Tim Armstrong created IMPALA-6656:

             Summary: Metrics for time spent in BufferAllocator
                 Key: IMPALA-6656
                 URL: https://issues.apache.org/jira/browse/IMPALA-6656
             Project: IMPALA
          Issue Type: Improvement
          Components: Backend
            Reporter: Tim Armstrong
            Assignee: Tim Armstrong

We should track the total time spent and the time spent in TCMalloc so we can 
understand where time is going globally. 

I think we should shard these metrics across the arenas so we can see if the 
problem is just per-arena, and also to avoid contention between threads when 
updating the metrics.

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