linux-kernel - Re: [GIT PULL] RCU changes for v3.3

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Message-ID: <20120124235123.GA32176@opensource.wolfsonmicro.com>
Date:	Tue, 24 Jan 2012 23:51:24 +0000
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	Eric Dumazet <eric.dumazet@...il.com>, Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Fr?d?ric Weisbecker <fweisbec@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [GIT PULL] RCU changes for v3.3

On Tue, Jan 24, 2012 at 02:43:45PM -0800, Paul E. McKenney wrote:
> On Tue, Jan 24, 2012 at 10:07:00PM +0000, Mark Brown wrote:
> > On Tue, Jan 24, 2012 at 01:11:37PM -0800, Paul E. McKenney wrote:

> > > Hmmm...  Residual power dissipation is given in milliwatts.  I could
> > > imagine some heartburn from many of the more aggressive embedded folks,
> > > given that they might prefer microwatts -- or maybe even nanowatts,
> > > for all I know.

> > FWIW idle battery referenced draw from a modern smartphone will be in
> > the low single digit miliwatts or so.

> Ah, OK, so only the non-smart cellphones would care, but they generally
> don't run Linux, from what I understand.  Thanks for the info!

Well, that depends.  Anything you're actually accomplishing when you're
optimising at that level is at the less than a milliwatt level.
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