jdk8-mips64-public/hotspot: src/share/vm/memory/tenuredGeneration.hpp@16fb9f942703

6479360: PrintClassHistogram improvements
Summary: jcmd <pid> GC.class_stats (UnlockDiagnosticVMOptions)
Reviewed-by: coleenp, hseigel, sla, acorn
Contributed-by: ioi.lam@oracle.com

     1 /*

     2  * Copyright (c) 2001, 2010, 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 #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"

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

    35 class ParGCAllocBufferWithBOT;

    37 class TenuredGeneration: public OneContigSpaceCardGeneration {

    38   friend class VMStructs;

    39  protected:

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

    41   size_t _shrink_factor;

    42   // Some statistics from before gc started.

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

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

    45   size_t _capacity_at_prologue;

    46   size_t _used_at_prologue;

    48 #ifndef SERIALGC

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

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

    51   ParGCAllocBufferWithBOT** _alloc_buffers;

    52 #endif // SERIALGC

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

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

    56   void retire_alloc_buffers_before_full_gc();

    58   GenerationCounters*   _gen_counters;

    59   CSpaceCounters*       _space_counters;

    61  public:

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

    63                     GenRemSet* remset);

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

    67   // Printing

    68   const char* name() const;

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

    70   bool must_be_youngest() const { return false; }

    71   bool must_be_oldest() const { return true; }

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

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

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

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

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

    78   virtual bool full_collects_younger_generations() const {

    79     return !CollectGen0First;

    80   }

    82   // Mark sweep support

    83   void compute_new_size();

    85   virtual void gc_prologue(bool full);

    86   virtual void gc_epilogue(bool full);

    87   bool should_collect(bool   full,

    88                       size_t word_size,

    89                       bool   is_tlab);

    91   virtual void collect(bool full,

    92                        bool clear_all_soft_refs,

    93                        size_t size,

    94                        bool is_tlab);

    96 #ifndef SERIALGC

    97   // Overrides.

    98   virtual oop par_promote(int thread_num,

    99                           oop obj, markOop m, size_t word_sz);

   100   virtual void par_promote_alloc_undo(int thread_num,

   101                                       HeapWord* obj, size_t word_sz);

   102   virtual void par_promote_alloc_done(int thread_num);

   103 #endif // SERIALGC

   105   // Performance Counter support

   106   void update_counters();

   108   // Statistics

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

   112   virtual bool promotion_attempt_is_safe(size_t max_promoted_in_bytes) const;

   114   void verify_alloc_buffers_clean();

   115 };

   117 #endif // SHARE_VM_MEMORY_TENUREDGENERATION_HPP

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

src/share/vm/memory/tenuredGeneration.hpp@16fb9f942703

src/share/vm/memory/tenuredGeneration.hpp