[PATCH v2 blktests 5/5] tests/throtl: add a new test 005

[Yu Kuai <yukuai1@huaweicloud.com>]

From: Yu Kuai <yukuai3@huawei.com>

Test change config while IO is throttled, regression test for:

commit a880ae93e5b5 ("blk-throttle: fix io hung due to configuration updates")

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 tests/throtl/005     | 37 +++++++++++++++++++++++++++++++++++++
 tests/throtl/005.out |  3 +++
 2 files changed, 40 insertions(+)
 create mode 100755 tests/throtl/005
 create mode 100644 tests/throtl/005.out

diff --git a/tests/throtl/005 b/tests/throtl/005
new file mode 100755
index 0000000..5ee5e7d
--- /dev/null
+++ b/tests/throtl/005
@@ -0,0 +1,37 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-3.0+
+# Copyright (C) 2024 Yu Kuai
+#
+# Test change config while IO is throttled, regression test for
+# commit a880ae93e5b5 ("blk-throttle: fix io hung due to configuration updates")
+
+. tests/throtl/rc
+
+DESCRIPTION="change config with throttled IO"
+QUICK=1
+
+test() {
+	echo "Running ${TEST_NAME}"
+
+	if ! _set_up_test nr_devices=1; then
+		return 1;
+	fi
+
+	_set_limits wbps=$((512 * 1024))
+
+	{
+		sleep 0.1
+		_issue_io write 1M 1
+	} &
+
+	pid=$!
+	echo "$pid" > $TEST_DIR/cgroup.procs
+
+	sleep 1
+	_set_limits wbps=$((256 * 1024))
+	wait $pid
+	_remove_limits
+
+	_clean_up_test
+	echo "Test complete"
+}
diff --git a/tests/throtl/005.out b/tests/throtl/005.out
new file mode 100644
index 0000000..1d23210
--- /dev/null
+++ b/tests/throtl/005.out
@@ -0,0 +1,3 @@
+Running throtl/005
+3
+Test complete
-- 
2.39.2