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torture: Provide bare-metal modprobe-based advice

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In some environments, the torture-testing use of virtualization is
inconvenient.  In such cases, the modprobe and rmmod commands may be used
to do torture testing, but significant setup is required to build, boot,
and modprobe a kernel so as to match a given torture-test scenario.
This commit therefore creates a "bare-metal" file in each results
directory containing steps to run the corresponding scenario using the
modprobe command on bare metal.  For example, the contents of this file
after using kvm.sh to build an rcutorture TREE01 kernel, perhaps with
the --buildonly argument, is as follows:

To run this scenario on bare metal:

 1. Set your bare-metal build tree to the state shown in this file:
    /home/git/linux-rcu/tools/testing/selftests/rcutorture/res/2021.02.04-17.10.19/testid.txt
 2. Update your bare-metal build tree's .config based on this file:
    /home/git/linux-rcu/tools/testing/selftests/rcutorture/res/2021.02.04-17.10.19/TREE01/ConfigFragment
 3. Make the bare-metal kernel's build system aware of your .config updates:
    $ yes "" | make oldconfig
 4. Build your bare-metal kernel.
 5. Boot your bare-metal kernel with the following parameters:
    maxcpus=8 nr_cpus=43 rcutree.gp_preinit_delay=3 rcutree.gp_init_delay=3 rcutree.gp_cleanup_delay=3 rcu_nocbs=0-1,3-7
 6. Start the test with the following command:
    $ modprobe rcutorture nocbs_nthreads=8 nocbs_toggle=1000 fwd_progress=0 onoff_interval=1000 onoff_holdoff=30 n_barrier_cbs=4 stat_interval=15 shutdown_secs=120 test_no_idle_hz=1 verbose=1
 7. After some time, end the test with the following command:
    $ rmmod rcutorture
 8. Copy your bare-metal kernel's .config file, overwriting this file:
    /home/git/linux-rcu/tools/testing/selftests/rcutorture/res/2021.02.04-17.10.19/TREE01/.config
 9. Copy the console output from just before the modprobe to just after
    the rmmod into this file:
    /home/git/linux-rcu/tools/testing/selftests/rcutorture/res/2021.02.04-17.10.19/TREE01/console.log
10. Check for runtime errors using the following command:
   $ tools/testing/selftests/rcutorture/bin/kvm-recheck.sh /home/git/linux-rcu/tools/testing/selftests/rcutorture/res/2021.02.04-17.10.19

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney 2021-02-03 15:44:29 -08:00
parent 3d4977b681
commit a8dafbf3a5
2 changed files with 42 additions and 6 deletions
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44
tools/testing/selftests/rcutorture/bin/kvm-test-1-run.sh
View File

