1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/gc_implementation/g1/g1Allocator.hpp Fri Sep 05 09:49:19 2014 +0200
1.3 @@ -0,0 +1,236 @@
1.4 +/*
1.5 + * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1ALLOCATOR_HPP
1.29 +#define SHARE_VM_GC_IMPLEMENTATION_G1_G1ALLOCATOR_HPP
1.30 +
1.31 +#include "gc_implementation/g1/g1AllocationContext.hpp"
1.32 +#include "gc_implementation/g1/g1AllocRegion.hpp"
1.33 +#include "gc_implementation/shared/parGCAllocBuffer.hpp"
1.34 +
1.35 +enum GCAllocPurpose {
1.36 + GCAllocForTenured,
1.37 + GCAllocForSurvived,
1.38 + GCAllocPurposeCount
1.39 +};
1.40 +
1.41 +// Base class for G1 allocators.
1.42 +class G1Allocator : public CHeapObj<mtGC> {
1.43 + friend class VMStructs;
1.44 +protected:
1.45 + G1CollectedHeap* _g1h;
1.46 +
1.47 + // Outside of GC pauses, the number of bytes used in all regions other
1.48 + // than the current allocation region.
1.49 + size_t _summary_bytes_used;
1.50 +
1.51 +public:
1.52 + G1Allocator(G1CollectedHeap* heap) :
1.53 + _g1h(heap), _summary_bytes_used(0) { }
1.54 +
1.55 + static G1Allocator* create_allocator(G1CollectedHeap* g1h);
1.56 +
1.57 + virtual void init_mutator_alloc_region() = 0;
1.58 + virtual void release_mutator_alloc_region() = 0;
1.59 +
1.60 + virtual void init_gc_alloc_regions(EvacuationInfo& evacuation_info) = 0;
1.61 + virtual void release_gc_alloc_regions(uint no_of_gc_workers, EvacuationInfo& evacuation_info) = 0;
1.62 + virtual void abandon_gc_alloc_regions() = 0;
1.63 +
1.64 + virtual MutatorAllocRegion* mutator_alloc_region(AllocationContext_t context) = 0;
1.65 + virtual SurvivorGCAllocRegion* survivor_gc_alloc_region(AllocationContext_t context) = 0;
1.66 + virtual OldGCAllocRegion* old_gc_alloc_region(AllocationContext_t context) = 0;
1.67 + virtual size_t used() = 0;
1.68 + virtual bool is_retained_old_region(HeapRegion* hr) = 0;
1.69 +
1.70 + void reuse_retained_old_region(EvacuationInfo& evacuation_info,
1.71 + OldGCAllocRegion* old,
1.72 + HeapRegion** retained);
1.73 +
1.74 + size_t used_unlocked() const {
1.75 + return _summary_bytes_used;
1.76 + }
1.77 +
1.78 + void increase_used(size_t bytes) {
1.79 + _summary_bytes_used += bytes;
1.80 + }
1.81 +
1.82 + void decrease_used(size_t bytes) {
1.83 + assert(_summary_bytes_used >= bytes,
1.84 + err_msg("invariant: _summary_bytes_used: "SIZE_FORMAT" should be >= bytes: "SIZE_FORMAT,
1.85 + _summary_bytes_used, bytes));
1.86 + _summary_bytes_used -= bytes;
1.87 + }
1.88 +
1.89 + void set_used(size_t bytes) {
1.90 + _summary_bytes_used = bytes;
1.91 + }
1.92 +};
1.93 +
1.94 +// The default allocator for G1.
1.95 +class G1DefaultAllocator : public G1Allocator {
1.96 +protected:
1.97 + // Alloc region used to satisfy mutator allocation requests.
1.98 + MutatorAllocRegion _mutator_alloc_region;
1.99 +
1.100 + // Alloc region used to satisfy allocation requests by the GC for
1.101 + // survivor objects.
1.102 + SurvivorGCAllocRegion _survivor_gc_alloc_region;
1.103 +
1.104 + // Alloc region used to satisfy allocation requests by the GC for
1.105 + // old objects.
