RFR: 8284950: Swappiness disables swap space usage

[xpbob]

On Mon, 18 Apr 2022 16:25:17 GMT, Ioi Lam <iklam at openjdk.org> wrote:

>> src/java.base/linux/classes/jdk/internal/platform/cgroupv1/CgroupV1Subsystem.java line 155:
>> 
>>> 153:         long memswBytes = getLongValue(controller, "memory.memsw.limit_in_bytes");
>>> 154:         long swappiness = getLongValue(controller, "memory.swappiness");
>>> 155:         return (memswBytes > 0 && swappiness > 0);
>> 
>> Does this also need to be changed in the test?
>> 
>> https://github.com/openjdk/jdk/blob/c63fabe3d582ce0828b04b0224cea49aab5fedf3/test/lib/jdk/test/lib/containers/cgroup/MetricsTesterCgroupV1.java#L291-L296
>
> There's also corresponding code in HotSpot:
> 
> https://github.com/openjdk/jdk/blob/c63fabe3d582ce0828b04b0224cea49aab5fedf3/src/hotspot/os/linux/cgroupV1Subsystem_linux.cpp#L129-L150

> Does this also need to be changed in the test?
> 
> https://github.com/openjdk/jdk/blob/c63fabe3d582ce0828b04b0224cea49aab5fedf3/test/lib/jdk/test/lib/containers/cgroup/MetricsTesterCgroupV1.java#L291-L296


This condition returns false,The following code is skipped
https://github.com/openjdk/jdk/blob/c63fabe3d582ce0828b04b0224cea49aab5fedf3/test/lib/jdk/test/lib/containers/cgroup/MetricsTesterCgroupV1.java#L284

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PR: https://git.openjdk.java.net/jdk/pull/8285