jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/concurrentMarkSweep/cmsCollectorPolicy.hpp@c96030fff130

6684579: SoftReference processing can be made more efficient
Summary: For current soft-ref clearing policies, we can decide at marking time if a soft-reference will definitely not be cleared, postponing the decision of whether it will definitely be cleared to the final reference processing phase. This can be especially beneficial in the case of concurrent collectors where the marking is usually concurrent but reference processing is usually not.
Reviewed-by: jmasa

     1 /*

     2  * Copyright (c) 2007 Sun Microsystems, Inc.  All Rights Reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

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

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  *

    23  */

    25 class ConcurrentMarkSweepPolicy : public TwoGenerationCollectorPolicy {

    26  protected:

    27   void initialize_generations();

    29  public:

    30   ConcurrentMarkSweepPolicy();

    32   ConcurrentMarkSweepPolicy* as_concurrent_mark_sweep_policy() { return this; }

    34   void initialize_gc_policy_counters();

    35 #if 1

    36   virtual void initialize_size_policy(size_t init_eden_size,

    37                                       size_t init_promo_size,

    38                                       size_t init_survivor_size);

    39 #endif

    41   // Returns true if the incremental mode is enabled.

    42   virtual bool has_soft_ended_eden();

    43 };

    45 class ASConcurrentMarkSweepPolicy : public ConcurrentMarkSweepPolicy {

    46  public:

    48   // Initialize the jstat counters.  This method requires a

    49   // size policy.  The size policy is expected to be created

    50   // after the generations are fully initialized so the

    51   // initialization of the counters need to be done post

    52   // the initialization of the generations.

    53   void initialize_gc_policy_counters();

    55   virtual CollectorPolicy::Name kind() {

    56     return CollectorPolicy::ASConcurrentMarkSweepPolicyKind;

    57   }

    58 };

Mercurial > jdk8-mips64-public > hotspot / file revision

src/share/vm/gc_implementation/concurrentMarkSweep/cmsCollectorPolicy.hpp@c96030fff130

src/share/vm/gc_implementation/concurrentMarkSweep/cmsCollectorPolicy.hpp