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

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Date:	Sun, 6 Jun 2010 17:43:26 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Vitaly Wool <vitalywool@...il.com>
Cc:	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

On Sun, Jun 06, 2010 at 05:47:10PM +0200, Vitaly Wool wrote:
> 2010/6/6 Matthew Garrett <mjg59@...f.ucam.org>:
> > The difference between idle-based suspend and opportunistic suspend is
> > that the former will continue to wake up for timers and will never be
> > entered if something is using CPU, whereas the latter will be entered
> > whenever no suspend blocks are held. The problem with opportunistic
> > suspend is that you might make the decision to suspend simultaneusly
> > with a wakeup event being received. Suspend blocks facilitate
> > synchronisation between the kernel and userspace to ensure that all such
> > events have been consumed and handld appropriately.
> 
> Right, and then you start taking suspend blockers in kernel here and
> there which eventually interferes with runtime PM.

Suspend blocks prevent system suspend, not any per-device suspend.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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