From: "Paul E. McKenney" <paulmck@kernel.org>
To: rcu@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, kernel-team@fb.com,
mingo@kernel.org, jiangshanlai@gmail.com, dipankar@in.ibm.com,
akpm@linux-foundation.org, mathieu.desnoyers@efficios.com,
josh@joshtriplett.org, tglx@linutronix.de, peterz@infradead.org,
rostedt@goodmis.org, dhowells@redhat.com, edumazet@google.com,
fweisbec@gmail.com, oleg@redhat.com, joel@joelfernandes.org
Subject: [PATCH tip/core/rcu 0/13] Add strict grace periods for KASAN use for v5.10
Date: Mon, 31 Aug 2020 11:11:01 -0700 [thread overview]
Message-ID: <20200831181101.GA950@paulmck-ThinkPad-P72> (raw)
Hello!
This series adds strict grace periods that are as short as is reasonably
practical. This feature is enabled using a new RCU_STRICT_GRACE_PERIOD
Kconfig option, and severely degrades performance and scalability.
It should therefore be avoided in production.
1. Add Kconfig option for strict RCU grace periods.
2. Reduce leaf fanout for strict RCU grace periods.
3. Restrict default jiffies_till_first_fqs for strict RCU GPs.
4. Force DEFAULT_RCU_BLIMIT to 1000 for strict RCU GPs.
5. Always set .need_qs from __rcu_read_lock() for strict GPs.
6. Do full report for .need_qs for strict GPs.
7. Attempt QS when CPU discovers GP for strict GPs.
8. IPI all CPUs at GP start for strict GPs.
9. IPI all CPUs at GP end for strict GPs.
10. Provide optional RCU-reader exit delay for strict GPs.
11. Execute RCU reader shortly after rcu_core for strict GPs.
12. Report QS for outermost PREEMPT=n rcu_read_unlock() for strict GPs.
13. Remove unused "cpu" parameter from rcu_report_qs_rdp().
Thanx, Paul
------------------------------------------------------------------------
Documentation/admin-guide/kernel-parameters.txt | 9 ++
include/linux/rcupdate.h | 7 ++
kernel/rcu/Kconfig | 8 +-
kernel/rcu/Kconfig.debug | 15 ++++
kernel/rcu/tree.c | 73 ++++++++++++++++++++----
kernel/rcu/tree.h | 1
kernel/rcu/tree_plugin.h | 52 +++++++++++++----
7 files changed, 139 insertions(+), 26 deletions(-)
next reply other threads:[~2020-08-31 18:11 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-31 18:11 Paul E. McKenney [this message]
2020-08-31 18:11 ` [PATCH tip/core/rcu 01/13] rcu: Add Kconfig option for strict RCU grace periods paulmck
2020-08-31 18:11 ` [PATCH tip/core/rcu 02/13] rcu: Reduce leaf fanout " paulmck
2020-08-31 18:11 ` [PATCH tip/core/rcu 03/13] rcu: Restrict default jiffies_till_first_fqs for strict RCU GPs paulmck
2020-08-31 18:11 ` [PATCH tip/core/rcu 04/13] rcu: Force DEFAULT_RCU_BLIMIT to 1000 " paulmck
2020-08-31 18:11 ` [PATCH tip/core/rcu 05/13] rcu: Always set .need_qs from __rcu_read_lock() for strict GPs paulmck
2020-09-04 4:05 ` Boqun Feng
2020-09-04 13:41 ` Paul E. McKenney
2020-09-07 0:11 ` Boqun Feng
2020-09-07 2:33 ` Paul E. McKenney
2020-08-31 18:11 ` [PATCH tip/core/rcu 06/13] rcu: Do full report for .need_qs " paulmck
2020-08-31 18:11 ` [PATCH tip/core/rcu 07/13] rcu: Attempt QS when CPU discovers GP " paulmck
2020-08-31 18:11 ` [PATCH tip/core/rcu 08/13] rcu: IPI all CPUs at GP start " paulmck
2020-08-31 18:11 ` [PATCH tip/core/rcu 09/13] rcu: IPI all CPUs at GP end " paulmck
2020-08-31 18:11 ` [PATCH tip/core/rcu 10/13] rcu: Provide optional RCU-reader exit delay " paulmck
2020-08-31 18:11 ` [PATCH tip/core/rcu 11/13] rcu: Execute RCU reader shortly after rcu_core " paulmck
2020-08-31 18:11 ` [PATCH tip/core/rcu 12/13] rcu: Report QS for outermost PREEMPT=n rcu_read_unlock() " paulmck
2020-08-31 18:11 ` [PATCH tip/core/rcu 13/13] rcu: Remove unused "cpu" parameter from rcu_report_qs_rdp() paulmck
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