In what segment does mmap allocate memory

Question

I thought first that it was the heap, but it seems to allocate memory in a different place. radare2 tags it as folowing:

0x00007fb07dacd000 - 0x00007fb07dace000 - usr 4K s rw- unk2 unk2

Since it is not the heap, what do we call the segment where mmapped memory is located?

Answer 1

I’m not sure it has a name as universal as “heap” for the heap, but I’ve seen it called the “memory-mapped segment” or “memory mapping segment”; see Do memory mapping segment and heap grow until they meet each other? for one example.