2 # Copyright (c) 2015 Oracle and/or its affiliates. All Rights Reserved.
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.
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.
14 # Test creates several zram devices with different filesystems on them.
15 # It fills each device with zeros and checks that compression works.
17 # Author: Alexey Kodanev <alexey.kodanev@oracle.com>
18 # Modified: Naresh Kamboju <naresh.kamboju@linaro.org>
25 # Test will create the following number of zram devices:
27 # This is a list of parameters for zram devices.
28 # Number of items must be equal to 'dev_num' parameter.
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.
38 zram_sizes="2097152" # 2MB
40 zram_filesystems="ext4"
45 for i in $(seq $dev_start $dev_end); do
49 dd conv=notrunc if=/dev/zero of=zram${i}/file \
50 oflag=append count=1 bs=1024 status=none \
51 > /dev/null 2>&1 || break
54 echo "zram$i can be filled with '$b' KB"
56 local mem_used_total=`awk '{print $3}' "/sys/block/zram$i/mm_stat"`
57 local v=$((100 * 1024 * $b / $mem_used_total))
58 if [ "$v" -lt 100 ]; then
59 echo "FAIL compression ratio: 0.$v:1"
64 echo "zram compression ratio: $(echo "scale=2; $v / 100 " | bc):1: OK"
80 if [ $ERR_CODE -ne 0 ]; then