sjohanss@7118: /*
sjohanss@7118:  * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
sjohanss@7118:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
sjohanss@7118:  *
sjohanss@7118:  * This code is free software; you can redistribute it and/or modify it
sjohanss@7118:  * under the terms of the GNU General Public License version 2 only, as
sjohanss@7118:  * published by the Free Software Foundation.
sjohanss@7118:  *
sjohanss@7118:  * This code is distributed in the hope that it will be useful, but WITHOUT
sjohanss@7118:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
sjohanss@7118:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
sjohanss@7118:  * version 2 for more details (a copy is included in the LICENSE file that
sjohanss@7118:  * accompanied this code).
sjohanss@7118:  *
sjohanss@7118:  * You should have received a copy of the GNU General Public License version
sjohanss@7118:  * 2 along with this work; if not, write to the Free Software Foundation,
sjohanss@7118:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
sjohanss@7118:  *
sjohanss@7118:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
sjohanss@7118:  * or visit www.oracle.com if you need additional information or have any
sjohanss@7118:  * questions.
sjohanss@7118:  *
sjohanss@7118:  */
sjohanss@7118: 
sjohanss@7118: #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1ALLOCATOR_HPP
sjohanss@7118: #define SHARE_VM_GC_IMPLEMENTATION_G1_G1ALLOCATOR_HPP
sjohanss@7118: 
sjohanss@7118: #include "gc_implementation/g1/g1AllocationContext.hpp"
sjohanss@7118: #include "gc_implementation/g1/g1AllocRegion.hpp"
sjohanss@7118: #include "gc_implementation/shared/parGCAllocBuffer.hpp"
sjohanss@7118: 
sjohanss@7118: enum GCAllocPurpose {
sjohanss@7118:   GCAllocForTenured,
sjohanss@7118:   GCAllocForSurvived,
sjohanss@7118:   GCAllocPurposeCount
sjohanss@7118: };
sjohanss@7118: 
sjohanss@7118: // Base class for G1 allocators.
sjohanss@7118: class G1Allocator : public CHeapObj<mtGC> {
sjohanss@7118:   friend class VMStructs;
sjohanss@7118: protected:
sjohanss@7118:   G1CollectedHeap* _g1h;
sjohanss@7118: 
sjohanss@7118:   // Outside of GC pauses, the number of bytes used in all regions other
sjohanss@7118:   // than the current allocation region.
sjohanss@7118:   size_t _summary_bytes_used;
sjohanss@7118: 
sjohanss@7118: public:
sjohanss@7118:    G1Allocator(G1CollectedHeap* heap) :
sjohanss@7118:      _g1h(heap), _summary_bytes_used(0) { }
sjohanss@7118: 
sjohanss@7118:    static G1Allocator* create_allocator(G1CollectedHeap* g1h);
sjohanss@7118: 
sjohanss@7118:    virtual void init_mutator_alloc_region() = 0;
sjohanss@7118:    virtual void release_mutator_alloc_region() = 0;
sjohanss@7118: 
sjohanss@7118:    virtual void init_gc_alloc_regions(EvacuationInfo& evacuation_info) = 0;
sjohanss@7118:    virtual void release_gc_alloc_regions(uint no_of_gc_workers, EvacuationInfo& evacuation_info) = 0;
sjohanss@7118:    virtual void abandon_gc_alloc_regions() = 0;
sjohanss@7118: 
sjohanss@7118:    virtual MutatorAllocRegion*    mutator_alloc_region(AllocationContext_t context) = 0;
sjohanss@7118:    virtual SurvivorGCAllocRegion* survivor_gc_alloc_region(AllocationContext_t context) = 0;
sjohanss@7118:    virtual OldGCAllocRegion*      old_gc_alloc_region(AllocationContext_t context) = 0;
sjohanss@7118:    virtual size_t                 used() = 0;
sjohanss@7118:    virtual bool                   is_retained_old_region(HeapRegion* hr) = 0;
sjohanss@7118: 
sjohanss@7118:    void                           reuse_retained_old_region(EvacuationInfo& evacuation_info,
sjohanss@7118:                                                             OldGCAllocRegion* old,
sjohanss@7118:                                                             HeapRegion** retained);
sjohanss@7118: 
sjohanss@7118:    size_t used_unlocked() const {
sjohanss@7118:      return _summary_bytes_used;
sjohanss@7118:    }
sjohanss@7118: 
sjohanss@7118:    void increase_used(size_t bytes) {
sjohanss@7118:      _summary_bytes_used += bytes;
sjohanss@7118:    }
sjohanss@7118: 
sjohanss@7118:    void decrease_used(size_t bytes) {
sjohanss@7118:      assert(_summary_bytes_used >= bytes,
sjohanss@7118:             err_msg("invariant: _summary_bytes_used: "SIZE_FORMAT" should be >= bytes: "SIZE_FORMAT,
sjohanss@7118:                 _summary_bytes_used, bytes));
sjohanss@7118:      _summary_bytes_used -= bytes;
sjohanss@7118:    }
sjohanss@7118: 
sjohanss@7118:    void set_used(size_t bytes) {
sjohanss@7118:      _summary_bytes_used = bytes;
sjohanss@7118:    }
sjohanss@7131: 
sjohanss@7131:    virtual HeapRegion* new_heap_region(uint hrs_index,
sjohanss@7131:                                        G1BlockOffsetSharedArray* sharedOffsetArray,
sjohanss@7131:                                        MemRegion mr) {
sjohanss@7131:      return new HeapRegion(hrs_index, sharedOffsetArray, mr);
sjohanss@7131:    }
sjohanss@7118: };
sjohanss@7118: 
sjohanss@7118: // The default allocator for G1.
