Add a regression testing for loop device. when an unbound device be close that take too long time. kernel will consume serveral orders of magnitude more wall time than it does for a mounted device.
Signed-off-by: James Wang <jnw...@suse.com> --- tests/loop/002 | 63 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ tests/loop/002.out | 2 ++ 2 files changed, 65 insertions(+) create mode 100755 tests/loop/002 create mode 100644 tests/loop/002.out diff --git a/tests/loop/002 b/tests/loop/002 new file mode 100755 index 0000000..ef69729 --- /dev/null +++ b/tests/loop/002 @@ -0,0 +1,63 @@ +#!/bin/bash +# +# Test if close()ing a unbound loop device is too slow +# Copyright (C) 2017 James Wang <jnw...@suse.com> +# +# This program is free software: you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation, either version 3 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program. If not, see <http://www.gnu.org/licenses/>. + +DESCRIPTION="Test if close()ing a unbound loop device is too slow" + +QUICK=1 + +run_test() { + TIMEFORMAT='%5R' + time { + for ((i=0;i<200;i++)); do dd if=/dev/loop0 of=/dev/null bs=512 count=1 >/dev/null 2>&1; done + } +} +clean_up() { + if lsmod | grep loop >/dev/null 2>&1; then + if ! rmmod loop;then + return 2; + fi + fi +} + +prepare() { + modprobe loop max_loop=1 +} + + +test() { + echo "Running ${TEST_NAME}" + + clean_up + prepare + SECONDS=0 + run_test >/dev/null 2>&1 + DURATION=${SECONDS} + + clean_up + if ! clean_up; then + echo "Test complete" + return 2 + fi + echo "Test complete" + if [[ "${DURATION}" -gt 1 ]]; then + echo "test took too long ($URATION seconds)" + return 1 + else + return 0 + fi +} diff --git a/tests/loop/002.out b/tests/loop/002.out new file mode 100644 index 0000000..5c34a37 --- /dev/null +++ b/tests/loop/002.out @@ -0,0 +1,2 @@ +Running loop/002 +Test complete -- 2.12.3
