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McKenney" , Josh Triplett , Steven Rostedt , Mathieu Desnoyers , Lai Jiangshan , Shuah Khan , Sebastian Andrzej Siewior , Clark Williams Cc: rcu@vger.kernel.org, Joel Fernandes , linux-kselftest@vger.kernel.org, linux-rt-devel@lists.linux.dev Subject: [PATCH 04/14] rcutorture: Make torture.sh --do-rt use CONFIG_PREEMPT_RT Date: Fri, 18 Apr 2025 12:09:36 -0400 Message-ID: <20250418161005.2425391-5-joelagnelf@nvidia.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250418161005.2425391-1-joelagnelf@nvidia.com> References: <20250418161005.2425391-1-joelagnelf@nvidia.com> Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: BN9PR03CA0138.namprd03.prod.outlook.com (2603:10b6:408:fe::23) To SN7PR12MB8059.namprd12.prod.outlook.com (2603:10b6:806:32b::7) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SN7PR12MB8059:EE_|CH2PR12MB9544:EE_ X-MS-Office365-Filtering-Correlation-Id: 7bbc3fd4-e5e3-45de-c7ac-08dd7e93888d X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|1800799024|7416014|366016; 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charset="utf-8" From: "Paul E. McKenney" 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=3Dy to tolerate testing of both, both will be enabled. [ paulmck: Apply Sebastian Siewior feedback. ] Signed-off-by: Paul E. McKenney Cc: Sebastian Andrzej Siewior Signed-off-by: Joel Fernandes --- 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/test= ing/selftests/rcutorture/bin/torture.sh index 0447c4a00cc4..b64b356f55ff 100755 --- a/tools/testing/selftests/rcutorture/bin/torture.sh +++ b/tools/testing/selftests/rcutorture/bin/torture.sh @@ -448,13 +448,17 @@ fi =20 if test "$do_rt" =3D "yes" then - # With all post-boot grace periods forced to normal. - torture_bootargs=3D"rcupdate.rcu_cpu_stall_suppress_at_boot=3D1 torture.d= isable_onoff_at_boot rcupdate.rcu_task_stall_timeout=3D30000 rcupdate.rcu_n= ormal=3D1" - torture_set "rcurttorture" tools/testing/selftests/rcutorture/bin/kvm.sh = --allcpus --duration "$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=3D"rcupdate.rcu_cpu_stall_suppress_at_boot=3D1 torture.d= isable_onoff_at_boot rcupdate.rcu_task_stall_timeout=3D30000 rcutorture.tes= t_boost=3D0 rcutorture.preempt_duration=3D0" + torture_set "rcurttorture" tools/testing/selftests/rcutorture/bin/kvm.sh = --allcpus --duration "$duration_rcutorture" --configs "TREE03" --kconfig "C= ONFIG_PREEMPT_RT=3Dy CONFIG_EXPERT=3Dy CONFIG_HZ_PERIODIC=3Dn CONFIG_NO_HZ_= IDLE=3Dy CONFIG_RCU_NOCB_CPU=3Dy" --trust-make =20 # With all post-boot grace periods forced to expedited. - torture_bootargs=3D"rcupdate.rcu_cpu_stall_suppress_at_boot=3D1 torture.d= isable_onoff_at_boot rcupdate.rcu_task_stall_timeout=3D30000 rcupdate.rcu_e= xpedited=3D1" - torture_set "rcurttorture-exp" tools/testing/selftests/rcutorture/bin/kvm= .sh --allcpus --duration "$duration_rcutorture" --configs "TREE03" --trust-= make + torture_bootargs=3D"rcupdate.rcu_cpu_stall_suppress_at_boot=3D1 torture.d= isable_onoff_at_boot rcupdate.rcu_task_stall_timeout=3D30000 rcutorture.tes= t_boost=3D0 rcupdate.rcu_normal_after_boot=3D0 rcupdate.rcu_expedited=3D1 r= cutorture.preempt_duration=3D0" + torture_set "rcurttorture-exp" tools/testing/selftests/rcutorture/bin/kvm= .sh --allcpus --duration "$duration_rcutorture" --configs "TREE03" --kconfi= g "CONFIG_PREEMPT_RT=3Dy CONFIG_EXPERT=3Dy CONFIG_HZ_PERIODIC=3Dn CONFIG_NO= _HZ_FULL=3Dy CONFIG_RCU_NOCB_CPU=3Dy" --trust-make fi =20 if test "$do_srcu_lockdep" =3D "yes" --=20 2.43.0