linux-kernel - Re: workqueue thing

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Message-ID: <4B2F768C.1040704@kernel.org>
Date:	Mon, 21 Dec 2009 22:22:20 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Arjan van de Ven <arjan@...ux.intel.com>
CC:	Jens Axboe <jens.axboe@...cle.com>,
	Andi Kleen <andi@...stfloor.org>,
	Peter Zijlstra <peterz@...radead.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

Hello,

On 12/21/2009 08:11 PM, Arjan van de Ven wrote:
> 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.

The deadlock avoidance algorithm is pretty simple.  It creates a new
worker when everything is blocked.  If the attempt to create a new
worker blocks, it calls in dedicated workers to ensure allocation path
is not blocked.  It's not that complex.

Thanks.

-- 
tejun
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