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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For full control over the pipeline:，详情可参考同城约会
但更多消费者期待的是新奇水果兼具好品质与适中价格。这种期待有可能成真吗？