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

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Message-ID: <20100606133130.GA8513@srcf.ucam.org>
Date:	Sun, 6 Jun 2010 14:31:30 +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 12:00:47PM +0200, Vitaly Wool wrote:

> Sure, but my point was, some non-trivial (still kind of natural for a
> smartphone) activities with the device will prevent it from suspending
> for quite some time. Even worse, the suspend wakelock will keep the
> whole kernel active, as opposed to powering off unused devices
> separately as it's done in runtime PM. Yep, I know about the "early
> suspend" type of thing; yet it's excess, not mainlined and lacks
> granularity.

Holding a suspend blocker is entirely orthogonal to runtime pm. The 
"whole kernel" will not be "active" - it can continue to hit the same 
low power state in the idle loop, and any runtime pm implementation in 
the drivers will continue to be active.

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