best scheme/lisp for real time code

Is Chicken a good idea? I am worried about the way it does GC. Exhausting the stack seems a bit... Java. I'm looking at Gambit too but I don't know much about it yet.

Whatever I end up using needs to work on ARM. It doesn't have to target C as long as it has FFI and short GC pauses (I am aiming for less than 5ms.)

>>14
I'm aware of the "arena" name for the concept.
I can think of a lot of situations where you need to allocate both short and long term/semi-permanent storage to solve a problem. Obvious example: the compiler needs to allocate short lived buffers for reading a file (ok, we can use mmap for this one), producing the parse tree, expanding macros, producing an internal representation like SSA, while at the same time "permanently" adding data to a long lived arena like the code being generated and the symbol associated with it. Sure, you can use separate object pools per task, but in a dynamic program like a compiler that just punts the task further down the road until you run out of space for e.g. symbols and need to make another allocation for more "permanent" storage.