Re: Question about DEC Alpha memory ordering
From: Paul E. McKenney
Date: Mon Feb 13 2017 - 15:32:05 EST
On Tue, Feb 14, 2017 at 08:23:34AM +1300, Michael Cree wrote:
> Hi Paul,
> On Mon, Feb 13, 2017 at 11:09:31AM -0800, Paul E. McKenney wrote:
> > On Mon, Feb 13, 2017 at 01:53:27PM -0500, bob smith wrote:
> > > On 2/13/17 1:39 PM, Paul E. McKenney wrote:
> > > > can real DEC Alpha hardware end up with both instances of "r1"
> > > > having the value 1?
> > >
> > > I thought this question reminded me of something, so I found this:
> > > > https://www.kernel.org/doc/Documentation/memory-barriers.txt
> > >
> > > and I pasted in the content - David Howells is one of the authors and
> > > maybe that is why the question sort of reminded me.
> > >
> > > Maybe someone has an update but this is what was said then.
> > Well, thank you for pointing me to this, but my question was intended to
> > check whether or not the words I helped to write in memory-barriers.txt
> > are in fact accurate. So if you have an SMP DEC Alpha system that you
> > could provide remote access to, that would be very helpful!
> I'm that guy with an SMP Alpha system who met you at Linux Conference
> Australia after your talk on memory barriers. I meant to get back to
> you but tracking down a kernel bug and now a binutils/glibc bug has
> got the better of my time.
> Feel free to email me personally to arrange remote access to an SMP
> Alpha system, preferrably with a GPG signed message.
Would you be willing to extend this offer to Andrea Parri (CCed)?
He is the one who has run such tests in the past.
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