linux-kernel - Re: Overview of concurrency managed workqueue

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Message-ID: <4C1C8B32.1040007@kernel.org>
Date:	Sat, 19 Jun 2010 11:17:38 +0200
From:	Tejun Heo <tj@...nel.org>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Andy Walls <awalls@...metrocast.net>,
	Daniel Walker <dwalker@...eaurora.org>, mingo@...e.hu,
	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: Overview of concurrency managed workqueue

Hello,

On 06/19/2010 11:15 AM, Andi Kleen wrote:
>> Well, in general, queueing to execution latency should be fairly low
>> especially if it's put at the front of the queue but well it's nothing
>> with any kind of guarantee.
> 
> This is not a hard real time situation with a hard deadline,
> just "ASAP"
> 
>> I'm currently writing a kthread wrapper which basically provides
>> similar interface to wq but guarantees binding to a specific thread
>> which can be RT of course.  If single threadedness is acceptable, I
>> think this would render better behavior.  What do you think?
> 
> I think I would prefer simply high priority, but normal work item.
> 
> Otherwise we have the thread hanging around all the time 
> and on a large system it's still only a single one, so
> it'll never scale.

Hmmm... yeah, adding it isn't hard.  I'm just a bit skeptical how
useful it would be.  Having only single user would be a bit silly.
Can you think of anything else which could benefit from high priority
queueing?

Thanks.

-- 
tejun
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