view src/share/vm/gc_implementation/g1/g1RemSetSummary.hpp @ 4769:e72f7eecc96d

8013895: G1: G1SummarizeRSetStats output on Linux needs improvemen Summary: Fixed the output of G1SummarizeRSetStats: too small datatype for the number of concurrently processed cards, added concurrent remembered set thread time retrieval for Linux and Windows (BSD uses os::elapsedTime() now), and other cleanup. The information presented during VM operation is now relative to the previous output, not always cumulative if G1SummarizeRSetStatsPeriod > 0. At VM exit, the code prints a cumulative summary. Reviewed-by: johnc, jwilhelm
author tschatzl
date Tue, 28 May 2013 09:32:06 +0200
children 7ec10139bf37
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 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit if you need additional information or have any
 * questions.


#include "utilities/ostream.hpp"

class G1RemSet;

// A G1RemSetSummary manages statistical information about the G1RemSet

class G1RemSetSummary VALUE_OBJ_CLASS_SPEC {
  friend class GetRSThreadVTimeClosure;

  G1RemSet* _remset;

  G1RemSet* remset() const {
    return _remset;

  size_t _num_refined_cards;
  size_t _num_processed_buf_mutator;
  size_t _num_processed_buf_rs_threads;

  size_t _num_coarsenings;

  double* _rs_threads_vtimes;
  size_t _num_vtimes;

  double _sampling_thread_vtime;

  void set_rs_thread_vtime(uint thread, double value);
  void set_sampling_thread_vtime(double value) {
    _sampling_thread_vtime = value;

  void free_and_null() {
    if (_rs_threads_vtimes) {
      FREE_C_HEAP_ARRAY(double, _rs_threads_vtimes, mtGC);
      _rs_threads_vtimes = NULL;
      _num_vtimes = 0;

  // update this summary with current data from various places
  void update();

  G1RemSetSummary() : _remset(NULL), _num_refined_cards(0),
    _num_processed_buf_mutator(0), _num_processed_buf_rs_threads(0), _num_coarsenings(0),
    _rs_threads_vtimes(NULL), _num_vtimes(0), _sampling_thread_vtime(0.0f) {

  ~G1RemSetSummary() {

  // set the counters in this summary to the values of the others
  void set(G1RemSetSummary* other);
  // subtract all counters from the other summary, and set them in the current
  void subtract_from(G1RemSetSummary* other);

  // initialize and get the first sampling
  void initialize(G1RemSet* remset, uint num_workers);

  void print_on(outputStream* out);

  double rs_thread_vtime(uint thread) const;

  double sampling_thread_vtime() const {
    return _sampling_thread_vtime;

  size_t num_concurrent_refined_cards() const {
    return _num_refined_cards;

  size_t num_processed_buf_mutator() const {
    return _num_processed_buf_mutator;

  size_t num_processed_buf_rs_threads() const {
    return _num_processed_buf_rs_threads;

  size_t num_processed_buf_total() const {
    return num_processed_buf_mutator() + num_processed_buf_rs_threads();

  size_t num_coarsenings() const {
    return _num_coarsenings;