Hi, I changed UVM to allow for concurrent page faults on shared objects. Previously this was single threaded due to locking, which caused a lot of contention over busy objects like libc.so or PostgreSQL's shared buffer for example.
This works well for me on amd64, but I haven't tried it on other machines. >From code inspection I can see that some architectures need more work so this is disabled on them until I can make the needed changes: hppa, mips, powerpc and riscv. It's enabled everywhere else. I will keep an eye out for any bug reports. Thank you, Andrew
