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

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Message-ID: <20120315170236.GF2381@linux.vnet.ibm.com>
Date:	Thu, 15 Mar 2012 10:02:36 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Mike Galbraith <efault@....de>
Cc:	Dimitri Sivanich <sivanich@....com>, 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 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.

							Thanx, Paul

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