RFR: 8284950: CgroupV1 detection code should consider memory.swappiness [v14]

[Severin Gehwolf]

On Tue, 3 May 2022 13:38:07 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:
> 
>   revert file

This looks much better. Thanks!

test/hotspot/jtreg/containers/docker/TestMemoryWithCgroupV1.java line 52:

> 50:             return;
> 51:         }
> 52:         if ("cgroupv1".equals(metrics.getProvider())) {

Consider adding a an `else` clause with something like:
`System.out.println("Memory swappiness not supported with cgroups v2. Test skipped.");`

test/hotspot/jtreg/containers/docker/TestMemoryWithCgroupV1.java line 78:

> 76: 
> 77:         OutputAnalyzer out = Common.run(opts);
> 78:         System.out.println(out.getOutput());

This looks like debug output?

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