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Message-Id: <20230717181820.1098541-1-paulmck@kernel.org>
Date: Mon, 17 Jul 2023 11:18:17 -0700
From: "Paul E. McKenney" <paulmck@...nel.org>
To: rcu@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, kernel-team@...a.com,
rostedt@...dmis.org, "Paul E. McKenney" <paulmck@...nel.org>
Subject: [PATCH rcu 1/4] torture: Scale scftorture memory based on number of CPUs
As the number of CPUs increases, the number of outstanding no-wait
smp_call_function() handlers also increases, so that the default of
2G of memory is not always sufficient on 80-CPU systems. This commit
therefore scales the amount of memory specified to qemu based on the
number of CPUs specified to the scftorture test instance.
Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
---
tools/testing/selftests/rcutorture/bin/torture.sh | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/tools/testing/selftests/rcutorture/bin/torture.sh b/tools/testing/selftests/rcutorture/bin/torture.sh
index 5a2ae2264403..9fa6526067f0 100755
--- a/tools/testing/selftests/rcutorture/bin/torture.sh
+++ b/tools/testing/selftests/rcutorture/bin/torture.sh
@@ -376,8 +376,10 @@ fi
if test "$do_scftorture" = "yes"
then
+ # Scale memory based on the number of CPUs.
+ scfmem=$((2+HALF_ALLOTED_CPUS/16))
torture_bootargs="scftorture.nthreads=$HALF_ALLOTED_CPUS torture.disable_onoff_at_boot csdlock_debug=1"
- torture_set "scftorture" tools/testing/selftests/rcutorture/bin/kvm.sh --torture scf --allcpus --duration "$duration_scftorture" --configs "$configs_scftorture" --kconfig "CONFIG_NR_CPUS=$HALF_ALLOTED_CPUS" --memory 2G --trust-make
+ torture_set "scftorture" tools/testing/selftests/rcutorture/bin/kvm.sh --torture scf --allcpus --duration "$duration_scftorture" --configs "$configs_scftorture" --kconfig "CONFIG_NR_CPUS=$HALF_ALLOTED_CPUS" --memory ${scfmem}G --trust-make
fi
if test "$do_rt" = "yes"
--
2.40.1
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