selftests/zram: Adding zram tests
zram: Compressed RAM based block devices ---------------------------------------- The zram module creates RAM based block devices named /dev/zram<id> (<id> = 0, 1, ...). Pages written to these disks are compressed and stored in memory itself. These disks allow very fast I/O and compression provides good amounts of memory savings. Some of the usecases include /tmp storage, use as swap disks, various caches under /var and maybe many more :) Statistics for individual zram devices are exported through sysfs nodes at /sys/block/zram<id>/ This patch is to validate the zram functionality. Test interacts with block device /dev/zram<id> and sysfs nodes /sys/block/zram<id>/ zram.sh: sanity check of CONFIG_ZRAM and to run zram01 and zram02 tests zram01.sh: creates general purpose ram disks with different filesystems zram02.sh: creates block device for swap zram_lib.sh: create library with initialization/cleanup functions README: ZRAM introduction and Kconfig required. Makefile: To run zram tests zram test output ----------------- ./zram.sh -------------------- running zram tests -------------------- /dev/zram0 device file found: OK set max_comp_streams to zram device(s) /sys/block/zram0/max_comp_streams = '2' (1/1) zram max streams: OK test that we can set compression algorithm supported algs: [lzo] lz4 /sys/block/zram0/comp_algorithm = 'lzo' (1/1) zram set compression algorithm: OK set disk size to zram device(s) /sys/block/zram0/disksize = '2097152' (1/1) zram set disksizes: OK set memory limit to zram device(s) /sys/block/zram0/mem_limit = '2M' (1/1) zram set memory limit: OK make ext4 filesystem on /dev/zram0 zram mkfs.ext4: OK mount /dev/zram0 zram mount of zram device(s): OK fill zram0... zram0 can be filled with '1932' KB zram used 3M, zram disk sizes 2097152M zram compression ratio: 699050.66:1: OK zram cleanup zram01 : [PASS] /dev/zram0 device file found: OK set max_comp_streams to zram device(s) /sys/block/zram0/max_comp_streams = '2' (1/1) zram max streams: OK set disk size to zram device(s) /sys/block/zram0/disksize = '1048576' (1/1) zram set disksizes: OK set memory limit to zram device(s) /sys/block/zram0/mem_limit = '1M' (1/1) zram set memory limit: OK make swap with zram device(s) done with /dev/zram0 zram making zram mkswap and swapon: OK zram swapoff: OK zram cleanup zram02 : [PASS] CC: Shuah Khan <shuahkh@osg.samsung.com> CC: Tyler Baker <tyler.baker@linaro.org> CC: Milosz Wasilewski <milosz.wasilewski@linaro.org> CC: Alexey Kodanev <alexey.kodanev@oracle.com> Signed-off-by: Naresh Kamboju <naresh.kamboju@linaro.org> Signed-off-by: Alexey Kodanev <alexey.kodanev@oracle.com> Reviewed-By: Tyler Baker <tyler.baker@linaro.org> Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
This commit is contained in:
Naresh Kamboju
Shuah Khan
parent
d770e558e2
commit
f21fb798fe
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@ -22,6 +22,7 @@ endif
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TARGETS += user
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TARGETS += user
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TARGETS += vm
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TARGETS += vm
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TARGETS += x86
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TARGETS += x86
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TARGETS += zram
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#Please keep the TARGETS list alphabetically sorted
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#Please keep the TARGETS list alphabetically sorted
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# Run "make quicktest=1 run_tests" or
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# Run "make quicktest=1 run_tests" or
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# "make quicktest=1 kselftest from top level Makefile
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# "make quicktest=1 kselftest from top level Makefile
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@ -0,0 +1,12 @@
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all:
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TEST_PROGS := zram.sh
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TEST_FILES := zram01.sh zram02.sh zram_lib.sh
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include ../lib.mk
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run_tests:
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@/bin/bash ./zram.sh
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clean:
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$(RM) err.log
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@ -0,0 +1,40 @@
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zram: Compressed RAM based block devices
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----------------------------------------
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* Introduction
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The zram module creates RAM based block devices named /dev/zram<id>
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(<id> = 0, 1, ...). Pages written to these disks are compressed and stored
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in memory itself. These disks allow very fast I/O and compression provides
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good amounts of memory savings. Some of the usecases include /tmp storage,
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use as swap disks, various caches under /var and maybe many more :)
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Statistics for individual zram devices are exported through sysfs nodes at
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/sys/block/zram<id>/
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Kconfig required:
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CONFIG_ZRAM=y
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CONFIG_ZRAM_LZ4_COMPRESS=y
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CONFIG_ZPOOL=y
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CONFIG_ZSMALLOC=y
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ZRAM Testcases
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--------------
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zram_lib.sh: create library with initialization/cleanup functions
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zram.sh: For sanity check of CONFIG_ZRAM and to run zram01 and zram02
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Two functional tests: zram01 and zram02:
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zram01.sh: creates general purpose ram disks with ext4 filesystems
