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What malloc does macOS use in userspace? How about kernel?

In NextSTEP 3, it was zoned-based allocation.

Rhapsody and early MacOS X, Darwin also used zone-based

Early iPhone also zone-based.

Later MacOS X implemented scalable zone, magazine allocator.

iPhone 12+ then went Nano allocator, ScalableZone + large/VM allocator

Latest iOS/iPadOS use Nano2

NanoV2 was only used for smaller size classes. The current allocator is xzone malloc: https://github.com/apple-oss-distributions/libmalloc/blob/ma...

Thanks, I needed that!