----- Original Message -----
> From: "Satish Gedela" <satish.ged...@lge.com>
> To: ltp-list@lists.sourceforge.net
> Sent: Friday, 20 March, 2015 6:28:34 AM
> Subject: [LTP] MAP_LOCKED issue in mmap with MAP_ANYNOMOUS
>
> 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.
Hi,
failing how? EINVAL or something else?
Do you see mmap14 failing as well? If so, can you run it via strace?
Regards,
Jan
> 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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news, videos, case studies, tutorials and more. Take a look and join the
conversation now. http://goparallel.sourceforge.net/
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