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Date: Sun, 6 Jun 2010 17:26:09 +0200
Message-ID: <AANLkTimXTgZS_fZQa8hjIptJrCn756gF_xakT1IQiLWa@mail.gmail.com>
Subject: Re: [linux-pm] suspend blockers & Android integration
From: Vitaly Wool <vitalywool@gmail.com>
To: Matthew Garrett <mjg59@srcf.ucam.org>
Cc: Brian Swetland <swetland@google.com>,
       =?ISO-8859-1?Q?Arve_Hj=F8nnev=E5g?= <arve@android.com>,
       Arjan van de Ven <arjan@infradead.org>, tytso@mit.edu,
       Florian Mickler <florian@mickler.org>,
       Peter Zijlstra <peterz@infradead.org>, "H. Peter Anvin" <hpa@zytor.com>,
       LKML <linux-kernel@vger.kernel.org>, Neil Brown <neilb@suse.de>,
       James Bottomley <James.Bottomley@suse.de>,
       Alan Cox <alan@lxorguk.ukuu.org.uk>,
       Linux PM <linux-pm@lists.linux-foundation.org>,
       Ingo Molnar <mingo@elte.hu>,
       Linux OMAP Mailing List <linux-omap@vger.kernel.org>,
       Linus Torvalds <torvalds@linux-foundation.org>,
       Thomas Gleixner <tglx@linutronix.de>,
       Felipe Balbi <felipe.balbi@nokia.com>
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2010/6/6 Matthew Garrett <mjg59@srcf.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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