Added description for the new methods into the PersStats header

Former-commit-id: 2116ea47

Event/xAOD/xAODCore/xAODCore/tools/PerfStats.h

@@ -92,15 +92,28 @@ namespace xAOD {
 
 #if ROOT_VERSION_CODE >= ROOT_VERSION( 6, 14, 0 )
       // new methods (ROOT 6.14) - need forwarding to the original TPerfStats
+
+      /// Print the TTree basket read caching statistics
       virtual void PrintBasketInfo(Option_t *option = "") const;
+
+      /// Increase by 1 the counter of how many times a basket was cached
       virtual void SetLoaded(TBranch *b, size_t basketNumber);
       virtual void SetLoaded(size_t bi, size_t basketNumber);
+
+      /// Increase by 1 the counter of how many times a basket was cached on access
       virtual void SetLoadedMiss(TBranch *b, size_t basketNumber);
       virtual void SetLoadedMiss(size_t bi, size_t basketNumber);
+
+      /// Increase count (by 1) of not cached basket reads
       virtual void SetMissed(TBranch *b, size_t basketNumber);
       virtual void SetMissed(size_t bi, size_t basketNumber);
+
+      /// Mark a basket as accessed
       virtual void SetUsed(TBranch *b, size_t basketNumber);
       virtual void SetUsed(size_t bi, size_t basketNumber);
+
+      /// Update the fBranchIndexCache collection to match the current TTree given
+      /// the ordered list of branch names.
       virtual void UpdateBranchIndices(TObjArray *branches);
 #endif