#!/bin/bash # SPDX-License-Identifier: GPL-2.0-or-later # Copyright (c) 2015 Oracle and/or its affiliates. All Rights Reserved. # # Test creates several zram devices with different filesystems on them. # It fills each device with zeros and checks that compression works. # # Author: Alexey Kodanev <alexey.kodanev@oracle.com> # Modified: Naresh Kamboju <naresh.kamboju@linaro.org>
TCID="zram01"
ERR_CODE=0
. ./zram_lib.sh
# Test will create the following number of zram devices:
dev_num=1 # This is a list of parameters for zram devices. # Number of items must be equal to 'dev_num' parameter.
zram_max_streams="2"
# The zram sysfs node 'disksize' value can be either in bytes, # or you can use mem suffixes. But in some old kernels, mem # suffixes are not supported, for example, in RHEL6.6GA's kernel # layer, it uses strict_strtoull() to parse disksize which does # not support mem suffixes, in some newer kernels, they use # memparse() which supports mem suffixes. So here we just use # bytes to make sure everything works correctly.
zram_sizes="2097152"# 2MB
zram_mem_limits="2M"
zram_filesystems="ext4"
zram_algs="lzo"
zram_fill_fs()
{ for i in $(seq $dev_start $dev_end); do echo"fill zram$i..."
local b=0 while [ true ]; do
dd conv=notrunc if=/dev/zero of=zram${i}/file \
oflag=append count=1 bs=1024 status=none \
> /dev/null 2>&1 || break
b=$(($b + 1)) done echo"zram$i can be filled with '$b' KB"
local mem_used_total=`awk '{print $3}'"/sys/block/zram$i/mm_stat"`
local v=$((100 * 1024 * $b / $mem_used_total)) if [ "$v" -lt 100 ]; then echo"FAIL compression ratio: 0.$v:1"
ERR_CODE=-1
return fi
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