Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/g1ParScanThreadState.cpp @ 22901:c132be0fb74d
8060025: Object copy time regressions after JDK-8031323 and JDK-8057536
Summary: Evaluate and improve object copy time by micro-optimizations and splitting out slow and fast paths aggressively.
Reviewed-by: kbarrett, mgerdin, jmasa
Contributed-by: Tony Printezis <tprintezis@twitter.com>, Thomas Schatzl <thomas.schatzl@oracle.com>
| author | tschatzl |
|---|---|
| date | Fri, 19 Dec 2014 09:21:06 +0100 |
| parents | f2e3f0e1f97d |
| children | 8a2db0a6c499 |
| rev | line source |
|---|---|
| 20223 | 1 /* |
| 2 * Copyright (c) 2014, 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 #include "precompiled.hpp" | |
| 26 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
| 27 #include "gc_implementation/g1/g1OopClosures.inline.hpp" | |
| 28 #include "gc_implementation/g1/g1ParScanThreadState.inline.hpp" | |
| 29 #include "oops/oop.inline.hpp" | |
| 30 #include "oops/oop.pcgc.inline.hpp" | |
| 31 #include "runtime/prefetch.inline.hpp" | |
| 32 | |
| 33 G1ParScanThreadState::G1ParScanThreadState(G1CollectedHeap* g1h, uint queue_num, ReferenceProcessor* rp) | |
| 34 : _g1h(g1h), | |
| 35 _refs(g1h->task_queue(queue_num)), | |
| 36 _dcq(&g1h->dirty_card_queue_set()), | |
| 37 _ct_bs(g1h->g1_barrier_set()), | |
| 38 _g1_rem(g1h->g1_rem_set()), | |
| 39 _hash_seed(17), _queue_num(queue_num), | |
| 40 _term_attempts(0), | |
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41 _tenuring_threshold(g1h->g1_policy()->tenuring_threshold()), |
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42 _age_table(false), _scanner(g1h, rp), |
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43 _strong_roots_time(0), _term_time(0) { |
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44 _scanner.set_par_scan_thread_state(this); |
| 20223 | 45 // we allocate G1YoungSurvRateNumRegions plus one entries, since |
| 46 // we "sacrifice" entry 0 to keep track of surviving bytes for | |
| 47 // non-young regions (where the age is -1) | |
| 48 // We also add a few elements at the beginning and at the end in | |
| 49 // an attempt to eliminate cache contention | |
| 50 uint real_length = 1 + _g1h->g1_policy()->young_cset_region_length(); | |
| 51 uint array_length = PADDING_ELEM_NUM + | |
| 52 real_length + | |
| 53 PADDING_ELEM_NUM; | |
| 54 _surviving_young_words_base = NEW_C_HEAP_ARRAY(size_t, array_length, mtGC); | |
| 55 if (_surviving_young_words_base == NULL) | |
| 56 vm_exit_out_of_memory(array_length * sizeof(size_t), OOM_MALLOC_ERROR, | |
| 57 "Not enough space for young surv histo."); | |
| 58 _surviving_young_words = _surviving_young_words_base + PADDING_ELEM_NUM; | |
| 59 memset(_surviving_young_words, 0, (size_t) real_length * sizeof(size_t)); | |
| 60 | |
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61 _g1_par_allocator = G1ParGCAllocator::create_allocator(_g1h); |
| 20223 | 62 |
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63 _dest[InCSetState::NotInCSet] = InCSetState::NotInCSet; |
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64 // The dest for Young is used when the objects are aged enough to |
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65 // need to be moved to the next space. |
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66 _dest[InCSetState::Young] = InCSetState::Old; |
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67 _dest[InCSetState::Old] = InCSetState::Old; |
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68 |
| 20223 | 69 _start = os::elapsedTime(); |
| 70 } | |
| 71 | |
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72 G1ParScanThreadState::~G1ParScanThreadState() { |
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73 _g1_par_allocator->retire_alloc_buffers(); |
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74 delete _g1_par_allocator; |
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75 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words_base, mtGC); |
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76 } |
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77 |
| 20223 | 78 void |
| 79 G1ParScanThreadState::print_termination_stats_hdr(outputStream* const st) | |
| 80 { | |
| 81 st->print_raw_cr("GC Termination Stats"); | |
| 82 st->print_raw_cr(" elapsed --strong roots-- -------termination-------" | |
| 83 " ------waste (KiB)------"); | |
| 84 st->print_raw_cr("thr ms ms % ms % attempts" | |
| 85 " total alloc undo"); | |
| 86 st->print_raw_cr("--- --------- --------- ------ --------- ------ --------" | |
| 87 " ------- ------- -------"); | |
| 88 } | |
| 89 | |
| 90 void | |
| 91 G1ParScanThreadState::print_termination_stats(int i, | |
| 92 outputStream* const st) const | |
| 93 { | |
