#!/bin/sh # Copyright (c) 2015 Oracle and/or its affiliates. All Rights Reserved. # # This program is free software; you can redistribute it and/or # modify it under the terms of the GNU General Public License as # published by the Free Software Foundation; either version 2 of # the License, or (at your option) any later version. # # This program is distributed in the hope that it would be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program; if not, write the Free Software Foundation, # Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA # # 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> TCID="zram01" TST_TOTAL=8 . test.sh . zram_lib.sh # Test will create the following number of zram devices: dev_num=4 # This is a list of parameters for zram devices. # Number of items must be equal to 'dev_num' parameter. zram_max_streams="2 3 5 8" FS_SIZE="402653184" FS_TYPE="btrfs" RAM_SIZE=$(awk '/MemTotal:/ {print $2}' /proc/meminfo) if [ "$RAM_SIZE" -lt 1048576 ]; then tst_res TINFO "Not enough space for Btrfs" FS_SIZE="26214400" FS_TYPE="ext2" fi # 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="26214400 26214400 26214400 $FS_SIZE" zram_mem_limits="25M 25M 25M $((FS_SIZE/1024/1024))M" zram_filesystems="ext3 ext4 xfs $FS_TYPE" zram_algs="lzo lzo lzo lzo" TST_CLEANUP="zram_cleanup" zram_fill_fs() { tst_test_cmds dd free awk local mem_free0=$(free -m | awk 'NR==2 {print $4}') for i in $(seq 0 $(($dev_num - 1))); do tst_resm TINFO "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 tst_resm TINFO "zram$i can be filled with '$b' KB" done local mem_free1=$(free -m | awk 'NR==2 {print $4}') local used_mem=$(($mem_free0 - $mem_free1)) local total_size=0 for sm in $zram_sizes; do local s=$(echo $sm | sed 's/M//') total_size=$(($total_size + $s)) done tst_resm TINFO "zram used ${used_mem}M, zram disk sizes ${total_size}M" local v=$((100 * $total_size / $used_mem)) if [ "$v" -lt 100 ]; then tst_resm TFAIL "compression ratio: 0.$v:1" return fi tst_resm TPASS "compression ratio: $(echo "scale=2; $v / 100 " | bc):1" } zram_load zram_max_streams zram_compress_alg zram_set_disksizes zram_set_memlimit zram_makefs zram_mount zram_fill_fs tst_exit