From: Tejun Heo <tj@kernel.org>
To: Alan Stern <stern@rowland.harvard.edu>
Cc: Lin Ming <ming.m.lin@intel.com>,
linux-kernel@vger.kernel.org, linux-ide@vger.kernel.org,
linux-scsi@vger.kernel.org, linux-pm@vger.kernel.org,
Jeff Garzik <jgarzik@pobox.com>,
"Rafael J. Wysocki" <rjw@sisk.pl>,
James Bottomley <JBottomley@parallels.com>,
Huang Ying <ying.huang@intel.com>,
Zhang Rui <rui.zhang@intel.com>
Subject: Re: [PATCH v2 0/4] ata port runtime power management support
Date: Thu, 10 Nov 2011 07:37:07 -0800 [thread overview]
Message-ID: <20111110153707.GE27258@google.com> (raw)
In-Reply-To: <Pine.LNX.4.44L0.1111101028250.2338-100000@iolanthe.rowland.org>
On Thu, Nov 10, 2011 at 10:30:53AM -0500, Alan Stern wrote:
> Currently, disks will not be runtime-suspended unless (1) the user
> requests it by setting the appropriate power/control attribute, and (2)
> the device file is closed (in particular, the disk has no mounted
> filesystems or swap partitions). I don't imagine this combination of
> events is very common for disks using libata.
Empty ports are pretty common and pm should be able to put the
unoccupied ports and the containing pci device into sleep state which
can save some power. Would be nice to have some numbers tho. But
either way, if this doesn't break anything, I don't see any reason to
object to it - the hierarchy reorg is more of logical cleanup and
runtime pm is trivial afterwards.
Thanks.
--
tejun
prev parent reply other threads:[~2011-11-10 15:37 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-10 6:22 [PATCH v2 0/4] ata port runtime power management support Lin Ming
2011-11-10 6:22 ` [PATCH v2 1/4] ata: make ata port as parent device of scsi host Lin Ming
2011-11-10 6:22 ` [PATCH v2 2/4] scsi: add flag to skip the runtime PM calls on host in EH Lin Ming
2011-11-10 6:22 ` [PATCH v2 3/4] ata: add ata port system PM callbacks Lin Ming
2011-11-10 6:22 ` [PATCH v2 4/4] ata: add ata port runtime " Lin Ming
2011-11-10 15:40 ` Alan Stern
2011-11-10 15:45 ` Tejun Heo
[not found] ` <CAF1ivSZ3rnb90u6LHXfWCBW-6mtfmWYjj1xXfABmm=uNVbomRw@mail.gmail.com>
2011-11-14 5:14 ` Lin Ming
2011-11-14 15:31 ` Alan Stern
2011-11-15 8:51 ` Lin Ming
2011-11-15 14:54 ` Tejun Heo
2011-11-15 16:08 ` Alan Stern
2011-11-16 13:14 ` Lin Ming
2011-11-16 15:42 ` Alan Stern
2011-11-10 15:30 ` [PATCH v2 0/4] ata port runtime power management support Tejun Heo
2011-11-10 15:31 ` Tejun Heo
2011-11-11 2:25 ` Lin Ming
2011-11-10 16:02 ` Kay Sievers
2011-11-11 2:33 ` Lin Ming
2011-11-10 15:30 ` Alan Stern
2011-11-10 15:37 ` Tejun Heo [this message]
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