linux-kernel - Re: [PATCH RFC] rcu: Limit GP initialization to CPUs that have been online

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Date:	Thu, 15 Mar 2012 12:21:19 -0500
From:	Dimitri Sivanich <sivanich@....com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	Mike Galbraith <efault@....de>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC] rcu: Limit GP initialization to CPUs that have
 been online

On Thu, Mar 15, 2012 at 10:02:36AM -0700, Paul E. McKenney wrote:
> On Thu, Mar 15, 2012 at 04:07:11AM +0100, Mike Galbraith wrote:
> > On Thu, 2012-03-15 at 03:42 +0100, Mike Galbraith wrote: 
> > > On Wed, 2012-03-14 at 09:56 -0700, Paul E. McKenney wrote:
> > > 
> > > > Does the following work better?  It does pass my fake-big-system tests
> > > > (more testing in the works).
> > > 
> > > Yup, tip booted fine.  Thanks!  I'll test, see if it gets upset.
> > 
> > Wedged into 3.0 enterprise booted fine too, is now running rcutorture.
> > I'll add hotplug after it runs explosion free for a while.  Any
> > suggestions for giving both virgin and 3.0 a thorough trouncing?
> 
> It would be good to check the latency of RCU's grace-period
> initialization, and comparing the results with and without this patch.
> Dimitri might have scripting for that.
> 

I'll attempt to get that tested yet this week.
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