return (struct page_info *)(((unsigned long long)x) & ~(PAGESZ-1));
They all organize data by location so you can skip irrelevant regions, replacing "check everything" with "check the things that could possibly matter." That's what took us from a million comparisons to ten.
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Москвичей предупредили о резком похолодании09:45
// Even if the readable side's buffer is full, this succeeds
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