linux-kernel - Re: [PATCH 34/35] async: use workqueue for worker pool

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Message-ID: <4C2A176F.1090101@kernel.org>
Date:	Tue, 29 Jun 2010 17:55:27 +0200
From:	Tejun Heo <tj@...nel.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
CC:	torvalds@...ux-foundation.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, oleg@...hat.com, axboe@...nel.dk,
	dwalker@...eaurora.org, stefanr@...6.in-berlin.de,
	florian@...kler.org, andi@...stfloor.org, mst@...hat.com,
	randy.dunlap@...cle.com, Arjan van de Ven <arjan@...radead.org>
Subject: Re: [PATCH 34/35] async: use workqueue for worker pool

Hello,

On 06/29/2010 05:52 PM, Frederic Weisbecker wrote:
>>> If there is a question of slow ports to probe, then cmwq wouldn't seem the
>>> right thing here, as it only forks when we go to sleep.
>>
>> I lost you here.  If something during boot has to burn cpu cycles
>> (which it shouldn't, really), it has to burn cpu cycles and having
>> multiple concurent threads won't help anything.
> 
> It would on SMP.

Oh, I see.  Parallel cpu hogs.  We don't have such users for async and
I think using padata would be the right solution for those situations.

Thanks.

-- 
tejun
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