Messages in this thread | | | Date | Mon, 11 Jun 2007 16:00:29 -0400 | From | Jeff Garzik <> | Subject | Re: [patch 2/3] Expose Power Management Policy option to users |
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Kristen Carlson Accardi wrote: > This patch will modify the scsi and ata subsystem to allow > users to set a power management policy for the link. > libata drivers can define a function (enable_pm) that will > perform hardware specific actions to enable whatever power > management policy the user sets up if the driver supports > it. This power management policy will be activated after > all disks have been enumerated and intialized. > > The scsi subsystem will create a new sysfs file for each > host in /sys/class/scsi_host called "link_power_management_policy". > This file can have 3 possible values: > > Value Meaning > ------------------------------------------------------------------- > min_power User wishes the link to conserve power as much as > possible, even at the cost of some performance > > max_performance User wants priority to be on performance, not power > savings > > medium_power User wants power savings, with less performance cost > than min_power (but less power savings as well). > > > Signed-off-by: Kristen Carlson Accardi <kristen.c.accardi@intel.com>
seems OK at first glance, though I request that ata and scsi portions be split into separate patches
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