linux-kernel - Re: [PATCH 32/40] async: introduce workqueue based alternative implementation

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Message-ID: <20100117220130.214d56f1@linux.intel.com>
Date:	Sun, 17 Jan 2010 22:01:30 -0800
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	torvalds@...ux-foundation.org, mingo@...e.hu, 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, avi@...hat.com, johannes@...solutions.net,
	andi@...stfloor.org, Tejun Heo <tj@...nel.org>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: [PATCH 32/40] async: introduce workqueue based alternative
 implementation

On Mon, 18 Jan 2010 09:57:44 +0900
Tejun Heo <tj@...nel.org> wrote:

> Now that cmwq can handle high concurrency, there's no reason to
> implement separate thread pool for async.  Introduce alternative
> implementation based on workqueue.
> 


I'm sorry but I'm really not happy with this conversion;
it looses the very nice property of being able to execute and
synchronize between places at the end just before device registration.

I don't mind the implementation sharing thread pool with your stuff,
but I really really want to keep the cookie and synchronization
mechanism. There's a bunch of users of that pending and doing things
sequential entirely just is not going to cut it.


-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org
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