73 lines
1.7 KiB
Bash
Executable File
73 lines
1.7 KiB
Bash
Executable File
#!/bin/bash
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# SPDX-License-Identifier: GPL-2.0
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# Test: shmem_zc with hugetlbfs buffer on null target
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#
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# kublk and fio both mmap the same hugetlbfs file (MAP_SHARED),
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# so they share physical pages. The kernel PFN match enables
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# zero-copy I/O without socket-based fd passing.
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. "$(cd "$(dirname "$0")" && pwd)"/test_common.sh
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ERR_CODE=0
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_prep_test "shmem_zc" "null target hugetlbfs shmem zero-copy test"
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if ! _have_program fio; then
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echo "SKIP: fio not available"
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exit "$UBLK_SKIP_CODE"
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fi
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if ! grep -q hugetlbfs /proc/filesystems; then
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echo "SKIP: hugetlbfs not supported"
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exit "$UBLK_SKIP_CODE"
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fi
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# Allocate hugepages
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OLD_NR_HP=$(cat /proc/sys/vm/nr_hugepages)
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echo 10 > /proc/sys/vm/nr_hugepages
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NR_HP=$(cat /proc/sys/vm/nr_hugepages)
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if [ "$NR_HP" -lt 2 ]; then
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echo "SKIP: cannot allocate hugepages"
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echo "$OLD_NR_HP" > /proc/sys/vm/nr_hugepages
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exit "$UBLK_SKIP_CODE"
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fi
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# Mount hugetlbfs
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HTLB_MNT=$(mktemp -d "${UBLK_TEST_DIR}/htlb_mnt_XXXXXX")
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if ! mount -t hugetlbfs none "$HTLB_MNT"; then
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echo "SKIP: cannot mount hugetlbfs"
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rmdir "$HTLB_MNT"
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echo "$OLD_NR_HP" > /proc/sys/vm/nr_hugepages
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exit "$UBLK_SKIP_CODE"
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fi
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HTLB_FILE="$HTLB_MNT/ublk_buf"
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fallocate -l 4M "$HTLB_FILE"
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dev_id=$(_add_ublk_dev -t null --shmem_zc --htlb "$HTLB_FILE")
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_check_add_dev $TID $?
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fio --name=htlb_zc \
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--filename=/dev/ublkb"${dev_id}" \
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--ioengine=io_uring \
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--rw=randwrite \
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--direct=1 \
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--bs=4k \
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--size=4M \
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--iodepth=32 \
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--mem=mmaphuge:"$HTLB_FILE" \
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> /dev/null 2>&1
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ERR_CODE=$?
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# Delete device first so daemon releases the htlb mmap
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_ublk_del_dev "${dev_id}"
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rm -f "$HTLB_FILE"
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umount "$HTLB_MNT"
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rmdir "$HTLB_MNT"
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echo "$OLD_NR_HP" > /proc/sys/vm/nr_hugepages
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_cleanup_test
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_show_result $TID $ERR_CODE
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