linux-kernel - Re: [linux-pm] RFC: /sys/power/policy

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Message-id: <alpine.LFD.2.00.1006171500260.4214@localhost.localdomain>
Date:	Thu, 17 Jun 2010 15:02:03 -0400 (EDT)
From:	Len Brown <lenb@...nel.org>
To:	Victor Lowther <victor.lowther@...il.com>
Cc:	Linux Power Management List <linux-pm@...ts.osdl.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>
Subject: Re: [linux-pm] RFC: /sys/power/policy_preference


> On Jun 16, 2010, at 4:05 PM, Len Brown <lenb@...nel.org> wrote:
> 
> > Create /sys/power/policy_preference, giving user-space
> > the ability to express its preference for kernel based
> > power vs. performance decisions in a single place.
> > 
> > This gives kernel sub-systems and drivers a central place
> > to discover this system-wide policy preference.
> > It also allows user-space to not have to be updated
> > every time a sub-system or driver adds a new power/perf knob.
> 
> I would prefer documenting all the current knobs and adding them to pm-utils
> so that pm-powersave knows about and can manage them. Once that is done,
> creating arbitrary powersave levels should be fairly simple.


The idea here is to not require user-space to need updating
whenever a future knob is invented.  We can do a great job
at documenting the past, but a poor job of documenting the future:-)

cheers,
Len Brown, Intel Open Source Technolgy Center
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