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Message-Id: <20240802003750.4134451-3-paulmck@kernel.org>
Date: Thu, 1 Aug 2024 17:37:50 -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 3/3] torture: Add torture.sh --guest-cpu-limit argument for limited hosts
Some servers have limitations on the number of CPUs a given guest OS
can use. In my earlier experience, such limitations have been at least
half of the host's CPUs, but in a recent example, this limit is less
than 40%. This commit therefore adds a --guest-cpu-limit argument that
allows such low limits to be made known to torture.sh.
Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
---
.../selftests/rcutorture/bin/torture.sh | 38 +++++++++++++------
1 file changed, 27 insertions(+), 11 deletions(-)
diff --git a/tools/testing/selftests/rcutorture/bin/torture.sh b/tools/testing/selftests/rcutorture/bin/torture.sh
index 990d24696fd34..0447c4a00cc4d 100755
--- a/tools/testing/selftests/rcutorture/bin/torture.sh
+++ b/tools/testing/selftests/rcutorture/bin/torture.sh
@@ -19,10 +19,10 @@ PATH=${RCUTORTURE}/bin:$PATH; export PATH
TORTURE_ALLOTED_CPUS="`identify_qemu_vcpus`"
MAKE_ALLOTED_CPUS=$((TORTURE_ALLOTED_CPUS*2))
-HALF_ALLOTED_CPUS=$((TORTURE_ALLOTED_CPUS/2))
-if test "$HALF_ALLOTED_CPUS" -lt 1
+SCALE_ALLOTED_CPUS=$((TORTURE_ALLOTED_CPUS/2))
+if test "$SCALE_ALLOTED_CPUS" -lt 1
then
- HALF_ALLOTED_CPUS=1
+ SCALE_ALLOTED_CPUS=1
fi
VERBOSE_BATCH_CPUS=$((TORTURE_ALLOTED_CPUS/16))
if test "$VERBOSE_BATCH_CPUS" -lt 2
@@ -90,6 +90,7 @@ usage () {
echo " --do-scftorture / --do-no-scftorture / --no-scftorture"
echo " --do-srcu-lockdep / --do-no-srcu-lockdep / --no-srcu-lockdep"
echo " --duration [ <minutes> | <hours>h | <days>d ]"
+ echo " --guest-cpu-limit N"
echo " --kcsan-kmake-arg kernel-make-arguments"
exit 1
}
@@ -203,6 +204,21 @@ do
duration_base=$(($ts*mult))
shift
;;
+ --guest-cpu-limit|--guest-cpu-lim)
+ checkarg --guest-cpu-limit "(number)" "$#" "$2" '^[0-9]*$' '^--'
+ if (("$2" <= "$TORTURE_ALLOTED_CPUS" / 2))
+ then
+ SCALE_ALLOTED_CPUS="$2"
+ VERBOSE_BATCH_CPUS="$((SCALE_ALLOTED_CPUS/8))"
+ if (("$VERBOSE_BATCH_CPUS" < 2))
+ then
+ VERBOSE_BATCH_CPUS=0
+ fi
+ else
+ echo "Ignoring value of $2 for --guest-cpu-limit which is greater than (("$TORTURE_ALLOTED_CPUS" / 2))."
+ fi
+ shift
+ ;;
--kcsan-kmake-arg|--kcsan-kmake-args)
checkarg --kcsan-kmake-arg "(kernel make arguments)" $# "$2" '.*' '^error$'
kcsan_kmake_args="`echo "$kcsan_kmake_args $2" | sed -e 's/^ *//' -e 's/ *$//'`"
@@ -425,9 +441,9 @@ fi
if test "$do_scftorture" = "yes"
