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Date: Mon, 7 Jun 2010 13:25:53 +0300
Message-ID: <AANLkTinajoKfVD3eBNspiuf1e5jFb2jm-OyHJbcbk4xo@mail.gmail.com>
Subject: Re: [linux-pm] suspend blockers & Android integration
From: Felipe Contreras <felipe.contreras@gmail.com>
To: Matthew Garrett <mjg59@srcf.ucam.org>
Cc: Vitaly Wool <vitalywool@gmail.com>, Brian Swetland <swetland@google.com>,
       =?UTF-8?B?QXJ2ZSBIasO4bm5ldsOlZw==?= <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 07:21:49PM +0200, Vitaly Wool wrote:
>> 2010/6/6 Matthew Garrett <mjg59@srcf.ucam.org>:
>>
>> > Suspend blocks prevent system suspend, not any per-device suspend.
>>
>> Can you suspend a device which is holding a wake lock?
>
> Yes. Suspend blocks are orthogonal to runtime PM.

In that sense yes, but as it has been stated before; if Android
user-space concentrates on getting suspend blockers right, then the
timers in user-space will not be aligned correctly, and runtime PM
wouldn't work that great. Moreover, opportunistic suspend takes the
device out of idle. So, as runtime PM gets better, there's a point
where opportunistic suspend makes the situation worst.

So they are _mostly_ orthogonal, but not completely, at least for the
analysis of suspend blockers' usefulness.

-- 
Felipe Contreras
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