Hello, let's say in my rootserver I need a contiguous block of memory 1 MB in size. I would request this memory from Sigma0 via L4_Sigma0_GetAny and get a single Flexpage of this size. In order to implement a fine-grained write-barrier on parts of this memory block, I need to make individual pages of this block read-only. As I understand it, the privileged system call MemoryControl provides this functionality, but: a) it is privileged, but all my servers would need this functionality. How is this efficiently accomplished? b) MemoryControl seems to operate on whole fpages only. How do I split a flexpage? Regards, -- Julian Stecklina "We were not out to win over the Lisp programmers; we were after the C++ programmers. We managed to drag a lot of them about halfway to Lisp." - Guy Steele, Java spec co-author