ovni/test/rt/nosv/kernel-overflow.driver.sh

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target=$OVNI_TEST_BIN
# We will set our own
unset NOSV_CONFIG
unset NOSV_CONFIG_OVERRIDE
export NOSV_APPID=1
# Small kernel ring size to make execution fast
ringsize=$((64*1024))
# Each CS event pair occupies 16 bytes.
cspair=32
# How many CS event pairs fit in the ring buffer?
navail=$(($ringsize / $cspair))
# For the test, write 8 times the ring buffer
ncs=$((8 * $navail))
# Flush the kernel after overflowing the ring buffer, by writing to it twice the
# ring size
nflush=$((2 * $ringsize / $cspair))
cat > nosv.toml << EOF
instrumentation.version = "ovni"
ovni.level = 3
ovni.kernel_ringsize = ${ringsize}
EOF
# Should fail in runtime
set +e
$target $ncs $nflush 2> err.log
rc=$?
set -e
# Dump log
cat err.log
# Ensure no nOS-V warnings at runtime
if grep -c "cannot enable kernel events" err.log; then
echo "cannot enable kernel events in all threads" >&2
exit 1
fi
# Ensure it detects the error
if ! grep -c "Kernel events lost" err.log; then
echo "cannot find 'Kernel events lost' error message" >&2
exit 1
fi
if [ "$rc" == "0" ]; then
echo "program didn't failed" >&2
exit 1
fi