src/share/vm/gc_implementation/g1/g1Allocator.hpp - platform/external/jetbrains/jdk8u_hotspot - Git at Google

 /*
  * 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/g1/g1InCSetState.hpp"
 #include "gc_implementation/shared/parGCAllocBuffer.hpp"

 // 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) { }
    virtual ~G1Allocator() {}

    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;
    }

    virtual HeapRegion* new_heap_region(uint hrs_index,
                                        G1BlockOffsetSharedArray* sharedOffsetArray,
                                        MemRegion mr) {
      return new HeapRegion(hrs_index, sharedOffsetArray, mr);
    }
 };

 // 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 ~G1DefaultAllocator() {}

   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;

   // The survivor alignment in effect in bytes.
   // == 0 : don't align survivors
   // != 0 : align survivors to that alignment
   // These values were chosen to favor the non-alignment case since some
   // architectures have a special compare against zero instructions.
   const uint _survivor_alignment_bytes;

   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; }

   virtual void retire_alloc_buffers() = 0;
   virtual G1ParGCAllocBuffer* alloc_buffer(InCSetState dest, AllocationContext_t context) = 0;

   // Calculate the survivor space object alignment in bytes. Returns that or 0 if
   // there are no restrictions on survivor alignment.
   static uint calc_survivor_alignment_bytes() {
     assert(SurvivorAlignmentInBytes >= ObjectAlignmentInBytes, "sanity");
     if (SurvivorAlignmentInBytes == ObjectAlignmentInBytes) {
       // No need to align objects in the survivors differently, return 0
       // which means "survivor alignment is not used".
       return 0;
     } else {
       assert(SurvivorAlignmentInBytes > 0, "sanity");
       return SurvivorAlignmentInBytes;
     }
   }

 public:
   G1ParGCAllocator(G1CollectedHeap* g1h) :
     _g1h(g1h), _survivor_alignment_bytes(calc_survivor_alignment_bytes()),
     _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; }

   // Allocate word_sz words in dest, either directly into the regions or by
   // allocating a new PLAB. Returns the address of the allocated memory, NULL if
   // not successful.
   HeapWord* allocate_direct_or_new_plab(InCSetState dest,
                                         size_t word_sz,
                                         AllocationContext_t context);

   // Allocate word_sz words in the PLAB of dest.  Returns the address of the
   // allocated memory, NULL if not successful.
   HeapWord* plab_allocate(InCSetState dest,
                           size_t word_sz,
                           AllocationContext_t context) {
     G1ParGCAllocBuffer* buffer = alloc_buffer(dest, context);
     if (_survivor_alignment_bytes == 0) {
       return buffer->allocate(word_sz);
     } else {
       return buffer->allocate_aligned(word_sz, _survivor_alignment_bytes);
     }
   }

   HeapWord* allocate(InCSetState dest, size_t word_sz,
                      AllocationContext_t context) {
     HeapWord* const obj = plab_allocate(dest, word_sz, context);
     if (obj != NULL) {
       return obj;
     }
     return allocate_direct_or_new_plab(dest, word_sz, context);
   }

   void undo_allocation(InCSetState dest, HeapWord* obj, size_t word_sz, AllocationContext_t context) {
     if (alloc_buffer(dest, context)->contains(obj)) {
       assert(alloc_buffer(dest, context)->contains(obj + word_sz - 1),
              "should contain whole object");
       alloc_buffer(dest, 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[InCSetState::Num];

 public:
   G1DefaultParGCAllocator(G1CollectedHeap* g1h);

   virtual G1ParGCAllocBuffer* alloc_buffer(InCSetState dest, AllocationContext_t context) {
     assert(dest.is_valid(),
            err_msg("Allocation buffer index out-of-bounds: " CSETSTATE_FORMAT, dest.value()));
     assert(_alloc_buffers[dest.value()] != NULL,
            err_msg("Allocation buffer is NULL: " CSETSTATE_FORMAT, dest.value()));
     return _alloc_buffers[dest.value()];
   }

   virtual void retire_alloc_buffers() ;
 };

