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01dabed205
If zram-generator package is installed and works, then we can not remove
zram module because zram swap is being used. This case needs a clean zram
environment, change this test by using hot_add/hot_remove interface. So
even zram device is being used, we still can add zram device and remove
them in cleanup.
The two interface was introduced since kernel commit 6566d1a32bf7("zram:
add dynamic device add/remove functionality") in v4.2-rc1. If kernel
supports these two interface, we use hot_add/hot_remove to slove this
problem, if not, just check whether zram is being used or built in, then
skip it on old kernel.
Signed-off-by: Yang Xu <xuyang2018.jy@fujitsu.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
75 lines
1.9 KiB
Bash
Executable file
75 lines
1.9 KiB
Bash
Executable file
#!/bin/bash
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# SPDX-License-Identifier: GPL-2.0-or-later
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# Copyright (c) 2015 Oracle and/or its affiliates. All Rights Reserved.
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#
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# Test creates several zram devices with different filesystems on them.
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# It fills each device with zeros and checks that compression works.
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#
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# Author: Alexey Kodanev <alexey.kodanev@oracle.com>
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# Modified: Naresh Kamboju <naresh.kamboju@linaro.org>
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TCID="zram01"
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ERR_CODE=0
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. ./zram_lib.sh
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# Test will create the following number of zram devices:
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dev_num=1
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# This is a list of parameters for zram devices.
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# Number of items must be equal to 'dev_num' parameter.
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zram_max_streams="2"
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# The zram sysfs node 'disksize' value can be either in bytes,
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# or you can use mem suffixes. But in some old kernels, mem
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# suffixes are not supported, for example, in RHEL6.6GA's kernel
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# layer, it uses strict_strtoull() to parse disksize which does
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# not support mem suffixes, in some newer kernels, they use
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# memparse() which supports mem suffixes. So here we just use
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# bytes to make sure everything works correctly.
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zram_sizes="2097152" # 2MB
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zram_mem_limits="2M"
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zram_filesystems="ext4"
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zram_algs="lzo"
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zram_fill_fs()
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{
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for i in $(seq $dev_start $dev_end); do
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echo "fill zram$i..."
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local b=0
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while [ true ]; do
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dd conv=notrunc if=/dev/zero of=zram${i}/file \
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oflag=append count=1 bs=1024 status=none \
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> /dev/null 2>&1 || break
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b=$(($b + 1))
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done
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echo "zram$i can be filled with '$b' KB"
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local mem_used_total=`awk '{print $3}' "/sys/block/zram$i/mm_stat"`
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local v=$((100 * 1024 * $b / $mem_used_total))
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if [ "$v" -lt 100 ]; then
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echo "FAIL compression ratio: 0.$v:1"
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ERR_CODE=-1
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return
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fi
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echo "zram compression ratio: $(echo "scale=2; $v / 100 " | bc):1: OK"
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done
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}
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check_prereqs
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zram_load
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zram_max_streams
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zram_compress_alg
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zram_set_disksizes
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zram_set_memlimit
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zram_makefs
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zram_mount
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zram_fill_fs
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zram_cleanup
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if [ $ERR_CODE -ne 0 ]; then
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echo "$TCID : [FAIL]"
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else
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echo "$TCID : [PASS]"
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fi
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