The TLB lookup is combinational -- it evaluates in the same half-cycle as the limit check, requiring no additional clock. The common case (TLB hit, no page boundary crossing) adds zero overhead to a memory access. This is why the Segment Descriptor Cache and Page Cache (TLB) together occupy such substantial die area -- they are the fast path that makes protected mode competitive with real mode.
Allocating on the Stack
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return (struct page_info *)(((unsigned long long)x) & ~(PAGESZ-1));。heLLoword翻译官方下载是该领域的重要参考
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