linux-kernel - [PATCH tip/core/rcu 0/4] Fix RCU priority boosting

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Date:   Tue, 19 Jan 2021 20:31:44 -0800
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     rcu@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, kernel-team@...com, mingo@...nel.org,
        jiangshanlai@...il.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, bigeasy@...utronix.de,
        swood@...hat.com
Subject: [PATCH tip/core/rcu 0/4] Fix RCU priority boosting

Hello!

This series fixes a bug in which an RCU-priority-boosted task can stay
boosted for some time after it has exited its RCU read-side critical
section.  This bug arose during the RCU flavor consolidation effort.
The patches are as follows:

1.	Expedite deboost in case of deferred quiescent state.

2.	Make TREE03 use real-time tree.use_softirq setting.

3.	Run rcuo kthreads at elevated priority in CONFIG_RCU_BOOST
	kernels.

4.	Fix testing of RCU priority boosting.

						Thanx, Paul

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

 kernel/rcu/rcutorture.c                                    |   36 +++++++------
 kernel/rcu/tree_plugin.h                                   |   28 +++++-----
 tools/testing/selftests/rcutorture/configs/rcu/TREE03.boot |    1 
 3 files changed, 39 insertions(+), 26 deletions(-)