Intel's 1986 ICCD paper Performance Optimizations of the 80386 reveals how tightly this was optimized. The entire address translation pipeline -- effective address calculation, segment relocation, and TLB lookup -- completes in 1.5 clock cycles:
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Snoop, test, redirect
For implementers, the locking model adds a fair amount of non-trivial internal bookkeeping. Every operation must check lock state, readers must be tracked, and the interplay between locks, cancellation, and error states creates a matrix of edge cases that must all be handled correctly.