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Merge of rmind-uvmplock branch
Unless anyone objects, I will merge rmind-uvmplock branch. The technical
objectives of the branch are described here:
This results in:
- Rewritten x86 TLB handler, which is simpler and cleaner C code.
- UVM provides extra serialisation for pmap(9), therefore easier to make
implementations concurrent on other architectures, like sparc64.
- Reduced locking overhead and coalesced TLB shootdowns on x86, therefore
some performance improvement on such workloads like ./build.sh -j N.
- Unified /dev/mem et al, and overall changes cut ~3600 lines of code.
Thanks to Andrew Doran and Joerg Sonnenberger, as their initial patches
formed the core changes of this branch.
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