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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

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#ifndef SHARE_VM_GC_SHARED_AGETABLE_HPP

#define SHARE_VM_GC_SHARED_AGETABLE_HPP

#include "oops/markOop.hpp"

#include "oops/oop.hpp"

#include "runtime/perfData.hpp"

   See the LICENSE file for license information. */

// Age table for adaptive feedback-mediated tenuring (scavenging)

//

// Note: all sizes are in oops

  friend class VMStructs;

 public:

  // constants

  enum { table_size = markOopDesc::max_age + 1 };

  // instance variables

  size_t sizes[table_size];

  // constructor.  "global" indicates that this is the global age table

  // (as opposed to gc-thread-local)

  AgeTable(bool global = true);

  // clear table

  void clear();

  // add entry

  inline void add(oop p, size_t oop_size);

  void add(uint age, size_t oop_size) {

    assert(age > 0 && age < table_size, "invalid age of object");

    sizes[age] += oop_size;

  }

  // Merge another age table with the current one.  Used

  // for parallel young generation gc.

  void merge(AgeTable* subTable);

  // Calculate new tenuring threshold based on age information.

  uint compute_tenuring_threshold(size_t desired_survivor_size);

  void print_age_table(uint tenuring_threshold);

 private:

  PerfVariable* _perf_sizes[table_size];

};

#endif // SHARE_VM_GC_SHARED_AGETABLE_HPP