linux-kernel - Re: [PATCH RFC nohz_full v2 2/7] nohz_full: Add rcu_dyntick data for scalable detection of all-idle state

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Date:	Mon, 1 Jul 2013 22:58:39 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Mike Galbraith <bitbucket@...ine.de>
Cc:	Josh Triplett <josh@...htriplett.org>,
	linux-kernel@...r.kernel.org, mingo@...e.hu, laijs@...fujitsu.com,
	dipankar@...ibm.com, akpm@...ux-foundation.org,
	mathieu.desnoyers@...ymtl.ca, niv@...ibm.com, tglx@...utronix.de,
	peterz@...radead.org, rostedt@...dmis.org, dhowells@...hat.com,
	edumazet@...gle.com, darren@...art.com, fweisbec@...il.com,
	sbw@....edu
Subject: Re: [PATCH RFC nohz_full v2 2/7] nohz_full: Add rcu_dyntick data for
 scalable detection of all-idle state

On Tue, Jul 02, 2013 at 07:10:52AM +0200, Mike Galbraith wrote:
> On Mon, 2013-07-01 at 12:16 -0700, Paul E. McKenney wrote: 
> > On Mon, Jul 01, 2013 at 11:34:13AM -0700, Josh Triplett wrote:
> 
> > > > > This also naturally raises the question "How can we let userspace get
> > > > > accurate time without forcing a timer tick?".
> > > > 
> > > > We don't.  ;-)
> > > 
> > > We don't currently, hence my question about how we can. :)
> > 
> > Per-CPU atomic clocks?
> 
> Great idea, who needs timekeeping code. 
> 
> http://www.euronews.com/2013/04/02/swiss-sets-sights-on-miniscule-atomic-clock/

"in theory you’ll only need to set it once every 3,000 years, providing
of course your battery lasts that long" ;-) ;-) ;-)

							Thanx, Paul

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