RFR: JDK-8293114: JVM should trim the native heap [v7]

[Thomas Stuefe]

On Mon, 10 Jul 2023 10:54:11 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> Thomas Stuefe has updated the pull request incrementally with two additional commits since the last revision:
>> 
>>  - Add test with 1ms trim interval
>>  - No need for atomics
>
> src/hotspot/share/runtime/trimNativeHeap.cpp line 79:
> 
>> 77:   // in seconds
>> 78:   static double now() { return os::elapsedTime(); }
>> 79:   static double to_ms(double seconds) { return seconds * 1000.0; }
> 
> Would you like to just do it in `int64_t` representing milliseconds? The common way to get it is `nanos_to_millis(os::elapsed_counter())`.
> 
> Turning this to integer would also obviate stuff like `MAX2(1.0, now - time)`.

I would like to retain sub-ms precision for printing.

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PR Review Comment: https://git.openjdk.org/jdk/pull/14781#discussion_r1258230419