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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(-) >
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