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$ make spin
$ ./qemu_lock_test
...
...
(100% cpu time used in `usr' because the locks used are spin-based)
...
...
took 12 seconds

$ qemu-x86_64 ./qemu_lock_test
...
...
(50% of cpu time used in `sys' for some reason)
...
...
...
(last forever...)

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Show how locks are slow in QEMU user mode

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