1 /* 2 * Copyright (c) 2006, 2016, 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 */ 24 25 #ifndef SHARE_VM_GC_PARALLEL_MUTABLENUMASPACE_HPP 26 #define SHARE_VM_GC_PARALLEL_MUTABLENUMASPACE_HPP 27 28 #include "gc/parallel/mutableSpace.hpp" 29 #include "gc/shared/gcUtil.hpp" 30 #include "utilities/macros.hpp" 31 32 /* 33 * The NUMA-aware allocator (MutableNUMASpace) is basically a modification 34 * of MutableSpace which preserves interfaces but implements different 35 * functionality. The space is split into chunks for each locality group 36 * (resizing for adaptive size policy is also supported). For each thread 37 * allocations are performed in the chunk corresponding to the home locality 38 * group of the thread. Whenever any chunk fills-in the young generation 39 * collection occurs. 40 * The chunks can be also be adaptively resized. The idea behind the adaptive 41 * sizing is to reduce the loss of the space in the eden due to fragmentation. 42 * The main cause of fragmentation is uneven allocation rates of threads. 43 * The allocation rate difference between locality groups may be caused either by 44 * application specifics or by uneven LWP distribution by the OS. Besides, 45 * application can have less threads then the number of locality groups. 46 * In order to resize the chunk we measure the allocation rate of the 47 * application between collections. After that we reshape the chunks to reflect 48 * the allocation rate pattern. The AdaptiveWeightedAverage exponentially 49 * decaying average is used to smooth the measurements. The NUMASpaceResizeRate 50 * parameter is used to control the adaptation speed by restricting the number of 51 * bytes that can be moved during the adaptation phase. 52 * Chunks may contain pages from a wrong locality group. The page-scanner has 53 * been introduced to address the problem. Remote pages typically appear due to 54 * the memory shortage in the target locality group. Besides Solaris would 55 * allocate a large page from the remote locality group even if there are small 56 * local pages available. The page-scanner scans the pages right after the 57 * collection and frees remote pages in hope that subsequent reallocation would 58 * be more successful. This approach proved to be useful on systems with high 59 * load where multiple processes are competing for the memory. 60 */ 61 62 class MutableNUMASpace : public MutableSpace { 63 friend class VMStructs; 64 65 class LGRPSpace : public CHeapObj<mtGC> { 66 int _lgrp_id; 67 MutableSpace* _space; 68 MemRegion _invalid_region; 69 AdaptiveWeightedAverage *_alloc_rate; 70 bool _allocation_failed; 71 72 struct SpaceStats { 73 size_t _local_space, _remote_space, _unbiased_space, _uncommited_space; 74 size_t _large_pages, _small_pages; 75 SpaceStatsMutableNUMASpace::LGRPSpace::SpaceStats76 SpaceStats() { 77 _local_space = 0; 78 _remote_space = 0; 79 _unbiased_space = 0; 80 _uncommited_space = 0; 81 _large_pages = 0; 82 _small_pages = 0; 83 } 84 }; 85 86 SpaceStats _space_stats; 87 88 char* _last_page_scanned; last_page_scanned()89 char* last_page_scanned() { return _last_page_scanned; } set_last_page_scanned(char * p)90 void set_last_page_scanned(char* p) { _last_page_scanned = p; } 91 public: LGRPSpace(int l,size_t alignment)92 LGRPSpace(int l, size_t alignment) : _lgrp_id(l), _last_page_scanned(NULL), _allocation_failed(false) { 93 _space = new MutableSpace(alignment); 94 _alloc_rate = new AdaptiveWeightedAverage(NUMAChunkResizeWeight); 95 } ~LGRPSpace()96 ~LGRPSpace() { 97 delete _space; 98 delete _alloc_rate; 99 } 100 add_invalid_region(MemRegion r)101 void add_invalid_region(MemRegion r) { 102 if (!_invalid_region.is_empty()) { 103 _invalid_region.set_start(MIN2(_invalid_region.start(), r.start())); 104 _invalid_region.set_end(MAX2(_invalid_region.end(), r.end())); 105 } else { 106 _invalid_region = r; 107 } 108 } 109 equals(void * lgrp_id_value,LGRPSpace * p)110 static bool equals(void* lgrp_id_value, LGRPSpace* p) { 111 return *(int*)lgrp_id_value == p->lgrp_id(); 112 } 113 114 // Report a failed allocation. set_allocation_failed()115 void set_allocation_failed() { _allocation_failed = true; } 116 sample()117 void sample() { 118 // If there was a failed allocation make allocation rate equal 119 // to the size of the whole chunk. This ensures the progress of 120 // the adaptation process. 