jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/g1Allocator.hpp@d35872270666

8057658: Enable G1 FullGC extensions
Summary: Refactored the G1 FullGC code to enable it to be extended.
Reviewed-by: mgerdin, brutisso

     1 /*

     2  * Copyright (c) 2014, 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_GC_IMPLEMENTATION_G1_G1ALLOCATOR_HPP

    26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1ALLOCATOR_HPP

    28 #include "gc_implementation/g1/g1AllocationContext.hpp"

    29 #include "gc_implementation/g1/g1AllocRegion.hpp"

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

    32 enum GCAllocPurpose {

    33   GCAllocForTenured,

    34   GCAllocForSurvived,

    35   GCAllocPurposeCount

    36 };

    38 // Base class for G1 allocators.

    39 class G1Allocator : public CHeapObj<mtGC> {

    40   friend class VMStructs;

    41 protected:

    42   G1CollectedHeap* _g1h;

    44   // Outside of GC pauses, the number of bytes used in all regions other

    45   // than the current allocation region.

    46   size_t _summary_bytes_used;

    48 public:

    49    G1Allocator(G1CollectedHeap* heap) :

    50      _g1h(heap), _summary_bytes_used(0) { }

    52    static G1Allocator* create_allocator(G1CollectedHeap* g1h);

    54    virtual void init_mutator_alloc_region() = 0;

    55    virtual void release_mutator_alloc_region() = 0;

    57    virtual void init_gc_alloc_regions(EvacuationInfo& evacuation_info) = 0;

    58    virtual void release_gc_alloc_regions(uint no_of_gc_workers, EvacuationInfo& evacuation_info) = 0;

    59    virtual void abandon_gc_alloc_regions() = 0;

    61    virtual MutatorAllocRegion*    mutator_alloc_region(AllocationContext_t context) = 0;

    62    virtual SurvivorGCAllocRegion* survivor_gc_alloc_region(AllocationContext_t context) = 0;

    63    virtual OldGCAllocRegion*      old_gc_alloc_region(AllocationContext_t context) = 0;

    64    virtual size_t                 used() = 0;

    65    virtual bool                   is_retained_old_region(HeapRegion* hr) = 0;

    67    void                           reuse_retained_old_region(EvacuationInfo& evacuation_info,

    68                                                             OldGCAllocRegion* old,

    69                                                             HeapRegion** retained);

    71    size_t used_unlocked() const {

    72      return _summary_bytes_used;

    73    }

    75    void increase_used(size_t bytes) {

    76      _summary_bytes_used += bytes;

    77    }

    79    void decrease_used(size_t bytes) {

    80      assert(_summary_bytes_used >= bytes,

    81             err_msg("invariant: _summary_bytes_used: "SIZE_FORMAT" should be >= bytes: "SIZE_FORMAT,

    82                 _summary_bytes_used, bytes));

    83      _summary_bytes_used -= bytes;

    84    }

    86    void set_used(size_t bytes) {

    87      _summary_bytes_used = bytes;

    88    }

    90    virtual HeapRegion* new_heap_region(uint hrs_index,

    91                                        G1BlockOffsetSharedArray* sharedOffsetArray,

    92                                        MemRegion mr) {

    93      return new HeapRegion(hrs_index, sharedOffsetArray, mr);

    94    }

    95 };

    97 // The default allocator for G1.

    98 class G1DefaultAllocator : public G1Allocator {

    99 protected:

   100   // Alloc region used to satisfy mutator allocation requests.

   101   MutatorAllocRegion _mutator_alloc_region;

   103   // Alloc region used to satisfy allocation requests by the GC for

   104   // survivor objects.

   105   SurvivorGCAllocRegion _survivor_gc_alloc_region;

   107   // Alloc region used to satisfy allocation requests by the GC for

   108   // old objects.

   109   OldGCAllocRegion _old_gc_alloc_region;

   111   HeapRegion* _retained_old_gc_alloc_region;

   112 public:

   113   G1DefaultAllocator(G1CollectedHeap* heap) : G1Allocator(heap), _retained_old_gc_alloc_region(NULL) { }

   115   virtual void init_mutator_alloc_region();

   116   virtual void release_mutator_alloc_region();

   118   virtual void init_gc_alloc_regions(EvacuationInfo& evacuation_info);

   119   virtual void release_gc_alloc_regions(uint no_of_gc_workers, EvacuationInfo& evacuation_info);

   120   virtual void abandon_gc_alloc_regions();

   122   virtual bool is_retained_old_region(HeapRegion* hr) {

   123     return _retained_old_gc_alloc_region == hr;

   124   }

   126   virtual MutatorAllocRegion* mutator_alloc_region(AllocationContext_t context) {

   127     return &_mutator_alloc_region;

