linux-kernel - Re: [PATCH] selftests/zram: Adding zram tests

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Date:	Thu, 13 Aug 2015 13:39:52 -0600
From:	Shuah Khan <shuahkh@....samsung.com>
To:	Naresh Kamboju <naresh.kamboju@...aro.org>,
	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>,
	Shuah Khan <shuahkh@....samsung.com>
Subject: Re: [PATCH] selftests/zram: Adding zram tests

On 08/13/2015 01:21 PM, Naresh Kamboju wrote:
> 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.
> 
>>

snip

>>>> +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 ?
> 

Right. One way to do this is write wrapper script zram.sh that does
these checks first and then invokes the zram01.sh and zram02.sh
This way you can do the pre-reqs checks first and then run the tests.

Please take a look at tests that do this. e.g: net/test_bpf.sh

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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