src/hotspot/share/gc/g1/g1HeterogeneousHeapYoungGenSizer.cpp

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#include "precompiled.hpp"
#include "gc/g1/g1Arguments.hpp"
#include "gc/g1/g1HeterogeneousHeapYoungGenSizer.hpp"
#include "gc/g1/heapRegion.hpp"

G1HeterogeneousHeapYoungGenSizer::G1HeterogeneousHeapYoungGenSizer() : G1YoungGenSizer() {
  // will be used later when min and max young size is calculated.
  _max_young_length = (uint)(G1Arguments::reasonable_max_memory_for_young() / HeapRegion::GrainBytes);
}

// Since heap is sized potentially to larger value accounting for dram + nvdimm, we need to limit
// max young gen size to the available dram.
// Call parent class method first and then adjust sizes based on available dram
void G1HeterogeneousHeapYoungGenSizer::adjust_max_new_size(uint number_of_heap_regions) {
  G1YoungGenSizer::adjust_max_new_size(number_of_heap_regions);
  adjust_lengths_based_on_dram_memory();
}

void G1HeterogeneousHeapYoungGenSizer::heap_size_changed(uint new_number_of_heap_regions) {
  G1YoungGenSizer::heap_size_changed(new_number_of_heap_regions);
  adjust_lengths_based_on_dram_memory();
}

void G1HeterogeneousHeapYoungGenSizer::adjust_lengths_based_on_dram_memory() {
  _min_desired_young_length = MIN2(_min_desired_young_length, _max_young_length);
  _max_desired_young_length = MIN2(_max_desired_young_length, _max_young_length);
}