RFR: 8305770: os::Linux::available_memory() should refer MemAvailable in /proc/meminfo [v2]

[David Holmes]

On Mon, 8 May 2023 08:42:53 GMT, Severin Gehwolf <sgehwolf at openjdk.org> wrote:

>> Yasumasa Suenaga has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Introduce os::free_memory
>
> src/hotspot/share/runtime/os.hpp line 314:
> 
>> 312: 
>> 313:   static julong available_memory();
>> 314:   static julong free_memory();
> 
> It would probably be a good idea to add a comment describing what the actual difference is between free/available (i.e. Linux only and usually `available memory > free memory` on such systems).

Yes some detailed commentary is very necessary. It looks very odd to have two functions that do the same thing on every platform but Linux.

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PR Review Comment: https://git.openjdk.org/jdk/pull/13398#discussion_r1188033176