Con Kolivas [off-list ref] wrote:

This started some time around 2.5.62-mm3 with the io_load results on contest 
benchmarking (http://contest.kolivas.org) rising with each run.
...
Mapped:       4294923652 kB

Well that's gotta hurt.  This metric is used in making writeback decisions. 
Probably the objrmap patch.

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