sjohanss@7118: class G1DefaultAllocator : public G1Allocator {
sjohanss@7118: protected:
sjohanss@7118:   // Alloc region used to satisfy mutator allocation requests.
sjohanss@7118:   MutatorAllocRegion _mutator_alloc_region;
sjohanss@7118: 
sjohanss@7118:   // Alloc region used to satisfy allocation requests by the GC for
sjohanss@7118:   // survivor objects.
sjohanss@7118:   SurvivorGCAllocRegion _survivor_gc_alloc_region;
sjohanss@7118: 
sjohanss@7118:   // Alloc region used to satisfy allocation requests by the GC for
sjohanss@7118:   // old objects.
sjohanss@7118:   OldGCAllocRegion _old_gc_alloc_region;
sjohanss@7118: 
sjohanss@7118:   HeapRegion* _retained_old_gc_alloc_region;
sjohanss@7118: public:
sjohanss@7118:   G1DefaultAllocator(G1CollectedHeap* heap) : G1Allocator(heap), _retained_old_gc_alloc_region(NULL) { }
sjohanss@7118: 
sjohanss@7118:   virtual void init_mutator_alloc_region();
sjohanss@7118:   virtual void release_mutator_alloc_region();
sjohanss@7118: 
sjohanss@7118:   virtual void init_gc_alloc_regions(EvacuationInfo& evacuation_info);
sjohanss@7118:   virtual void release_gc_alloc_regions(uint no_of_gc_workers, EvacuationInfo& evacuation_info);
sjohanss@7118:   virtual void abandon_gc_alloc_regions();
sjohanss@7118: 
sjohanss@7118:   virtual bool is_retained_old_region(HeapRegion* hr) {
sjohanss@7118:     return _retained_old_gc_alloc_region == hr;
sjohanss@7118:   }
sjohanss@7118: 
sjohanss@7118:   virtual MutatorAllocRegion* mutator_alloc_region(AllocationContext_t context) {
sjohanss@7118:     return &_mutator_alloc_region;
sjohanss@7118:   }
sjohanss@7118: 
sjohanss@7118:   virtual SurvivorGCAllocRegion* survivor_gc_alloc_region(AllocationContext_t context) {
sjohanss@7118:     return &_survivor_gc_alloc_region;
sjohanss@7118:   }
sjohanss@7118: 
sjohanss@7118:   virtual OldGCAllocRegion* old_gc_alloc_region(AllocationContext_t context) {
sjohanss@7118:     return &_old_gc_alloc_region;
sjohanss@7118:   }
sjohanss@7118: 
sjohanss@7118:   virtual size_t used() {
sjohanss@7118:     assert(Heap_lock->owner() != NULL,
sjohanss@7118:            "Should be owned on this thread's behalf.");
sjohanss@7118:     size_t result = _summary_bytes_used;
sjohanss@7118: 
sjohanss@7118:     // Read only once in case it is set to NULL concurrently
sjohanss@7118:     HeapRegion* hr = mutator_alloc_region(AllocationContext::current())->get();
sjohanss@7118:     if (hr != NULL) {
sjohanss@7118:       result += hr->used();
sjohanss@7118:     }
sjohanss@7118:     return result;
sjohanss@7118:   }
sjohanss@7118: };
sjohanss@7118: 
sjohanss@7118: class G1ParGCAllocBuffer: public ParGCAllocBuffer {
sjohanss@7118: private:
sjohanss@7118:   bool _retired;
sjohanss@7118: 
sjohanss@7118: public:
sjohanss@7118:   G1ParGCAllocBuffer(size_t gclab_word_size);
sjohanss@7118:   virtual ~G1ParGCAllocBuffer() {
sjohanss@7118:     guarantee(_retired, "Allocation buffer has not been retired");
sjohanss@7118:   }
sjohanss@7118: 
sjohanss@7118:   virtual void set_buf(HeapWord* buf) {
sjohanss@7118:     ParGCAllocBuffer::set_buf(buf);
sjohanss@7118:     _retired = false;
sjohanss@7118:   }
sjohanss@7118: 
sjohanss@7118:   virtual void retire(bool end_of_gc, bool retain) {
sjohanss@7118:     if (_retired) {
sjohanss@7118:       return;
sjohanss@7118:     }
sjohanss@7118:     ParGCAllocBuffer::retire(end_of_gc, retain);
