| #!/bin/bash |
| # SPDX-License-Identifier: GPL-2.0 |
| |
| . "$(cd "$(dirname "$0")" && pwd)"/test_common.sh |
| |
| ERR_CODE=0 |
| |
| if ! _have_program bpftrace; then |
| exit "$UBLK_SKIP_CODE" |
| fi |
| |
| if ! _have_program fio; then |
| exit "$UBLK_SKIP_CODE" |
| fi |
| |
| _prep_test "null" "ublk dispatch won't reorder IO for MQ" |
| |
| dev_id=$(_add_ublk_dev -t null -q 2) |
| _check_add_dev $TID $? |
| |
| dev_t=$(_get_disk_dev_t "$dev_id") |
| bpftrace trace/seq_io.bt "$dev_t" "W" 1 > "$UBLK_TMP" 2>&1 & |
| btrace_pid=$! |
| |
| # Wait for bpftrace probes to be attached (BEGIN block prints BPFTRACE_READY) |
| for _ in $(seq 100); do |
| grep -q "BPFTRACE_READY" "$UBLK_TMP" 2>/dev/null && break |
| sleep 0.1 |
| done |
| |
| if ! kill -0 "$btrace_pid" 2>/dev/null; then |
| _cleanup_test |
| exit "$UBLK_SKIP_CODE" |
| fi |
| |
| # run fio over this ublk disk (pinned to CPU 0) |
| taskset -c 0 fio --name=write_seq \ |
| --filename=/dev/ublkb"${dev_id}" \ |
| --ioengine=libaio --iodepth=16 \ |
| --rw=write \ |
| --size=512M \ |
| --direct=1 \ |
| --bs=4k > /dev/null 2>&1 |
| ERR_CODE=$? |
| kill "$btrace_pid" |
| wait |
| |
| # Check for out-of-order completions detected by bpftrace |
| if grep -q "^out_of_order:" "$UBLK_TMP"; then |
| echo "I/O reordering detected:" |
| grep "^out_of_order:" "$UBLK_TMP" |
| ERR_CODE=255 |
| fi |
| _cleanup_test |
| _show_result $TID $ERR_CODE |
