Virtual memory and paging questions

[Barak Enat]

Hi all,   Note: Please reply to this mail as well because I'm not subscribed to this mailing list.   I have two questions regarding FreeBSD virtual memory and paging/swapping system:   1. When a page fault occurs does the entire system stalls, or only the process that requested the page suspends till the asynchronous completion of the page read?   2. If I create a memory disk (md) and later use it for swapping (sounds awkward - but still this is what I need...), when a page fault occurs does a physical memcopy happen from the md page to the main memory page, or is there a trick in the vm page mapping to actually use the same physical page from the md? If such a trick exist, where is it in the code (because I want to turn it off - I need the simple memcopy behaviour.)   Thanks in adavnce, Barak