mm improvements 0/5

Patches against 2.6.2-rc3-mm1.
Please test / review / comment.

1/5: vm-no-rss-limit.patch
     Remove broken RSS limiting. Simple problem, Rik is onto it.

2/5: vm-dont-rotate-active-list.patch
     Nikita's patch to keep more page ordering info in the active list.
     Also should improve system time due to less useless scanning
     Helps swapping loads significantly.

3/5: vm-lru-info.patch
     Keep more referenced info in the active list. Should also improve
     system time in some cases. Helps swapping loads significantly.

4/5: vm-fix-shrink-zone.patch
     Most significant part of this patch changes active / inactive
     balancing. This improves non swapping kbuild by a few %. Helps
     swapping significantly.

     It also contains a number of other small fixes which have little
     measurable impact on kbuild.

5/5: vm-tune-throttle.patch
     Try to allocate a bit harder before giving up / throttling on
     writeout.
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