linux-kernel - Re: [PATCH 0/8] Suspend block api (version 6)

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Date:	Tue, 11 May 2010 09:36:33 -0700
From:	Tony Lindgren <tony@...mide.com>
To:	Matthew Garrett <mjg@...hat.com>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Kevin Hilman <khilman@...prootsystems.com>,
	Arve Hjønnevåg <arve@...roid.com>,
	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	Alan Stern <stern@...land.harvard.edu>,
	Tejun Heo <tj@...nel.org>, Oleg Nesterov <oleg@...hat.com>,
	Paul Walmsley <paul@...an.com>, magnus.damm@...il.com,
	mark gross <mgross@...ux.intel.com>,
	Arjan van de Ven <arjan@...radead.org>,
	Geoff Smith <geoffx.smith@...el.com>,
	Brian Swetland <swetland@...gle.com>
Subject: Re: [PATCH 0/8] Suspend block api (version 6)

* Matthew Garrett <mjg@...hat.com> [100511 09:10]:
> On Tue, May 11, 2010 at 09:12:28AM -0700, Tony Lindgren wrote:
> 
> > To me it sounds like this should only be allowed to happen when you do:
> > 
> > # echo 1 > /sys/power/suspend_while_idle
> > 
> > As it kills the timers and leads to non-standard behaviour of the apps
> > as they won't run :)
> > 
> > And then the remaining question is how to make sure the use cases
> > below can be handled in a clean way.
> 
> That's handled by the /sys/power/policy opportunistic/forced switch.

OK, so can the suspend blocker then become just:

# Block suspend while idle, system stays running
# echo default > /sys/power/policy

and the when it's OK to suspend:

# Allow suspend while idle, system suspends when it hits kernel idle loop
# echo opportunistic > /sys/power/policy

or do you still need something more to ensure the data gets into your
app and be handled?

The part I really don't like is the idea of patching all over the drivers
and userspace for the wakelocks/suspendblocks.

Regards,

Tony
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