linux-kernel - [PATCH v3 rcu 0/13] SRCU-lite changes for v6.13

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Message-ID: <ddf64299-de71-41a2-b575-56ec173faf75@paulmck-laptop>
Date: Tue, 15 Oct 2024 09:11:03 -0700
From: "Paul E. McKenney" <paulmck@...nel.org>
To: frederic@...nel.org, rcu@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, kernel-team@...a.com, rostedt@...dmis.org
Subject: [PATCH v3 rcu 0/13] SRCU-lite changes for v6.13

Hello!

This v3 series adds support and testing for srcu_read_lock_lite()
and srcu_read_unlock_lite(), which avoid smp_mb(), but add a couple of
synchronize_rcu() calls to the grace-period processing and may only be
used where RCU is watching.

1.	Rename srcu_might_be_idle() to srcu_should_expedite().

2.	Introduce srcu_gp_is_expedited() helper function.

3.	Renaming in preparation for additional reader flavor.

4.	Bit manipulation changes for additional reader flavor.

5.	Standardize srcu_data pointers to "sdp" and similar.

6.	Improve srcu_read_lock{,_nmisafe}() comments.

7.	Create CPP macros for normal and NMI-safe SRCU readers.

8.	Add srcu_read_lock_lite() and srcu_read_unlock_lite().

9.	Allow inlining of __srcu_read_{,un}lock_lite().

10.	Expand RCUTORTURE_RDR_MASK_[12] to eight bits.

11.	Add reader_flavor parameter for SRCU readers.

12.	Add srcu_read_lock_lite() support to rcutorture.reader_flavor.

13.	Add light-weight SRCU scenario.

14.	Add srcu_read_lock_lite() support using "srcu-lite".

15.	Improve srcu_read_lock_lite() kernel-doc comment.

Changes since v2:

o	Apply acked-by tag.

o	Split commit per Neeraj Upadhyay feedback.

Changes since v1:

o	Apply reviewed-by tag.

o	Link to performance data.

o	Add commit improving kernel-doc comment.

o	Pull out into separate branch to avoid dependency on an otherwise
	unrelated refscale commit.

						Thanx, Paul

------------------------------------------------------------------------

 Documentation/admin-guide/kernel-parameters.txt              |    4 
 b/Documentation/admin-guide/kernel-parameters.txt            |    8 
 b/include/linux/srcu.h                                       |   21 -
 b/include/linux/srcutree.h                                   |    2 
 b/kernel/rcu/rcutorture.c                                    |   28 -
 b/kernel/rcu/refscale.c                                      |   51 ++
 b/kernel/rcu/srcutree.c                                      |   16 
 b/tools/testing/selftests/rcutorture/configs/rcu/CFLIST      |    1 
 b/tools/testing/selftests/rcutorture/configs/rcu/SRCU-L      |   10 
 b/tools/testing/selftests/rcutorture/configs/rcu/SRCU-L.boot |    3 
 b/tools/testing/selftests/rcutorture/configs/rcu/SRCU-N.boot |    1 
 b/tools/testing/selftests/rcutorture/configs/rcu/TREE10      |    2 
 include/linux/srcu.h                                         |   89 +++-
 include/linux/srcutree.h                                     |   44 ++
 kernel/rcu/rcutorture.c                                      |   37 +
 kernel/rcu/srcutree.c                                        |  207 ++++++-----
 16 files changed, 363 insertions(+), 161 deletions(-)