Details
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Enhancement
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Resolution: Fixed
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P4
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8-shenandoah, 11.0.9, 16, 17
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b10
Description
ShenandoahHeap collects heap-wide statistics (used, committed, etc). It does so by atomically updating them with default CASes. Unfortunately, Hotspot's default for atomic operations is memory_order_conservative, which emits two-way memory fences around the CASes at least on AArch64 and PPC64.
This is excessive for statistics gathering, and "relaxed" should be jsut as good.
This is excessive for statistics gathering, and "relaxed" should be jsut as good.