Mercurial > hg > graal-compiler
annotate src/share/vm/memory/heap.cpp @ 14717:aa1a43bfdf4e
make HotSpotResolvedJavaMethod leaner
author | twisti |
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date | Fri, 21 Mar 2014 14:26:58 -0700 |
parents | b51e29501f30 |
children | 92aa6797d639 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "memory/heap.hpp" | |
27 #include "oops/oop.inline.hpp" | |
28 #include "runtime/os.hpp" | |
6197 | 29 #include "services/memTracker.hpp" |
0 | 30 |
31 size_t CodeHeap::header_size() { | |
32 return sizeof(HeapBlock); | |
33 } | |
34 | |
35 | |
36 // Implementation of Heap | |
37 | |
38 CodeHeap::CodeHeap() { | |
39 _number_of_committed_segments = 0; | |
40 _number_of_reserved_segments = 0; | |
41 _segment_size = 0; | |
42 _log2_segment_size = 0; | |
43 _next_segment = 0; | |
44 _freelist = NULL; | |
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45 _freelist_segments = 0; |
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46 _freelist_length = 0; |
0 | 47 } |
48 | |
49 | |
50 void CodeHeap::mark_segmap_as_free(size_t beg, size_t end) { | |
51 assert(0 <= beg && beg < _number_of_committed_segments, "interval begin out of bounds"); | |
52 assert(beg < end && end <= _number_of_committed_segments, "interval end out of bounds"); | |
53 // setup _segmap pointers for faster indexing | |
54 address p = (address)_segmap.low() + beg; | |
55 address q = (address)_segmap.low() + end; | |
56 // initialize interval | |
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57 while (p < q) *p++ = free_sentinel; |
0 | 58 } |
59 | |
60 | |
61 void CodeHeap::mark_segmap_as_used(size_t beg, size_t end) { | |
62 assert(0 <= beg && beg < _number_of_committed_segments, "interval begin out of bounds"); | |
63 assert(beg < end && end <= _number_of_committed_segments, "interval end out of bounds"); | |
64 // setup _segmap pointers for faster indexing | |
65 address p = (address)_segmap.low() + beg; | |
66 address q = (address)_segmap.low() + end; | |
67 // initialize interval | |
68 int i = 0; | |
69 while (p < q) { | |
70 *p++ = i++; | |
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71 if (i == free_sentinel) i = 1; |
0 | 72 } |
73 } | |
74 | |
75 | |
76 static size_t align_to_page_size(size_t size) { | |
77 const size_t alignment = (size_t)os::vm_page_size(); | |
78 assert(is_power_of_2(alignment), "no kidding ???"); | |
79 return (size + alignment - 1) & ~(alignment - 1); | |
80 } | |
81 | |
82 | |
83 void CodeHeap::on_code_mapping(char* base, size_t size) { | |
84 #ifdef LINUX | |
85 extern void linux_wrap_code(char* base, size_t size); | |
86 linux_wrap_code(base, size); | |
87 #endif | |
88 } | |
89 | |
90 | |
91 bool CodeHeap::reserve(size_t reserved_size, size_t committed_size, | |
92 size_t segment_size) { | |
93 assert(reserved_size >= committed_size, "reserved < committed"); | |
94 assert(segment_size >= sizeof(FreeBlock), "segment size is too small"); | |
95 assert(is_power_of_2(segment_size), "segment_size must be a power of 2"); | |
96 | |
97 _segment_size = segment_size; | |
98 _log2_segment_size = exact_log2(segment_size); | |
99 | |
100 // Reserve and initialize space for _memory. | |
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101 const size_t page_size = os::can_execute_large_page_memory() ? |
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102 os::page_size_for_region(committed_size, reserved_size, 8) : |
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103 os::vm_page_size(); |
0 | 104 const size_t granularity = os::vm_allocation_granularity(); |
105 const size_t r_align = MAX2(page_size, granularity); | |
106 const size_t r_size = align_size_up(reserved_size, r_align); | |
107 const size_t c_size = align_size_up(committed_size, page_size); | |
108 | |
109 const size_t rs_align = page_size == (size_t) os::vm_page_size() ? 0 : | |
110 MAX2(page_size, granularity); | |
656 | 111 ReservedCodeSpace rs(r_size, rs_align, rs_align > 0); |
0 | 112 os::trace_page_sizes("code heap", committed_size, reserved_size, page_size, |
113 rs.base(), rs.size()); | |
114 if (!_memory.initialize(rs, c_size)) { | |
115 return false; | |
116 } | |
117 | |
118 on_code_mapping(_memory.low(), _memory.committed_size()); | |
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119 _number_of_committed_segments = size_to_segments(_memory.committed_size()); |
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120 _number_of_reserved_segments = size_to_segments(_memory.reserved_size()); |
0 | 121 assert(_number_of_reserved_segments >= _number_of_committed_segments, "just checking"); |
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122 const size_t reserved_segments_alignment = MAX2((size_t)os::vm_page_size(), granularity); |
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123 const size_t reserved_segments_size = align_size_up(_number_of_reserved_segments, reserved_segments_alignment); |
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124 const size_t committed_segments_size = align_to_page_size(_number_of_committed_segments); |
0 | 125 |
126 // reserve space for _segmap | |
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127 if (!_segmap.initialize(reserved_segments_size, committed_segments_size)) { |
0 | 128 return false; |
129 } | |
6197 | 130 |
131 MemTracker::record_virtual_memory_type((address)_segmap.low_boundary(), mtCode); | |
132 | |
0 | 133 assert(_segmap.committed_size() >= (size_t) _number_of_committed_segments, "could not commit enough space for segment map"); |
134 assert(_segmap.reserved_size() >= (size_t) _number_of_reserved_segments , "could not reserve enough space for segment map"); | |
135 assert(_segmap.reserved_size() >= _segmap.committed_size() , "just checking"); | |
136 | |
137 // initialize remaining instance variables | |
138 clear(); | |
139 return true; | |
140 } | |
141 | |
142 | |
143 bool CodeHeap::expand_by(size_t size) { | |
144 // expand _memory space | |
145 size_t dm = align_to_page_size(_memory.committed_size() + size) - _memory.committed_size(); | |
