tools/testing/selftests/zram/zram01.sh

   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
  20 TCID="zram01"
  21 ERR_CODE=0
  22
  23 . ./zram_lib.sh
  24
  25 # Test will create the following number of zram devices:
  26 dev_num=1
  27 # This is a list of parameters for zram devices.
  28 # Number of items must be equal to 'dev_num' parameter.
  29 zram_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.
  38 zram_sizes="2097152" # 2MB
  39 zram_mem_limits="2M"
  40 zram_filesystems="ext4"
  41 zram_algs="lzo"
  42
  43 zram_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
  82 check_prereqs
  83 zram_load
  84 zram_max_streams
  85 zram_compress_alg
  86 zram_set_disksizes
  87 zram_set_memlimit
  88 zram_makefs
  89 zram_mount
  90
  91 zram_fill_fs
  92 zram_cleanup
  93 zram_unload
  94
  95 if [ $ERR_CODE -ne 0 ]; then
  96         echo "$TCID : [FAIL]"
  97 else
  98         echo "$TCID : [PASS]"
  99 fi