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zram02.sh: creates block device for swap
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Commands required for testing:
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- bc
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- dd
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- free
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- awk
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- mkswap
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- swapon
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- swapoff
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- mkfs/ mkfs.ext4
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For more information please refer:
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kernel-source-tree/Documentation/blockdev/zram.txt
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@ -0,0 +1,23 @@
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#!/bin/bash
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TCID="zram.sh"
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run_zram () {
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echo "--------------------"
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echo "running zram tests"
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echo "--------------------"
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./zram01.sh
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echo ""
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./zram02.sh
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}
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# check zram module exists
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MODULE_PATH=/lib/modules/`uname -r`/kernel/drivers/block/zram/zram.ko
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if [ -f $MODULE_PATH ]; then
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run_zram
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elif [ -b /dev/zram0 ]; then
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run_zram
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else
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echo "$TCID : No zram.ko module or /dev/zram0 device file not found"
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echo "$TCID : CONFIG_ZRAM is not set"
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exit 1
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fi
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@ -0,0 +1,98 @@
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#!/bin/bash
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# Copyright (c) 2015 Oracle and/or its affiliates. All Rights Reserved.
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License as
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# published by the Free Software Foundation; either version 2 of
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# the License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it would be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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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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local mem_free0=$(free -m | awk 'NR==2 {print $4}')
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for i in $(seq 0 $(($dev_num - 1))); 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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done
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local mem_free1=$(free -m | awk 'NR==2 {print $4}')
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local used_mem=$(($mem_free0 - $mem_free1))
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local total_size=0
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for sm in $zram_sizes; do
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local s=$(echo $sm | sed 's/M//')
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total_size=$(($total_size + $s))
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done
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echo "zram used ${used_mem}M, zram disk sizes ${total_size}M"
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local v=$((100 * $total_size / $used_mem))
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if [ "$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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zram_cleanup
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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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}
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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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zram_unload
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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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@ -0,0 +1,53 @@
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#!/bin/bash
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# Copyright (c) 2015 Oracle and/or its affiliates. All Rights Reserved.
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License as
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# published by the Free Software Foundation; either version 2 of
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# the License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it would be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# Test checks that we can create swap zram device.
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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="zram02"
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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="1048576" # 1M
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zram_mem_limits="1M"
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zram_load
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zram_max_streams
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zram_set_disksizes
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zram_set_memlimit
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zram_makeswap
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zram_swapoff
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zram_cleanup
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zram_unload
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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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@ -0,0 +1,222 @@
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#!/bin/sh
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# Copyright (c) 2015 Oracle and/or its affiliates. All Rights Reserved.
