1#!/bin/bash 2# SPDX-License-Identifier: GPL-2.0-or-later 3# Copyright (c) 2015 Oracle and/or its affiliates. All Rights Reserved. 4# 5# Test creates several zram devices with different filesystems on them. 6# It fills each device with zeros and checks that compression works. 7# 8# Author: Alexey Kodanev <alexey.kodanev@oracle.com> 9# Modified: Naresh Kamboju <naresh.kamboju@linaro.org> 10 11TCID="zram01" 12ERR_CODE=0 13 14. ./zram_lib.sh 15 16# Test will create the following number of zram devices: 17dev_num=1 18# This is a list of parameters for zram devices. 19# Number of items must be equal to 'dev_num' parameter. 20zram_max_streams="2" 21 22# The zram sysfs node 'disksize' value can be either in bytes, 23# or you can use mem suffixes. But in some old kernels, mem 24# suffixes are not supported, for example, in RHEL6.6GA's kernel 25# layer, it uses strict_strtoull() to parse disksize which does 26# not support mem suffixes, in some newer kernels, they use 27# memparse() which supports mem suffixes. So here we just use 28# bytes to make sure everything works correctly. 29zram_sizes="2097152" # 2MB 30zram_mem_limits="2M" 31zram_filesystems="ext4" 32zram_algs="lzo" 33 34zram_fill_fs() 35{ 36 for i in $(seq $dev_start $dev_end); do 37 echo "fill zram$i..." 38 local b=0 39 while [ true ]; do 40 dd conv=notrunc if=/dev/zero of=zram${i}/file \ 41 oflag=append count=1 bs=1024 status=none \ 42 > /dev/null 2>&1 || break 43 b=$(($b + 1)) 44 done 45 echo "zram$i can be filled with '$b' KB" 46 47 local mem_used_total=`awk '{print $3}' "/sys/block/zram$i/mm_stat"` 48 local v=$((100 * 1024 * $b / $mem_used_total)) 49 if [ "$v" -lt 100 ]; then 50 echo "FAIL compression ratio: 0.$v:1" 51 ERR_CODE=-1 52 return 53 fi 54 55 echo "zram compression ratio: $(echo "scale=2; $v / 100 " | bc):1: OK" 56 done 57} 58 59check_prereqs 60zram_load 61zram_max_streams 62zram_compress_alg 63zram_set_disksizes 64zram_set_memlimit 65zram_makefs 66zram_mount 67 68zram_fill_fs 69zram_cleanup 70 71if [ $ERR_CODE -ne 0 ]; then 72 echo "$TCID : [FAIL]" 73else 74 echo "$TCID : [PASS]" 75fi 76