Hello,

quoted

Moving file-backed pages is mostly handled already.  You can do a
regular page-cache lookup with find_get_page(), make your copy,
invalidate the old one, then readd the new one.  The invalidation can be
done in the same style as shrink_list().

Actually, it is a bit more complicated.
I have implemented similar functionality for memory hotremoval.

See my post about memory hotremoval
http://marc.theaimsgroup.com/?l=linux-kernel&m=107354781130941&w=2
for details.
remap_onepage() and remapd() in the patch are the main functions.

My patch may be one of the samples.
To allocate continuous pages on demand, I used remap_onepage() to
defragment pages.

http://www.ussg.iu.edu/hypermail/linux/kernel/0401.1/0045.html

Thank you,
Hirokazu Takahashi.
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