Commits on Feb 6, 2024

1. Reset TLH sizing at first increment for CS …

   We reduce current refresh size at GC points, so that slow allocating
   threads have a chance to reduce their current refresh size.
   
   It's done toward the end of a GC cycle, which means that for Concurrent
   Scavegner it's done at the end of 2nd GC increment.
   
   However, it's slighty better to do it at the end of 1st increment since
   it will cuase TLH to be slighly smaller during concurrent phase of the
   cycle.
   
   During the concurrent phase there are other activities like GC
   background threads and read-barriers that effectively slow down the
   allocation rate of mutator threads, so there is less contention among
   them and less need for larger TLHs.
   
   Also, since allocate space is much smaller during concurrent phase of
   GC, smaller TLHs will lead to smaller discards for the last TLH refresh,
   which leads to more tilting and less frequent GC cycles.
   
   Signed-off-by: Aleksandar Micic <Aleksandar_Micic@ca.ibm.com>

   Aleksandar Micic authored and Aleksandar Micic committed Feb 6, 2024
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