RFR: 8284950: CgroupV1 detection code should consider memory.swappiness [v15]

[Severin Gehwolf]

On Wed, 4 May 2022 01:37:27 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:
> 
>   update code

src/hotspot/os/linux/cgroupV1Subsystem_linux.cpp line 154:

> 152:       log_trace(os, container)("Memory and Swap Limit has been reset to " JULONG_FORMAT " because swappiness is 0", memlimit);
> 153:       return memlimit;
> 154:     }

It now occurs to me that we'd need the same treatment of this on line `143`. Perhaps extract a function and call it in both places?

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