8246044: ZGC: Rename ZDirector's max_capacity to soft_max_capacity

Reviewed-by: stefank, eosterlund

src/hotspot/share/gc/z/zDirector.cpp

@@ -73,10 +73,10 @@ bool ZDirector::rule_warmup() const {
   // Perform GC if heap usage passes 10/20/30% and no other GC has been
   // performed yet. This allows us to get some early samples of the GC
   // duration, which is needed by the other rules.
-  const size_t max_capacity = ZHeap::heap()->soft_max_capacity();
+  const size_t soft_max_capacity = ZHeap::heap()->soft_max_capacity();
   const size_t used = ZHeap::heap()->used();
   const double used_threshold_percent = (ZStatCycle::nwarmup_cycles() + 1) * 0.1;
-  const size_t used_threshold = max_capacity * used_threshold_percent;
+  const size_t used_threshold = soft_max_capacity * used_threshold_percent;
 
   log_debug(gc, director)("Rule: Warmup %.0f%%, Used: " SIZE_FORMAT "MB, UsedThreshold: " SIZE_FORMAT "MB",
                           used_threshold_percent * 100, used / M, used_threshold / M);
@@ -99,10 +99,10 @@ bool ZDirector::rule_allocation_rate() const {
   // Calculate amount of free memory available to Java threads. Note that
   // the heap reserve is not available to Java threads and is therefore not
   // considered part of the free memory.
-  const size_t max_capacity = ZHeap::heap()->soft_max_capacity();
+  const size_t soft_max_capacity = ZHeap::heap()->soft_max_capacity();
   const size_t max_reserve = ZHeap::heap()->max_reserve();
   const size_t used = ZHeap::heap()->used();
-  const size_t free_with_reserve = max_capacity - MIN2(max_capacity, used);
+  const size_t free_with_reserve = soft_max_capacity - MIN2(soft_max_capacity, used);
   const size_t free = free_with_reserve - MIN2(free_with_reserve, max_reserve);
 
   // Calculate time until OOM given the max allocation rate and the amount
@@ -183,12 +183,12 @@ bool ZDirector::rule_high_usage() const {
   // Calculate amount of free memory available to Java threads. Note that
   // the heap reserve is not available to Java threads and is therefore not
   // considered part of the free memory.
-  const size_t max_capacity = ZHeap::heap()->soft_max_capacity();
+  const size_t soft_max_capacity = ZHeap::heap()->soft_max_capacity();
   const size_t max_reserve = ZHeap::heap()->max_reserve();
   const size_t used = ZHeap::heap()->used();
-  const size_t free_with_reserve = max_capacity - used;
+  const size_t free_with_reserve = soft_max_capacity - used;
   const size_t free = free_with_reserve - MIN2(free_with_reserve, max_reserve);
-  const double free_percent = percent_of(free, max_capacity);
+  const double free_percent = percent_of(free, soft_max_capacity);
 
   log_debug(gc, director)("Rule: High Usage, Free: " SIZE_FORMAT "MB(%.1f%%)",
                           free / M, free_percent);