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      1 #!/bin/sh
      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 # You should have received a copy of the GNU General Public License
     15 # along with this program; if not, write the Free Software Foundation,
     16 # Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
     17 #
     18 # Test creates several zram devices with different filesystems on them.
     19 # It fills each device with zeros and checks that compression works.
     20 #
     21 # Author: Alexey Kodanev <alexey.kodanev (at] oracle.com>
     22 
     23 TCID="zram01"
     24 TST_TOTAL=8
     25 
     26 . test.sh
     27 . zram_lib.sh
     28 
     29 # Test will create the following number of zram devices:
     30 dev_num=4
     31 # This is a list of parameters for zram devices.
     32 # Number of items must be equal to 'dev_num' parameter.
     33 zram_max_streams="2 3 5 8"
     34 
     35 FS_SIZE="402653184"
     36 FS_TYPE="btrfs"
     37 
     38 RAM_SIZE=$(awk '/MemTotal:/ {print $2}' /proc/meminfo)
     39 if [ "$RAM_SIZE" -lt 1048576 ]; then
     40 	tst_res TINFO "Not enough space for Btrfs"
     41 	FS_SIZE="26214400"
     42 	FS_TYPE="ext2"
     43 fi
     44 
     45 # The zram sysfs node 'disksize' value can be either in bytes,
     46 # or you can use mem suffixes. But in some old kernels, mem
     47 # suffixes are not supported, for example, in RHEL6.6GA's kernel
     48 # layer, it uses strict_strtoull() to parse disksize which does
     49 # not support mem suffixes, in some newer kernels, they use
     50 # memparse() which supports mem suffixes. So here we just use
     51 # bytes to make sure everything works correctly.
     52 zram_sizes="26214400 26214400 26214400 $FS_SIZE"
     53 zram_mem_limits="25M 25M 25M $((FS_SIZE/1024/1024))M"
     54 zram_filesystems="ext3 ext4 xfs $FS_TYPE"
     55 zram_algs="lzo lzo lzo lzo"
     56 
     57 TST_CLEANUP="zram_cleanup"
     58 
     59 zram_fill_fs()
     60 {
     61 	tst_check_cmds dd free awk
     62 	local mem_free0=$(free -m | awk 'NR==2 {print $4}')
     63 
     64 	for i in $(seq 0 $(($dev_num - 1))); do
     65 		tst_resm TINFO "fill zram$i..."
     66 		local b=0
     67 		while true; do
     68 			dd conv=notrunc if=/dev/zero of=zram${i}/file \
     69 				oflag=append count=1 bs=1024 status=none \
     70 				> /dev/null 2>&1 || break
     71 			b=$(($b + 1))
     72 		done
     73 		tst_resm TINFO "zram$i can be filled with '$b' KB"
     74 	done
     75 
     76 	local mem_free1=$(free -m | awk 'NR==2 {print $4}')
     77 	local used_mem=$(($mem_free0 - $mem_free1))
     78 
     79 	local total_size=0
     80 	for sm in $zram_sizes; do
     81 		local s=$(echo $sm | sed 's/M//')
     82 		total_size=$(($total_size + $s))
     83 	done
     84 
     85 	tst_resm TINFO "zram used ${used_mem}M, zram disk sizes ${total_size}M"
     86 
     87 	local v=$((100 * $total_size / $used_mem))
     88 
     89 	if [ "$v" -lt 100 ]; then
     90 		tst_resm TFAIL "compression ratio: 0.$v:1"
     91 		return
     92 	fi
     93 
     94 	tst_resm TPASS "compression ratio: $(echo "scale=2; $v / 100 " | bc):1"
     95 }
     96 
     97 zram_load
     98 zram_max_streams
     99 zram_compress_alg
    100 zram_set_disksizes
    101 zram_set_memlimit
    102 zram_makefs
    103 zram_mount
    104 zram_fill_fs
    105 
    106 tst_exit
    107