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
11 TCID="zram01"
12 ERR_CODE=0
13
14 . ./zram_lib.sh
15
16 # Test will create the following number of zram devices:
17 dev_num=1
18 # This is a list of parameters for zram devices.
19 # Number of items must be equal to 'dev_num' parameter.
20 zram_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.
29 zram_sizes="2097152" # 2MB
30 zram_mem_limits="2M"
31 zram_filesystems="ext4"
32 zram_algs="lzo"
33
34 zram_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
59 check_prereqs
60 zram_load
61 zram_max_streams
62 zram_compress_alg
63 zram_set_disksizes
64 zram_set_memlimit
65 zram_makefs
66 zram_mount
67
68 zram_fill_fs
69 zram_cleanup
70
71 if [ $ERR_CODE -ne 0 ]; then
72 echo "$TCID : [FAIL]"
73 else
74 echo "$TCID : [PASS]"
75 fi
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