@ -7,15 +7,15 @@
# Execute this in the source tree. Do not run it as a background task
# because qemu does not seem to like that much.
#
# Usage: kvm-test-1-run.sh config builddir resdir seconds qemu-args boot_args
# Usage: kvm-test-1-run.sh config builddir resdir seconds qemu-args boot_args_in
#
# qemu-args defaults to "-enable-kvm -nographic", along with arguments
# specifying the number of CPUs and other options
# generated from the underlying CPU architecture.
# boot_args defaults to value returned by the per_version_boot_params
# boot_args_in defaults to value returned by the per_version_boot_params
# shell function.
#
# Anything you specify for either qemu-args or boot_args is appended to
# Anything you specify for either qemu-args or boot_args_in is appended to
# the default values. The "-smp" value is deduced from the contents of
# the config fragment.
#
@ -134,7 +134,7 @@ do
done
seconds=$4
qemu_args=$5
boot_args=$6
boot_args_in=$6
if test -z "$TORTURE_BUILDONLY"
then
@ -144,7 +144,7 @@ fi
# Generate -smp qemu argument.
qemu_args="-enable-kvm -nographic $qemu_args"
cpu_count=`configNR_CPUS.sh $resdir/ConfigFragment`
cpu_count=`configfrag_boot_cpus "$boot_args" "$config_template" "$cpu_count"`
cpu_count=`configfrag_boot_cpus "$boot_args_in" "$config_template" "$cpu_count"`
if test "$cpu_count" -gt "$TORTURE_ALLOTED_CPUS"
then
echo CPU count limited from $cpu_count to $TORTURE_ALLOTED_CPUS | tee -a $resdir/Warnings
@ -160,13 +160,45 @@ qemu_args="$qemu_args `identify_qemu_args "$QEMU" "$resdir/console.log"`"
qemu_append="`identify_qemu_append "$QEMU"`"
# Pull in Kconfig-fragment boot parameters
boot_args="`configfrag_boot_params "$boot_args" "$config_template"`"
boot_args="`configfrag_boot_params "$boot_args_in" "$config_template"`"
# Generate kernel-version-specific boot parameters
boot_args="`per_version_boot_params "$boot_args" $resdir/.config $seconds`"
if test -n "$TORTURE_BOOT_GDB_ARG"
then
boot_args="$boot_args $TORTURE_BOOT_GDB_ARG"
fi
# Give bare-metal advice
modprobe_args="`echo $boot_args | tr -s ' ' '\012' | grep "^$TORTURE_MOD\." | sed -e "s/$TORTURE_MOD\.//g"`"
kboot_args="`echo $boot_args | tr -s ' ' '\012' | grep -v "^$TORTURE_MOD\."`"
testid_txt="`dirname $resdir`/testid.txt"
touch $resdir/bare-metal
echo To run this scenario on bare metal: >> $resdir/bare-metal
echo >> $resdir/bare-metal
echo " 1." Set your bare-metal build tree to the state shown in this file: >> $resdir/bare-metal
echo " " $testid_txt >> $resdir/bare-metal
echo " 2." Update your bare-metal build tree"'"s .config based on this file: >> $resdir/bare-metal
echo " " $resdir/ConfigFragment >> $resdir/bare-metal
echo " 3." Make the bare-metal kernel"'"s build system aware of your .config updates: >> $resdir/bare-metal
echo " " $ 'yes "" | make oldconfig' >> $resdir/bare-metal
echo " 4." Build your bare-metal kernel. >> $resdir/bare-metal
echo " 5." Boot your bare-metal kernel with the following parameters: >> $resdir/bare-metal
echo " " $kboot_args >> $resdir/bare-metal
echo " 6." Start the test with the following command: >> $resdir/bare-metal
echo " " $ modprobe $TORTURE_MOD $modprobe_args >> $resdir/bare-metal
echo " 7." After some time, end the test with the following command: >> $resdir/bare-metal
echo " " $ rmmod $TORTURE_MOD >> $resdir/bare-metal
echo " 8." Copy your bare-metal kernel"'"s .config file, overwriting this file: >> $resdir/bare-metal
echo " " $resdir/.config >> $resdir/bare-metal
echo " 9." Copy the console output from just before the modprobe to just after >> $resdir/bare-metal
echo " " the rmmod into this file: >> $resdir/bare-metal
echo " " $resdir/console.log >> $resdir/bare-metal
echo "10." Check for runtime errors using the following command: >> $resdir/bare-metal
echo " " $ tools/testing/selftests/rcutorture/bin/kvm-recheck.sh `dirname $resdir` >> $resdir/bare-metal
echo >> $resdir/bare-metal
echo Some of the above steps may be skipped if you build your bare-metal >> $resdir/bare-metal
echo kernel here: `head -n 1 $testid_txt | sed -e 's/^Build directory: //'` >> $resdir/bare-metal
echo $QEMU $qemu_args -m $TORTURE_QEMU_MEM -kernel $KERNEL -append \"$qemu_append $boot_args\" $TORTURE_QEMU_GDB_ARG > $resdir/qemu-cmd
echo "# TORTURE_SHUTDOWN_GRACE=$TORTURE_SHUTDOWN_GRACE" >> $resdir/qemu-cmd
echo "# seconds=$seconds" >> $resdir/qemu-cmd

4
tools/testing/selftests/rcutorture/bin/kvm.sh
View File

@ -29,6 +29,7 @@ PATH=${KVM}/bin:$PATH; export PATH
TORTURE_ALLOTED_CPUS="`identify_qemu_vcpus`"
TORTURE_DEFCONFIG=defconfig
TORTURE_BOOT_IMAGE=""
TORTURE_BUILDONLY=
TORTURE_INITRD="$KVM/initrd"; export TORTURE_INITRD
TORTURE_KCONFIG_ARG=""
TORTURE_KCONFIG_GDB_ARG=""
@ -40,6 +41,7 @@ TORTURE_KMAKE_ARG=""
TORTURE_QEMU_MEM=512
TORTURE_SHUTDOWN_GRACE=180
TORTURE_SUITE=rcu
TORTURE_MOD=rcutorture
TORTURE_TRUST_MAKE=""
resdir=""
configs=""
@ -215,6 +217,7 @@ do
--torture)
checkarg --torture "(suite name)" "$#" "$2" '^\(lock\|rcu\|rcuscale\|refscale\|scf\)$' '^--'
TORTURE_SUITE=$2
TORTURE_MOD="`echo $TORTURE_SUITE | sed -e 's/^\(lock\|rcu\|scf\)$/\1torture/'`"
shift
if test "$TORTURE_SUITE" = rcuscale || test "$TORTURE_SUITE" = refscale
then
@ -381,6 +384,7 @@ TORTURE_QEMU_GDB_ARG="$TORTURE_QEMU_GDB_ARG"; export TORTURE_QEMU_GDB_ARG
TORTURE_KCONFIG_KASAN_ARG="$TORTURE_KCONFIG_KASAN_ARG"; export TORTURE_KCONFIG_KASAN_ARG
TORTURE_KCONFIG_KCSAN_ARG="$TORTURE_KCONFIG_KCSAN_ARG"; export TORTURE_KCONFIG_KCSAN_ARG
TORTURE_KMAKE_ARG="$TORTURE_KMAKE_ARG"; export TORTURE_KMAKE_ARG
TORTURE_MOD="$TORTURE_MOD"; export TORTURE_MOD
TORTURE_QEMU_CMD="$TORTURE_QEMU_CMD"; export TORTURE_QEMU_CMD
TORTURE_QEMU_INTERACTIVE="$TORTURE_QEMU_INTERACTIVE"; export TORTURE_QEMU_INTERACTIVE
TORTURE_QEMU_MAC="$TORTURE_QEMU_MAC"; export TORTURE_QEMU_MAC