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torture: Make kvm-test-1-run-qemu.sh apply affinity

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This commit causes the kvm-test-1-run-qemu.sh script to check the
TORTURE_AFFINITY environment variable and to add "taskset" commands to
the qemu-cmd file.  The first "taskset" command is applied only if the
TORTURE_AFFINITY environment variable is a non-empty string, and this
command pins the current scenario's guest OS to the specified CPUs.
The second "taskset" command reports the guest OS's affinity in a new
"qemu-affinity" file.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney 2021-07-07 18:01:29 -07:00
parent 8220a11849
commit bdf5ca1201
1 changed files with 10 additions and 3 deletions
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13
tools/testing/selftests/rcutorture/bin/kvm-test-1-run-qemu.sh
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@ -39,9 +39,16 @@ echo ' ---' `date`: Starting kernel, PID $$
grep '^#' $resdir/qemu-cmd | sed -e 's/^# //' > $T/qemu-cmd-settings
. $T/qemu-cmd-settings
# Decorate qemu-cmd with redirection, backgrounding, and PID capture
sed -e 's/^[^#].*$/& 2>\&1 \&/' < $resdir/qemu-cmd > $T/qemu-cmd
echo 'echo $! > $resdir/qemu_pid' >> $T/qemu-cmd
# Decorate qemu-cmd with affinity, redirection, backgrounding, and PID capture
taskset_command=
if test -n "$TORTURE_AFFINITY"
then
taskset_command="taskset -c $TORTURE_AFFINITY "
fi
sed -e 's/^[^#].*$/'"$taskset_command"'& 2>\&1 \&/' < $resdir/qemu-cmd > $T/qemu-cmd
echo 'qemu_pid=$!' >> $T/qemu-cmd
echo 'echo $qemu_pid > $resdir/qemu_pid' >> $T/qemu-cmd
echo 'taskset -c -p $qemu_pid > $resdir/qemu-affinity' >> $T/qemu-cmd
# In case qemu refuses to run...
echo "NOTE: $QEMU either did not run or was interactive" > $resdir/console.log