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This commit adds CHECK_FOR_INTERRUPTS to loops iterating over shared buffers in several pg_buffercache functions, allowing them to be interrupted during long-running operations. Backpatch to all supported versions. Add CHECK_FOR_INTERRUPTS to the loop in pg_buffercache_pages() in all supported branches, and to pg_buffercache_summary() and pg_buffercache_usage_counts() in version 16 and newer. Author: SATYANARAYANA NARLAPURAM <satyanarlapuram@gmail.com> Discussion: https://postgr.es/m/CAHg+QDcejeLx7WunFT3DX6XKh1KshvGKa8F5au8xVhqVvvQPRw@mail.gmail.com Backpatch-through: 13