How to allocate stack
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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來自肯特郡的貝爾與其伴侶史蒂夫・鮑威爾（Steve Powell）向捐贈者及其家人的「善良與無私」致敬，感謝他們送出「不可思議的禮物」，同時也感謝牛津與倫敦的醫療團隊在整個過程提供支持。