What surprised me was that this entire walk is fully hardware-driven -- no microcode involvement at all. The state machine reads the page directory entry, reads the page table entry, checks permissions, and writes back the Accessed and Dirty bits, all autonomously. Since it's hardware-driven, it runs in parallel with the microcode and needs its own memory bus arbitration -- the paging unit must share the bus with both data accesses from the microcode and prefetch requests from the instruction queue.
“坐牢”，是我对狗寄养生涯的戏称。
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Commit. You’ll certainly finish before the end of the timebox, that’s fine, stop the timer.
3.3 技术核心：JVM 怎么实现“卸载”？