Re: [linux-pm] [PATCH 0/8] Suspend block api (version 8)

[Peter Zijlstra]

On Thu, 2010-05-27 at 15:35 +0100, Matthew Garrett wrote:
> On Thu, May 27, 2010 at 04:28:51PM +0200, Peter Zijlstra wrote:
> > On Thu, 2010-05-27 at 15:06 +0100, Matthew Garrett wrote:
> > > one way which indicates to the scheduler that tasks in TASK_RUNNING 
> > > should be scheduled, and when the session is idle we set the flag the 
> > > other way and all processes in that cgroup get shifted to 
> > > TASK_INTERRUPTIBLE or something.
> > 
> > What's wrong with simply making the phone beep loudly and displaying:
> > bouncing cows is preventing your phone from sleeping!
> 
> Well, primarily that it's possible to design an implementation where it 
> *doesn't* prevent your phone froms sleeping, but also because a given 
> application may justifiably be preventing your phone from sleeping for a 
> short while. What threshold do you use to determine the difference?

Whatever you want, why would the kernel care?

You can create a whole resource management layer in userspace, with
different privilidge/trust levels. Trusted apps may wake more than
untrusted apps. Who cares.

The thing is, you can easily detect what keeps your cpu from idling.
What you do about it a pure userspace solution.

You can use the QoS stuff to give hints, like don't wake me more than 5
times a minute, if with those hints an app still doesn't meet whatever
criteria are suitable for the current mode, yell at it. Or adjust its
QoS parameters for it.

Heck, for all I care, simply SIGKILL the thing and report it once the
user starts looking at his screen again.
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