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License as
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# published by the Free Software Foundation; either version 2 of
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# the License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it would be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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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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MODULE=0
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dev_makeswap=-1
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dev_mounted=-1
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trap INT
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zram_cleanup()
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{
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echo "zram cleanup"
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local i=
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for i in $(seq 0 $dev_makeswap); do
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swapoff /dev/zram$i
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done
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for i in $(seq 0 $dev_mounted); do
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umount /dev/zram$i
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done
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for i in $(seq 0 $(($dev_num - 1))); do
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echo 1 > /sys/block/zram${i}/reset
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rm -rf zram$i
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done
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}
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zram_unload()
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{
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if [ $MODULE -ne 0 ] ; then
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echo "zram rmmod zram"
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rmmod zram > /dev/null 2>&1
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fi
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}
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zram_load()
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{
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# check zram module exists
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MODULE_PATH=/lib/modules/`uname -r`/kernel/drivers/block/zram/zram.ko
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if [ -f $MODULE_PATH ]; then
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MODULE=1
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echo "create '$dev_num' zram device(s)"
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modprobe zram num_devices=$dev_num
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if [ $? -ne 0 ]; then
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echo "failed to insert zram module"
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exit 1
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fi
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dev_num_created=$(ls /dev/zram* | wc -w)
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if [ "$dev_num_created" -ne "$dev_num" ]; then
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echo "unexpected num of devices: $dev_num_created"
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ERR_CODE=-1
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else
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echo "zram load module successful"
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fi
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elif [ -b /dev/zram0 ]; then
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echo "/dev/zram0 device file found: OK"
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else
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echo "ERROR: No zram.ko module or no /dev/zram0 device found"
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echo "$TCID : CONFIG_ZRAM is not set"
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exit 1
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fi
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}
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zram_max_streams()
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{
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echo "set max_comp_streams to zram device(s)"
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local i=0
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for max_s in $zram_max_streams; do
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local sys_path="/sys/block/zram${i}/max_comp_streams"
