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Besides showcasing the DSM registry, this prevents pg_prewarm from stealing from the main shared memory segment's extra buffer space when autoprewarm_start_worker() and autoprewarm_dump_now() are used without loading the module via shared_preload_libraries. Suggested-by: Michael Paquier Reviewed-by: Bharath Rupireddy Discussion: https://postgr.es/m/20231205034647.GA2705267%40nathanxps13