linux-kernel - Re: [linux-pm] suspend blockers & Android integration

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Date:	Mon, 7 Jun 2010 13:25:53 +0300
From:	Felipe Contreras <felipe.contreras@...il.com>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	Vitaly Wool <vitalywool@...il.com>,
	Brian Swetland <swetland@...gle.com>,
	Arve Hjønnevåg <arve@...roid.com>,
	Arjan van de Ven <arjan@...radead.org>, tytso@....edu,
	Florian Mickler <florian@...kler.org>,
	Peter Zijlstra <peterz@...radead.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	LKML <linux-kernel@...r.kernel.org>, Neil Brown <neilb@...e.de>,
	James Bottomley <James.Bottomley@...e.de>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Linux PM <linux-pm@...ts.linux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Felipe Balbi <felipe.balbi@...ia.com>
Subject: Re: [linux-pm] suspend blockers & Android integration

2010/6/6 Matthew Garrett <mjg59@...f.ucam.org>:
> On Sun, Jun 06, 2010 at 07:21:49PM +0200, Vitaly Wool wrote:
>> 2010/6/6 Matthew Garrett <mjg59@...f.ucam.org>:
>>
>> > Suspend blocks prevent system suspend, not any per-device suspend.
>>
>> Can you suspend a device which is holding a wake lock?
>
> Yes. Suspend blocks are orthogonal to runtime PM.

In that sense yes, but as it has been stated before; if Android
user-space concentrates on getting suspend blockers right, then the
timers in user-space will not be aligned correctly, and runtime PM
wouldn't work that great. Moreover, opportunistic suspend takes the
device out of idle. So, as runtime PM gets better, there's a point
where opportunistic suspend makes the situation worst.

So they are _mostly_ orthogonal, but not completely, at least for the
analysis of suspend blockers' usefulness.

-- 
Felipe Contreras
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