1.106 + OldGCAllocRegion _old_gc_alloc_region;
1.107 +
1.108 + HeapRegion* _retained_old_gc_alloc_region;
1.109 +public:
1.110 + G1DefaultAllocator(G1CollectedHeap* heap) : G1Allocator(heap), _retained_old_gc_alloc_region(NULL) { }
1.111 +
1.112 + virtual void init_mutator_alloc_region();
1.113 + virtual void release_mutator_alloc_region();
1.114 +
1.115 + virtual void init_gc_alloc_regions(EvacuationInfo& evacuation_info);
1.116 + virtual void release_gc_alloc_regions(uint no_of_gc_workers, EvacuationInfo& evacuation_info);
1.117 + virtual void abandon_gc_alloc_regions();
1.118 +
1.119 + virtual bool is_retained_old_region(HeapRegion* hr) {
1.120 + return _retained_old_gc_alloc_region == hr;
1.121 + }
1.122 +
1.123 + virtual MutatorAllocRegion* mutator_alloc_region(AllocationContext_t context) {
1.124 + return &_mutator_alloc_region;
1.125 + }
1.126 +
1.127 + virtual SurvivorGCAllocRegion* survivor_gc_alloc_region(AllocationContext_t context) {
1.128 + return &_survivor_gc_alloc_region;
1.129 + }
1.130 +
1.131 + virtual OldGCAllocRegion* old_gc_alloc_region(AllocationContext_t context) {
1.132 + return &_old_gc_alloc_region;
1.133 + }
1.134 +
1.135 + virtual size_t used() {
1.136 + assert(Heap_lock->owner() != NULL,
1.137 + "Should be owned on this thread's behalf.");
1.138 + size_t result = _summary_bytes_used;
1.139 +
1.140 + // Read only once in case it is set to NULL concurrently
1.141 + HeapRegion* hr = mutator_alloc_region(AllocationContext::current())->get();
1.142 + if (hr != NULL) {
1.143 + result += hr->used();
1.144 + }
1.145 + return result;
1.146 + }
1.147 +};
1.148 +
1.149 +class G1ParGCAllocBuffer: public ParGCAllocBuffer {
1.150 +private:
1.151 + bool _retired;
1.152 +
1.153 +public:
1.154 + G1ParGCAllocBuffer(size_t gclab_word_size);
1.155 + virtual ~G1ParGCAllocBuffer() {
1.156 + guarantee(_retired, "Allocation buffer has not been retired");
1.157 + }
1.158 +
1.159 + virtual void set_buf(HeapWord* buf) {
1.160 + ParGCAllocBuffer::set_buf(buf);
1.161 + _retired = false;
1.162 + }
1.163 +
1.164 + virtual void retire(bool end_of_gc, bool retain) {
1.165 + if (_retired) {
1.166 + return;
1.167 + }
1.168 + ParGCAllocBuffer::retire(end_of_gc, retain);
1.169 + _retired = true;
1.170 + }
1.171 +};
1.172 +
1.173 +class G1ParGCAllocator : public CHeapObj<mtGC> {
1.174 + friend class G1ParScanThreadState;
1.175 +protected:
1.176 + G1CollectedHeap* _g1h;
1.177 +
1.178 + size_t _alloc_buffer_waste;
1.179 + size_t _undo_waste;
1.180 +
1.181 + void add_to_alloc_buffer_waste(size_t waste) { _alloc_buffer_waste += waste; }
1.182 + void add_to_undo_waste(size_t waste) { _undo_waste += waste; }
1.183 +
1.184 + HeapWord* allocate_slow(GCAllocPurpose purpose, size_t word_sz, AllocationContext_t context);
1.185 +
1.186 + virtual void retire_alloc_buffers() = 0;
1.187 + virtual G1ParGCAllocBuffer* alloc_buffer(GCAllocPurpose purpose, AllocationContext_t context) = 0;
1.188 +
1.189 +public:
1.190 + G1ParGCAllocator(G1CollectedHeap* g1h) :
1.191 + _g1h(g1h), _alloc_buffer_waste(0), _undo_waste(0) {
1.192 + }
1.193 +
1.194 + static G1ParGCAllocator* create_allocator(G1CollectedHeap* g1h);
1.195 +
1.196 + size_t alloc_buffer_waste() { return _alloc_buffer_waste; }
1.197 + size_t undo_waste() {return _undo_waste; }
1.198 +
1.199 + HeapWord* allocate(GCAllocPurpose purpose, size_t word_sz, AllocationContext_t context) {
1.200 + HeapWord* obj = NULL;
1.201 + if (purpose == GCAllocForSurvived) {
1.202 + obj = alloc_buffer(purpose, context)->allocate_aligned(word_sz, SurvivorAlignmentInBytes);
1.203 + } else {
1.204 + obj = alloc_buffer(purpose, context)->allocate(word_sz);
1.205 + }
1.206 + if (obj != NULL) {
1.207 + return obj;
1.208 + }
1.209 + return allocate_slow(purpose, word_sz, context);
1.210 + }
1.211 +
1.212 + void undo_allocation(GCAllocPurpose purpose, HeapWord* obj, size_t word_sz, AllocationContext_t context) {
1.213 + if (alloc_buffer(purpose, context)->contains(obj)) {
1.214 + assert(alloc_buffer(purpose, context)->contains(obj + word_sz - 1),
1.215 + "should contain whole object");
1.216 + alloc_buffer(purpose, context)->undo_allocation(obj, word_sz);
1.217 + } else {
1.218 + CollectedHeap::fill_with_object(obj, word_sz);
1.219 + add_to_undo_waste(word_sz);
1.220 + }
1.221 + }
1.222 +};
1.223 +
1.224 +class G1DefaultParGCAllocator : public G1ParGCAllocator {
1.225 + G1ParGCAllocBuffer _surviving_alloc_buffer;
1.226 + G1ParGCAllocBuffer _tenured_alloc_buffer;
1.227 + G1ParGCAllocBuffer* _alloc_buffers[GCAllocPurposeCount];
1.228 +
1.229 +public:
1.230 + G1DefaultParGCAllocator(G1CollectedHeap* g1h);
1.231 +
1.232 + virtual G1ParGCAllocBuffer* alloc_buffer(GCAllocPurpose purpose, AllocationContext_t context) {
1.233 + return _alloc_buffers[purpose];
1.234 + }
1.235 +
1.236 + virtual void retire_alloc_buffers() ;
1.237 +};
1.238 +
1.239 +#endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1ALLOCATOR_HPP
