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be no major change in performance from this change at this time but this will allow other work to progress: Giant lock removal around VM system in favor of per-object mutexes, ranged fsyncs, more optimal COMMIT rpc's for NFS, partial filesystem syncs by the syncer, more optimal object flushing, etc. Note that the buffer cache is already using a similar splay tree mechanism. Note that a good chunk of the old hash table code is still in the tree. Alan or I will remove it prior to the release if the new code does not introduce unsolvable bugs, else we can revert more easily. Submitted by: alc (this is Alan's code) Approved by: re
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