[Haskell-cafe] rts nursery and stopping the world minor gc

I've been reading about garbage collection. I understand that is stop-the-world, parallel and generational. Per capability also exists "the nursery", which is a block of memory where new objects are allocated. When the nursery of a capability gets filled, do we have to stop-the-world just for that local nursery gc?. To me this is different than gen0 or gen1 gc because isn't really a shared resource. -- Ruben Astudillo.