| 94 const double elapsed_ms = elapsed_time() * 1000.0; | |
| 95 const double s_roots_ms = strong_roots_time() * 1000.0; | |
| 96 const double term_ms = term_time() * 1000.0; | |
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97 const size_t alloc_buffer_waste = _g1_par_allocator->alloc_buffer_waste(); |
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98 const size_t undo_waste = _g1_par_allocator->undo_waste(); |
| 20223 | 99 st->print_cr("%3d %9.2f %9.2f %6.2f " |
| 100 "%9.2f %6.2f " SIZE_FORMAT_W(8) " " | |
| 101 SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7), | |
| 102 i, elapsed_ms, s_roots_ms, s_roots_ms * 100 / elapsed_ms, | |
| 103 term_ms, term_ms * 100 / elapsed_ms, term_attempts(), | |
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104 (alloc_buffer_waste + undo_waste) * HeapWordSize / K, |
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105 alloc_buffer_waste * HeapWordSize / K, |
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106 undo_waste * HeapWordSize / K); |
| 20223 | 107 } |
| 108 | |
| 109 #ifdef ASSERT | |
| 110 bool G1ParScanThreadState::verify_ref(narrowOop* ref) const { | |
| 111 assert(ref != NULL, "invariant"); | |
| 112 assert(UseCompressedOops, "sanity"); | |
| 113 assert(!has_partial_array_mask(ref), err_msg("ref=" PTR_FORMAT, p2i(ref))); | |
| 114 oop p = oopDesc::load_decode_heap_oop(ref); | |
| 115 assert(_g1h->is_in_g1_reserved(p), | |
| 116 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, p2i(ref), p2i(p))); | |
| 117 return true; | |
| 118 } | |
| 119 | |
| 120 bool G1ParScanThreadState::verify_ref(oop* ref) const { | |
| 121 assert(ref != NULL, "invariant"); | |
| 122 if (has_partial_array_mask(ref)) { | |
| 123 // Must be in the collection set--it's already been copied. | |
| 124 oop p = clear_partial_array_mask(ref); | |
| 125 assert(_g1h->obj_in_cs(p), | |
| 126 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, p2i(ref), p2i(p))); | |
| 127 } else { | |
| 128 oop p = oopDesc::load_decode_heap_oop(ref); | |
| 129 assert(_g1h->is_in_g1_reserved(p), | |
| 130 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, p2i(ref), p2i(p))); | |
| 131 } | |
| 132 return true; | |
| 133 } | |
| 134 | |
| 135 bool G1ParScanThreadState::verify_task(StarTask ref) const { | |
| 136 if (ref.is_narrow()) { | |
| 137 return verify_ref((narrowOop*) ref); | |
| 138 } else { | |
| 139 return verify_ref((oop*) ref); | |
| 140 } | |
| 141 } | |
| 142 #endif // ASSERT | |
| 143 | |
| 144 void G1ParScanThreadState::trim_queue() { | |
| 145 assert(_evac_failure_cl != NULL, "not set"); | |
| 146 | |
| 147 StarTask ref; | |
| 148 do { | |
| 149 // Drain the overflow stack first, so other threads can steal. | |
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150 while (_refs->pop_overflow(ref)) { |
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151 dispatch_reference(ref); |
| 20223 | 152 } |
| 153 | |
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154 while (_refs->pop_local(ref)) { |
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155 dispatch_reference(ref); |
| 20223 | 156 } |
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157 } while (!_refs->is_empty()); |
| 20223 | 158 } |
| 159 | |
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160 HeapWord* G1ParScanThreadState::allocate_in_next_plab(InCSetState const state, |
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161 InCSetState* dest, |
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162 size_t word_sz, |
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163 AllocationContext_t const context) { |
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164 assert(state.is_in_cset_or_humongous(), err_msg("Unexpected state: " CSETSTATE_FORMAT, state.value())); |
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165 assert(dest->is_in_cset_or_humongous(), err_msg("Unexpected dest: " CSETSTATE_FORMAT, dest->value())); |
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166 |
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167 // Right now we only have two types of regions (young / old) so |
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168 // let's keep the logic here simple. We can generalize it when necessary. |
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169 if (dest->is_young()) { |
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170 HeapWord* const obj_ptr = _g1_par_allocator->allocate(InCSetState::Old, |
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171 word_sz, context); |
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172 if (obj_ptr == NULL) { |
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173 return NULL; |
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174 } |
