[v2] selftests/zram: Adding zram tests

Message ID 1439843981-28767-1-git-send-email-naresh.kamboju@linaro.org
State New
Headers show

Commit Message

Naresh Kamboju Aug. 17, 2015, 8:39 p.m.
From: Naresh Kamboju <naresh.kamboju@linaro.org>

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

From: Alexey Kodanev <alexey.kodanev@oracle.com>
CC: Shuah Khan <shuahkh@osg.samsung.com>
CC: Tyler Baker <tyler.baker@linaro.org>
CC: Milosz Wasilewski <milosz.wasilewski@linaro.org>
Signed-off-by: Naresh Kamboju <naresh.kamboju@linaro.org>
Signed-off-by: Alexey Kodanev <alexey.kodanev@oracle.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

Comments

Naresh Kamboju Aug. 19, 2015, 5:35 a.m. | #1
Hi Shuah Khan,

On 18 August 2015 at 03:14, Shuah Khan <shuahkh@osg.samsung.com> wrote:
> On 08/17/2015 02:39 PM, naresh.kamboju@linaro.org wrote:
>> From: Naresh Kamboju <naresh.kamboju@linaro.org>
>
> Are you using git send-email to send this patch? Not sure why
> I see this From and the one below.


I do use git send-email to send this patch.
From: Naresh is generated from git send-patch.

>
>>
>> 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.

Done and sent v3 patch.

>
>>
>> From: Alexey Kodanev <alexey.kodanev@oracle.com>
>
> Same comment here.

The original author of this patch is "Alexey Kodanev". who submitted
patch on LTP.
I have updated and modified to fit into selftests.
That is the reason for adding From: Alexey Kodanev again in commit message.
However, I have added him in CC for v3 patch set.

Best regards
Naresh Kamboju

>
>> CC: Shuah Khan <shuahkh@osg.samsung.com>
>> CC: Tyler Baker <tyler.baker@linaro.org>
>> CC: Milosz Wasilewski <milosz.wasilewski@linaro.org>
>> Signed-off-by: Naresh Kamboju <naresh.kamboju@linaro.org>
>> Signed-off-by: Alexey Kodanev <alexey.kodanev@oracle.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@oracle.com>
>> +# Modified: Naresh Kamboju <naresh.kamboju@linaro.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@oracle.com>
>> +# Modified: Naresh Kamboju <naresh.kamboju@linaro.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@oracle.com>
>> +# Modified: Naresh Kamboju <naresh.kamboju@linaro.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@osg.samsung.com | (970) 217-8978
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Patch

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 "$TCID : CONFIG_ZRAM is not set"
+	exit 1
+fi
diff --git a/tools/testing/selftests/zram/zram01.sh b/tools/testing/selftests/zram/zram01.sh
new file mode 100755
index 0000000..2a2475d
--- /dev/null
+++ b/tools/testing/selftests/zram/zram01.sh
@@ -0,0 +1,98 @@ 
+#!/bin/bash
+# Copyright (c) 2015 Oracle and/or its affiliates. All Rights Reserved.
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation; either version 2 of
+# the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it would be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	See the
+# GNU General Public License for more details.
+#
+# Test creates several zram devices with different filesystems on them.
+# It fills each device with zeros and checks that compression works.
+#
+# Author: Alexey Kodanev <alexey.kodanev@oracle.com>
+# Modified: Naresh Kamboju <naresh.kamboju@linaro.org>
+
+TCID="zram01"
+ERR_CODE=0
+
+. ./zram_lib.sh
+
+# Test will create the following number of zram devices:
+dev_num=1
+# This is a list of parameters for zram devices.
+# Number of items must be equal to 'dev_num' parameter.
+zram_max_streams="2"
+
+# The zram sysfs node 'disksize' value can be either in bytes,
+# or you can use mem suffixes. But in some old kernels, mem
+# suffixes are not supported, for example, in RHEL6.6GA's kernel
+# layer, it uses strict_strtoull() to parse disksize which does
+# not support mem suffixes, in some newer kernels, they use
+# memparse() which supports mem suffixes. So here we just use
+# bytes to make sure everything works correctly.
+zram_sizes="2097152" # 2MB
+zram_mem_limits="2M"
+zram_filesystems="ext4"
+zram_algs="lzo"
+
+zram_fill_fs()
+{
+	local mem_free0=$(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@oracle.com>
+# Modified: Naresh Kamboju <naresh.kamboju@linaro.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@oracle.com>
+# Modified: Naresh Kamboju <naresh.kamboju@linaro.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"
+}