Commits on Dec 10, 2019

1. logger: Check level before creating entry …

   Calling `time.Now()` and creating an entry is unnecessary
   if the underlying core has the specified level disabled.
   
   To reduce the cost of logs at disabled levels, skip entry
   creation if the log level is disabled in the core.
   
   This special logic does not apply to DPanic or higher logs as
   they may need to panic/exit even if the entry does not cause
   any log to be emitted.
   
   On my machine, disabled debugging logs are 6x (~60ns to ~10ns).
   
   Fixes #770.

   

   prashantv committed Dec 10, 2019
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