On Thu, 2011-06-23 at 23:11 -0700, Nitin Gupta wrote:

Much of this vpage functionality seems to be already present in mainline 
as "flexible arrays"[1] 

That's a good observation.  I don't know who wrote that junk, but I bet
they never thought of using it for this purpose. :)

FWIW, for flex_arrays, the biggest limitation is that the objects
currently can not cross page boundaries.  The current API also doesn't
have any concept of a release function.  We'd need those to do the
unmapping after a get().  It certainly wouldn't be impossible to fix,
but it would probably make it quite a bit more complicated.

The other limitation is that each array can only hold a small number of
megabytes worth of data in each array.  We only have a single-level
table lookup, and that first-level table is limited to PAGE_SIZE (minus
a wee bit of metadata).

-- Dave

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