We built the enhanced APIs to be generic [we think], without assumptions about the user-level code being a runtime, and focusing on the needed functionality and semantics. Our GC code is all in user space (part of the OpenJDK based code we put up along with the kernel mods) - it just needs some very scalable and somewhat different virtual and physical memory manipulation semantics form the kernel.
So yes, there can certainly be other uses for batched virtual memory operation with extremely fast commit times, and for other features like explicit-TLB-invalidate semantics (allowing user process to determine when a TLB invalidate is required, instead of issuing one per page), scalable virtual memory manipulation (not done under process-global lock), large page support that includes remapping capability, user-controlled shatter/unshatter transitions from large to small mappings while retaining large physical page layouts, etc.
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