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This set of changes removes the list of available buffers and instead simply uses the clock-sweep algorithm to find and return an available buffer. While on the surface this appears to be removing an optimization it is in fact eliminating code that induces overhead in the form of synchronization that is problemmatic for multi-core systems. This also removes the have_free_buffer() function and simply caps the pg_autoprewarm process to at most NBuffers.
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Draft PR opened to enable OCR AI review on the
cf-5928branch. Title/description are provisional — rename before publishing to pgsql-hackers.