Re: [PATCH v2 rcu 04/18] rcu: Weaken ->dynticks accesses and updates

[Paul E. McKenney]

On Wed, Jul 28, 2021 at 01:37:19PM -0700, Josh Triplett wrote:
> On Wed, Jul 28, 2021 at 10:37:15AM -0700, Paul E. McKenney wrote:
> > This change makes the memory ordering requirements
> > more evident, and it might well also speed up the to-idle and from-idle
> > fastpaths on some architectures.
> 
> Cleaning up the memory ordering requirements certainly seems worthwhile.
> But is there any straightforward benchmark that might quantify the
> "might well also speed up" here? How much does weakening the memory
> ordering buy us, in practice?

None that I know of!

							Thanx, Paul