 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1ALLOCATOR_HPP
	/*
	* 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/g1/g1InCSetState.hpp"
	#include "gc_implementation/shared/parGCAllocBuffer.hpp"

	// 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) { }
	virtual ~G1Allocator() {}

	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;
	}

	virtual HeapRegion* new_heap_region(uint hrs_index,
	G1BlockOffsetSharedArray* sharedOffsetArray,
	MemRegion mr) {
	return new HeapRegion(hrs_index, sharedOffsetArray, mr);
	}
	};

	// 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 ~G1DefaultAllocator() {}

	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;

	// The survivor alignment in effect in bytes.
	// == 0 : don't align survivors
	// != 0 : align survivors to that alignment
	// These values were chosen to favor the non-alignment case since some
	// architectures have a special compare against zero instructions.
	const uint _survivor_alignment_bytes;

	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; }

	virtual void retire_alloc_buffers() = 0;
	virtual G1ParGCAllocBuffer* alloc_buffer(InCSetState dest, AllocationContext_t context) = 0;

	// Calculate the survivor space object alignment in bytes. Returns that or 0 if
	// there are no restrictions on survivor alignment.
	static uint calc_survivor_alignment_bytes() {
	assert(SurvivorAlignmentInBytes >= ObjectAlignmentInBytes, "sanity");
	if (SurvivorAlignmentInBytes == ObjectAlignmentInBytes) {
	// No need to align objects in the survivors differently, return 0
	// which means "survivor alignment is not used".
	return 0;
	} else {
	assert(SurvivorAlignmentInBytes > 0, "sanity");
	return SurvivorAlignmentInBytes;
	}
	}

	public:
	G1ParGCAllocator(G1CollectedHeap* g1h) :
	_g1h(g1h), _survivor_alignment_bytes(calc_survivor_alignment_bytes()),
	_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; }

	// Allocate word_sz words in dest, either directly into the regions or by
	// allocating a new PLAB. Returns the address of the allocated memory, NULL if
	// not successful.
	HeapWord* allocate_direct_or_new_plab(InCSetState dest,
	size_t word_sz,
	AllocationContext_t context);

	// Allocate word_sz words in the PLAB of dest. Returns the address of the
	// allocated memory, NULL if not successful.
	HeapWord* plab_allocate(InCSetState dest,
	size_t word_sz,
	AllocationContext_t context) {
	G1ParGCAllocBuffer* buffer = alloc_buffer(dest, context);
	if (_survivor_alignment_bytes == 0) {
	return buffer->allocate(word_sz);
	} else {
	return buffer->allocate_aligned(word_sz, _survivor_alignment_bytes);
	}
	}

	HeapWord* allocate(InCSetState dest, size_t word_sz,
	AllocationContext_t context) {
	HeapWord* const obj = plab_allocate(dest, word_sz, context);
	if (obj != NULL) {
	return obj;
	}
	return allocate_direct_or_new_plab(dest, word_sz, context);
	}

	void undo_allocation(InCSetState dest, HeapWord* obj, size_t word_sz, AllocationContext_t context) {
	if (alloc_buffer(dest, context)->contains(obj)) {
	assert(alloc_buffer(dest, context)->contains(obj + word_sz - 1),
	"should contain whole object");
	alloc_buffer(dest, 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[InCSetState::Num];

	public:
	G1DefaultParGCAllocator(G1CollectedHeap* g1h);

	virtual G1ParGCAllocBuffer* alloc_buffer(InCSetState dest, AllocationContext_t context) {
	assert(dest.is_valid(),
	err_msg("Allocation buffer index out-of-bounds: " CSETSTATE_FORMAT, dest.value()));
	assert(_alloc_buffers[dest.value()] != NULL,
	err_msg("Allocation buffer is NULL: " CSETSTATE_FORMAT, dest.value()));
	return _alloc_buffers[dest.value()];
	}

	virtual void retire_alloc_buffers() ;
	};

	#endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1ALLOCATOR_HPP