Re: [PATCH] [Request for inclusion] Filesystem in Userspace

[Pavel Machek]

Hi!

> So I would go along the lines of 2).  However there is no way to know
> when pages are dirtied (ther is no fault), so accounting the dirty
> pages exactly is not possible.  However accounting the _writable_
> pages should be possible with no overhead, since there is a fault when
> the page of a mapping is first touched.

Ugh, this is going to be "interesting". Perhaps it can have little overhead,
but hacking pagefault handlers is going to be hard.
				Pavel
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