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

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Date:	Sun, 6 Jun 2010 12:49:49 +0200
From:	Florian Mickler <florian@...kler.org>
To:	Vitaly Wool <vitalywool@...il.com>
Cc:	david@...g.hm, Brian Swetland <swetland@...gle.com>,
	Arve Hjønnevåg <arve@...roid.com>,
	Arjan van de Ven <arjan@...radead.org>, tytso@....edu,
	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

On Sun, 6 Jun 2010 12:19:08 +0200
Vitaly Wool <vitalywool@...il.com> wrote:

> 2010/6/6  <david@...g.hm>:
> 
> > as an example (taken from this thread).
> >
> > system A needs to wake up to get a battery reading, store it and go back to
> > sleep, It does so every 10 seconds. But when it does so it only runs the one
> > process and then goes back to sleep.
> >
> > system B has the same need, but wakes up every 10 minutes. but when it does
> > so it fully wakes up and this allows the mail app to power up the radio,
> > connect to the Internet and start checking for new mail before oppurtunistic
> > sleep shuts things down (causing the mail check to fail)
> >
> > System A will last considerably longer on a battery than System B.
> 
> Exactly, thanks for pointing out the specific example :)
> 
> ~Vitaly

This does not affect suspend_blockers nor does suspend_blockers
interfere with that. 

Suspend_blockers allow the system to suspend ("mem">/sys/power/state
suspend), when the userspace decides that the device is not in use.

So implementing suspend_blockers support does not impact any
optimizations done to either system A nor system B.

Cheers,
Flo
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