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

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Message-ID: <20120314130801.GA11722@sgi.com>
Date:	Wed, 14 Mar 2012 08:08:01 -0500
From:	Dimitri Sivanich <sivanich@....com>
To:	Mike Galbraith <efault@....de>
Cc:	paulmck@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC] rcu: Limit GP initialization to CPUs that have
 been online

On Wed, Mar 14, 2012 at 01:40:41PM +0100, Mike Galbraith wrote:
> On Wed, 2012-03-14 at 10:24 +0100, Mike Galbraith wrote: 
> > On Tue, 2012-03-13 at 17:24 -0700, Paul E. McKenney wrote: 
> > > The following builds, but is only very lightly tested.  Probably full
> > > of bug, especially when exercising CPU hotplug.
> > 
> > You didn't say RFT, but...
> > 
> > To beat on this in a rotund 3.0 kernel, the equivalent patch would be
> > the below?  My box may well answer that before you can.. hope not ;-)
> 
> (Darn, it did.  Box says boot stall with virgin patch in tip too though.
> Wedging it straight into 3.0 was perhaps a tad premature;)

I saw the same thing with 3.3.0-rc7+ and virgin patch on UV.  Boots fine without the patch.
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