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Re: Merge of rmind-uvmplock branch


> Hello,
> Unless anyone objects, I will merge rmind-uvmplock branch.  The technical
> objectives of the branch are described here:

the idea is to protect pv chains with object lock, right?
is the new locking protocol documented anywhere?

i'm curious about the consequence for O->A loaning.
or anything which can change the owner of pages.


> 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 ./ -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.
> -- 
> Mindaugas

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