Dear all,
I am newbie to open source, forgive me with text format
I am trying to run LTP with kernel 3.16 on target board having cortex A9
processor ,
Facing issue with below test case:
Test script name: "memcg_function_test.sh"
Test case description: "Test mmap(locked) + alloc_mem > limit_in_bytes"
Analysis: memcg_function_test.sh -----> test_proc_kill
------->memcg_lib.sh
-------->memcg_process
memcg_process
------>ltp/testcases/kernel/controllers/memcg/functional/memcg_process.c
mmap_lock1 () function is calling in memcg_process.c and
it calls mmap function with flags MAP_PRIVATE | MAP_ANYNOMOUS | MAP_LOCKED
{noformat}
p = mmap(NULL, memsize, PROT_WRITE | PROT_READ,
MAP_PRIVATE | MAP_LOCKED, 0, 0);
{noformat}
but man page of mmap is mentioned as:
{noformat}
MAP_ANONYMOUS
The mapping is not backed by any file; its contents are
initialized to zero. The fd and offset arguments are
ignored; however, some implementations require fd to be -1 if
MAP_ANONYMOUS (or MAP_ANON) is specified, and portable
applications should ensure this. The use of MAP_ANONYMOUS in
conjunction with MAP_SHARED is only supported on Linux
since kernel 2.4.
{noformat}
In my case, we are trying to lock the pages with flags MAP_PRIVATE |
MAP_ANYNOMOUS | MAP_LOCKED and it is failing.
and with MAP_SHARED | MAP_ANYNOMOUS | MAP_LOCKED , it is failing
but with MAP_PRIVATE | MAP_LOCKED and
with MAP_SHARED | MAP_LOCKED it is working.
Is there any changes made to kernel or
test case has to update with MAP_SHARED instead of MAP_PRIVATE flag.
Thank you in advance.
Regards
Satish.G
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