linux-kernel - [PATCH tip/core/rcu 0/12] NO

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Date:   Wed, 2 Oct 2019 18:38:34 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     rcu@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, mingo@...nel.org,
        jiangshanlai@...il.com, dipankar@...ibm.com,
        akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
        josh@...htriplett.org, tglx@...utronix.de, peterz@...radead.org,
        rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com,
        fweisbec@...il.com, oleg@...hat.com, joel@...lfernandes.org
Subject: [PATCH tip/core/rcu 0/12] NO_HZ fixes for v5.5

Hello!

This series contains various fixes for NO_HZ and NO_HZ_FULL problems,
including re-enabling the tick during long-term kernel-mode execution.

1.	Add TICK_DEP_BIT_RCU (which allows RCU-specific tick re-enabling),
	courtesy of Frederic Weisbecker.

2.	Export tick start/stop functions for rcutorture.

3.	Force on tick when invoking lots of callbacks.

4.	Force on tick for rcutorture readers and callback flooders.

5.	Provide RCU quiescent state in multi_cpu_stop().

6.	Make CPU-hotplug removal operations enable tick.

7.	Use {READ,WRITE)_ONCE() for multi_cpu_stop() ->state.

8.	Force tick on for nohz_full CPUs not reaching quiescent states.

9.	Force nohz_full tick on upon irq enter instead of exit.

10.	Reset CPU hints when reporting a quiescent state, courtesy of
	Joel Fernandes.

11.	Confine ->core_needs_qs accesses to the corresponding CPU.

12.	Make kernel-mode nohz_full CPUs invoke the RCU core processing.

							Thanx, Paul

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

 include/linux/rcutree.h      |    1 
 include/linux/tick.h         |    7 ++
 include/trace/events/timer.h |    3 -
 kernel/rcu/rcutorture.c      |   20 +++++---
 kernel/rcu/tree.c            |  105 ++++++++++++++++++++++++++++++-------------
 kernel/rcu/tree.h            |    1 
 kernel/stop_machine.c        |    7 +-
 kernel/time/tick-sched.c     |   11 ++++
 8 files changed, 114 insertions(+), 41 deletions(-)