Date:	Mon, 17 Aug 2015 15:44:25 -0600
From:	Shuah Khan <shuahkh@....samsung.com>
To:	naresh.kamboju@...aro.org, linux-kernel@...r.kernel.org
CC:	tyler.baker@...aro.org, milosz.wasilewski@...aro.org,
	alexey.kodanev@...cle.com, Shuah Khan <shuahkh@....samsung.com>
Subject: Re: [PATCH v2] selftests/zram: Adding zram tests

On 08/17/2015 02:39 PM, naresh.kamboju@...aro.org wrote:
> From: Naresh Kamboju <naresh.kamboju@...aro.org>

Are you using git send-email to send this patch? Not sure why
I see this From and the one below.

> 
> zram.sh: sanity check of CONFIG_ZRAM and run zram01.sh and zram02.sh
> 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

Could please write a proper commit message instead of list of files
and description.

> 
> From: Alexey Kodanev <alexey.kodanev@...cle.com>

Same comment here.

> CC: Shuah Khan <shuahkh@....samsung.com>
> CC: Tyler Baker <tyler.baker@...aro.org>
> CC: Milosz Wasilewski <milosz.wasilewski@...aro.org>
> Signed-off-by: Naresh Kamboju <naresh.kamboju@...aro.org>
> Signed-off-by: Alexey Kodanev <alexey.kodanev@...cle.com>
> ---
>  tools/testing/selftests/Makefile         |   1 +
>  tools/testing/selftests/zram/Makefile    |  12 ++
>  tools/testing/selftests/zram/README      |  40 ++++++
>  tools/testing/selftests/zram/zram.sh     |  22 +++
>  tools/testing/selftests/zram/zram01.sh   |  98 ++++++++++++++
>  tools/testing/selftests/zram/zram02.sh   |  53 ++++++++
>  tools/testing/selftests/zram/zram_lib.sh | 222 +++++++++++++++++++++++++++++++
>  7 files changed, 448 insertions(+)
>  create mode 100644 tools/testing/selftests/zram/Makefile
>  create mode 100644 tools/testing/selftests/zram/README
>  create mode 100755 tools/testing/selftests/zram/zram.sh
>  create mode 100755 tools/testing/selftests/zram/zram01.sh
>  create mode 100755 tools/testing/selftests/zram/zram02.sh
>  create mode 100755 tools/testing/selftests/zram/zram_lib.sh
> 
> diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
> index 24ae9e8..9763dd9 100644
> --- a/tools/testing/selftests/Makefile
> +++ b/tools/testing/selftests/Makefile
> @@ -22,6 +22,7 @@ endif
>  TARGETS += user
>  TARGETS += vm
>  TARGETS += x86
> +TARGETS += zram
>  #Please keep the TARGETS list alphabetically sorted
>  # Run "make quicktest=1 run_tests" or
>  # "make quicktest=1 kselftest from top level Makefile
> diff --git a/tools/testing/selftests/zram/Makefile b/tools/testing/selftests/zram/Makefile
> new file mode 100644
> index 0000000..ec45513
> --- /dev/null
> +++ b/tools/testing/selftests/zram/Makefile
> @@ -0,0 +1,12 @@
> +all:
> +
> +TEST_PROGS := zram.sh
> +TEST_FILES := zram01.sh zram02.sh zram_lib.sh
> +
> +include ../lib.mk
> +
> +run_tests:
> +	@/bin/bash ./zram.sh
> +
> +clean:
> +	$(RM) err.log
> diff --git a/tools/testing/selftests/zram/README b/tools/testing/selftests/zram/README
> new file mode 100644
> index 0000000..eb17917
> --- /dev/null
> +++ b/tools/testing/selftests/zram/README
> @@ -0,0 +1,40 @@
> +zram: Compressed RAM based block devices
> +----------------------------------------
> +* Introduction
> +
> +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>/
> +
> +Kconfig required:
> +CONFIG_ZRAM=y
> +CONFIG_ZRAM_LZ4_COMPRESS=y
> +CONFIG_ZPOOL=y
> +CONFIG_ZSMALLOC=y
> +
> +ZRAM Testcases
> +--------------
> +zram_lib.sh: create library with initialization/cleanup functions
> +zram.sh: For sanity check of CONFIG_ZRAM and to run zram01 and zram02
> +
> +Two functional tests: zram01 and zram02:
> +zram01.sh: creates general purpose ram disks with ext4 filesystems
> +zram02.sh: creates block device for swap
> +
> +Commands required for testing:
> + - bc
> + - dd
> + - free
> + - awk
> + - mkswap
> + - swapon
> + - swapoff
> + - mkfs/ mkfs.ext4
> +
> +For more information please refer:
> +kernel-source-tree/Documentation/blockdev/zram.txt
