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* Re-organise RID allocation so that we don't accidentally give a RID to two different processes. Also randomise the order to try to reduce collisions in VHPT and TLB. Don't allocate RIDs for regions which are unused. * Allocate space for VHPT based on the size of physical memory. More tuning is needed here. * Add sysctl instrumentation for VHPT - see sysctl vm.stats.vhpt * Fix a bug in pmap_prefault() which prevented it from actually adding pages to the pmap. * Remove ancient dead debugging code. * Add DDB commands for examining translation registers and region registers. The first change fixes the 'free/cache page %p was dirty' panic which I have been seeing when the system is put under moderate load. It also fixes the negative RSS values in ps which have been confusing me for a while. With this set of changes the ia64 port is reliable enough to build its own kernels, even with a 20-way parallel build. Next stop buildworld.
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