[LTP] [PATCH v2] zram03: drop obsolete sysfs interfaces

[Xiao Yang <yangx.jy@cn.fujitsu.com>]

On 2018/06/12 20:02, Petr Vorel wrote:
> Hi Yang,
>
>> Due to upstream linux commit c87d1655c29500b459fb135258a93f8309ada9c7
>> ("zram: remove obsolete sysfs attrs"), some sysfs interfaces are not
>> available anymore.
>  From the commit is seen, that most of them (missing num_reads and
> num_writes) has been accessible for some time from /sys/block/zram<id>/mm_stat.
> And indeed the docs [1] confirm that. Maybe it'd make sense to parse this file
> and use the data.
>
> /sys/block/zram<id>/mm_stat was added in 4f2109f608815 (v4.1-rc1)
> Interesting, it's also in Centos7 3.10.0-693 kernel, it must have been
> backported there (obviously not in 3.16 from Debian).
>
> [1] https://www.kernel.org/doc/Documentation/blockdev/zram.txt
Hi Petr,

I am sorry for missing this patch.

I got the same issue and have sent another patch to fix it as you suggested.
Could you help me review the following patch:
http://lists.linux.it/pipermail/ltp/2018-July/008702.html

Thanks,
Xiao Yang
>
> Kind regards,
> Petr
>
>> Check kernel version, and remove dumping them on>= 4.10 kernel to avoid
>> test case failure.
>> Suggested-by: Li Wang<liwang@redhat.com>
>> Signed-off-by: Yang Shi<yang.shi@linux.alibaba.com>
>> ---
>> v1 -->  v2:
>> Check kernel version to dump proper stats per Li Wang's suggestion
>>   testcases/kernel/device-drivers/zram/zram03.c | 16 ++++++++++------
>>   1 file changed, 10 insertions(+), 6 deletions(-)
>> diff --git a/testcases/kernel/device-drivers/zram/zram03.c b/testcases/kernel/device-drivers/zram/zram03.c
>> index 3f7ab4e..58d88bc 100644
>> --- a/testcases/kernel/device-drivers/zram/zram03.c
>> +++ b/testcases/kernel/device-drivers/zram/zram03.c
>> @@ -185,11 +185,15 @@ static void print(char *string)
>>   static void dump_info(void)
>>   {
>>   	print("initstate");
>> -	print("compr_data_size");
>> -	print("orig_data_size");
>>   	print("disksize");
>> -	print("mem_used_total");
>> -	print("num_reads");
>> -	print("num_writes");
>> -	print("zero_pages");
>> +
>> +	if ((tst_kvercmp(4, 10, 0))<  0) {
>> +		/* The below stats are not available on 4.10 or newer kernel */
>> +		print("compr_data_size");
>> +		print("orig_data_size");
>> +		print("mem_used_total");
>> +		print("num_reads");
>> +		print("num_writes");
>> +		print("zero_pages");
>> +	}
>>   }