From: "Rafael J. Wysocki" <rjw@sisk.pl>
Organization: SiSK
To: Alan Stern <stern@rowland.harvard.edu>
Subject: Re: [linux-pm] suspend blockers & Android integration
Date: Thu, 10 Jun 2010 17:44:55 +0200
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Cc: Neil Brown <neilb@suse.de>, Felipe Contreras <felipe.contreras@gmail.com>,
       Andrew Morton <akpm@linux-foundation.org>,
       Linus Torvalds <torvalds@linux-foundation.org>, david@lang.hm,
       Florian Mickler <florian@mickler.org>,
       Vitaly Wool <vitalywool@gmail.com>,
       Brian Swetland <swetland@google.com>,
       Arve =?iso-8859-1?q?Hj=F8nnev=E5g?= <arve@android.com>,
       Arjan van de Ven <arjan@infradead.org>, tytso@mit.edu,
       Peter Zijlstra <peterz@infradead.org>, "H. Peter Anvin" <hpa@zytor.com>,
       LKML <linux-kernel@vger.kernel.org>,
       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>,
       Thomas Gleixner <tglx@linutronix.de>,
       Felipe Balbi <felipe.balbi@nokia.com>
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On Thursday, June 10, 2010, Alan Stern wrote:
> 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.

Agreed.

Rafael
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