-mm seems significanty slower than mainline on kernbench

[Martin Bligh]

OK, I fixed the graphs so you can actually read them now ;-)

http://test.kernel.org/perf/kernbench.elm3b6.png (x86_64 4x)
http://test.kernel.org/perf/kernbench.moe.png (NUMA-Q)
http://test.kernel.org/perf/kernbench.elm3b132.png (4x SMP ia32)

Both seems significantly slower on -mm (mm is green line)

If I look at diffprofile between 2.6.15 and 2.6.15-mm1, it just looks
like we have lots more idle time. You got strange scheduler changes in
there, that you've been carrying for a long time (2.6.14-mm1 at least)? 
or HZ piddling? See to be mainly getting much more idle time.

Diffprofile:

      1278    39.6% default_idle
      1261    10.1% total
       243  1518.8% find_get_page
       220     0.0% copy_user_generic
       100   357.1% free_hot_cold_page
...
      -106   -93.0% __pagevec_free
      -125  -100.0% __free_pages_ok
      -239  -100.0% copy_user_generic_c
      -242  -100.0% find_trylock_page

Original profiles:
http://test.kernel.org/19657/002.kernbench.test/profiling/profile.text 
(2.6.15)
http://test.kernel.org/19794/002.kernbench.test/profiling/profile.text
(2.6.15-mm1)

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