hotspot/src/share/vm/gc/parallel/generationSizer.hpp
author tschatzl
Thu, 28 Jan 2016 13:30:12 +0100
changeset 35877 a2a62511d0f8
parent 30764 fec48bf5a827
child 37462 58bb9394a98b
permissions -rw-r--r--
8146987: Improve Parallel GC Full GC by caching results of live_words_in_range() Summary: A large part of time in the parallel scavenge collector is spent finding out the amount of live words within memory ranges to find out where to move an object to. Try to incrementally calculate this value. Reviewed-by: tschatzl, mgerdin, jmasa Contributed-by: ray alex <sky1young@gmail.com>

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#ifndef SHARE_VM_GC_PARALLEL_GENERATIONSIZER_HPP
#define SHARE_VM_GC_PARALLEL_GENERATIONSIZER_HPP

#include "gc/shared/collectorPolicy.hpp"

// There is a nice batch of tested generation sizing code in
// GenCollectorPolicy. Lets reuse it!

class GenerationSizer : public GenCollectorPolicy {
 private:

  void trace_gen_sizes(const char* const str);

  // The alignment used for boundary between young gen and old gen
  static size_t default_gen_alignment() { return 64 * K * HeapWordSize; }

 protected:

  void initialize_alignments();
  void initialize_flags();
  void initialize_size_info();
};
#endif // SHARE_VM_GC_PARALLEL_GENERATIONSIZER_HPP