linux-kernel - Re: [PATCH 07/19] acpi: use queue_work_on() instead of binding workqueue worker to cpu0

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Date:	Fri, 20 Nov 2009 15:24:20 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	torvalds@...ux-foundation.org, awalls@...ix.net,
	linux-kernel@...r.kernel.org, jeff@...zik.org, mingo@...e.hu,
	jens.axboe@...cle.com, rusty@...tcorp.com.au,
	cl@...ux-foundation.org, dhowells@...hat.com,
	arjan@...ux.intel.com, avi@...hat.com, peterz@...radead.org,
	johannes@...solutions.net
Subject: Re: [PATCH 07/19] acpi: use queue_work_on() instead of binding workqueue
 worker to cpu0

Hello,

11/20/2009 02:09 PM, Andrew Morton wrote:
>> -	kacpid_wq = create_singlethread_workqueue("kacpid");
>> -	bind_workqueue(kacpid_wq);
>> -	kacpi_notify_wq = create_singlethread_workqueue("kacpi_notify");
>> -	bind_workqueue(kacpi_notify_wq);
>> -	kacpi_hotplug_wq = create_singlethread_workqueue("kacpi_hotplug");
>> -	bind_workqueue(kacpi_hotplug_wq);
>> +	kacpid_wq = create_workqueue("kacpid");
>> +	kacpi_notify_wq = create_workqueue("kacpi_notify");
>> +	kacpi_hotplug_wq = create_workqueue("kacpi_hotplug");
> 
> Well that sucks.  We create an additional ((num_possible_cpus()-1)*3)
> kernel threads just because the previous code was "unorthodox"?
> 
> I guess that problem goes away with concurrency-managed workqueues. 
> But please let's not merge this patch without also merging
> concurrency-managed workqueues!

Yeah, it's just prepping the code for the conversion to concurrency
managed workqueues.  I'll put this into linux-next for some time
without full conversion but it will never go upstream without it.

Thanks.

-- 
tejun
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