cgroup v1 system

Operating System Metrics:
    Provider: cgroupv1
    Effective CPU Count: 8
    CPU Period: 100000us
    CPU Quota: -1
    CPU Shares: -1
    List of Processors, 8 total:
    0 1 2 3 4 5 6 7
    List of Effective Processors: N/A
    List of Memory Nodes, 1 total:
    0
    List of Available Memory Nodes: N/A
    Memory Limit: 50.00M
    Memory Soft Limit: Unlimited
    Memory & Swap Limit: 100.00M
    Maximum Processes Limit: 4194305

set memory.swappiness to 0,swap space will not be used
https://www.kernel.org/doc/Documentation/cgroup-v1/memory.txt

Memory & Swap Limit should be 50.00M

test case:
cgcreate -g memory:foo1
cd /sys/fs/cgroup/memory/foo1
echo 52428800 > memory.limit_in_bytes
echo 104857600 > memory.memsw.limit_in_bytes
memory.swappiness default value is 60
cgexec -g memory:foo1 java -XshowSettings:system -Xms60m -XX:+AlwaysPreTouch -version (success)


echo 0 > memory.swappiness

cgexec -g memory:foo1 java -XshowSettings:system -Xms60m -XX:+AlwaysPreTouch -version (killed)