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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 # The zram sysfs node 'disksize' value can be either in bytes,
     36 # or you can use mem suffixes. But in some old kernels, mem
     37 # suffixes are not supported, for example, in RHEL6.6GA's kernel
     38 # layer, it uses strict_strtoull() to parse disksize which does
     39 # not support mem suffixes, in some newer kernels, they use
     40 # memparse() which supports mem suffixes. So here we just use
     41 # bytes to make sure everything works correctly.
     42 zram_sizes="26214400 26214400 26214400 26214400" # 25MB
     43 zram_mem_limits="25M 25M 25M 25M"
     44 zram_filesystems="ext3 ext4 xfs btrfs"
     45 zram_algs="lzo lzo lzo lzo"
     46 
     47 TST_CLEANUP="zram_cleanup"
     48 
     49 zram_fill_fs()
     50 {
     51 	tst_check_cmds dd free awk
     52 	local mem_free0=$(free -m | awk 'NR==2 {print $4}')
     53 
     54 	for i in $(seq 0 $(($dev_num - 1))); do
     55 		tst_resm TINFO "fill zram$i..."
     56 		local b=0
     57 		while ((1)); do
     58 			dd conv=notrunc if=/dev/zero of=zram${i}/file \
     59 				oflag=append count=1 bs=1024 status=none \
     60 				> /dev/null 2>&1 || break
     61 			b=$(($b + 1))
     62 		done
     63 		tst_resm TINFO "zram$i can be filled with '$b' KB"
     64 	done
     65 
     66 	local mem_free1=$(free -m | awk 'NR==2 {print $4}')
     67 	local used_mem=$(($mem_free0 - $mem_free1))
     68 
     69 	local total_size=0
     70 	for sm in $zram_sizes; do
     71 		local s=$(echo $sm | sed 's/M//')
     72 		total_size=$(($total_size + $s))
     73 	done
     74 
     75 	tst_resm TINFO "zram used ${used_mem}M, zram disk sizes ${total_size}M"
     76 
     77 	local v=$((100 * $total_size / $used_mem))
     78 
     79 	if [ "$v" -lt 100 ]; then
     80 		tst_resm TFAIL "compression ratio: 0.$v:1"
     81 		return
     82 	fi
     83 
     84 	tst_resm TPASS "compression ratio: $(echo "scale=2; $v / 100 " | bc):1"
     85 }
     86 
     87 zram_load
     88 zram_max_streams
     89 zram_compress_alg
     90 zram_set_disksizes
     91 zram_set_memlimit
     92 zram_makefs
     93 zram_mount
     94 
     95 zram_fill_fs
     96 
     97 tst_exit
     98