then
# Scale memory based on the number of CPUs.
- scfmem=$((3+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 ${scfmem}G --trust-make
+ scfmem=$((3+SCALE_ALLOTED_CPUS/16))
+ torture_bootargs="scftorture.nthreads=$SCALE_ALLOTED_CPUS torture.disable_onoff_at_boot csdlock_debug=1"
+ torture_set "scftorture" tools/testing/selftests/rcutorture/bin/kvm.sh --torture scf --allcpus --duration "$duration_scftorture" --configs "$configs_scftorture" --kconfig "CONFIG_NR_CPUS=$SCALE_ALLOTED_CPUS" --memory ${scfmem}G --trust-make
fi
if test "$do_rt" = "yes"
@@ -471,8 +487,8 @@ for prim in $primlist
do
if test -n "$firsttime"
then
- torture_bootargs="refscale.scale_type="$prim" refscale.nreaders=$HALF_ALLOTED_CPUS refscale.loops=10000 refscale.holdoff=20 torture.disable_onoff_at_boot"
- torture_set "refscale-$prim" tools/testing/selftests/rcutorture/bin/kvm.sh --torture refscale --allcpus --duration 5 --kconfig "CONFIG_TASKS_TRACE_RCU=y CONFIG_NR_CPUS=$HALF_ALLOTED_CPUS" --bootargs "refscale.verbose_batched=$VERBOSE_BATCH_CPUS torture.verbose_sleep_frequency=8 torture.verbose_sleep_duration=$VERBOSE_BATCH_CPUS" --trust-make
+ torture_bootargs="refscale.scale_type="$prim" refscale.nreaders=$SCALE_ALLOTED_CPUS refscale.loops=10000 refscale.holdoff=20 torture.disable_onoff_at_boot"
+ torture_set "refscale-$prim" tools/testing/selftests/rcutorture/bin/kvm.sh --torture refscale --allcpus --duration 5 --kconfig "CONFIG_TASKS_TRACE_RCU=y CONFIG_NR_CPUS=$SCALE_ALLOTED_CPUS" --bootargs "refscale.verbose_batched=$VERBOSE_BATCH_CPUS torture.verbose_sleep_frequency=8 torture.verbose_sleep_duration=$VERBOSE_BATCH_CPUS" --trust-make
mv $T/last-resdir-nodebug $T/first-resdir-nodebug || :
if test -f "$T/last-resdir-kasan"
then
@@ -520,8 +536,8 @@ for prim in $primlist
do
if test -n "$firsttime"
then
- torture_bootargs="rcuscale.scale_type="$prim" rcuscale.nwriters=$HALF_ALLOTED_CPUS rcuscale.holdoff=20 torture.disable_onoff_at_boot"
- torture_set "rcuscale-$prim" tools/testing/selftests/rcutorture/bin/kvm.sh --torture rcuscale --allcpus --duration 5 --kconfig "CONFIG_TASKS_TRACE_RCU=y CONFIG_NR_CPUS=$HALF_ALLOTED_CPUS" --trust-make
+ torture_bootargs="rcuscale.scale_type="$prim" rcuscale.nwriters=$SCALE_ALLOTED_CPUS rcuscale.holdoff=20 torture.disable_onoff_at_boot"
+ torture_set "rcuscale-$prim" tools/testing/selftests/rcutorture/bin/kvm.sh --torture rcuscale --allcpus --duration 5 --kconfig "CONFIG_TASKS_TRACE_RCU=y CONFIG_NR_CPUS=$SCALE_ALLOTED_CPUS" --trust-make
mv $T/last-resdir-nodebug $T/first-resdir-nodebug || :
if test -f "$T/last-resdir-kasan"
then
@@ -559,7 +575,7 @@ do_kcsan="$do_kcsan_save"
if test "$do_kvfree" = "yes"
then
torture_bootargs="rcuscale.kfree_rcu_test=1 rcuscale.kfree_nthreads=16 rcuscale.holdoff=20 rcuscale.kfree_loops=10000 torture.disable_onoff_at_boot"
- torture_set "rcuscale-kvfree" tools/testing/selftests/rcutorture/bin/kvm.sh --torture rcuscale --allcpus --duration $duration_rcutorture --kconfig "CONFIG_NR_CPUS=$HALF_ALLOTED_CPUS" --memory 2G --trust-make
+ torture_set "rcuscale-kvfree" tools/testing/selftests/rcutorture/bin/kvm.sh --torture rcuscale --allcpus --duration $duration_rcutorture --kconfig "CONFIG_NR_CPUS=$SCALE_ALLOTED_CPUS" --memory 2G --trust-make
fi
if test "$do_clocksourcewd" = "yes"
--
2.40.1
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