Benchmarking objrmap under memory pressure

[Martin J. Bligh]

UP Athlon 2100+ with 512Mb of RAM. Rebooted clean before each test
then did "make clean; make vmlinux; make clean". Then I timed a
"make -j 256 vmlinux" to get some testing under mem pressure. 

I was trying to test the overhead of objrmap under memory pressure,
but it seems it's actually distinctly negative overhead - rather pleasing
really ;-) 

2.6.5
225.18user 30.05system 6:33.72elapsed 64%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (37590major+2604444minor)pagefaults 0swaps

2.6.5-anon_mm
224.53user 26.00system 5:29.08elapsed 76%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (29127major+2577211minor)pagefaults 0swaps

2.6.5-aa5
224.35user 27.47system 5:35.09elapsed 75%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (28675major+2589179minor)pagefaults 0swaps

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