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

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Message-ID: <4B566590.5030804@kernel.org>
Date:	Wed, 20 Jan 2010 11:08:16 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Arjan van de Ven <arjan@...ux.intel.com>
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, Arjan van de Ven <arjan@...radead.org>
Subject: Re: [PATCH 32/40] async: introduce workqueue based alternative implementation

Hello,

On 01/20/2010 09:31 AM, Arjan van de Ven wrote:
> On 1/19/2010 16:19, Tejun Heo wrote:
> 
>> Yeah, you can flush individual works from other works and wqs from
>> works running from different wqs.  What's not allowed is flushing the
>> wq a work is running on from the work.  Let's say if the flush code
>> can be modified to do so, would that change your opinion?
> 
> once you get "run in parallel, but have an API to wait on everyone
> who was scheduled before me"...  ... that'd be fine ;)

Cool, I'll give a shot at it then.  I think it would be better to
adapt the existing interface to the new uses if at all possible.

> but then you pretty much HAVE the cookie API, even if you don't have
> an actual cookie.  (just the cookie was an easy way to determine the
> "before me")

Yeap, but then again, whatever we do, all those synchronization
interfaces can be mapped onto each other eventually.

Thanks.

-- 
tejun
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