view src/share/vm/gc_implementation/g1/vm_operations_g1.hpp @ 1088:3fc996d4edd2

6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection Summary: ScavengeALot now causes an incremental (but possibly partially young, in the G1 sense) collection. Some such collections may be abandoned on account of MMU specs. Band-aided a native leak associated with abandoned pauses, as well as an MMU tracker overflow related to frequent scavenge events in the face of a large MMU denominator interval; the latter is protected by a product flag that defaults to false. Reviewed-by: tonyp
author ysr
date Thu, 19 Nov 2009 13:43:25 -0800
parents bd02caa94611
children
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/*
 * Copyright 2001-2009 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 *
 */

// VM_operations for the G1 collector.
// VM_GC_Operation:
//   - VM_CGC_Operation
//   - VM_G1CollectFull
//   - VM_G1CollectForAllocation
//   - VM_G1IncCollectionPause
//   - VM_G1PopRegionCollectionPause

class VM_G1CollectFull: public VM_GC_Operation {
 private:
 public:
  VM_G1CollectFull(int gc_count_before,
                   GCCause::Cause gc_cause)
    : VM_GC_Operation(gc_count_before)
  {
    _gc_cause = gc_cause;
  }
  ~VM_G1CollectFull() {}
  virtual VMOp_Type type() const { return VMOp_G1CollectFull; }
  virtual void doit();
  virtual const char* name() const {
    return "full garbage-first collection";
  }
};

class VM_G1CollectForAllocation: public VM_GC_Operation {
 private:
  HeapWord*   _res;
  size_t      _size;                       // size of object to be allocated
 public:
  VM_G1CollectForAllocation(size_t size, int gc_count_before)
    : VM_GC_Operation(gc_count_before) {
    _size        = size;
    _res         = NULL;
  }
  ~VM_G1CollectForAllocation()        {}
  virtual VMOp_Type type() const { return VMOp_G1CollectForAllocation; }
  virtual void doit();
  virtual const char* name() const {
    return "garbage-first collection to satisfy allocation";
  }
  HeapWord* result() { return _res; }
};

class VM_G1IncCollectionPause: public VM_GC_Operation {
 public:
  VM_G1IncCollectionPause(int gc_count_before,
                          GCCause::Cause gc_cause = GCCause::_g1_inc_collection_pause) :
    VM_GC_Operation(gc_count_before) { _gc_cause = gc_cause; }
  virtual VMOp_Type type() const { return VMOp_G1IncCollectionPause; }
  virtual void doit();
  virtual const char* name() const {
    return "garbage-first incremental collection pause";
  }
};

// Concurrent GC stop-the-world operations such as initial and final mark;
// consider sharing these with CMS's counterparts.
class VM_CGC_Operation: public VM_Operation {
  VoidClosure* _cl;
  const char* _printGCMessage;
 public:
  VM_CGC_Operation(VoidClosure* cl, const char *printGCMsg) :
    _cl(cl),
    _printGCMessage(printGCMsg)
    {}

  ~VM_CGC_Operation() {}

  virtual VMOp_Type type() const { return VMOp_CGC_Operation; }
  virtual void doit();
  virtual bool doit_prologue();
  virtual void doit_epilogue();
  virtual const char* name() const {
    return "concurrent gc";
  }
};