linux-kernel - Re: [patch 2a/3] Expose Power Management Policy option to users

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Date:	Wed, 13 Jun 2007 16:48:03 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	James Bottomley <James.Bottomley@...elEye.com>
CC:	Kristen Carlson Accardi <kristen.c.accardi@...el.com>,
	linux-ide@...r.kernel.org, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org, htejun@...il.com
Subject: Re: [patch 2a/3] Expose Power Management Policy option to users

James Bottomley wrote:
> To take the model I understand: SAS; the links are managed at the phy
> level, so the power policy should be set there and thus should probably
> be a property of the phy object, which doesn't even exist in the SCSI
> model, it only exists in the transport class.  It strikes me that even
> for ATA, the same thing is probably true.
> 
> Now, I can see that the power management models of all the transports
> might share some similarities (particularly at this three stage granular
> level); if so, it might make sense to export helpers from the mid-layer
> for the transport classes to use for this.


Agreed, in principle.

	Jeff


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