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236918d3e9
Add a new test test_generic_12 which: - sets up a ublk server with per_io_tasks and a different number of ublk server threads and ublk_queues. This is possible now that these objects are decoupled - runs some I/O load from a single CPU - verifies that all the ublk server threads handle some I/O Before this changeset, this test fails, since I/O issued from one CPU is always handled by the one ublk server thread. After this changeset, the test passes. In the future, the last check above may be strengthened to "verify that all ublk server threads handle the same amount of I/O." However, this requires some adjustments/bugfixes to tag allocation, so this work is postponed to a followup. Signed-off-by: Uday Shankar <ushankar@purestorage.com> Reviewed-by: Ming Lei <ming.lei@redhat.com> Link: https://lore.kernel.org/r/20250529-ublk_task_per_io-v8-7-e9d3b119336a@purestorage.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
56 lines
1.4 KiB
Bash
Executable File
56 lines
1.4 KiB
Bash
Executable File
#!/bin/bash
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# SPDX-License-Identifier: GPL-2.0
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. "$(cd "$(dirname "$0")" && pwd)"/test_common.sh
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TID="generic_12"
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ERR_CODE=0
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if ! _have_program bpftrace; then
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exit "$UBLK_SKIP_CODE"
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fi
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_prep_test "null" "do imbalanced load, it should be balanced over I/O threads"
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NTHREADS=6
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dev_id=$(_add_ublk_dev -t null -q 4 -d 16 --nthreads $NTHREADS --per_io_tasks)
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_check_add_dev $TID $?
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dev_t=$(_get_disk_dev_t "$dev_id")
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bpftrace trace/count_ios_per_tid.bt "$dev_t" > "$UBLK_TMP" 2>&1 &
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btrace_pid=$!
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sleep 2
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if ! kill -0 "$btrace_pid" > /dev/null 2>&1; then
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_cleanup_test "null"
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exit "$UBLK_SKIP_CODE"
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fi
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# do imbalanced I/O on the ublk device
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# pin to cpu 0 to prevent migration/only target one queue
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fio --name=write_seq \
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--filename=/dev/ublkb"${dev_id}" \
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--ioengine=libaio --iodepth=16 \
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--rw=write \
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--size=512M \
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--direct=1 \
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--bs=4k \
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--cpus_allowed=0 > /dev/null 2>&1
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ERR_CODE=$?
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kill "$btrace_pid"
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wait
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# check that every task handles some I/O, even though all I/O was issued
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# from a single CPU. when ublk gets support for round-robin tag
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# allocation, this check can be strengthened to assert that every thread
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# handles the same number of I/Os
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NR_THREADS_THAT_HANDLED_IO=$(grep -c '@' ${UBLK_TMP})
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if [[ $NR_THREADS_THAT_HANDLED_IO -ne $NTHREADS ]]; then
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echo "only $NR_THREADS_THAT_HANDLED_IO handled I/O! expected $NTHREADS"
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cat "$UBLK_TMP"
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ERR_CODE=255
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fi
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_cleanup_test "null"
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_show_result $TID $ERR_CODE
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