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Type:
Bug
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Status: Closed (View Workflow)
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Priority:
Major
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Resolution: Fixed
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Affects Version/s: 10.5
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Fix Version/s: 10.5.9
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Component/s: Storage Engine - InnoDB
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Labels:
The underlying variable of the counter innodb_buffer_pool_wait_free is only modified in buf_LRU_get_free_block(), where we could easily do that after acquiring buf_pool.mutex.
Furthermore, the variable is being duplicated for no good reason:
export_vars.innodb_buffer_pool_wait_free =
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srv_stats.buf_pool_wait_free;
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Because this counter should not be in a time-critical execution path, I think that we can replace both of the above variables with buf_pool.stat.LRU_waits, which would be incremented while holding buf_pool.mutex, to make the counter more accurate. I think that we can allow the reads to remain dirty, not acquiring the mutex.
- relates to
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MDEV-24350 buf_dblwr unnecessarily uses memory-intensive srv_stats counters
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- Closed
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