linux-kernel - Re: [linux-pm] [PATCH 1/8] PM: Add suspend block api.

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Date:	Fri, 7 May 2010 15:00:26 -0700
From:	Tony Lindgren <tony@...mide.com>
To:	Matthew Garrett <mjg@...hat.com>
Cc:	Daniel Walker <dwalker@...o99.com>,
	Brian Swetland <swetland@...gle.com>,
	Alan Stern <stern@...land.harvard.edu>,
	mark gross <mgross@...ux.intel.com>, markgross@...gnar.org,
	Len Brown <len.brown@...el.com>, linux-doc@...r.kernel.org,
	Kernel development list <linux-kernel@...r.kernel.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Oleg Nesterov <oleg@...hat.com>, Tejun Heo <tj@...nel.org>,
	Linux-pm mailing list <linux-pm@...ts.linux-foundation.org>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [linux-pm] [PATCH 1/8] PM: Add suspend block api.

* Matthew Garrett <mjg@...hat.com> [100507 14:44]:
> On Fri, May 07, 2010 at 02:42:11PM -0700, Tony Lindgren wrote:
> > * Matthew Garrett <mjg@...hat.com> [100507 14:34]:
> > > How do you know to wake the process up in response to the keypress?
> > 
> > Does it matter for processes that are not "certified"? Maybe you
> > could assume that you can keep it stopped until the screen is on
> > again, or some other policy.
> 
> Yes, it matters. You don't necessarily know whether to turn the screen 
> on until the app has had an opportunity to process the event. This is 
> exactly the kind of use case that suspend blocks are intended to allow, 
> so alternatives that don't permit that kind of use case aren't really 
> adequate alternatives.

Hmm, I'm thinking there would not be any need to turn the screen on
for the broken apps until some other event such as a tap on the screen
triggers the need to turn the screen on.

If it's a critical app, then it should be fixed so it's safe to keep
running.

And yeah, I guess you could cgroups to categorize "timer certified"
and "broken" apps.

Regards,

Tony
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