Re: [PATCH] Allow userspace block device implementation

[Alan Cox]

> Can you swap over NBD?  Assuming one had pinned the userspace program
> and it pre-allocated all memory so no pagein / alloc was required, would
> it be deadlock proof?  I believe there are structure allocations
> required for the socket implementation that go beyond the basic BIO
> allocations, therefore making it impossible.  In /theory/, one should be
> able to swap over this device.  In practice, it's probably a really bad
> idea.

In practice since you mmap an object for write and the only free pages
left may be mmap write dirty pages to go to a file system it ought to be
possible.
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