[joel_ms]

Are you sure about Haskell not having m:n threads? Because it's seems weird, considering GHC is listed as one of a few examples on wikipedia: https://en.m.wikipedia.org/wiki/Thread_(computing)#M:N_.28hy...

[weberc2]

No, I'm not sure. :) I may have incorrectly assumed that the definition of M:N threads includes movable application threads (e.g., Go's scheduler can move goroutines from one kernel thread to another).