linux-kernel - Re: [PATCH rcu 0/6] Grace-period memory-barrier adjustments for v6.11

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Date: Wed, 12 Jun 2024 07:46:21 -0700
From: "Paul E. McKenney" <paulmck@...nel.org>
To: Neeraj Upadhyay <Neeraj.Upadhyay@...nel.org>
Cc: rcu@...r.kernel.org, linux-kernel@...r.kernel.org, kernel-team@...a.com,
	rostedt@...dmis.org
Subject: Re: [PATCH rcu 0/6] Grace-period memory-barrier adjustments for v6.11

On Wed, Jun 12, 2024 at 03:12:07PM +0530, Neeraj Upadhyay wrote:
> On Tue, Jun 04, 2024 at 03:26:46PM -0700, Paul E. McKenney wrote:
> > Hello!
> > 
> > This series removes redundant memory barriers from the grace-period
> > code paths:
> > 
> > 1.	Remove full ordering on second EQS snapshot, courtesy of Frederic
> > 	Weisbecker.
> > 
> > 2.	Remove superfluous full memory barrier upon first EQS snapshot,
> > 	courtesy of Frederic Weisbecker.
> > 
> > 3.	rcu/exp: Remove superfluous full memory barrier upon first EQS
> > 	snapshot, courtesy of Frederic Weisbecker.
> > 
> > 4.	Remove full memory barrier on boot time eqs sanity check,
> > 	courtesy of Frederic Weisbecker.
> > 
> > 5.	Remove full memory barrier on RCU stall printout, courtesy of
> > 	Frederic Weisbecker.
> > 
> > 6.	rcu/exp: Remove redundant full memory barrier at the end of GP,
> > 	courtesy of Frederic Weisbecker.
> > 
> 
> Reviewed-by: Neeraj Upadhyay <neeraj.upadhyay@...nel.org>

I will apply yours and Boqun's tag on the next rebase, thank you both!

						Thanx, Paul

> > ------------------------------------------------------------------------
> > 
> >  b/Documentation/RCU/Design/Memory-Ordering/Tree-RCU-Memory-Ordering.rst |    6 +--
> >  b/kernel/rcu/tree.c                                                     |    2 -
> >  b/kernel/rcu/tree_exp.h                                                 |    8 +++-
> >  b/kernel/rcu/tree_stall.h                                               |    4 +-
> >  kernel/rcu/tree.c                                                       |   19 +++-------
> >  kernel/rcu/tree_exp.h                                                   |    8 +++-
> >  6 files changed, 26 insertions(+), 21 deletions(-)