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

[Yasumasa Suenaga]

On Wed, 26 Apr 2023 13:45:50 GMT, Roberto Castañeda Lozano <rcastanedalo at openjdk.org> wrote:

> > We could also just bypass the compiler thread creation question for now. Let the compiler continue to use the old metric when calculating its thread count, but let all other users of os::available_memory() the new one.
> 
> I agree, this could be the most pragmatic way forward.

Ok, so how do we implement that? It is better to add that function to `os` class like `os::free_memory()`, but it affects all of supported platforms. I think we can add static function for get "free memory" to compilerBroker.cpp . If it runs on Linux, it returns old metric, otherwise it delegates to `os::available_memory()`. Is it ok?

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PR Comment: https://git.openjdk.org/jdk/pull/13398#issuecomment-1523501016