Add test for covering prioritized meta IO when throttling, regression
test for commit 29390bb5661d ("blk-throttle: support prioritized processing
of metadata").
Cc: Yu Kuai <yukuai1@xxxxxxxxxxxxxxx>
Signed-off-by: Ming Lei <ming.lei@xxxxxxxxxx>
---
tests/throtl/006 | 58 ++++++++++++++++++++++++++++++++++++++++++++
tests/throtl/006.out | 4 +++
tests/throtl/rc | 19 +++++++++++++++
3 files changed, 81 insertions(+)
create mode 100755 tests/throtl/006
create mode 100644 tests/throtl/006.out
diff --git a/tests/throtl/006 b/tests/throtl/006
new file mode 100755
index 0000000..4baadaf
--- /dev/null
+++ b/tests/throtl/006
@@ -0,0 +1,58 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-3.0+
+# Copyright (C) 2025 Ming Lei
+#
+# Test prioritized meta IO when IO throttling, regression test for
+# commit 29390bb5661d ("blk-throttle: support prioritized processing of metadata")
+
+. tests/throtl/rc
+
+DESCRIPTION="test if meta IO has higher priority than data IO"
+QUICK=1
+
+requires() {
+ _have_program mkfs.ext4
+}
+
+test_meta_io() {
+ local path="$1"
+ local start_time
+ local end_time
+ local elapsed
+
+ start_time=$(date +%s.%N)
+ mkdir "${path}"/xxx
+ touch "${path}"/xxx/1
+ sync "${path}"/xxx
+
+ end_time=$(date +%s.%N)
+ elapsed=$(echo "$end_time - $start_time" | bc)
+ printf "%.0f\n" "$elapsed"
+}
+
+test() {
+ echo "Running ${TEST_NAME}"
+
+ if ! _set_up_throtl memory_backed=1; then
+ return 1;
+ fi
+
+ mkdir -p "${TMPDIR}/mnt"
+ mkfs.ext4 -E lazy_itable_init=0,lazy_journal_init=0 -F "/dev/${THROTL_DEV}" >> "$FULL" 2>&1
+ mount "/dev/${THROTL_DEV}" "${TMPDIR}/mnt" >> "$FULL" 2>&1
+
+ _throtl_set_limits wbps=$((1024 * 1024))
+ {
+ echo "$BASHPID" > "$CGROUP2_DIR/$THROTL_DIR/cgroup.procs"
+ _throtl_issue_fs_io "${TMPDIR}/mnt/test.img" write 64K 64 &
+ sleep 2
+ test_meta_io "${TMPDIR}/mnt"
+ wait
+ } &
+ wait $!
+
+ umount "${TMPDIR}/mnt" || return $?
+ _throtl_remove_limits
+ _clean_up_throtl
+ echo "Test complete"
+}
diff --git a/tests/throtl/006.out b/tests/throtl/006.out
new file mode 100644
index 0000000..8c3d176
--- /dev/null
+++ b/tests/throtl/006.out
@@ -0,0 +1,4 @@
+Running throtl/006
+0
+4
+Test complete
diff --git a/tests/throtl/rc b/tests/throtl/rc
index df54cb9..327084b 100644
--- a/tests/throtl/rc
+++ b/tests/throtl/rc
@@ -75,6 +75,25 @@ _throtl_get_max_io_size() {
cat "/sys/block/$THROTL_DEV/queue/max_sectors_kb"
}
+_throtl_issue_fs_io() {
+ local path=$1
+ local start_time
+ local end_time
+ local elapsed
+
+ start_time=$(date +%s.%N)
+
+ if [ "$2" == "read" ]; then
+ dd if="${path}" of=/dev/null bs="$3" count="$4" iflag=direct status=none
+ elif [ "$2" == "write" ]; then
+ dd of="${path}" if=/dev/zero bs="$3" count="$4" oflag=direct conv=fdatasync status=none
+ fi
+
+ end_time=$(date +%s.%N)
+ elapsed=$(echo "$end_time - $start_time" | bc)
+ printf "%.0f\n" "$elapsed"
+}
+
_throtl_issue_io() {
local start_time
local end_time
--
2.47.1
