Message-ID: <55B10259.7000804@osg.samsung.com>
Date:	Thu, 23 Jul 2015 09:03:53 -0600
From:	Shuah Khan <shuahkh@....samsung.com>
To:	Tyler Baker <tyler.baker@...aro.org>,
	Naresh Kamboju <naresh.kamboju@...aro.org>
CC:	alexey.kodanev@...cle.com,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	lsk-team@...aro.org, Kevin Hilman <khilman@...aro.org>,
	Milosz Wasilewski <milosz.wasilewski@...aro.org>
Subject: Re: [PATCH] selftests/zram: Adding zram tests

On 07/22/2015 06:00 PM, Tyler Baker wrote:
> Hi Naresh,
> 
> On 7 July 2015 at 05:03,  <naresh.kamboju@...aro.org> wrote:
>> From: Naresh Kamboju <naresh.kamboju@...aro.org>
>>
>> zram_lib.sh: create library with initialization/cleanup functions
>> zram01.sh: creates general purpose ram disks with different filesystems
>> zram02.sh: creates block device for swap
>> README: ZRAM introduction and Kconfig required.
>> Makefile: To run zram tests
> 
> (./zram01.sh && echo "selftests: zram01.sh [PASS]") || echo
> "selftests: zram01.sh [FAIL]"
> (./zram02.sh && echo "selftests: zram02.sh [PASS]") || echo
> "selftests: zram02.sh [FAIL]"
> (./zram_lib.sh && echo "selftests: zram_lib.sh [PASS]") || echo
> "selftests: zram_lib.sh [FAIL]"
> 
> Above is the output from the run_kselftests.sh. Do we want to run
> zram_lib.sh as a test case as it just a library?

Please make sure test doesn't fail when zram isn't configured.
i.e it should exit gracefully with a message saying zram isn't
configured. Please see below:

> 
>> Author: Alexey Kodanev <alexey.kodanev@...cle.com>
>> Signed-off-by: Naresh Kamboju <naresh.kamboju@...aro.org>
>> ---
>>  tools/testing/selftests/Makefile         |   1 +
>>  tools/testing/selftests/zram/Makefile    |  12 ++
>>  tools/testing/selftests/zram/README      |  39 ++++++
>>  tools/testing/selftests/zram/zram01.sh   | 102 ++++++++++++++
>>  tools/testing/selftests/zram/zram02.sh   |  57 ++++++++
>>  tools/testing/selftests/zram/zram_lib.sh | 223 +++++++++++++++++++++++++++++++
>>  6 files changed, 434 insertions(+)
>>  create mode 100644 tools/testing/selftests/zram/Makefile
>>  create mode 100644 tools/testing/selftests/zram/README
>>  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..a27a797
>> --- /dev/null
>> +++ b/tools/testing/selftests/zram/Makefile
>> @@ -0,0 +1,12 @@
>> +all:
>> +
>> +TEST_PROGS := zram01.sh zram02.sh zram_lib.sh
>> +
>> +include ../lib.mk
>> +
>> +run_tests:
>> +       @/bin/bash ./zram01.sh; \
>> +       /bin/bash ./zram02.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..36db066
>> --- /dev/null
>> +++ b/tools/testing/selftests/zram/README
>> @@ -0,0 +1,39 @@
>> +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
>> +
>> +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/zram01.sh b/tools/testing/selftests/zram/zram01.sh
>> new file mode 100755
>> index 0000000..b63eb5d
>> --- /dev/null
>> +++ b/tools/testing/selftests/zram/zram01.sh
>> @@ -0,0 +1,102 @@
>> +#!/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.
>> +#
>> +# You should have received a copy of the GNU General Public License
>> +# along with this program; if not, write the Free Software Foundation,
>> +# Inc.,        51 Franklin St, Fifth Floor, Boston, MA 02110-1301      USA
> 
> checkpatch is complaining about including the FSF address, so lets remove it.
> 
>> +#
>> +# 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..81855ce
>> --- /dev/null
>> +++ b/tools/testing/selftests/zram/zram02.sh
>> @@ -0,0 +1,57 @@
>> +#!/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.
>> +#
>> +# You should have received a copy of the GNU General Public License
>> +# along with this program; if not, write the Free Software Foundation,
>> +# Inc.,        51 Franklin St, Fifth Floor, Boston, MA 02110-1301      USA
> 
> Here as well.
> 
>> +#
>> +# 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..c40a1cf
>> --- /dev/null
>> +++ b/tools/testing/selftests/zram/zram_lib.sh
>> @@ -0,0 +1,223 @@
>> +#!/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.
>> +#
>> +# You should have received a copy of the GNU General Public License
>> +# along with this program; if not, write the Free Software Foundation,
>> +# Inc.,        51 Franklin St, Fifth Floor, Boston, MA 02110-1301      USA
> 
> And here again.
> 
>> +#
>> +# 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/zram/zram.ko
>> +       if [ -f $MODULE_PATH ]; then
>> +               MODULE=1
>> +               echo "create '$dev_num' zram device(s)"
>> +               modprobe zram num_devices=$dev_num || \
>> +               echo "failed to insert zram module"
>> +
>> +               dev_num_created=$(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

In this case, when zram.ko module or no /dev/zram0 device found,
test should exit gracefully.

thanks,
-- Shuah

-- 
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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