linux-kernel - Re: Run-time PM idea (was: Re: [linux-pm] [RFC][PATCH 0/2] PM: Rearrange core suspend code)

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Message-ID: <2c0942db0906080929r31e39fe5w673ed877bb5f4966@mail.gmail.com>
Date:	Mon, 8 Jun 2009 09:29:34 -0700
From:	Ray Lee <ray-lk@...rabbit.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Matthew Garrett <mjg59@...f.ucam.org>,
	Oliver Neukum <oliver@...kum.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Alan Stern <stern@...land.harvard.edu>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Magnus Damm <magnus.damm@...il.com>
Subject: Re: Run-time PM idea (was: Re: [linux-pm] [RFC][PATCH 0/2] PM: 
	Rearrange core suspend code)

On Mon, Jun 8, 2009 at 8:06 AM, Ingo Molnar<mingo@...e.hu> wrote:
>
> * Matthew Garrett <mjg59@...f.ucam.org> wrote:

>> I'd like the kernel to expose this functionality but leave the
>> policy decisions to userland.
>
> The thing is, suspending something that is being used and relied on
> by an app is a _bug_. This is rather fundamental: hardware state and
> usage tracking is _NOT POLICY_.

Yes. But, actual example time: what about the case where completely
turning off a laptop's DVD drive saves extra power, but then also
turns off kernel and userspace notification of a disc being inserted?

One of the Other OS's handles this by having a popup when the battery
gets low, asking if it's okay to turn the drive off. This is part of
what Matthew is talking about here.
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