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SubjectRe: [PATCH RFC] rcu: Limit GP initialization to CPUs that have been online
On Thu, Mar 15, 2012 at 12:58:57PM -0500, Dimitri Sivanich wrote:
> On Wed, Mar 14, 2012 at 09:56:57AM -0700, Paul E. McKenney wrote:
> > On Wed, Mar 14, 2012 at 08:17:17AM -0700, Paul E. McKenney wrote:
> > > On Wed, Mar 14, 2012 at 08:08:01AM -0500, Dimitri Sivanich wrote:
> > > > 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.
> > >
> > > Right... Bozo here forgot to set the kernel parameters for large-system
> > > emulation during testing. Apologies for the busted patch, will fix.
> > >
> > > And thank you both for the testing!!!
> > >
> > > Hey, at least I labeled it "RFC". ;-)
> >
> > Does the following work better? It does pass my fake-big-system tests
> > (more testing in the works).
>
> This one stalls for me at the same place the other one did. Once again,
> if I remove the patch and rebuild, it boots just fine.
>
> Is there some debug/trace information that you would like me to provide?

Very strange.

Could you please send your dmesg and .config?

Thanx, Paul



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