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echo $max_s > $sys_path || \
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echo "FAIL failed to set '$max_s' to $sys_path"
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sleep 1
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local max_streams=$(cat $sys_path)
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[ "$max_s" -ne "$max_streams" ] && \
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echo "FAIL can't set max_streams '$max_s', get $max_stream"
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i=$(($i + 1))
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echo "$sys_path = '$max_streams' ($i/$dev_num)"
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done
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echo "zram max streams: OK"
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}
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zram_compress_alg()
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{
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echo "test that we can set compression algorithm"
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local algs=$(cat /sys/block/zram0/comp_algorithm)
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echo "supported algs: $algs"
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local i=0
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for alg in $zram_algs; do
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||||||
|
local sys_path="/sys/block/zram${i}/comp_algorithm"
|
||||||
|
echo "$alg" > $sys_path || \
|
||||||
|
echo "FAIL can't set '$alg' to $sys_path"
|
||||||
|
i=$(($i + 1))
|
||||||
|
echo "$sys_path = '$alg' ($i/$dev_num)"
|
||||||
|
done
|
||||||
|
|
||||||
|
echo "zram set compression algorithm: OK"
|
||||||
|
}
|
||||||
|
|
||||||
|
zram_set_disksizes()
|
||||||
|
{
|
||||||
|
echo "set disk size to zram device(s)"
|
||||||
|
local i=0
|
||||||
|
for ds in $zram_sizes; do
|
||||||
|
local sys_path="/sys/block/zram${i}/disksize"
|
||||||
|
echo "$ds" > $sys_path || \
|
||||||
|
echo "FAIL can't set '$ds' to $sys_path"
|
||||||
|
|
||||||
|
i=$(($i + 1))
|
||||||
|
echo "$sys_path = '$ds' ($i/$dev_num)"
|
||||||
|
done
|
||||||
|
|
||||||
|
echo "zram set disksizes: OK"
|
||||||
|
}
|
||||||
|
|
||||||
|
zram_set_memlimit()
|
||||||
|
{
|
||||||
|
echo "set memory limit to zram device(s)"
|
||||||
|
|
||||||
|
local i=0
|
||||||
|
for ds in $zram_mem_limits; do
|
||||||
|
local sys_path="/sys/block/zram${i}/mem_limit"
|
||||||
|
echo "$ds" > $sys_path || \
|
||||||
|
echo "FAIL can't set '$ds' to $sys_path"
|
||||||
|
|
||||||
|
i=$(($i + 1))
|
||||||
|
echo "$sys_path = '$ds' ($i/$dev_num)"
|
||||||
|
done
|
||||||
|
|
||||||
|
echo "zram set memory limit: OK"
|
||||||
|
}
|
||||||
|
|
||||||
|
zram_makeswap()
|
||||||
|
{
|
||||||
|
echo "make swap with zram device(s)"
|
||||||
|
local i=0
|
||||||
|
for i in $(seq 0 $(($dev_num - 1))); do
|
||||||
|
mkswap /dev/zram$i > err.log 2>&1
|
||||||
|
if [ $? -ne 0 ]; then
|
||||||
|
cat err.log
|
||||||
|
echo "FAIL mkswap /dev/zram$1 failed"
|
||||||
|
fi
|
||||||
|
|
||||||
|
swapon /dev/zram$i > err.log 2>&1
|
||||||
|
if [ $? -ne 0 ]; then
|
||||||
|
cat err.log
|
||||||
|
echo "FAIL swapon /dev/zram$1 failed"
|
||||||
|
fi
|
||||||
|
|
||||||
|
echo "done with /dev/zram$i"
|
||||||
|
dev_makeswap=$i
|
||||||
|
done
|
||||||
|
|
||||||
|
echo "zram making zram mkswap and swapon: OK"
|
||||||
|
}
|
||||||
|
|
||||||
|
zram_swapoff()
|
||||||
|
{
|
||||||
|
local i=
|
||||||
|
for i in $(seq 0 $dev_makeswap); do
|
||||||
|
swapoff /dev/zram$i > err.log 2>&1
|
||||||
|
if [ $? -ne 0 ]; then
|
||||||
|
cat err.log
|
||||||
|
echo "FAIL swapoff /dev/zram$i failed"
|
||||||
|
fi
|
||||||
|
done
|
||||||
|
dev_makeswap=-1
|
||||||
|
|
||||||
|
echo "zram swapoff: OK"
|
||||||
|
}
|
||||||
|
|
||||||
|
zram_makefs()
|
||||||
|
{
|
||||||
|
local i=0
|
||||||
|
for fs in $zram_filesystems; do
|
||||||
|
# if requested fs not supported default it to ext2
|
||||||
|
which mkfs.$fs > /dev/null 2>&1 || fs=ext2
|
||||||
|
|
||||||
|
echo "make $fs filesystem on /dev/zram$i"
|
||||||
|
mkfs.$fs /dev/zram$i > err.log 2>&1
|
||||||
|
if [ $? -ne 0 ]; then
|
||||||
|
cat err.log
|
||||||
|
echo "FAIL failed to make $fs on /dev/zram$i"
|
||||||
|
fi
|
||||||
|
i=$(($i + 1))
|
||||||
|
echo "zram mkfs.$fs: OK"
|
||||||
|
done
|
||||||
|
}
|
||||||
|
|
||||||
|
zram_mount()
|
||||||
|
{
|
||||||
|
local i=0
|
||||||
|
for i in $(seq 0 $(($dev_num - 1))); do
|
||||||
|
echo "mount /dev/zram$i"
|
||||||
|
mkdir zram$i
|
||||||
|
mount /dev/zram$i zram$i > /dev/null || \
|
||||||
|
echo "FAIL mount /dev/zram$i failed"
|
||||||
|
dev_mounted=$i
|
||||||
|
done
|
||||||
|
|
||||||
|
echo "zram mount of zram device(s): OK"
|
||||||
|
}
|
||||||
Loading…
Reference in New Issue