return (PAGESZ - sizeof(struct page_info)) / sizes[classno];
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For implementers, backpressure adds complexity without providing guarantees. The machinery to track queue sizes, compute desiredSize, and invoke pull() at the right times must all be implemented correctly. However, since these signals are advisory, all that work doesn't actually prevent the problems backpressure is supposed to solve.，更多细节参见同城约会
tries to accommodate. The branch at which you have appeared can dispense cash,