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Message-ID: <20221130181316.GA1012431@paulmck-ThinkPad-P17-Gen-1>
Date: Wed, 30 Nov 2022 10:13:16 -0800
From: "Paul E. McKenney" <paulmck@...nel.org>
To: rcu@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, kernel-team@...a.com,
rostedt@...dmis.org
Subject: [PATCH v3 rcu 0/16] Lazy call_rcu() updates for v6.2
Hello!
This series provides energy efficiency for nearly-idle systems by making
call_rcu() more lazy. Several NOCB changes come along for the ride:
1. Simplify rcu_init_nohz() cpumask handling, courtesy of Zhen Lei.
2. Fix late wakeup when flush of bypass cblist happens, courtesy of
"Joel Fernandes (Google)".
3. Fix missing nocb gp wake on rcu_barrier(), courtesy of Frederic
Weisbecker.
4. Make call_rcu() lazy to save power, courtesy of "Joel Fernandes
(Google)".
5. Refactor code a bit in rcu_nocb_do_flush_bypass(), courtesy of
"Joel Fernandes (Google)".
6. Shrinker for lazy rcu, courtesy of Vineeth Pillai.
7. Add laziness and kfree tests, courtesy of "Joel Fernandes
(Google)".
8. Use call_rcu_hurry() instead of call_rcu, courtesy of "Joel
Fernandes (Google)".
9. Use call_rcu_hurry() for async reader test, courtesy of "Joel
Fernandes (Google)".
10. Use call_rcu_hurry() where needed, courtesy of "Joel Fernandes
(Google)".
11. scsi/scsi_error: Use call_rcu_hurry() instead of call_rcu(),
courtesy of Uladzislau Rezki.
12. percpu-refcount: Use call_rcu_hurry() for atomic switch, courtesy
of "Joel Fernandes (Google)".
13. Make queue_rcu_work() use call_rcu_hurry(), courtesy of Uladzislau
Rezki.
14. Use call_rcu_hurry() instead of call_rcu(), courtesy of "Joel
Fernandes (Google)".
15. Use call_rcu_hurry() for dst_release(), courtesy of "Joel
Fernandes (Google)".
16. devinet: Reduce refcount before grace period, courtesy of Eric
Dumazet.
Changes since v2:
o Rename call_rcu_flush() to call_rcu_hurry() to avoid naming
conflicts in workqueues as suggested by Tejun Heo.
o Apply acks and reviews.
https://lore.kernel.org/all/20221122010408.GA3799268@paulmck-ThinkPad-P17-Gen-1/
Changes since v1:
o Add more adjustments to avoid excessive laziness (#15 and
#16 above).
o Get appropriate Cc lines onto non-RCU patches.
https://lore.kernel.org/all/20221019225138.GA2499943@paulmck-ThinkPad-P17-Gen-1/
Thanx, Paul
------------------------------------------------------------------------
b/drivers/scsi/scsi_error.c | 2
b/include/linux/rcupdate.h | 9 +
b/kernel/rcu/Kconfig | 8 +
b/kernel/rcu/rcu.h | 8 +
b/kernel/rcu/rcuscale.c | 67 +++++++++++-
b/kernel/rcu/rcutorture.c | 16 +-
b/kernel/rcu/sync.c | 2
b/kernel/rcu/tiny.c | 2
b/kernel/rcu/tree.c | 11 +
b/kernel/rcu/tree.h | 1
b/kernel/rcu/tree_exp.h | 2
b/kernel/rcu/tree_nocb.h | 34 +-----
b/kernel/workqueue.c | 2
b/lib/percpu-refcount.c | 3
b/net/core/dst.c | 2
b/net/ipv4/devinet.c | 19 +--
b/net/rxrpc/conn_object.c | 2
kernel/rcu/rcuscale.c | 2
kernel/rcu/tree.c | 129 +++++++++++++++--------
kernel/rcu/tree.h | 11 +
kernel/rcu/tree_nocb.h | 243 ++++++++++++++++++++++++++++++++++++--------
21 files changed, 434 insertions(+), 141 deletions(-)
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