linux-kernel - [PATCH RT 0/4] Address rcutorture issues

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Date:   Tue, 18 Jun 2019 20:19:04 -0500
From:   Scott Wood <swood@...hat.com>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:     "Paul E. McKenney" <paulmck@...ux.ibm.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Juri Lelli <juri.lelli@...hat.com>,
        Clark Williams <williams@...hat.com>,
        linux-rt-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH RT 0/4] Address rcutorture issues

With these patches, rcutorture mostly works on PREEMPT_RT_FULL.  I still
once in a while get forward progress complaints (particularly,
rcu_torture_fwd_prog_cr) when a grace period is held up for a few seconds
after which point so many callbacks have been enqueued that even making
reasonable progress isn't going to beat the timeout.  I believe I've only
seen this when running heavy loads in addition to rcutorture (though I've
done more testing under load than without); I don't know whether the
forward progress tests are expected to work under such load.

Scott Wood (4):
  rcu: Acquire RCU lock when disabling BHs
  sched: migrate_enable: Use sleeping_lock to indicate involuntary sleep
  rcu: unlock special: Treat irq and preempt disabled the same
  rcutorture: Avoid problematic critical section nesting

 include/linux/rcupdate.h |  4 +++
 include/linux/sched.h    |  4 +--
 kernel/rcu/rcutorture.c  | 92 ++++++++++++++++++++++++++++++++++++++++--------
 kernel/rcu/tree_plugin.h | 12 ++-----
 kernel/rcu/update.c      |  4 +++
 kernel/sched/core.c      |  2 ++
 kernel/softirq.c         | 12 +++++--
 7 files changed, 102 insertions(+), 28 deletions(-)

-- 
1.8.3.1