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* page_lru_count entries to be "reset" to lower values than they should have,
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* in case a process is delayed while it executes this macro. With care in
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* SlruSelectLRUPage(), this does little harm, and in any case the absolute
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* gain from allowing concurrent reads of SLRU pages seems worth it.
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#define SlruRecentlyUsed(shared, slotno) \