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

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Date:	Thu, 27 May 2010 16:43:57 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Arve Hjønnevåg <arve@...roid.com>,
	Florian Mickler <florian@...kler.org>,
	Vitaly Wool <vitalywool@...il.com>,
	LKML <linux-kernel@...r.kernel.org>, felipe.balbi@...ia.com,
	Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
	Linux PM <linux-pm@...ts.linux-foundation.org>
Subject: Re: [linux-pm] [PATCH 0/8] Suspend block api (version 8)

On Thu, 2010-05-27 at 16:41 +0200, Peter Zijlstra wrote:
> 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.

Provide incentive for Joe Clicker to improve his app, instead of cope
with the shit he created.
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