MREMAP_DONTUNMAP may be usable in realloc
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@ -16,6 +16,8 @@ Somewhat important and an easy sell:
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* also needed by jemalloc for different reasons
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* not needed if the kernel gets first class support for arbitrarily sized
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guard pages and a virtual memory quarantine feature
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* `MREMAP_DONTUNMAP` is now available but doesn't support expanding the
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mapping which may be an issue due to VMA merging being unreliable
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Fairly infeasible to land but could reduce overhead and extend coverage of
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security features to other code directly using mmap:
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