sjohanss@7118:     _retired = true;
sjohanss@7118:   }
sjohanss@7118: };
sjohanss@7118: 
sjohanss@7118: class G1ParGCAllocator : public CHeapObj<mtGC> {
sjohanss@7118:   friend class G1ParScanThreadState;
sjohanss@7118: protected:
sjohanss@7118:   G1CollectedHeap* _g1h;
sjohanss@7118: 
sjohanss@7118:   size_t _alloc_buffer_waste;
sjohanss@7118:   size_t _undo_waste;
sjohanss@7118: 
sjohanss@7118:   void add_to_alloc_buffer_waste(size_t waste) { _alloc_buffer_waste += waste; }
sjohanss@7118:   void add_to_undo_waste(size_t waste)         { _undo_waste += waste; }
sjohanss@7118: 
sjohanss@7118:   HeapWord* allocate_slow(GCAllocPurpose purpose, size_t word_sz, AllocationContext_t context);
sjohanss@7118: 
sjohanss@7118:   virtual void retire_alloc_buffers() = 0;
sjohanss@7118:   virtual G1ParGCAllocBuffer* alloc_buffer(GCAllocPurpose purpose, AllocationContext_t context) = 0;
sjohanss@7118: 
sjohanss@7118: public:
sjohanss@7118:   G1ParGCAllocator(G1CollectedHeap* g1h) :
sjohanss@7118:     _g1h(g1h), _alloc_buffer_waste(0), _undo_waste(0) {
sjohanss@7118:   }
sjohanss@7118: 
sjohanss@7118:   static G1ParGCAllocator* create_allocator(G1CollectedHeap* g1h);
sjohanss@7118: 
sjohanss@7118:   size_t alloc_buffer_waste() { return _alloc_buffer_waste; }
sjohanss@7118:   size_t undo_waste() {return _undo_waste; }
sjohanss@7118: 
sjohanss@7118:   HeapWord* allocate(GCAllocPurpose purpose, size_t word_sz, AllocationContext_t context) {
sjohanss@7118:     HeapWord* obj = NULL;
sjohanss@7118:     if (purpose == GCAllocForSurvived) {
sjohanss@7118:       obj = alloc_buffer(purpose, context)->allocate_aligned(word_sz, SurvivorAlignmentInBytes);
sjohanss@7118:     } else {
sjohanss@7118:       obj = alloc_buffer(purpose, context)->allocate(word_sz);
sjohanss@7118:     }
sjohanss@7118:     if (obj != NULL) {
sjohanss@7118:       return obj;
sjohanss@7118:     }
sjohanss@7118:     return allocate_slow(purpose, word_sz, context);
sjohanss@7118:   }
sjohanss@7118: 
sjohanss@7118:   void undo_allocation(GCAllocPurpose purpose, HeapWord* obj, size_t word_sz, AllocationContext_t context) {
sjohanss@7118:     if (alloc_buffer(purpose, context)->contains(obj)) {
sjohanss@7118:       assert(alloc_buffer(purpose, context)->contains(obj + word_sz - 1),
sjohanss@7118:              "should contain whole object");
sjohanss@7118:       alloc_buffer(purpose, context)->undo_allocation(obj, word_sz);
sjohanss@7118:     } else {
sjohanss@7118:       CollectedHeap::fill_with_object(obj, word_sz);
sjohanss@7118:       add_to_undo_waste(word_sz);
sjohanss@7118:     }
sjohanss@7118:   }
sjohanss@7118: };
sjohanss@7118: 
sjohanss@7118: class G1DefaultParGCAllocator : public G1ParGCAllocator {
sjohanss@7118:   G1ParGCAllocBuffer  _surviving_alloc_buffer;
sjohanss@7118:   G1ParGCAllocBuffer  _tenured_alloc_buffer;
sjohanss@7118:   G1ParGCAllocBuffer* _alloc_buffers[GCAllocPurposeCount];
sjohanss@7118: 
sjohanss@7118: public:
sjohanss@7118:   G1DefaultParGCAllocator(G1CollectedHeap* g1h);
sjohanss@7118: 
sjohanss@7118:   virtual G1ParGCAllocBuffer* alloc_buffer(GCAllocPurpose purpose, AllocationContext_t context) {
sjohanss@7118:     return _alloc_buffers[purpose];
sjohanss@7118:   }
sjohanss@7118: 
sjohanss@7118:   virtual void retire_alloc_buffers() ;
sjohanss@7118: };
sjohanss@7118: 
sjohanss@7118: #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1ALLOCATOR_HPP