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

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Message-ID: <Pine.LNX.4.44L0.1006101043510.1702-100000@iolanthe.rowland.org>
Date:	Thu, 10 Jun 2010 10:47:31 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
cc:	Neil Brown <neilb@...e.de>,
	Felipe Contreras <felipe.contreras@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	<david@...g.hm>, Florian Mickler <florian@...kler.org>,
	Vitaly Wool <vitalywool@...il.com>,
	Brian Swetland <swetland@...gle.com>,
	Arve Hjønnevåg <arve@...roid.com>,
	Arjan van de Ven <arjan@...radead.org>, <tytso@....edu>,
	Peter Zijlstra <peterz@...radead.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	LKML <linux-kernel@...r.kernel.org>,
	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>,
	Thomas Gleixner <tglx@...utronix.de>,
	Felipe Balbi <felipe.balbi@...ia.com>
Subject: Re: [linux-pm] suspend blockers & Android integration

On Thu, 10 Jun 2010, Rafael J. Wysocki wrote:

> Moreover, having thought a bit more about the "power manager in user space"
> concept I'm not sure if it really is that better than the original wakelocks
> idea.  Namely, it only repaces a kernel-based mechanism with a user space
> task doing basically the same thing, but the communication between that task
> and the other cooperating user space tasks is arguably more complicated (it
> also uses the kernel resources, although indirectly).

That is all true.  The "power manager in userspace" was meant to prove
a point: that this _could_ be done without invasive changes to the
kernel.  It wasn't necessarily meant to be a _better_ solution.

> So, for a phone-like system, where you'd generally want to simplify user space,
> having a "power manager" in the kernel seems to make sense to me.

This is a judgment call.  Obviously different people have different 
opinions.

Alan Stern

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