121 size_t alloc_rate_sample; 122 if (_allocation_failed) { 123 alloc_rate_sample = space()->capacity_in_bytes(); 124 _allocation_failed = false; 125 } else { 126 alloc_rate_sample = space()->used_in_bytes(); 127 } 128 alloc_rate()->sample(alloc_rate_sample); 129 } 130 invalid_region() const131 MemRegion invalid_region() const { return _invalid_region; } set_invalid_region(MemRegion r)132 void set_invalid_region(MemRegion r) { _invalid_region = r; } lgrp_id() const133 int lgrp_id() const { return _lgrp_id; } space() const134 MutableSpace* space() const { return _space; } alloc_rate() const135 AdaptiveWeightedAverage* alloc_rate() const { return _alloc_rate; } clear_alloc_rate()136 void clear_alloc_rate() { _alloc_rate->clear(); } space_stats()137 SpaceStats* space_stats() { return &_space_stats; } clear_space_stats()138 void clear_space_stats() { _space_stats = SpaceStats(); } 139 140 void accumulate_statistics(size_t page_size); 141 void scan_pages(size_t page_size, size_t page_count); 142 }; 143 144 GrowableArray<LGRPSpace*>* _lgrp_spaces; 145 size_t _page_size; 146 unsigned _adaptation_cycles, _samples_count; 147 148 bool _must_use_large_pages; 149 set_page_size(size_t psz)150 void set_page_size(size_t psz) { _page_size = psz; } page_size() const151 size_t page_size() const { return _page_size; } 152 adaptation_cycles()153 unsigned adaptation_cycles() { return _adaptation_cycles; } set_adaptation_cycles(int v)154 void set_adaptation_cycles(int v) { _adaptation_cycles = v; } 155 samples_count()156 unsigned samples_count() { return _samples_count; } increment_samples_count()157 void increment_samples_count() { ++_samples_count; } 158 159 size_t _base_space_size; set_base_space_size(size_t v)160 void set_base_space_size(size_t v) { _base_space_size = v; } base_space_size() const161 size_t base_space_size() const { return _base_space_size; } 162 163 // Check if the NUMA topology has changed. Add and remove spaces if needed. 164 // The update can be forced by setting the force parameter equal to true. 165 bool update_layout(bool force); 166 // Bias region towards the lgrp. 167 void bias_region(MemRegion mr, int lgrp_id); 168 // Free pages in a given region. 169 void free_region(MemRegion mr); 170 // Get current chunk size. 171 size_t current_chunk_size(int i); 172 // Get default chunk size (equally divide the space). 173 size_t default_chunk_size(); 174 // Adapt the chunk size to follow the allocation rate. 175 size_t adaptive_chunk_size(int i, size_t limit); 176 // Scan and free invalid pages. 177 void scan_pages(size_t page_count); 178 // Return the bottom_region and the top_region. Align them to page_size() boundary. 179 // |------------------new_region---------------------------------| 180 // |----bottom_region--|---intersection---|------top_region------| 181 void select_tails(MemRegion new_region, MemRegion intersection, 182 MemRegion* bottom_region, MemRegion *top_region); 183 // Try to merge the invalid region with the bottom or top region by decreasing 184 // the intersection area. Return the invalid_region aligned to the page_size() 185 // boundary if it's inside the intersection. Return non-empty invalid_region 186 // if it lies inside the intersection (also page-aligned). 187 // |------------------new_region---------------------------------| 188 // |----------------|-------invalid---|--------------------------| 189 // |----bottom_region--|---intersection---|------top_region------| 190 void merge_regions(MemRegion new_region, MemRegion* intersection, 191 MemRegion *invalid_region); 192 193 public: lgrp_spaces() const194 GrowableArray<LGRPSpace*>* lgrp_spaces() const { return _lgrp_spaces; } 195 MutableNUMASpace(size_t alignment); 196 virtual ~MutableNUMASpace(); 197 // Space initialization. 198 virtual void initialize(MemRegion mr, bool clear_space, bool mangle_space, bool setup_pages = SetupPages); 199 // Update space layout if necessary. Do all adaptive resizing job. 200 virtual void update(); 201 // Update allocation rate averages. 202 virtual void accumulate_statistics(); 203 204 virtual void clear(bool mangle_space); 205 virtual void mangle_unused_area() PRODUCT_RETURN; 206 virtual void mangle_unused_area_complete() PRODUCT_RETURN; 207 virtual void mangle_region(MemRegion mr) PRODUCT_RETURN; 208 virtual void check_mangled_unused_area(HeapWord* limit) PRODUCT_RETURN; 209 virtual void check_mangled_unused_area_complete() PRODUCT_RETURN; 210 virtual void set_top_for_allocations(HeapWord* v) PRODUCT_RETURN; 211 virtual void set_top_for_allocations() PRODUCT_RETURN; 212 213 virtual void ensure_parsability(); 214 virtual size_t used_in_words() const; 215 virtual size_t free_in_words() const; 216 217 using MutableSpace::capacity_in_words; 218 virtual size_t capacity_in_words(Thread* thr) const; 219 virtual size_t tlab_capacity(Thread* thr) const; 220 virtual size_t tlab_used(Thread* thr) const; 221 virtual size_t unsafe_max_tlab_alloc(Thread* thr) const; 222 223 // Allocation (return NULL if full) 224 virtual HeapWord* allocate(size_t word_size); 225 virtual HeapWord* cas_allocate(size_t word_size); 226 227 // Debugging 228 virtual void print_on(outputStream* st) const; 229 virtual void print_short_on(outputStream* st) const; 230 virtual void verify(); 231 232 virtual void set_top(HeapWord* value); 233 }; 234 235 #endif // SHARE_VM_GC_PARALLEL_MUTABLENUMASPACE_HPP 236