get desiredSize() { return closed ? null : 1; },
PPT 的好坏见仁见智，我仅从能否在工作场景下使用来主观评判；
，详情可参考快连下载-Letsvpn下载
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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.