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 local mem_free0=$(free -m | awk 'NR==2 {print $4}') 37 38 for i in $(seq 0 $(($dev_num - 1))); do 39 echo "fill zram$i..." 40 local b=0 41 while [ true ]; do 42 dd conv=notrunc if=/dev/zero of=zram${i}/file \ 43 oflag=append count=1 bs=1024 status=none \ 44 > /dev/null 2>&1 || break 45 b=$(($b + 1)) 46 done 47 echo "zram$i can be filled with '$b' KB" 48 done 49 50 local mem_free1=$(free -m | awk 'NR==2 {print $4}') 51 local used_mem=$(($mem_free0 - $mem_free1)) 52 53 local total_size=0 54 for sm in $zram_sizes; do 55 local s=$(echo $sm | sed 's/M//') 56 total_size=$(($total_size + $s)) 57 done 58 59 echo "zram used ${used_mem}M, zram disk sizes ${total_size}M" 60 61 local v=$((100 * $total_size / $used_mem)) 62 63 if [ "$v" -lt 100 ]; then 64 echo "FAIL compression ratio: 0.$v:1" 65 ERR_CODE=-1 66 zram_cleanup 67 return 68 fi 69 70 echo "zram compression ratio: $(echo "scale=2; $v / 100 " | bc):1: OK" 71} 72 73check_prereqs 74zram_load 75zram_max_streams 76zram_compress_alg 77zram_set_disksizes 78zram_set_memlimit 79zram_makefs 80zram_mount 81 82zram_fill_fs 83zram_cleanup 84zram_unload 85 86if [ $ERR_CODE -ne 0 ]; then 87 echo "$TCID : [FAIL]" 88else 89 echo "$TCID : [PASS]" 90fi 91