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175 // Make sure that we won't attempt to copy any other objects out |
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176 // of a survivor region (given that apparently we cannot allocate |
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177 // any new ones) to avoid coming into this slow path. |
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178 _tenuring_threshold = 0; |
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179 dest->set_old(); |
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180 return obj_ptr; |
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181 } else { |
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182 assert(dest->is_old(), err_msg("Unexpected dest: " CSETSTATE_FORMAT, dest->value())); |
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183 // no other space to try. |
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184 return NULL; |
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185 } |
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186 } |
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187 |
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188 InCSetState G1ParScanThreadState::next_state(InCSetState const state, markOop const m, uint& age) { |
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189 if (state.is_young()) { |
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190 age = !m->has_displaced_mark_helper() ? m->age() |
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191 : m->displaced_mark_helper()->age(); |
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192 if (age < _tenuring_threshold) { |
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193 return state; |
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194 } |
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195 } |
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196 return dest(state); |
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197 } |
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198 |
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199 oop G1ParScanThreadState::copy_to_survivor_space(InCSetState const state, |
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200 oop const old, |
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201 markOop const old_mark) { |
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202 const size_t word_sz = old->size(); |
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203 HeapRegion* const from_region = _g1h->heap_region_containing_raw(old); |
| 20223 | 204 // +1 to make the -1 indexes valid... |
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205 const int young_index = from_region->young_index_in_cset()+1; |
| 20223 | 206 assert( (from_region->is_young() && young_index > 0) || |
| 207 (!from_region->is_young() && young_index == 0), "invariant" ); | |
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208 const AllocationContext_t context = from_region->allocation_context(); |
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209 |
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210 uint age = 0; |
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211 InCSetState dest_state = next_state(state, old_mark, age); |
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212 HeapWord* obj_ptr = _g1_par_allocator->plab_allocate(dest_state, word_sz, context); |
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213 |
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214 // PLAB allocations should succeed most of the time, so we'll |
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215 // normally check against NULL once and that's it. |
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216 if (obj_ptr == NULL) { |
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217 obj_ptr = _g1_par_allocator->allocate_direct_or_new_plab(dest_state, word_sz, context); |
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218 if (obj_ptr == NULL) { |
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219 obj_ptr = allocate_in_next_plab(state, &dest_state, word_sz, context); |
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220 if (obj_ptr == NULL) { |
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221 // This will either forward-to-self, or detect that someone else has |
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222 // installed a forwarding pointer. |
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223 return _g1h->handle_evacuation_failure_par(this, old); |
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224 } |
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225 } |
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226 } |
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227 |
