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  1. JDK
  2. JDK-8259231

Epsilon: improve performance under contention during virtual space expansion

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    • gc
    • b05

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        This is on behalf of <lehuading@tencent.com>

        The `EpsilonHeap::allocate_work` method maybe can be fixed and improved by this:
        1. it can prevent allocate failure by retry `_space->par_allocate` before expanding virtual space, when there not enough virtual space but another thread expanding succeeded just and has enough space.
        2. it can reduce the lock time by move `res = _space->par_allocate(size);` out of lock scope.

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                shade Aleksey Shipilev
                jiefu Jie Fu
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