146 if (dm > 0) { | |
147 char* base = _memory.low() + _memory.committed_size(); | |
148 if (!_memory.expand_by(dm)) return false; | |
149 on_code_mapping(base, dm); | |
150 size_t i = _number_of_committed_segments; | |
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151 _number_of_committed_segments = size_to_segments(_memory.committed_size()); |
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152 assert(_number_of_reserved_segments == size_to_segments(_memory.reserved_size()), "number of reserved segments should not change"); |
0 | 153 assert(_number_of_reserved_segments >= _number_of_committed_segments, "just checking"); |
154 // expand _segmap space | |
155 size_t ds = align_to_page_size(_number_of_committed_segments) - _segmap.committed_size(); | |
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156 if ((ds > 0) && !_segmap.expand_by(ds)) { |
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157 return false; |
0 | 158 } |
159 assert(_segmap.committed_size() >= (size_t) _number_of_committed_segments, "just checking"); | |
160 // initialize additional segmap entries | |
161 mark_segmap_as_free(i, _number_of_committed_segments); | |
162 } | |
163 return true; | |
164 } | |
165 | |
166 void CodeHeap::clear() { | |
167 _next_segment = 0; | |
168 mark_segmap_as_free(0, _number_of_committed_segments); | |
169 } | |
170 | |
171 | |
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172 void* CodeHeap::allocate(size_t instance_size, bool is_critical) { |
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173 size_t number_of_segments = size_to_segments(instance_size + header_size()); |
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174 assert(segments_to_size(number_of_segments) >= sizeof(FreeBlock), "not enough room for FreeList"); |
0 | 175 |
14309 | 176 // First check if we can satisfy request from freelist |
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177 NOT_PRODUCT(verify()); |
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178 HeapBlock* block = search_freelist(number_of_segments, is_critical); |
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179 NOT_PRODUCT(verify()); |
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180 |
0 | 181 if (block != NULL) { |
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182 assert(block->length() >= number_of_segments && block->length() < number_of_segments + CodeCacheMinBlockLength, "sanity check"); |
0 | 183 assert(!block->free(), "must be marked free"); |
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184 DEBUG_ONLY(memset((void*)block->allocated_space(), badCodeHeapNewVal, instance_size)); |
0 | 185 return block->allocated_space(); |
186 } | |
187 | |
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188 // Ensure minimum size for allocation to the heap. |
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189 number_of_segments = MAX2((int)CodeCacheMinBlockLength, (int)number_of_segments); |
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190 |
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191 if (!is_critical) { |
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192 // Make sure the allocation fits in the unallocated heap without using |
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193 // the CodeCacheMimimumFreeSpace that is reserved for critical allocations. |
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194 if (segments_to_size(number_of_segments) > (heap_unallocated_capacity() - CodeCacheMinimumFreeSpace)) { |
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195 // Fail allocation |
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196 return NULL; |
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197 } |
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198 } |
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199 |
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200 if (_next_segment + number_of_segments <= _number_of_committed_segments) { |
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201 mark_segmap_as_used(_next_segment, _next_segment + number_of_segments); |
0 | 202 HeapBlock* b = block_at(_next_segment); |
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203 b->initialize(number_of_segments); |
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204 _next_segment += number_of_segments; |
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205 DEBUG_ONLY(memset((void *)b->allocated_space(), badCodeHeapNewVal, instance_size)); |
0 | 206 return b->allocated_space(); |
207 } else { | |
208 return NULL; | |
209 } | |
210 } | |
211 | |
212 | |
213 void CodeHeap::deallocate(void* p) { | |
214 assert(p == find_start(p), "illegal deallocation"); | |
215 // Find start of HeapBlock | |
216 HeapBlock* b = (((HeapBlock *)p) - 1); | |
217 assert(b->allocated_space() == p, "sanity check"); | |
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218 DEBUG_ONLY(memset((void *)b->allocated_space(), badCodeHeapFreeVal, |
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219 segments_to_size(b->length()) - sizeof(HeapBlock))); |
0 | 220 add_to_freelist(b); |
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221 NOT_PRODUCT(verify()); |
0 | 222 } |
223 | |
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224 /** |
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225 * Uses segment map to find the the start (header) of a nmethod. This works as follows: |
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226 * The memory of the code cache is divided into 'segments'. The size of a segment is |
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227 * determined by -XX:CodeCacheSegmentSize=XX. Allocation in the code cache can only |
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228 * happen at segment boundaries. A pointer in the code cache can be mapped to a segment |
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229 * by calling segment_for(addr). Each time memory is requested from the code cache, |
