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Speedup max direct memory estimation via Unsafe #13643

Merged
merged 2 commits into from
Oct 2, 2023
Merged

Speedup max direct memory estimation via Unsafe #13643

merged 2 commits into from
Oct 2, 2023

Commits on Sep 28, 2023

  1. Speedup max direct memory estimation via Unsafe 

    Motivation:

PlatformDependent::estimateMaxDirectMemory reflectevly allocates MX Beans to
detect JVM's arg MaxDirectMemory (often failing to find any, because unconfigured).

Modifications:

Allow unsafe to find Bits's max memory static field and use it as a fast path to detect
the same direct memory limits used by the JVM runtime

Result:

Faster and less memory hungry (in term of mallocs) startup
    @franz1981
    franz1981 committed Sep 28, 2023
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  2. Avoid allocating MaxDirectSize arg's Pattern

    @franz1981
    franz1981 committed Sep 28, 2023
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