hg: jdk/sandbox: 8217338: [Containers] Improve systemd slice memory limit support

[chris.hegarty at oracle.com]

Changeset: 1c242c2d037f
Author:    sgehwolf
Date:      2019-03-12 10:43 +0100
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/1c242c2d037f

8217338: [Containers] Improve systemd slice memory limit support
Summary: Use hierachical memory limit in addition to memory_limits_in_bytes
Reviewed-by: bobv, dholmes

! src/hotspot/os/linux/osContainer_linux.cpp
! src/hotspot/os/linux/osContainer_linux.hpp
! src/java.base/linux/classes/jdk/internal/platform/cgroupv1/Metrics.java
! src/java.base/linux/classes/jdk/internal/platform/cgroupv1/SubSystem.java