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

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Message-ID: <ZmkwdFhXK2SsVWa4@Boquns-Mac-mini.home>
Date: Tue, 11 Jun 2024 22:21:56 -0700
From: Boqun Feng <boqun.feng@...il.com>
To: "Paul E. McKenney" <paulmck@...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 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: Boqun Feng <boqun.feng@...il.com>

Regards,
Boqun

> 						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(-)
>