Both page table entries and segment descriptors have an Accessed bit that the hardware must set on use -- but the mechanisms are quite different.
苹果产业已在20多个省份推广种植，从业人员达数千万。延安苹果产业基地县农民经营性收入61%来自苹果，200多万果农依“果”而富。2025年产季天水花牛苹果呈现出“价涨销畅”局面。
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Signed-off-by: Christophe de Dinechin
// promise to either yield a chunk of data or indicate we're