perf_counter: kerneltop: parse the mmap data stream

frob the kerneltop code to print the mmap data in the stream

Better use would be collecting the IPs per PID and mapping them onto
the provided userspace code.. TODO

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Paul Mackerras <paulus@samba.org>
Orig-LKML-Reference: <20090330171023.501902515@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>