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  1. JDK
  2. JDK-8259231

Epsilon: improve performance under contention during virtual space expansion

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    • 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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            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8259769 Epsilon: improve performance under contention during virtual space expansion

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8262871 Epsilon: improve performance under contention during virtual space expansion

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8263284 Epsilon: improve performance under contention during virtual space expansion

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved
            links to

            Commit Commit openjdk/jdk16u/81395c4f

            Commit Commit openjdk/jdk/722f2361

            Review Review openjdk/jdk16u/66

            Review Review openjdk/jdk/1794

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                shade Aleksey Shipilev
                jiefu Jie Fu
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