[PATCH 0/3] mm: tracking dirty pages -v5

I hacked up a new version last night.

Its now based on top of David's patches, Hugh's approach of using the
MAP_PRIVATE protections instead of the MAP_SHARED seems far superior indeed.

Q: would it be feasable to do so for al shared mappings so we can remove
the MAP_SHARED protections all together?

They survive my simple testing, but esp. the msync cleanup might need some
more attention.

I post them now instead of after a little more testing because I'll not 
have much time the coming few days to do so, and hoarding them does 
nobody any good.

Peter
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