Re: [PATCH tip/core/rcu 13/22] rcu: Fix grace-period hangs due to race with CPU offline

[Peter Zijlstra]

On Tue, Jun 26, 2018 at 11:19:37AM -0700, Paul E. McKenney wrote:
> The initial reason for ____cacheline_internodealigned_in_smp was that
> some of the fields can be accessed by random CPUs, while others are
> used more locally, give or take our usual contention over the handling
> of CPU numbers.  ;-)

So that whole internode thing only matters for the insane VSMP case,
where they take node to mean a cluster node, not a numa node.

VSMP is a networked shared memory machine where, by necessity, the MESI
protocol operates on page granularity.

In general I tend to completely and utterly ignore that and let the VSMP
people worry about things.