of
some of your previous submissions but not all.  And PS, I am eagerly
awaiting for this to go into the mainline.)
-- 
Stefan Richter
-=====-==-=- -==- -====
http://arcgraph.de/sr/
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