tools/testing/selftests/zram/zram01.sh

   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         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
  73 check_prereqs
  74 zram_load
  75 zram_max_streams
  76 zram_compress_alg
  77 zram_set_disksizes
  78 zram_set_memlimit
  79 zram_makefs
  80 zram_mount
  81
  82 zram_fill_fs
  83 zram_cleanup
  84 zram_unload
  85
  86 if [ $ERR_CODE -ne 0 ]; then
  87         echo "$TCID : [FAIL]"
  88 else
  89         echo "$TCID : [PASS]"
  90 fi