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Date: Sun, 6 Jun 2010 17:26:09 +0200
From: Vitaly Wool <vitalywool@...il.com>
To: Matthew Garrett <mjg59@...f.ucam.org>
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
2010/6/6 Matthew Garrett <mjg59@...f.ucam.org>:
> 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.
Yeah, that might also be the case, But then again, what's the use of
suspend blockers in this situation?
~Vitaly
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