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230 * the segmap is updated accordingly. See the following example, which illustrates the |
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231 * state of code cache and the segment map: (seg -> segment, nm ->nmethod) |
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232 * |
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233 * code cache segmap |
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234 * ----------- --------- |
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235 * seg 1 | nm 1 | -> | 0 | |
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236 * seg 2 | nm 1 | -> | 1 | |
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237 * ... | nm 1 | -> | .. | |
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238 * seg m | nm 2 | -> | 0 | |
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239 * seg m+1 | nm 2 | -> | 1 | |
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240 * ... | nm 2 | -> | 2 | |
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241 * ... | nm 2 | -> | .. | |
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242 * ... | nm 2 | -> | 0xFE | |
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243 * seg m+n | nm 2 | -> | 1 | |
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244 * ... | nm 2 | -> | | |
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245 * |
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246 * A value of '0' in the segmap indicates that this segment contains the beginning of |
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247 * an nmethod. Let's walk through a simple example: If we want to find the start of |
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248 * an nmethod that falls into seg 2, we read the value of the segmap[2]. The value |
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249 * is an offset that points to the segment that contains the start of the nmethod. |
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250 * Another example: If we want to get the start of nm 2, and we happen to get a pointer |
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251 * that points to seg m+n, we first read seg[n+m], which returns '1'. So we have to |
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252 * do one more read of the segmap[m+n-1] to finally get the segment header. |
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253 */ |
0 | 254 void* CodeHeap::find_start(void* p) const { |
255 if (!contains(p)) { | |
256 return NULL; | |
257 } | |
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258 size_t seg_idx = segment_for(p); |
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259 address seg_map = (address)_segmap.low(); |
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260 if (is_segment_unused(seg_map[seg_idx])) { |
0 | 261 return NULL; |
262 } | |
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263 while (seg_map[seg_idx] > 0) { |
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264 seg_idx -= (int)seg_map[seg_idx]; |
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265 } |
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266 |
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267 HeapBlock* h = block_at(seg_idx); |
0 | 268 if (h->free()) { |
269 return NULL; | |
270 } | |
271 return h->allocated_space(); | |
272 } | |
273 | |
274 | |
275 size_t CodeHeap::alignment_unit() const { | |
276 // this will be a power of two | |
277 return _segment_size; | |
278 } | |
279 | |
280 | |
281 size_t CodeHeap::alignment_offset() const { | |
282 // The lowest address in any allocated block will be | |
283 // equal to alignment_offset (mod alignment_unit). | |
284 return sizeof(HeapBlock) & (_segment_size - 1); | |
285 } | |
286 | |
287 // Finds the next free heapblock. If the current one is free, that it returned | |
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288 void* CodeHeap::next_free(HeapBlock* b) const { |
0 | 289 // Since free blocks are merged, there is max. on free block |
290 // between two used ones | |
291 if (b != NULL && b->free()) b = next_block(b); | |
292 assert(b == NULL || !b->free(), "must be in use or at end of heap"); | |
293 return (b == NULL) ? NULL : b->allocated_space(); | |
294 } | |
295 | |
296 // Returns the first used HeapBlock | |
297 HeapBlock* CodeHeap::first_block() const { | |
298 if (_next_segment > 0) | |
299 return block_at(0); | |
300 return NULL; | |
301 } | |
302 | |
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303 HeapBlock* CodeHeap::block_start(void* q) const { |
0 | 304 HeapBlock* b = (HeapBlock*)find_start(q); |
305 if (b == NULL) return NULL; | |
306 return b - 1; | |
307 } | |
308 | |
309 // Returns the next Heap block an offset into one | |
310 HeapBlock* CodeHeap::next_block(HeapBlock *b) const { | |
311 if (b == NULL) return NULL; | |
312 size_t i = segment_for(b) + b->length(); | |
313 if (i < _next_segment) | |
314 return block_at(i); | |
315 return NULL; | |
316 } | |
317 | |
318 | |
319 // Returns current capacity | |
320 size_t CodeHeap::capacity() const { | |
321 return _memory.committed_size(); | |
322 } | |
323 | |
324 size_t CodeHeap::max_capacity() const { | |
325 return _memory.reserved_size(); | |
326 } | |
327 | |
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328 int CodeHeap::allocated_segments() const { |
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329 return (int)_next_segment; |
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330 } |
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331 |
0 | 332 size_t CodeHeap::allocated_capacity() const { |
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333 // size of used heap - size on freelist |
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334 return segments_to_size(_next_segment - _freelist_segments); |
0 | 335 } |
336 | |
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337 // Returns size of the unallocated heap block |
