jdk8-mips64-public/hotspot: src/share/vm/memory/tenuredGeneration.hpp@c18cbe5936b8

6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair

     1 /*

     2  * Copyright (c) 2001, 2008, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  *

    23  */

    25 // TenuredGeneration models the heap containing old (promoted/tenured) objects.

    27 class ParGCAllocBufferWithBOT;

    29 class TenuredGeneration: public OneContigSpaceCardGeneration {

    30   friend class VMStructs;

    31  protected:

    32   // current shrinking effect: this damps shrinking when the heap gets empty.

    33   size_t _shrink_factor;

    34   // Some statistics from before gc started.

    35   // These are gathered in the gc_prologue (and should_collect)

    36   // to control growing/shrinking policy in spite of promotions.

    37   size_t _capacity_at_prologue;

    38   size_t _used_at_prologue;

    40 #ifndef SERIALGC

    41   // To support parallel promotion: an array of parallel allocation

    42   // buffers, one per thread, initially NULL.

    43   ParGCAllocBufferWithBOT** _alloc_buffers;

    44 #endif // SERIALGC

    46   // Retire all alloc buffers before a full GC, so that they will be

    47   // re-allocated at the start of the next young GC.

    48   void retire_alloc_buffers_before_full_gc();

    50   GenerationCounters*   _gen_counters;

    51   CSpaceCounters*       _space_counters;

    53  public:

    54   TenuredGeneration(ReservedSpace rs, size_t initial_byte_size, int level,

    55                     GenRemSet* remset);

    57   Generation::Name kind() { return Generation::MarkSweepCompact; }

    59   // Printing

    60   const char* name() const;

    61   const char* short_name() const { return "Tenured"; }

    62   bool must_be_youngest() const { return false; }

    63   bool must_be_oldest() const { return true; }

    65   // Does a "full" (forced) collection invoked on this generation collect

    66   // all younger generations as well? Note that this is a

    67   // hack to allow the collection of the younger gen first if the flag is

    68   // set. This is better than using th policy's should_collect_gen0_first()

    69   // since that causes us to do an extra unnecessary pair of restart-&-stop-world.

    70   virtual bool full_collects_younger_generations() const {

    71     return !CollectGen0First;

    72   }

    74   // Mark sweep support

    75   void compute_new_size();

    77   virtual void gc_prologue(bool full);

    78   virtual void gc_epilogue(bool full);

    79   bool should_collect(bool   full,

    80                       size_t word_size,

    81                       bool   is_tlab);

    83   virtual void collect(bool full,

    84                        bool clear_all_soft_refs,

    85                        size_t size,

    86                        bool is_tlab);

    88 #ifndef SERIALGC

    89   // Overrides.

    90   virtual oop par_promote(int thread_num,

    91                           oop obj, markOop m, size_t word_sz);

    92   virtual void par_promote_alloc_undo(int thread_num,

    93                                       HeapWord* obj, size_t word_sz);

    94   virtual void par_promote_alloc_done(int thread_num);

    95 #endif // SERIALGC

    97   // Performance Counter support

    98   void update_counters();

   100   // Statistics

   102   virtual void update_gc_stats(int level, bool full);

   104   virtual bool promotion_attempt_is_safe(size_t max_promoted_in_bytes,

   105     bool younger_handles_promotion_failure) const;

   107   void verify_alloc_buffers_clean();

   108 };

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