RFR: 8284950: Swappiness disables swap space usage

[Ioi Lam]

On Mon, 18 Apr 2022 09:07:31 GMT, xpbob <duke at openjdk.java.net> wrote:

> set memory.swappiness to 0,swap space will not be used 
> determine the value of memory.swappiness
> https://www.kernel.org/doc/Documentation/cgroup-v1/memory.txt
> 
> 
>     Memory Limit: 50.00M
>     Memory Soft Limit: Unlimited
>     Memory & Swap Limit: 100.00M
>     Maximum Processes Limit: 4194305 
> 
> =>
> 
>     Memory Limit: 50.00M
>     Memory Soft Limit: Unlimited
>     Memory & Swap Limit: 50.00M
>     Maximum Processes Limit: 4194305

I changed the [JBS issue](https://bugs.openjdk.java.net/browse/JDK-8284900) summary to "CgroupV1 detection code should consider memory.swappiness"

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