Memory swappiness option takes 0-100, and helps to tune swappiness
behavior per container.
For example, When a lower value of swappiness is chosen
the container will see minimum major faults. When no value is
specified for memory-swappiness in docker UI, it is inherited from
parent cgroup. (generally 60 unless it is changed).
Signed-off-by: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>
The cleanup to sysinfo package introduced a regression.
If memory cgroup isn't supported and --memory is specified when
starting a container, we should return info instead of nil in
checkCgroupMem(), otherwise we'll access a nil pointer.
Signed-off-by: Zefan Li <lizefan@huawei.com>
