mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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56 lines
1.4 KiB
Bash
56 lines
1.4 KiB
Bash
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#!/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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