jdk8-mips64-public/hotspot: src/share/vm/memory/tenuredGeneration.hpp@db9981fd3124

8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
Summary: Rename INCLUDE_ALTERNATE_GCS to INCLUDE_ALL_GCS and replace SERIALGC with INCLUDE_ALL_GCS.
Reviewed-by: coleenp, stefank

     1 /*

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     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

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    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  *

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

    18  *

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    25 #ifndef SHARE_VM_MEMORY_TENUREDGENERATION_HPP

    26 #define SHARE_VM_MEMORY_TENUREDGENERATION_HPP

    28 #include "gc_implementation/shared/cSpaceCounters.hpp"

    29 #include "gc_implementation/shared/gcStats.hpp"

    30 #include "gc_implementation/shared/generationCounters.hpp"

    31 #include "memory/generation.hpp"

    32 #include "utilities/macros.hpp"

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

    36 class ParGCAllocBufferWithBOT;

    38 class TenuredGeneration: public OneContigSpaceCardGeneration {

    39   friend class VMStructs;

    40  protected:

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

    42   size_t _shrink_factor;

    43   // Some statistics from before gc started.

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

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

    46   size_t _capacity_at_prologue;

    47   size_t _used_at_prologue;

    49 #if INCLUDE_ALL_GCS

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

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

    52   ParGCAllocBufferWithBOT** _alloc_buffers;

    53 #endif // INCLUDE_ALL_GCS

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

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

    57   void retire_alloc_buffers_before_full_gc();

    59   GenerationCounters*   _gen_counters;

    60   CSpaceCounters*       _space_counters;

    62  public:

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

    64                     GenRemSet* remset);

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

    68   // Printing

    69   const char* name() const;

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

    71   bool must_be_youngest() const { return false; }

    72   bool must_be_oldest() const { return true; }

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

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

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

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

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

    79   virtual bool full_collects_younger_generations() const {

    80     return !CollectGen0First;

    81   }

    83   // Mark sweep support

    84   void compute_new_size();

    86   virtual void gc_prologue(bool full);

    87   virtual void gc_epilogue(bool full);

    88   bool should_collect(bool   full,

    89                       size_t word_size,

    90                       bool   is_tlab);

    92   virtual void collect(bool full,

    93                        bool clear_all_soft_refs,

    94                        size_t size,

    95                        bool is_tlab);

    97 #if INCLUDE_ALL_GCS

    98   // Overrides.

    99   virtual oop par_promote(int thread_num,

   100                           oop obj, markOop m, size_t word_sz);

   101   virtual void par_promote_alloc_undo(int thread_num,

   102                                       HeapWord* obj, size_t word_sz);

   103   virtual void par_promote_alloc_done(int thread_num);

   104 #endif // INCLUDE_ALL_GCS

   106   // Performance Counter support

   107   void update_counters();

   109   // Statistics

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

   113   virtual bool promotion_attempt_is_safe(size_t max_promoted_in_bytes) const;

   115   void verify_alloc_buffers_clean();

   116 };

   118 #endif // SHARE_VM_MEMORY_TENUREDGENERATION_HPP

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

src/share/vm/memory/tenuredGeneration.hpp@db9981fd3124

src/share/vm/memory/tenuredGeneration.hpp