Commits on Feb 8, 2021

1. plan: remove mutexes …

   The mutexes that were guarding the 'stats' section of plans in vtgate
   and vttablet were not being properly obeyed. A lot of the code was
   accessing the stats without acquiring the mutex first, mostly because
   there is no global consistency requirement between all the fields of the
   stats. Because of this, remove the Mutexes from both plans and switch to
   using Atomic operations to handle the stats fields. This reduces the
   sizes of the plans on cache and improves the accuracy of our memory
   usage metrics, since we do not have accurate size calculations for mutex
   objects, as they're foreign to the project.
   
   Signed-off-by: Vicent Marti <vmg@strn.cat>

   

   vmg committed Feb 8, 2021
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