linux-kernel - [PATCH 04/12] rcutorture: Make torture.sh --do-rt use CONFIG_PREEMPT

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Message-ID: <20250418161005.2425391-19-joelagnelf@nvidia.com>
Date: Fri, 18 Apr 2025 12:09:50 -0400
From: Joel Fernandes <joelagnelf@...dia.com>
To: linux-kernel@...r.kernel.org,
	"Paul E. McKenney" <paulmck@...nel.org>,
	Josh Triplett <josh@...htriplett.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Lai Jiangshan <jiangshanlai@...il.com>,
	Shuah Khan <shuah@...nel.org>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Clark Williams <clrkwllms@...nel.org>
Cc: rcu@...r.kernel.org,
	Joel Fernandes <joelagnelf@...dia.com>,
	linux-kselftest@...r.kernel.org,
	linux-rt-devel@...ts.linux.dev
Subject: [PATCH 04/12] rcutorture: Make torture.sh --do-rt use CONFIG_PREEMPT_RT

From: "Paul E. McKenney" <paulmck@...nel.org>

The torture.sh --do-rt command-line parameter is intended to mimic -rt
kernels.  Now that CONFIG_PREEMPT_RT is upstream, this commit makes this
mimicking more precise.

Note that testing of RCU priority boosting is disabled in favor
of forward-progress testing of RCU callbacks.  If it turns out to be
possible to make kernels built with CONFIG_PREEMPT_RT=y to tolerate
testing of both, both will be enabled.

[ paulmck: Apply Sebastian Siewior feedback. ]

Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
Cc: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Signed-off-by: Joel Fernandes <joelagnelf@...dia.com>
---
 tools/testing/selftests/rcutorture/bin/torture.sh | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/tools/testing/selftests/rcutorture/bin/torture.sh b/tools/testing/selftests/rcutorture/bin/torture.sh
index 0447c4a00cc4..d53ee1e0ffc7 100755
--- a/tools/testing/selftests/rcutorture/bin/torture.sh
+++ b/tools/testing/selftests/rcutorture/bin/torture.sh
@@ -448,13 +448,17 @@ fi
 
 if test "$do_rt" = "yes"
 then
-	# With all post-boot grace periods forced to normal.
-	torture_bootargs="rcupdate.rcu_cpu_stall_suppress_at_boot=1 torture.disable_onoff_at_boot rcupdate.rcu_task_stall_timeout=30000 rcupdate.rcu_normal=1"
-	torture_set "rcurttorture" tools/testing/selftests/rcutorture/bin/kvm.sh --allcpus --duration "$duration_rcutorture" --configs "TREE03" --trust-make
+	# In both runs, disable testing of RCU priority boosting because
+	# -rt doesn't like its interaction with testing of callback
+	# flooding.
+
+	# With all post-boot grace periods forced to normal (default for PREEMPT_RT).
+	torture_bootargs="rcupdate.rcu_cpu_stall_suppress_at_boot=1 torture.disable_onoff_at_boot rcupdate.rcu_task_stall_timeout=30000 rcutorture.test_boost=0 rcutorture.preempt_duration=0"
+	torture_set "rcurttorture" tools/testing/selftests/rcutorture/bin/kvm.sh --allcpus --duration "$duration_rcutorture" --configs "TREE03" --kconfig "CONFIG_PREEMPT_RT=y CONFIG_EXPERT=y CONFIG_HZ_PERIODIC=n CONFIG_NO_HZ_IDLE=y" --trust-make
 
 	# With all post-boot grace periods forced to expedited.
-	torture_bootargs="rcupdate.rcu_cpu_stall_suppress_at_boot=1 torture.disable_onoff_at_boot rcupdate.rcu_task_stall_timeout=30000 rcupdate.rcu_expedited=1"
-	torture_set "rcurttorture-exp" tools/testing/selftests/rcutorture/bin/kvm.sh --allcpus --duration "$duration_rcutorture" --configs "TREE03" --trust-make
+	torture_bootargs="rcupdate.rcu_cpu_stall_suppress_at_boot=1 torture.disable_onoff_at_boot rcupdate.rcu_task_stall_timeout=30000 rcutorture.test_boost=0 rcupdate.rcu_normal_after_boot=0 rcupdate.rcu_expedited=1 rcutorture.preempt_duration=0"
+	torture_set "rcurttorture-exp" tools/testing/selftests/rcutorture/bin/kvm.sh --allcpus --duration "$duration_rcutorture" --configs "TREE03" --kconfig "CONFIG_PREEMPT_RT=y CONFIG_EXPERT=y CONFIG_HZ_PERIODIC=n CONFIG_NO_HZ_FULL=y" --trust-make
 fi
 
 if test "$do_srcu_lockdep" = "yes"
-- 
2.43.0