> diff --git a/tools/testing/selftests/zram/zram.sh b/tools/testing/selftests/zram/zram.sh
> new file mode 100755
> index 0000000..be219fd
> --- /dev/null
> +++ b/tools/testing/selftests/zram/zram.sh
> @@ -0,0 +1,22 @@
> +#!/bin/bash
> +TCID="zram.sh"
> +
> +run_zram () {
> +echo "--------------------"
> +echo "running zram tests"
> +echo "--------------------"
> +./zram01.sh
> +./zram02.sh
> +}
> +
> +# check zram module exists
> +MODULE_PATH=/lib/modules/`uname -r`/kernel/drivers/block/zram/zram.ko
> +if [ -f $MODULE_PATH ]; then
> +	run_zram
> +elif [ -b /dev/zram0 ]; then
> +	run_zram
> +else
> +	echo "$TCID : No zram.ko module or /dev/zram0 device file not found"
> +	echo "$TCID : CONFIG_ZRAM is not set"
> +	exit 1
> +fi
> diff --git a/tools/testing/selftests/zram/zram01.sh b/tools/testing/selftests/zram/zram01.sh
> new file mode 100755
> index 0000000..2a2475d
> --- /dev/null
> +++ b/tools/testing/selftests/zram/zram01.sh
> @@ -0,0 +1,98 @@
> +#!/bin/bash
> +# Copyright (c) 2015 Oracle and/or its affiliates. All Rights Reserved.
> +#
> +# This program is free software; you can redistribute it and/or
> +# modify it under the terms of the GNU General Public License as
> +# published by the Free Software Foundation; either version 2 of
> +# the License, or (at your option) any later version.
> +#
> +# This program is distributed in the hope that it would be useful,
> +# but WITHOUT ANY WARRANTY; without even the implied warranty of
> +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	See the
> +# GNU General Public License for more details.
> +#
> +# 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@...cle.com>
> +# Modified: Naresh Kamboju <naresh.kamboju@...aro.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()
> +{
> +	local mem_free0=$(free -m | awk 'NR==2 {print $4}')
> +
> +	for i in $(seq 0 $(($dev_num - 1))); 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"
> +	done
> +
> +	local mem_free1=$(free -m | awk 'NR==2 {print $4}')
> +	local used_mem=$(($mem_free0 - $mem_free1))
> +
> +	local total_size=0
> +	for sm in $zram_sizes; do
> +		local s=$(echo $sm | sed 's/M//')
> +		total_size=$(($total_size + $s))
> +	done
> +
> +	echo "zram used ${used_mem}M, zram disk sizes ${total_size}M"
> +
> +	local v=$((100 * $total_size / $used_mem))
> +
> +	if [ "$v" -lt 100 ]; then
> +		echo "FAIL compression ratio: 0.$v:1"
> +		ERR_CODE=-1
> +		zram_cleanup
> +		return
> +	fi
> +
> +	echo "zram compression ratio: $(echo "scale=2; $v / 100 " | bc):1: OK"
> +}
> +
> +zram_load
> +zram_max_streams
> +zram_compress_alg
> +zram_set_disksizes
> +zram_set_memlimit
> +zram_makefs
> +zram_mount
> +
> +zram_fill_fs
> +zram_cleanup
> +zram_unload
> +
> +if [ $ERR_CODE -ne 0 ]; then
> +	echo "$TCID : [FAIL]"
> +else
> +	echo "$TCID : [PASS]"
> +fi
> diff --git a/tools/testing/selftests/zram/zram02.sh b/tools/testing/selftests/zram/zram02.sh
> new file mode 100755
> index 0000000..96e82dc
> --- /dev/null
> +++ b/tools/testing/selftests/zram/zram02.sh
> @@ -0,0 +1,53 @@
> +#!/bin/bash
> +# Copyright (c) 2015 Oracle and/or its affiliates. All Rights Reserved.
> +#
> +# This program is free software; you can redistribute it and/or
> +# modify it under the terms of the GNU General Public License as
> +# published by the Free Software Foundation; either version 2 of
> +# the License, or (at your option) any later version.
> +#
> +# This program is distributed in the hope that it would be useful,
> +# but WITHOUT ANY WARRANTY; without even the implied warranty of
> +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	See the
> +# GNU General Public License for more details.
> +#
> +# Test checks that we can create swap zram device.
> +#
> +# Author: Alexey Kodanev <alexey.kodanev@...cle.com>
> +# Modified: Naresh Kamboju <naresh.kamboju@...aro.org>