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338 size_t CodeHeap::heap_unallocated_capacity() const { |
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339 // Total number of segments - number currently used |
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340 return segments_to_size(_number_of_reserved_segments - _next_segment); |
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341 } |
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342 |
0 | 343 // Free list management |
344 | |
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345 FreeBlock* CodeHeap::following_block(FreeBlock *b) { |
0 | 346 return (FreeBlock*)(((address)b) + _segment_size * b->length()); |
347 } | |
348 | |
349 // Inserts block b after a | |
350 void CodeHeap::insert_after(FreeBlock* a, FreeBlock* b) { | |
351 assert(a != NULL && b != NULL, "must be real pointers"); | |
352 | |
353 // Link b into the list after a | |
354 b->set_link(a->link()); | |
355 a->set_link(b); | |
356 | |
357 // See if we can merge blocks | |
358 merge_right(b); // Try to make b bigger | |
359 merge_right(a); // Try to make a include b | |
360 } | |
361 | |
362 // Try to merge this block with the following block | |
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363 bool CodeHeap::merge_right(FreeBlock* a) { |
0 | 364 assert(a->free(), "must be a free block"); |
365 if (following_block(a) == a->link()) { | |
366 assert(a->link() != NULL && a->link()->free(), "must be free too"); | |
367 // Update block a to include the following block | |
368 a->set_length(a->length() + a->link()->length()); | |
369 a->set_link(a->link()->link()); | |
370 // Update find_start map | |
371 size_t beg = segment_for(a); | |
372 mark_segmap_as_used(beg, beg + a->length()); | |
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373 _freelist_length--; |
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374 return true; |
0 | 375 } |
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376 return false; |
0 | 377 } |
378 | |
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379 |
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380 void CodeHeap::add_to_freelist(HeapBlock* a) { |
0 | 381 FreeBlock* b = (FreeBlock*)a; |
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382 _freelist_length++; |
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383 |
0 | 384 assert(b != _freelist, "cannot be removed twice"); |
385 | |
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386 |
0 | 387 // Mark as free and update free space count |
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388 _freelist_segments += b->length(); |
0 | 389 b->set_free(); |
390 | |
391 // First element in list? | |
392 if (_freelist == NULL) { | |
393 _freelist = b; | |
394 b->set_link(NULL); | |
395 return; | |
396 } | |
397 | |
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398 // Since the freelist is ordered (smaller addresses -> larger addresses) and the |
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399 // element we want to insert into the freelist has a smaller address than the first |
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400 // element, we can simply add 'b' as the first element and we are done. |
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401 if (b < _freelist) { |
0 | 402 // Insert first in list |
403 b->set_link(_freelist); | |
404 _freelist = b; | |
405 merge_right(_freelist); | |
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406 return; |
0 | 407 } |
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408 |
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409 // Scan for right place to put into list. List |
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410 // is sorted by increasing addresses |
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411 FreeBlock* prev = _freelist; |
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412 FreeBlock* cur = _freelist->link(); |
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413 while(cur != NULL && cur < b) { |
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414 assert(prev < cur, "Freelist must be ordered"); |
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415 prev = cur; |
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416 cur = cur->link(); |
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417 } |
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418 assert((prev < b) && (cur == NULL || b < cur), "free-list must be ordered"); |
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419 insert_after(prev, b); |
0 | 420 } |
421 | |
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422 /** |
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423 * Search freelist for an entry on the list with the best fit. |
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424 * @return NULL, if no one was found |
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425 */ |
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426 FreeBlock* CodeHeap::search_freelist(size_t length, bool is_critical) { |
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427 FreeBlock* found_block = NULL; |
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428 FreeBlock* found_prev = NULL; |
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429 size_t found_length = 0; |
0 | 430 |
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431 FreeBlock* prev = NULL; |
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432 FreeBlock* cur = _freelist; |
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433 const size_t critical_boundary = (size_t)high_boundary() - CodeCacheMinimumFreeSpace; |
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434 |
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435 // Search for first block that fits |
0 | 436 while(cur != NULL) { |
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437 if (cur->length() >= length) { |
