RFR: 8334489: Add function os::used_memory [v2]

[Erik Österlund]

On Wed, 19 Jun 2024 18:47:11 GMT, Severin Gehwolf <sgehwolf at openjdk.org> wrote:

> I don't understand. Now it's a linux only API? Wasn't the intention to have it available on all, but a shared impl for all except Linux, like in `os.cpp`?
> 
> 
> 
> Something like:
> 
> ```
> 
> LINUX_ONLY(static julong pd_used_memory();)
> 
> ...
> 
> julong os::used_memory() {
> 
> #ifdef LINUX
> 
>   return os::pd_used_memory();
> 
> #else
> 
>   return os::physical_memory() - os::available_memory();
> 
> #endif
> 
> }

That was indeed the intention.

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PR Review Comment: https://git.openjdk.org/jdk/pull/19772#discussion_r1646660171