RFR: 8284950: CgroupV1 detection code should consider memory.swappiness [v16]

[xpbob]

On Thu, 12 May 2022 09:50:39 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
>
> xpbob has updated the pull request incrementally with one additional commit since the last revision:
> 
>   add swap method

Thanks for review.
@jerboaa 
I recently had a minor operation, so I couldn't get back on time.
Read values in different places, I added a method read_mem_swappiness
Is that possible?

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