linux-kernel - [PATCH 00/11] rcu: Make rcu_core() safe in PREEMPT

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Message-Id: <20211011145140.359412-1-frederic@kernel.org>
Date:   Mon, 11 Oct 2021 16:51:29 +0200
From:   Frederic Weisbecker <frederic@...nel.org>
To:     "Paul E . McKenney" <paulmck@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Frederic Weisbecker <frederic@...nel.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Valentin Schneider <Valentin.Schneider@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Uladzislau Rezki <urezki@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Valentin Schneider <valentin.schneider@....com>,
        Boqun Feng <boqun.feng@...il.com>,
        Neeraj Upadhyay <neeraju@...eaurora.org>,
        Josh Triplett <josh@...htriplett.org>,
        Joel Fernandes <joel@...lfernandes.org>, rcu@...r.kernel.org
Subject: [PATCH 00/11] rcu: Make rcu_core() safe in PREEMPT_RT with NOCB + a few other fixes v2

Hi,

No code change in this v2, only changelogs:

* Add tags from Valentin and Sebastian

* Remove last reference to SEGCBLIST_SOFTIRQ_ONLY (thanks Valentin)

* Rewrite changelog for "rcu/nocb: Check a stable offloaded state to manipulate qlen_last_fqs_check"
  after off-list debates with Paul.

* Remove the scenario with softirq interrupting rcuc on
  "rcu/nocb: Limit number of softirq callbacks only on softirq" as it's
  probably not possible (thanks Valentin).

* Remove the scenario with task spent scheduling out accounted on tlimit
  as it's not possible (thanks Valentin)
  (see "rcu: Apply callbacks processing time limit only on softirq")

* Fixed changelog of
  "rcu/nocb: Don't invoke local rcu core on callback overload from nocb kthread"
  (thanks Sebastian).

git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
	rcu/rt-v2

HEAD: 2c9349986d5f70a555195139665841cd98e9aba4

Thanks,
	Frederic
---

Frederic Weisbecker (10):
      rcu/nocb: Make local rcu_nocb_lock_irqsave() safe against concurrent deoffloading
      rcu/nocb: Prepare state machine for a new step
      rcu/nocb: Invoke rcu_core() at the start of deoffloading
      rcu/nocb: Make rcu_core() callbacks acceleration (de-)offloading safe
      rcu/nocb: Check a stable offloaded state to manipulate qlen_last_fqs_check
      rcu/nocb: Use appropriate rcu_nocb_lock_irqsave()
      rcu/nocb: Limit number of softirq callbacks only on softirq
      rcu: Fix callbacks processing time limit retaining cond_resched()
      rcu: Apply callbacks processing time limit only on softirq
      rcu/nocb: Don't invoke local rcu core on callback overload from nocb kthread

Thomas Gleixner (1):
      rcu/nocb: Make rcu_core() callbacks acceleration preempt-safe


 include/linux/rcu_segcblist.h | 51 ++++++++++++++++++-------
 kernel/rcu/rcu_segcblist.c    | 10 ++---
 kernel/rcu/rcu_segcblist.h    | 12 +++---
 kernel/rcu/tree.c             | 87 +++++++++++++++++++++++++++++--------------
 kernel/rcu/tree.h             | 16 +++++---
 kernel/rcu/tree_nocb.h        | 29 ++++++++++++---
 6 files changed, 141 insertions(+), 64 deletions(-)