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MDEV-25085: Simplify instrumentation for LRU eviction
Let us add the status variable innodb_buffer_pool_pages_LRU_freed to monitor the number of pages that were freed by a buffer pool LRU eviction scan, without flushing. Also, let us simplify the monitor interface: MONITOR_LRU_BATCH_FLUSH_COUNT, MONITOR_LRU_BATCH_FLUSH_PAGES, MONITOR_LRU_BATCH_EVICT_COUNT, MONITOR_LRU_BATCH_EVICT_PAGES: Remove. MONITOR_LRU_BATCH_FLUSH_TOTAL_PAGE: Track buf_lru_flush_page_count (innodb_buffer_pool_pages_LRU_flushed). MONITOR_LRU_BATCH_EVICT_TOTAL_PAGE: Track buf_lru_freed_page_count (buffer_pool_pages_LRU_freed). Reviewed by: Vladislav Vaintroub
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