Performance results / VM related SMP locking work - committed (2)

[Matthew Dillon <dillon@xxxxxxxxxxxxxxxxxxxx>]

    Here is an update with the quad buildworld tests on monster, with the
    latest commit.  Historical data.  Note that I fixed the improvement
    numbers, I was calculating them wrong.  100% improvement means half
    the time.

    Tests on monster (48 core opteron w/64G ram)

:monster buildworld -j 40 timings 4x prepatch:		(baseline)
:     8302.17 real      4629.97 user     17617.84 sys
:     8308.01 real      4716.70 user     22330.26 sys
:monster buildworld -j 40 timings 4x postpatch 1: 	(41.4% improvement)
:     5799.53 real      5254.76 user     23651.73 sys
:     5800.49 real      5314.23 user     23499.59 sys
:monster buildworld -j 40 timings 4x COMMIT#1: 		(93.4% improvement)
:     4207.85 real      4869.90 user     20673.71 sys
:     4248.45 real      4899.08 user     21697.11 sys

    And with the latest commit today (on first run after boot even!)

:monster buildworld -j 40 timings 4x COMMIT#2: 		(108% improvement) <<<
      3943.25 real      4630.76 user     21062.91 sys

    And I expect to do better yet.  Current system status:  We have one
    issue with a reproducable seg-fault/bus-fault related to mmap which
    I hope to squash today.

						-Matt