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Message-Id: <20220302154810.42308-1-frederic@kernel.org>
Date: Wed, 2 Mar 2022 16:47:51 +0100
From: Frederic Weisbecker <frederic@...nel.org>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Frederic Weisbecker <frederic@...nel.org>,
Peter Zijlstra <peterz@...radead.org>,
Phil Auld <pauld@...hat.com>,
Alex Belits <abelits@...vell.com>,
Nicolas Saenz Julienne <nsaenz@...nel.org>,
Xiongfeng Wang <wangxiongfeng2@...wei.com>,
Neeraj Upadhyay <quic_neeraju@...cinc.com>,
Thomas Gleixner <tglx@...utronix.de>,
Yu Liao <liaoyu15@...wei.com>,
Boqun Feng <boqun.feng@...il.com>,
"Paul E . McKenney" <paulmck@...nel.org>,
Marcelo Tosatti <mtosatti@...hat.com>,
Paul Gortmaker <paul.gortmaker@...driver.com>,
Uladzislau Rezki <uladzislau.rezki@...y.com>,
Joel Fernandes <joel@...lfernandes.org>
Subject: [PATCH 00/19] rcu/context-tracking: Merge RCU eqs-dynticks counter to context tracking
This mixes up the RCU dynticks counter and the context tracking state
updates into a single atomic instruction. This may serve several
purposes:
1) Improve CPU isolation with deferring some disturbances until sensitive
userspace workload completes and goes to the kernel. This can take
several forms, for example smp_call_function_housekeeping() or
on_each_housekeeping_cpu() to enqueue and execute work on all
housekeeping CPUs. Then an atomic operation on ct->state can defer
the work on nohz_full CPUs until they run in kernel (or IPI them
if they are in kernel mode), see this proposal by Peter:
https://lore.kernel.org/all/20210929151723.162004989@infradead.org/#r
2) Unearth sysidle (https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git/commit/?h=sysidle.2017.05.11a&id=fe5ac724d81a3c7803e60c2232718f212f3f38d4)
This feature allowed to shutdown the tick on the last housekeeping
CPU once the rest of the system is fully idle. We needed some proper
fully ordered context tracking for that.
Inspired by Peterz: https://lore.kernel.org/all/20210929151723.162004989@infradead.org
git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
rcu/context-tracking
HEAD: e4eaff86ec91c1cbde9a113cf5232dac9f897337
Thanks,
Frederic
---
Frederic Weisbecker (19):
context_tracking: Rename __context_tracking_enter/exit() to __ct_user_enter/exit()
context_tracking: Rename context_tracking_user_enter/exit() to user_enter/exit_callable()
context_tracking: Rename context_tracking_enter/exit() to ct_user_enter/exit()
context_tracking: Rename context_tracking_cpu_set() to context_tracking_cpu_track_user()
context_tracking: Split user tracking Kconfig
context_tracking: Take idle eqs entrypoints over RCU
context_tracking: Take IRQ eqs entrypoints over RCU
context_tracking: Take NMI eqs entrypoints over RCU
rcu/context-tracking: Remove rcu_irq_enter/exit()
rcu/context_tracking: Move dynticks counter to context tracking
rcu/context_tracking: Move dynticks_nesting to context tracking
rcu/context_tracking: Move dynticks_nmi_nesting to context tracking
rcu/context-tracking: Move deferred nocb resched to context tracking
rcu/context-tracking: Move RCU-dynticks internal functions to context_tracking
rcu/context-tracking: Remove unused and/or unecessary middle functions
context_tracking: Convert state to atomic_t
rcu/context-tracking: Use accessor for dynticks counter value
rcu/context_tracking: Merge dynticks counter and context tracking states
context_tracking: Exempt CONFIG_HAVE_CONTEXT_TRACKING_USER_OFFSTACK from non-active tracking
.../RCU/Design/Requirements/Requirements.rst | 10 +-
Documentation/RCU/stallwarn.rst | 6 +-
.../time/context-tracking/arch-support.txt | 6 +-
arch/Kconfig | 8 +-
arch/arm/Kconfig | 2 +-
arch/arm/kernel/entry-common.S | 4 +-
arch/arm/kernel/entry-header.S | 12 +-
arch/arm/mach-imx/cpuidle-imx6q.c | 5 +-
arch/arm64/Kconfig | 2 +-
arch/arm64/kernel/entry-common.c | 14 +-
arch/csky/Kconfig | 2 +-
arch/csky/kernel/entry.S | 8 +-
arch/mips/Kconfig | 2 +-
arch/powerpc/Kconfig | 2 +-
arch/powerpc/include/asm/context_tracking.h | 2 +-
arch/riscv/Kconfig | 2 +-
arch/riscv/kernel/entry.S | 12 +-
arch/sparc/Kconfig | 2 +-
arch/sparc/kernel/rtrap_64.S | 2 +-
arch/x86/Kconfig | 4 +-
arch/x86/mm/fault.c | 2 +-
drivers/acpi/processor_idle.c | 5 +-
drivers/cpuidle/cpuidle-psci.c | 8 +-
drivers/cpuidle/cpuidle.c | 9 +-
include/linux/context_tracking.h | 81 ++--
include/linux/context_tracking_irq.h | 21 +
include/linux/context_tracking_state.h | 92 +++-
include/linux/entry-common.h | 10 +-
include/linux/hardirq.h | 12 +-
include/linux/rcupdate.h | 7 +-
include/linux/rcutiny.h | 6 -
include/linux/rcutree.h | 15 +-
include/linux/tracepoint.h | 4 +-
init/Kconfig | 4 +-
kernel/context_tracking.c | 526 +++++++++++++++++++--
kernel/cpu_pm.c | 8 +-
kernel/entry/common.c | 16 +-
kernel/extable.c | 4 +-
kernel/locking/lockdep.c | 2 +-
kernel/rcu/Kconfig | 2 +
kernel/rcu/rcu.h | 4 -
kernel/rcu/tree.c | 478 ++-----------------
kernel/rcu/tree.h | 8 -
kernel/rcu/tree_exp.h | 2 +-
kernel/rcu/tree_plugin.h | 36 +-
kernel/rcu/tree_stall.h | 7 +-
kernel/rcu/update.c | 2 +-
kernel/sched/core.c | 2 +-
kernel/sched/idle.c | 11 +-
kernel/softirq.c | 4 +-
kernel/time/Kconfig | 22 +-
kernel/time/tick-sched.c | 2 +-
kernel/trace/trace.c | 8 +-
53 files changed, 793 insertions(+), 734 deletions(-)
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