> -----Original Message-----
> From: Jan Stancek [mailto:jstan...@redhat.com]
> Sent: Friday, March 20, 2015 1:41 PM
> To: Satish Gedela/LGSIA CSP-2(satish.ged...@lge.com)
> Cc: ltp-list@lists.sourceforge.net
> Subject: Re: [LTP] MAP_LOCKED issue in mmap with MAP_ANYNOMOUS
>
>
>
> ----- 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
>
Hi Jan,
Failing to kill process PID.
Not getting EINVAL
I did not test mmap14 but I replaced 5th argument with '-1' instead of '0'
(Based on mmap14 test case)
still getting test case failure.
Test procedure followed:
Test case description : "kill the process if memory limit exceeds ,
Process memory locked through MAP_LOCKED in test_ case_ 14 and using mlock()
in test_case_ 15"
Running LTP on work station using
$make configure
$make
$make install
And copy ltp , kernel, sysinfo.sh, tools into target directory " /opt "
and on target running below commnad
#./runltp -f controllers > log.txt
>From log report, identified mmap-lock1 (MAP_LOCKED) is failing and mmap-lock2
>(mlock2) is passing
So from the memcg_process.c file
mmap_lock1() is using mmap () with MAP_PRIVATE | MAP_ANYNOMOUS |
MAP_LOCKED
mmap_lock2 is using mmap () with MAP_PRIVATE | MAP_ANYNOMOUS
and mlock() function call.
In process of debugging, I replaced mmap_lock1 with mmap_lock2 , in test
_case_ 14 and it is working successfully.
So I identified issue is in mmap() call and
replaced flag as "MAP_SHARED | MAP_LOCKED" and "MAP_PRIVATE | MAP_LOCKED "in
mmap,
it is working successfully in both cases but not with MAP_ANYNOMOUS flag.
Regards
Satish.G
> > 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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