linux-kernel - Re: [PATCH 06/19] acpi: use queue_work_on() instead of binding workqueue worker to cpu0

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Message-ID: <9997.1254401851@redhat.com>
Date:	Thu, 01 Oct 2009 13:57:31 +0100
From:	David Howells <dhowells@...hat.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	dhowells@...hat.com, jeff@...zik.org, mingo@...e.hu,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	jens.axboe@...cle.com, rusty@...tcorp.com.au,
	cl@...ux-foundation.org, arjan@...ux.intel.com
Subject: Re: [PATCH 06/19] acpi: use queue_work_on() instead of binding workqueue worker to cpu0

Tejun Heo <tj@...nel.org> 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");

Doesn't that then create one worker thread per CPU and then eschew all but
those attached to CPU 0?  Sounds excessive, but presumably you deal with that
in later patches.

David
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