> +
> +TCID="zram02"
> +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="1048576" # 1M
> +zram_mem_limits="1M"
> +
> +zram_load
> +zram_max_streams
> +zram_set_disksizes
> +zram_set_memlimit
> +zram_makeswap
> +zram_swapoff
> +zram_cleanup
> +zram_unload
> +
> +if [ $ERR_CODE -ne 0 ]; then
> +	echo "$TCID : [FAIL]"
> +else
> +	echo "$TCID : [PASS]"
> +fi
> diff --git a/tools/testing/selftests/zram/zram_lib.sh b/tools/testing/selftests/zram/zram_lib.sh
> new file mode 100755
> index 0000000..3b6abf1
> --- /dev/null
> +++ b/tools/testing/selftests/zram/zram_lib.sh
> @@ -0,0 +1,222 @@
> +#!/bin/sh
> +# Copyright (c) 2015 Oracle and/or its affiliates. All Rights Reserved.
> +#
> +# This program is free software; you can redistribute it and/or
> +# modify it under the terms of the GNU General Public License as
> +# published by the Free Software Foundation; either version 2 of
> +# the License, or (at your option) any later version.
> +#
> +# This program is distributed in the hope that it would be useful,
> +# but WITHOUT ANY WARRANTY; without even the implied warranty of
> +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	See the
> +# GNU General Public License for more details.
> +#
> +# Author: Alexey Kodanev <alexey.kodanev@...cle.com>
> +# Modified: Naresh Kamboju <naresh.kamboju@...aro.org>
> +
> +MODULE=0
> +dev_makeswap=-1
> +dev_mounted=-1
> +
> +trap INT
> +
> +zram_cleanup()
> +{
> +	echo "zram cleanup"
> +	local i=
> +	for i in $(seq 0 $dev_makeswap); do
> +		swapoff /dev/zram$i
> +	done
> +
> +	for i in $(seq 0 $dev_mounted); do
> +		umount /dev/zram$i
> +	done
> +
> +	for i in $(seq 0 $(($dev_num - 1))); do
> +		echo 1 > /sys/block/zram${i}/reset
> +		rm -rf zram$i
> +	done
> +
> +}
> +
> +zram_unload()
> +{
> +	if [ $MODULE -ne 0 ] ; then
> +		echo "zram rmmod zram"
> +		rmmod zram > /dev/null 2>&1
> +	fi
> +}
> +
> +zram_load()
> +{
> +	# check zram module exists
> +	MODULE_PATH=/lib/modules/`uname -r`/kernel/drivers/block/zram/zram.ko
> +	if [ -f $MODULE_PATH ]; then
> +		MODULE=1
> +		echo "create '$dev_num' zram device(s)"
> +		modprobe zram num_devices=$dev_num
> +		if [ $? -ne 0 ]; then
> +			echo "failed to insert zram module"
> +			exit 1
> +		fi
> +
> +		dev_num_created=$(ls /dev/zram* | wc -w)
> +
> +		if [ "$dev_num_created" -ne "$dev_num" ]; then
> +			echo "unexpected num of devices: $dev_num_created"
> +			ERR_CODE=-1
> +		else
> +			echo "zram load module successful"
> +		fi
> +	elif [ -b /dev/zram0 ]; then
> +		echo "/dev/zram0 device file found: OK"
> +	else
> +		echo "ERROR: No zram.ko module or no /dev/zram0 device found"
> +		echo "$TCID : CONFIG_ZRAM is not set"
> +		exit 1
> +	fi
> +}
> +
> +zram_max_streams()
> +{
> +	echo "set max_comp_streams to zram device(s)"
> +
> +	local i=0
> +	for max_s in $zram_max_streams; do
> +		local sys_path="/sys/block/zram${i}/max_comp_streams"
> +		echo $max_s > $sys_path || \
> +			echo "FAIL failed to set '$max_s' to $sys_path"
> +		sleep 1
> +		local max_streams=$(cat $sys_path)
> +
> +		[ "$max_s" -ne "$max_streams" ] && \
> +			echo "FAIL can't set max_streams '$max_s', get $max_stream"
> +
> +		i=$(($i + 1))
> +		echo "$sys_path = '$max_streams' ($i/$dev_num)"
> +	done
> +
> +	echo "zram max streams: OK"
> +}
> +
> +zram_compress_alg()
> +{
> +	echo "test that we can set compression algorithm"
> +
> +	local algs=$(cat /sys/block/zram0/comp_algorithm)
> +	echo "supported algs: $algs"
> +	local i=0
> +	for alg in $zram_algs; do
> +		local sys_path="/sys/block/zram${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"
> +}
> 


-- 
Shuah Khan
Sr. Linux Kernel Developer
Open Source Innovation Group
Samsung Research America (Silicon Valley)
shuahkh@....samsung.com | (970) 217-8978
--
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