Re: Merge of rmind-uvmplock branch

[yamt%mwd.biglobe.ne.jp@localhost (YAMAMOTO Takashi)]

hi,

> Hello,
> 
> Unless anyone objects, I will merge rmind-uvmplock branch.  The technical
> objectives of the branch are described here:
> 
> http://nxr.netbsd.org/xref/src/doc/BRANCHES?r=1.307#488

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.

YAMAMOTO Takashi

> 
> 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.
> 
> -- 
> Mindaugas