1#!/bin/bash 2# Copyright (c) 2015 Oracle and/or its affiliates. All Rights Reserved. 3# 4# This program is free software; you can redistribute it and/or 5# modify it under the terms of the GNU General Public License as 6# published by the Free Software Foundation; either version 2 of 7# the License, or (at your option) any later version. 8# 9# This program is distributed in the hope that it would be useful, 10# but WITHOUT ANY WARRANTY; without even the implied warranty of 11# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12# GNU General Public License for more details. 13# 14# Test creates several zram devices with different filesystems on them. 15# It fills each device with zeros and checks that compression works. 16# 17# Author: Alexey Kodanev <alexey.kodanev@oracle.com> 18# Modified: Naresh Kamboju <naresh.kamboju@linaro.org> 19 20TCID="zram01" 21ERR_CODE=0 22 23. ./zram_lib.sh 24 25# Test will create the following number of zram devices: 26dev_num=1 27# This is a list of parameters for zram devices. 28# Number of items must be equal to 'dev_num' parameter. 29zram_max_streams="2" 30 31# The zram sysfs node 'disksize' value can be either in bytes, 32# or you can use mem suffixes. But in some old kernels, mem 33# suffixes are not supported, for example, in RHEL6.6GA's kernel 34# layer, it uses strict_strtoull() to parse disksize which does 35# not support mem suffixes, in some newer kernels, they use 36# memparse() which supports mem suffixes. So here we just use 37# bytes to make sure everything works correctly. 38zram_sizes="2097152" # 2MB 39zram_mem_limits="2M" 40zram_filesystems="ext4" 41zram_algs="lzo" 42 43zram_fill_fs() 44{ 45 local mem_free0=$(free -m | awk 'NR==2 {print $4}') 46 47 for i in $(seq 0 $(($dev_num - 1))); do 48 echo "fill zram$i..." 49 local b=0 50 while [ true ]; do 51 dd conv=notrunc if=/dev/zero of=zram${i}/file \ 52 oflag=append count=1 bs=1024 status=none \ 53 > /dev/null 2>&1 || break 54 b=$(($b + 1)) 55 done 56 echo "zram$i can be filled with '$b' KB" 57 done 58 59 local mem_free1=$(free -m | awk 'NR==2 {print $4}') 60 local used_mem=$(($mem_free0 - $mem_free1)) 61 62 local total_size=0 63 for sm in $zram_sizes; do 64 local s=$(echo $sm | sed 's/M//') 65 total_size=$(($total_size + $s)) 66 done 67 68 echo "zram used ${used_mem}M, zram disk sizes ${total_size}M" 69 70 local v=$((100 * $total_size / $used_mem)) 71 72 if [ "$v" -lt 100 ]; then 73 echo "FAIL compression ratio: 0.$v:1" 74 ERR_CODE=-1 75 zram_cleanup 76 return 77 fi 78 79 echo "zram compression ratio: $(echo "scale=2; $v / 100 " | bc):1: OK" 80} 81 82check_prereqs 83zram_load 84zram_max_streams 85zram_compress_alg 86zram_set_disksizes 87zram_set_memlimit 88zram_makefs 89zram_mount 90 91zram_fill_fs 92zram_cleanup 93zram_unload 94 95if [ $ERR_CODE -ne 0 ]; then 96 echo "$TCID : [FAIL]" 97else 98 echo "$TCID : [PASS]" 99fi 100