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228 assert(obj_ptr != NULL, "when we get here, allocation should have succeeded"); |
| 20223 | 229 #ifndef PRODUCT |
| 230 // Should this evacuation fail? | |
| 231 if (_g1h->evacuation_should_fail()) { | |
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232 // Doing this after all the allocation attempts also tests the |
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233 // undo_allocation() method too. |
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234 _g1_par_allocator->undo_allocation(dest_state, obj_ptr, word_sz, context); |
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235 return _g1h->handle_evacuation_failure_par(this, old); |
| 20223 | 236 } |
| 237 #endif // !PRODUCT | |
| 238 | |
| 239 // We're going to allocate linearly, so might as well prefetch ahead. | |
| 240 Prefetch::write(obj_ptr, PrefetchCopyIntervalInBytes); | |
| 241 | |
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242 const oop obj = oop(obj_ptr); |
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243 const oop forward_ptr = old->forward_to_atomic(obj); |
| 20223 | 244 if (forward_ptr == NULL) { |
| 245 Copy::aligned_disjoint_words((HeapWord*) old, obj_ptr, word_sz); | |
| 246 | |
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247 if (dest_state.is_young()) { |
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248 if (age < markOopDesc::max_age) { |
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249 age++; |
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250 } |
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251 if (old_mark->has_displaced_mark_helper()) { |
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252 // In this case, we have to install the mark word first, |
| 20223 | 253 // otherwise obj looks to be forwarded (the old mark word, |
| 254 // which contains the forward pointer, was copied) | |
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255 obj->set_mark(old_mark); |
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256 markOop new_mark = old_mark->displaced_mark_helper()->set_age(age); |
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257 old_mark->set_displaced_mark_helper(new_mark); |
| 20223 | 258 } else { |
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259 obj->set_mark(old_mark->set_age(age)); |
| 20223 | 260 } |
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261 age_table()->add(age, word_sz); |
| 20223 | 262 } else { |
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263 obj->set_mark(old_mark); |
| 20223 | 264 } |
| 265 | |
| 266 if (G1StringDedup::is_enabled()) { | |
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267 const bool is_from_young = state.is_young(); |
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268 const bool is_to_young = dest_state.is_young(); |
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269 assert(is_from_young == _g1h->heap_region_containing_raw(old)->is_young(), |
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270 "sanity"); |
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271 assert(is_to_young == _g1h->heap_region_containing_raw(obj)->is_young(), |
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272 "sanity"); |
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273 G1StringDedup::enqueue_from_evacuation(is_from_young, |
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274 is_to_young, |
| 20223 | 275 queue_num(), |
| 276 obj); | |
| 277 } | |
| 278 | |
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279 size_t* const surv_young_words = surviving_young_words(); |
| 20223 | 280 surv_young_words[young_index] += word_sz; |
| 281 | |
| 282 if (obj->is_objArray() && arrayOop(obj)->length() >= ParGCArrayScanChunk) { | |
| 283 // We keep track of the next start index in the length field of | |
| 284 // the to-space object. The actual length can be found in the | |
| 285 // length field of the from-space object. | |
| 286 arrayOop(obj)->set_length(0); | |
| 287 oop* old_p = set_partial_array_mask(old); | |
| 288 push_on_queue(old_p); | |
| 289 } else { | |
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290 HeapRegion* const to_region = _g1h->heap_region_containing_raw(obj_ptr); |
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291 _scanner.set_region(to_region); |
| 20223 | 292 obj->oop_iterate_backwards(&_scanner); |
| 293 } | |
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294 return obj; |
| 20223 | 295 } else { |
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296 _g1_par_allocator->undo_allocation(dest_state, obj_ptr, word_sz, context); |
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297 return forward_ptr; |
| 20223 | 298 } |
| 299 } |