linux-kernel - Re: workqueue thing

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Message-ID: <4B2F57E6.7020504@linux.intel.com>
Date:	Mon, 21 Dec 2009 12:11:34 +0100
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	Jens Axboe <jens.axboe@...cle.com>
CC:	Andi Kleen <andi@...stfloor.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Tejun Heo <tj@...nel.org>, torvalds@...ux-foundation.org,
	awalls@...ix.net, linux-kernel@...r.kernel.org, jeff@...zik.org,
	mingo@...e.hu, akpm@...ux-foundation.org, rusty@...tcorp.com.au,
	cl@...ux-foundation.org, dhowells@...hat.com, avi@...hat.com,
	johannes@...solutions.net
Subject: Re: workqueue thing

On 12/21/2009 10:17, Jens Axboe wrote:
> On Fri, Dec 18 2009, Arjan van de Ven wrote:
>> in addition, threads are cheap. Linux has no technical problem with
>> running 100's of kernel threads (if not 1000s); they cost basically a
>> task struct and a stack (2 pages) each and that's about it.  making an
>> elaborate-and-thus-fragile design to save a few kernel threads is
>> likely a bad design direction...
>
> One would hope not, since that is by no means outside of what you see on
> boxes today... Thousands. The fact that they are cheap, is not an
> argument against doing it right. Conceptually, I think the concurrency
> managed work queue pool is a much cleaner (and efficient) design.
>

I don't mind a good and clean design; and for sure sharing thread pools into one pool
is really good.
But if I have to choose between a complex "how to deal with deadlocks" algorithm, versus just
running some more threads in the pool, I'll pick the later.

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