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438 // Non critical allocations are not allowed to use the last part of the code heap. |
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439 // Make sure the end of the allocation doesn't cross into the last part of the code heap. |
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440 if (!is_critical && (((size_t)cur + length) > critical_boundary)) { |
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441 // The freelist is sorted by address - if one fails, all consecutive will also fail. |
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442 break; |
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443 } |
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444 // Remember block, its previous element, and its length |
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445 found_block = cur; |
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446 found_prev = prev; |
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447 found_length = found_block->length(); |
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448 |
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449 break; |
0 | 450 } |
451 // Next element in list | |
452 prev = cur; | |
453 cur = cur->link(); | |
454 } | |
455 | |
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456 if (found_block == NULL) { |
0 | 457 // None found |
458 return NULL; | |
459 } | |
460 | |
461 // Exact (or at least good enough) fit. Remove from list. | |
462 // Don't leave anything on the freelist smaller than CodeCacheMinBlockLength. | |
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463 if (found_length - length < CodeCacheMinBlockLength) { |
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464 _freelist_length--; |
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465 length = found_length; |
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466 if (found_prev == NULL) { |
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467 assert(_freelist == found_block, "sanity check"); |
0 | 468 _freelist = _freelist->link(); |
469 } else { | |
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470 assert((found_prev->link() == found_block), "sanity check"); |
0 | 471 // Unmap element |
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472 found_prev->set_link(found_block->link()); |
0 | 473 } |
474 } else { | |
475 // Truncate block and return a pointer to the following block | |
476 // Set used bit and length on new block | |
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477 found_block->set_length(found_length - length); |
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478 found_block = following_block(found_block); |
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479 |
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480 size_t beg = segment_for(found_block); |
0 | 481 mark_segmap_as_used(beg, beg + length); |
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482 found_block->set_length(length); |
0 | 483 } |
484 | |
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485 found_block->set_used(); |
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486 _freelist_segments -= length; |
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487 return found_block; |
0 | 488 } |
489 | |
490 //---------------------------------------------------------------------------- | |
491 // Non-product code | |
492 | |
493 #ifndef PRODUCT | |
494 | |
495 void CodeHeap::print() { | |
496 tty->print_cr("The Heap"); | |
497 } | |
498 | |
499 void CodeHeap::verify() { | |
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500 if (VerifyCodeCache) { |
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501 size_t len = 0; |
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502 int count = 0; |
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503 for(FreeBlock* b = _freelist; b != NULL; b = b->link()) { |
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504 len += b->length(); |
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505 count++; |
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506 // Check if we have merged all free blocks |
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507 assert(merge_right(b) == false, "Missed merging opportunity"); |
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508 } |
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509 // Verify that freelist contains the right amount of free space |
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510 assert(len == _freelist_segments, "wrong freelist"); |
0 | 511 |
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512 for(HeapBlock* h = first_block(); h != NULL; h = next_block(h)) { |
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513 if (h->free()) count--; |
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514 } |
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515 // Verify that the freelist contains the same number of blocks |
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516 // than free blocks found on the full list. |
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517 assert(count == 0, "missing free blocks"); |
0 | 518 |
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519 // Verify that the number of free blocks is not out of hand. |
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520 static int free_block_threshold = 10000; |
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521 if (count > free_block_threshold) { |
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522 warning("CodeHeap: # of free blocks > %d", free_block_threshold); |
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523 // Double the warning limit |
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524 free_block_threshold *= 2; |
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525 } |
0 | 526 } |
527 } | |
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528 |
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529 #endif |