Date:	Fri, 14 Aug 2015 00:51:35 +0530
From:	Naresh Kamboju <naresh.kamboju@...aro.org>
To:	Shuah Khan <shuahkh@....samsung.com>,
	Tyler Baker <tyler.baker@...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

Hi Shuah Khan,

On 23 July 2015 at 20:33, Shuah Khan <shuahkh@....samsung.com> wrote:
> 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:

I agree with Shuah Khan comments.
run_kselftests.sh is design to print results in PASS or FAIL.
We need a way in run_kselftests.sh to print NO_CONFIG when it is not a
real failure instead it is a Kconfig not enabled.

>
>>
>>> 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.

Here with this case, when test run manually it prints "CONFIG_ZRAM is
not set" but with run_kselftests.sh script file it gonna FAIL with
non-zero exit code. but it is not a real failure.
How to handle this case ?

Thank you.

Best regards
Naresh Kamboju

>
> 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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