swap test for cgroups

[Kevin Wilson]

Hi,

I had tried to perform the following test according to:
http://lxr.free-electrons.com/source/Documentation/cgroups/memcg_test.txt#L211
mkdir /sys/fs/cgroup/memory/group1

echo $$ > /sys/fs/cgroup/memory/group1/cgroup.procs

echo 40M >  /sys/fs/cgroup/memory/group1/memory.limit_in_bytes

Run a process which is a very short program, allocating 100MB:
int main() {
// Allocate 100 MB
  void *mem = malloc(1024*1024*100);
  if (mem)
      printf("malloc is ok\n");
  pause();
}


VmSize seems a bit larger than 100MB, and this seems ok, when adding
the overhead of running a process:
cat /proc/$$/status | grep VmSize
VmSize:   116920 kB



cat   /sys/fs/cgroup/memory/group1/memory.stat  | grep swap
swap 0
total_swap 0

cat /proc/$$/status | grep  -i swap
VmSwap:        0 kB


I would expect that the swap will be 60M according to the link to the
memcg_test.txt mentioned earlier.

Any ideas ?

Regards,
Kevin