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7011379: G1: overly long concurrent marking cycles Summary: This changeset introduces filtering of SATB buffers at the point when they are about to be enqueued. If this filtering clears enough entries on each buffer, the buffer can then be re-used and not enqueued. This cuts down the number of SATB buffers that need to be processed by the concurrent marking threads. Reviewed-by: johnc, ysr
author tonyp
date Wed, 19 Jan 2011 09:35:17 -0500
parents f95d63e2154a
children da91efe96a93
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/*
 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * 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 www.oracle.com if you need additional information or have any
 * questions.
 *
 */

#ifndef SHARE_VM_SERVICES_HEAPDUMPER_HPP
#define SHARE_VM_SERVICES_HEAPDUMPER_HPP

#include "memory/allocation.hpp"
#include "oops/klassOop.hpp"
#include "oops/oop.hpp"
#include "runtime/os.hpp"

// HeapDumper is used to dump the java heap to file in HPROF binary format:
//
//  { HeapDumper dumper(true /* full GC before heap dump */);
//    if (dumper.dump("/export/java.hprof")) {
//      ResourceMark rm;
//      tty->print_cr("Dump failed: %s", dumper.error_as_C_string());
//    } else {
//      // dump succeeded
//    }
//  }
//

class HeapDumper : public StackObj {
 private:
  char* _error;
  bool _print_to_tty;
  bool _gc_before_heap_dump;
  bool _oome;
  elapsedTimer _t;

  HeapDumper(bool gc_before_heap_dump, bool print_to_tty, bool oome) :
    _gc_before_heap_dump(gc_before_heap_dump), _error(NULL), _print_to_tty(print_to_tty), _oome(oome) { }

  // string representation of error
  char* error() const                   { return _error; }
  void set_error(char* error);

  // indicates if progress messages can be sent to tty
  bool print_to_tty() const             { return _print_to_tty; }

  // internal timer.
  elapsedTimer* timer()                 { return &_t; }

  static void dump_heap(bool oome);

 public:
  HeapDumper(bool gc_before_heap_dump) :
    _gc_before_heap_dump(gc_before_heap_dump), _error(NULL), _print_to_tty(false), _oome(false) { }

  ~HeapDumper();

  // dumps the heap to the specified file, returns 0 if success.
  int dump(const char* path);

  // returns error message (resource allocated), or NULL if no error
  char* error_as_C_string() const;

  static void dump_heap()    KERNEL_RETURN;

  static void dump_heap_from_oome()    KERNEL_RETURN;
};

#endif // SHARE_VM_SERVICES_HEAPDUMPER_HPP