The A/D bits exist entirely for the operating system's benefit. The Accessed bit tells the OS which pages have been recently used, enabling page replacement algorithms to choose pages to evict when memory runs low. The Dirty bit tells the OS which pages have been modified and must be written back to disk before eviction; clean pages can simply be discarded and re-read from disk later.
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港深通关后，香港夜总会遭受了巨大冲击，客源流失严重，大批本地客北上消费。“坐车一个多小时就到了，内地又便宜，300块一晚，香港1500块才3个钟头，客人就都跑了。”
For Michael, the battle appears to reflect a belief forged across his career—from Uber’s global expansion battles to the Pentagon’s AI buildup—that control over transformative technology cannot remain in private hands when national security is at stake. The question now is how far he’s willing to go to achieve that end.