IO request allocation may hang for ever if the allocation process migrages. This test covers the request allocation code path.
The following patch can fix this issue on linus kernel: https://marc.info/?l=linux-block&m=152671586923185&w=2 Signed-off-by: Ming Lei <ming....@redhat.com> --- tests/block/020 | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++ tests/block/020.out | 2 ++ 2 files changed, 52 insertions(+) create mode 100755 tests/block/020 create mode 100755 tests/block/020.out diff --git a/tests/block/020 b/tests/block/020 new file mode 100755 index 000000000000..b102d7f12173 --- /dev/null +++ b/tests/block/020 @@ -0,0 +1,50 @@ +#!/bin/bash +# +# Test blk-mq IO request allocation. +# +# Copyright (C) 2018 Ming Lei <ming....@redhat.com> +# +# This program is free software: you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation, either version 3 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program. If not, see <http://www.gnu.org/licenses/>. + +DESCRIPTION="check if IO req allocation may hang" +QUICK=1 + +requires() { + _have_module null_blk && _have_fio +} + +test() { + echo "Running ${TEST_NAME}" + + modprobe -r null_blk + modprobe null_blk queue_mode=2 irqmode=2 completion_nsec=2000000 \ + shared_tags=1 submit_queues=4 hw_queue_depth=1 || continue + + local scheds + # shellcheck disable=SC2207 + scheds=($(sed 's/[][]//g' /sys/block/nullb0/queue/scheduler)) + + for sched in "${scheds[@]}"; do + echo "Testing $sched" >> "$FULL" + echo "$sched" > /sys/block/nullb0/queue/scheduler + _fio_perf --bs=4k --ioengine=libaio --iodepth=1024 \ + --numjobs="$(nproc)" --rw=randread --name=async \ + --filename=/dev/nullb0 --size=1g --direct=1 \ + --runtime=10 + done + + modprobe -r null_blk + + echo "Test complete" +} diff --git a/tests/block/020.out b/tests/block/020.out new file mode 100755 index 000000000000..dcb584d22e3e --- /dev/null +++ b/tests/block/020.out @@ -0,0 +1,2 @@ +Running block/020 +Test complete -- 2.9.5
