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#!/bin/bash # SPDX-License-Identifier: GPL-2.0-or-later # Copyright (c) 2015 Oracle and/or its affiliates. All Rights Reserved. # # Test creates several zram devices with different filesystems on them. # It fills each device with zeros and checks that compression works. # # Author: Alexey Kodanev <alexey.kodanev@oracle.com> # Modified: Naresh Kamboju <naresh.kamboju@linaro.org> TCID="zram01" ERR_CODE=0 . ./zram_lib.sh # Test will create the following number of zram devices: dev_num=1 # This is a list of parameters for zram devices. # Number of items must be equal to 'dev_num' parameter. zram_max_streams="2" # The zram sysfs node 'disksize' value can be either in bytes, # or you can use mem suffixes. But in some old kernels, mem # suffixes are not supported, for example, in RHEL6.6GA's kernel # layer, it uses strict_strtoull() to parse disksize which does # not support mem suffixes, in some newer kernels, they use # memparse() which supports mem suffixes. So here we just use # bytes to make sure everything works correctly. zram_sizes="2097152" # 2MB zram_mem_limits="2M" zram_filesystems="ext4" zram_algs="lzo" zram_fill_fs() { for i in $(seq $dev_start $dev_end); do echo "fill zram$i..." local b=0 while [ true ]; do dd conv=notrunc if=/dev/zero of=zram${i}/file \ oflag=append count=1 bs=1024 status=none \ > /dev/null 2>&1 || break b=$(($b + 1)) done echo "zram$i can be filled with '$b' KB" local mem_used_total=`awk '{print $3}' "/sys/block/zram$i/mm_stat"` local v=$((100 * 1024 * $b / $mem_used_total)) if [ "$v" -lt 100 ]; then echo "FAIL compression ratio: 0.$v:1" ERR_CODE=-1 return fi echo "zram compression ratio: $(echo "scale=2; $v / 100 " | bc):1: OK" done } check_prereqs zram_load zram_max_streams zram_compress_alg zram_set_disksizes zram_set_memlimit zram_makefs zram_mount zram_fill_fs zram_cleanup if [ $ERR_CODE -ne 0 ]; then echo "$TCID : [FAIL]" else echo "$TCID : [PASS]" fi
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