   128   }

   130   virtual SurvivorGCAllocRegion* survivor_gc_alloc_region(AllocationContext_t context) {

   131     return &_survivor_gc_alloc_region;

   132   }

   134   virtual OldGCAllocRegion* old_gc_alloc_region(AllocationContext_t context) {

   135     return &_old_gc_alloc_region;

   136   }

   138   virtual size_t used() {

   139     assert(Heap_lock->owner() != NULL,

   140            "Should be owned on this thread's behalf.");

   141     size_t result = _summary_bytes_used;

   143     // Read only once in case it is set to NULL concurrently

   144     HeapRegion* hr = mutator_alloc_region(AllocationContext::current())->get();

   145     if (hr != NULL) {

   146       result += hr->used();

   147     }

   148     return result;

   149   }

   150 };

   152 class G1ParGCAllocBuffer: public ParGCAllocBuffer {

   153 private:

   154   bool _retired;

   156 public:

   157   G1ParGCAllocBuffer(size_t gclab_word_size);

   158   virtual ~G1ParGCAllocBuffer() {

   159     guarantee(_retired, "Allocation buffer has not been retired");

   160   }

   162   virtual void set_buf(HeapWord* buf) {

   163     ParGCAllocBuffer::set_buf(buf);

   164     _retired = false;

   165   }

   167   virtual void retire(bool end_of_gc, bool retain) {

   168     if (_retired) {

   169       return;

   170     }

   171     ParGCAllocBuffer::retire(end_of_gc, retain);

   172     _retired = true;

   173   }

   174 };

   176 class G1ParGCAllocator : public CHeapObj<mtGC> {

   177   friend class G1ParScanThreadState;

   178 protected:

   179   G1CollectedHeap* _g1h;

   181   size_t _alloc_buffer_waste;

   182   size_t _undo_waste;

   184   void add_to_alloc_buffer_waste(size_t waste) { _alloc_buffer_waste += waste; }

   185   void add_to_undo_waste(size_t waste)         { _undo_waste += waste; }

   187   HeapWord* allocate_slow(GCAllocPurpose purpose, size_t word_sz, AllocationContext_t context);

   189   virtual void retire_alloc_buffers() = 0;

   190   virtual G1ParGCAllocBuffer* alloc_buffer(GCAllocPurpose purpose, AllocationContext_t context) = 0;

   192 public:

   193   G1ParGCAllocator(G1CollectedHeap* g1h) :

   194     _g1h(g1h), _alloc_buffer_waste(0), _undo_waste(0) {

   195   }

   197   static G1ParGCAllocator* create_allocator(G1CollectedHeap* g1h);

   199   size_t alloc_buffer_waste() { return _alloc_buffer_waste; }

   200   size_t undo_waste() {return _undo_waste; }

   202   HeapWord* allocate(GCAllocPurpose purpose, size_t word_sz, AllocationContext_t context) {

   203     HeapWord* obj = NULL;

   204     if (purpose == GCAllocForSurvived) {

   205       obj = alloc_buffer(purpose, context)->allocate_aligned(word_sz, SurvivorAlignmentInBytes);

   206     } else {

   207       obj = alloc_buffer(purpose, context)->allocate(word_sz);

   208     }

   209     if (obj != NULL) {

   210       return obj;

   211     }

   212     return allocate_slow(purpose, word_sz, context);

   213   }

   215   void undo_allocation(GCAllocPurpose purpose, HeapWord* obj, size_t word_sz, AllocationContext_t context) {

   216     if (alloc_buffer(purpose, context)->contains(obj)) {

   217       assert(alloc_buffer(purpose, context)->contains(obj + word_sz - 1),

   218              "should contain whole object");

   219       alloc_buffer(purpose, context)->undo_allocation(obj, word_sz);

   220     } else {

   221       CollectedHeap::fill_with_object(obj, word_sz);

   222       add_to_undo_waste(word_sz);

   223     }

   224   }

   225 };

   227 class G1DefaultParGCAllocator : public G1ParGCAllocator {

   228   G1ParGCAllocBuffer  _surviving_alloc_buffer;

   229   G1ParGCAllocBuffer  _tenured_alloc_buffer;

   230   G1ParGCAllocBuffer* _alloc_buffers[GCAllocPurposeCount];

   232 public:

   233   G1DefaultParGCAllocator(G1CollectedHeap* g1h);

   235   virtual G1ParGCAllocBuffer* alloc_buffer(GCAllocPurpose purpose, AllocationContext_t context) {

   236     return _alloc_buffers[purpose];

   237   }

   239   virtual void retire_alloc_buffers() ;

   240 };

   242 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1ALLOCATOR_HPP

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

src/share/vm/gc_implementation/g1/g1Allocator.hpp@d35872270666

src/share/vm/gc_implementation/g1/g1Allocator.hpp