jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/g1Allocator.hpp@227a9e5e4b4a (annotated)

src/share/vm/gc_implementation/g1/g1Allocator.hpp@227a9e5e4b4a (annotated)

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

Fri, 05 Sep 2014 09:49:19 +0200

author: sjohanss
date: Fri, 05 Sep 2014 09:49:19 +0200
changeset 7118: 227a9e5e4b4a
child 7131: d35872270666
permissions: -rw-r--r--

8057536: Refactor G1 to allow context specific allocations
Summary: Splitting out a g1 allocator class to simply specialized allocators which can associate each allocation with a given context.
Reviewed-by: mgerdin, brutisso

 /*
  * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1ALLOCATOR_HPP
 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1ALLOCATOR_HPP
 #include "gc_implementation/g1/g1AllocationContext.hpp"
 #include "gc_implementation/g1/g1AllocRegion.hpp"
 #include "gc_implementation/shared/parGCAllocBuffer.hpp"
 enum GCAllocPurpose {
   GCAllocForTenured,
   GCAllocForSurvived,
   GCAllocPurposeCount
 };
 // Base class for G1 allocators.
 class G1Allocator : public CHeapObj<mtGC> {
   friend class VMStructs;
 protected:
   G1CollectedHeap* _g1h;
   // Outside of GC pauses, the number of bytes used in all regions other
   // than the current allocation region.
   size_t _summary_bytes_used;
 public:
    G1Allocator(G1CollectedHeap* heap) :
      _g1h(heap), _summary_bytes_used(0) { }
    static G1Allocator* create_allocator(G1CollectedHeap* g1h);
    virtual void init_mutator_alloc_region() = 0;
    virtual void release_mutator_alloc_region() = 0;
    virtual void init_gc_alloc_regions(EvacuationInfo& evacuation_info) = 0;
    virtual void release_gc_alloc_regions(uint no_of_gc_workers, EvacuationInfo& evacuation_info) = 0;
    virtual void abandon_gc_alloc_regions() = 0;
    virtual MutatorAllocRegion*    mutator_alloc_region(AllocationContext_t context) = 0;
    virtual SurvivorGCAllocRegion* survivor_gc_alloc_region(AllocationContext_t context) = 0;
    virtual OldGCAllocRegion*      old_gc_alloc_region(AllocationContext_t context) = 0;
    virtual size_t                 used() = 0;
    virtual bool                   is_retained_old_region(HeapRegion* hr) = 0;
    void                           reuse_retained_old_region(EvacuationInfo& evacuation_info,
                                                             OldGCAllocRegion* old,
                                                             HeapRegion** retained);
    size_t used_unlocked() const {
      return _summary_bytes_used;
    }
    void increase_used(size_t bytes) {
      _summary_bytes_used += bytes;
    }
    void decrease_used(size_t bytes) {
      assert(_summary_bytes_used >= bytes,
             err_msg("invariant: _summary_bytes_used: "SIZE_FORMAT" should be >= bytes: "SIZE_FORMAT,
                 _summary_bytes_used, bytes));
      _summary_bytes_used -= bytes;
    }
    void set_used(size_t bytes) {
      _summary_bytes_used = bytes;
    }
 };
 // The default allocator for G1.
 class G1DefaultAllocator : public G1Allocator {
 protected:
   // Alloc region used to satisfy mutator allocation requests.
   MutatorAllocRegion _mutator_alloc_region;
   // Alloc region used to satisfy allocation requests by the GC for
   // survivor objects.
   SurvivorGCAllocRegion _survivor_gc_alloc_region;
   // Alloc region used to satisfy allocation requests by the GC for
   // old objects.
   OldGCAllocRegion _old_gc_alloc_region;
   HeapRegion* _retained_old_gc_alloc_region;
 public:
   G1DefaultAllocator(G1CollectedHeap* heap) : G1Allocator(heap), _retained_old_gc_alloc_region(NULL) { }
   virtual void init_mutator_alloc_region();
   virtual void release_mutator_alloc_region();
   virtual void init_gc_alloc_regions(EvacuationInfo& evacuation_info);
   virtual void release_gc_alloc_regions(uint no_of_gc_workers, EvacuationInfo& evacuation_info);
   virtual void abandon_gc_alloc_regions();
