linux-kernel - Re: workqueue thing

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Message-ID: <4B31D487.6060706@kernel.org>
Date:	Wed, 23 Dec 2009 17:27:51 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Linus Torvalds <torvalds@...ux-foundation.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

Hello,

On 12/23/2009 05:01 PM, Ingo Molnar wrote:
> At least as far as i'm concerned, i'd like to see actual uses. It's a big 
> linecount increase all things considered:
> 
>    20 files changed, 2783 insertions(+), 660 deletions(-)
> 
> and you say it _wont_ help performance/scalability (this aspect
> wasnt clear to me from previous discussions),

I'm just not sure how it would turn out.  I guess it would be an
overall win under loaded situations due to lowered cache footprint but
I don't think it will be anything which would stand out.

> so the (yet to be seen) complexity reduction in other code ought to
> be worth it.

Sure, fair enough but there's also a different side.  It'll allow much
easier implementation of things like in-kernel media presence polling
(I have some code for this but it's still just forming) and
per-device.  It gives a much easier tool to extract concurrency and
thus opens up new possibilities.

So, anyways, alright, I'll go try some conversions.

Happy holidays.

-- 
tejun
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