Use more accurate statistics for cursor cache totals

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    • Storage Engines 2018-12-03, Storage Engines 2018-12-17
    • None
    • v4.0, v3.6

      The current statistics used are not modified atomically, and are probably not so useful to use for a resource counter.  Over time, cache effects may cause a drift in the value.

      At the minimum, the current global count of cached statistics should be accurate (that is, incremented/decremented in an atomic way.  If there is a measurable performance hit by adding this, we could avoid changing the open_cursor_count metric when caching/reopening a cursor, and change the meaning of that metric to include cached cursors.

              Assignee:
              Donald Anderson
              Reporter:
              Donald Anderson
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