   virtual bool is_retained_old_region(HeapRegion* hr) {
     return _retained_old_gc_alloc_region == hr;
   }
   virtual MutatorAllocRegion* mutator_alloc_region(AllocationContext_t context) {
     return &_mutator_alloc_region;
   }
   virtual SurvivorGCAllocRegion* survivor_gc_alloc_region(AllocationContext_t context) {
     return &_survivor_gc_alloc_region;
   }
   virtual OldGCAllocRegion* old_gc_alloc_region(AllocationContext_t context) {
     return &_old_gc_alloc_region;
   }
   virtual size_t used() {
     assert(Heap_lock->owner() != NULL,
            "Should be owned on this thread's behalf.");
     size_t result = _summary_bytes_used;
     // Read only once in case it is set to NULL concurrently
     HeapRegion* hr = mutator_alloc_region(AllocationContext::current())->get();
     if (hr != NULL) {
       result += hr->used();
     }
     return result;
   }
 };
 class G1ParGCAllocBuffer: public ParGCAllocBuffer {
 private:
   bool _retired;
 public:
   G1ParGCAllocBuffer(size_t gclab_word_size);
   virtual ~G1ParGCAllocBuffer() {
     guarantee(_retired, "Allocation buffer has not been retired");
   }
   virtual void set_buf(HeapWord* buf) {
     ParGCAllocBuffer::set_buf(buf);
     _retired = false;
   }
   virtual void retire(bool end_of_gc, bool retain) {
     if (_retired) {
       return;
     }
     ParGCAllocBuffer::retire(end_of_gc, retain);
     _retired = true;
   }
 };
 class G1ParGCAllocator : public CHeapObj<mtGC> {
   friend class G1ParScanThreadState;
 protected:
   G1CollectedHeap* _g1h;
   size_t _alloc_buffer_waste;
   size_t _undo_waste;
   void add_to_alloc_buffer_waste(size_t waste) { _alloc_buffer_waste += waste; }
   void add_to_undo_waste(size_t waste)         { _undo_waste += waste; }
   HeapWord* allocate_slow(GCAllocPurpose purpose, size_t word_sz, AllocationContext_t context);
   virtual void retire_alloc_buffers() = 0;
   virtual G1ParGCAllocBuffer* alloc_buffer(GCAllocPurpose purpose, AllocationContext_t context) = 0;
 public:
   G1ParGCAllocator(G1CollectedHeap* g1h) :
     _g1h(g1h), _alloc_buffer_waste(0), _undo_waste(0) {
   }
   static G1ParGCAllocator* create_allocator(G1CollectedHeap* g1h);
   size_t alloc_buffer_waste() { return _alloc_buffer_waste; }
   size_t undo_waste() {return _undo_waste; }
   HeapWord* allocate(GCAllocPurpose purpose, size_t word_sz, AllocationContext_t context) {
     HeapWord* obj = NULL;
     if (purpose == GCAllocForSurvived) {
       obj = alloc_buffer(purpose, context)->allocate_aligned(word_sz, SurvivorAlignmentInBytes);
     } else {
       obj = alloc_buffer(purpose, context)->allocate(word_sz);
     }
     if (obj != NULL) {
       return obj;
     }
     return allocate_slow(purpose, word_sz, context);
   }
   void undo_allocation(GCAllocPurpose purpose, HeapWord* obj, size_t word_sz, AllocationContext_t context) {
     if (alloc_buffer(purpose, context)->contains(obj)) {
       assert(alloc_buffer(purpose, context)->contains(obj + word_sz - 1),
              "should contain whole object");
       alloc_buffer(purpose, context)->undo_allocation(obj, word_sz);
     } else {
       CollectedHeap::fill_with_object(obj, word_sz);
       add_to_undo_waste(word_sz);
     }
   }
 };
 class G1DefaultParGCAllocator : public G1ParGCAllocator {
   G1ParGCAllocBuffer  _surviving_alloc_buffer;
   G1ParGCAllocBuffer  _tenured_alloc_buffer;
   G1ParGCAllocBuffer* _alloc_buffers[GCAllocPurposeCount];
 public:
   G1DefaultParGCAllocator(G1CollectedHeap* g1h);
   virtual G1ParGCAllocBuffer* alloc_buffer(GCAllocPurpose purpose, AllocationContext_t context) {
     return _alloc_buffers[purpose];
   }
   virtual void retire_alloc_buffers() ;
 };
 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1ALLOCATOR_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/gc_implementation/g1/g1Allocator.hpp@227a9e5e4b4a (annotated)

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