[LTP] [PATCH] syscalls/mallinfo01: Disable free fastbin blocks

[xuyang2018.jy@fujitsu.com]

Hi Martin
  I don't have a proper fix. So you can remove it from runtest file.

Best Regards
Yang Xu
> Hello,
>
> On 13. 05. 21 10:54, Yang Xu wrote:
>> When using malloc to allocate small space, it will use fastbin block firstly if
>> we have free fastbin free blocks, it is more quickly.
>> In here, we just test oldblks free chunks, it is the number of ordinary
>> (i.e. non-fastbin) free blocks. So use mallopt(M_MXFAST, 0) to disable
>> free fastbin block.
>>
>> Signed-off-by: Yang Xu<xuyang2018.jy@fujitsu.com>
>> ---
>>   testcases/kernel/syscalls/mallinfo/mallinfo01.c | 2 ++
>>   1 file changed, 2 insertions(+)
>>
>> diff --git a/testcases/kernel/syscalls/mallinfo/mallinfo01.c b/testcases/kernel/syscalls/mallinfo/mallinfo01.c
>> index 48fce0132..4e10e352e 100644
>> --- a/testcases/kernel/syscalls/mallinfo/mallinfo01.c
>> +++ b/testcases/kernel/syscalls/mallinfo/mallinfo01.c
>> @@ -64,6 +64,8 @@ static void setup(void)
>>   {
>>   	if (sizeof(info1.arena) != sizeof(int))
>>   		tst_res(TFAIL, "The member of mallinfo struct is not int");
>> +	if (mallopt(M_MXFAST, 0) == 0)
>> +		tst_res(TFAIL, "mallopt(M_MXFAST, 0) failed");
>>
>>   	info1 = mallinfo();
>>   	print_mallinfo("Start",&info1);
>>
>
> Sorry but this does not fix the problem. The failing subtest assumes that:
> - malloc() will never increase ordblks
> - free() will allways increase ordblks
>
> mallinfo01 is failing because both of these assumptions are wrong.
> Disabling fastbin block usage will not fix the failure.
>