linux-kernel - Re: [PATCH 0/3] ata port runtime power management support

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Message-ID: <20111102151711.GB12543@dhcp-172-17-108-109.mtv.corp.google.com>
Date:	Wed, 2 Nov 2011 08:17:11 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Lin Ming <ming.m.lin@...el.com>
Cc:	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org,
	linux-scsi@...r.kernel.org, linux-pm@...r.kernel.org,
	Alan Stern <stern@...land.harvard.edu>,
	Jeff Garzik <jgarzik@...ox.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	James Bottomley <JBottomley@...allels.com>,
	Huang Ying <ying.huang@...el.com>,
	Zhang Rui <rui.zhang@...el.com>
Subject: Re: [PATCH 0/3] ata port runtime power management support

Hello,

On Wed, Nov 02, 2011 at 02:21:37PM +0800, Lin Ming wrote:
> These 3 patches add ata port runtime pm support, which is done through scsi layer.
> scsi host runtime pm mechanism is already there(scsi_pm.c).
> These patches add hooks for ata port.
> 
> Lin Ming (3):
>       scsi: fix potential dead lock for host runtime pm
>       scsi: add hooks for host runtime power management
>       ata: implement ata port runtime pm hooks

Hmmm.... Some questions.

* How much does this add on top of hardware timed auto spindown and
  dynamic link power management?

* Do the added benefits justify yet another runtime powersaving
  mechanism?

* Any way we can tie the other stuff with overall runtime PM?

Thanks.

-- 
tejun
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