linux-kernel - Re: [PATCH] a local-timer-free version of RCU

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Message-ID: <20101113223046.GB5445@nowhere>
Date:	Sat, 13 Nov 2010 23:30:49 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Joe Korty <joe.korty@...r.com>, mathieu.desnoyers@...icios.com,
	dhowells@...hat.com, loic.minier@...aro.org,
	dhaval.giani@...il.com, tglx@...utronix.de,
	linux-kernel@...r.kernel.org, josh@...htriplett.org,
	houston.jim@...cast.net
Subject: Re: [PATCH] a local-timer-free version of RCU

On Wed, Nov 10, 2010 at 08:19:20PM -0800, Paul E. McKenney wrote:
> On Wed, Nov 10, 2010 at 06:31:11PM +0100, Peter Zijlstra wrote:
> > On Wed, 2010-11-10 at 16:54 +0100, Frederic Weisbecker wrote:
> > > run the sched tick and if there was nothing to do
> > > for some time and we are in userspace, deactivate it. 
> > 
> > Not for some time, immediately, have the tick track if it was useful, if
> > it was not, have it stop itself, like:
> > 
> > tick()
> > {
> >  int stop = 1;
> > 
> >  if (nr_running > 1)
> >   stop = 0;
> > 
> >  if(rcu_needs_cpu())
> >   stop = 0;
> > 
> >  ...
> > 
> > 
> >  if (stop)
> >   enter_nohz_mode();
> > }
> 
> I am still holding out for a dyntick-hpc version of RCU that does not
> need the tick.  ;-)


So you don't think it would be an appropriate solution? Keeping the tick for short
periods of time while we need it only, that looks quite a good way to try.

Hmm?

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