Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1ParScanThreadState.inline.hpp @ 20382:b1266b08b994
8056043: Heap does not shrink within the heap after JDK-8038423
Summary: Enable shrinking within the heap by removing some code added for JDK-8054818. Enable the test case that checks that again too.
Reviewed-by: jwilhelm, jmasa
| author | tschatzl |
|---|---|
| date | Wed, 03 Sep 2014 09:24:07 +0200 |
| parents | a3953c777565 |
| children | 6948da6d7c13 |
| 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 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1PARSCANTHREADSTATE_INLINE_HPP | |
| 26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1PARSCANTHREADSTATE_INLINE_HPP | |
| 27 | |
| 28 #include "gc_implementation/g1/g1ParScanThreadState.hpp" | |
| 29 #include "gc_implementation/g1/g1RemSet.inline.hpp" | |
| 30 #include "oops/oop.inline.hpp" | |
| 31 | |
| 32 template <class T> inline void G1ParScanThreadState::immediate_rs_update(HeapRegion* from, T* p, int tid) { | |
| 33 if (!from->is_survivor()) { | |
| 34 _g1_rem->par_write_ref(from, p, tid); | |
| 35 } | |
| 36 } | |
| 37 | |
| 38 template <class T> void G1ParScanThreadState::update_rs(HeapRegion* from, T* p, int tid) { | |
| 39 if (G1DeferredRSUpdate) { | |
| 40 deferred_rs_update(from, p, tid); | |
| 41 } else { | |
| 42 immediate_rs_update(from, p, tid); | |
| 43 } | |
| 44 } | |
| 45 | |
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46 template <class T> void G1ParScanThreadState::do_oop_evac(T* p, HeapRegion* from) { |
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47 assert(!oopDesc::is_null(oopDesc::load_decode_heap_oop(p)), |
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48 "Reference should not be NULL here as such are never pushed to the task queue."); |
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49 oop obj = oopDesc::load_decode_heap_oop_not_null(p); |
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50 |
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51 // Although we never intentionally push references outside of the collection |
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52 // set, due to (benign) races in the claim mechanism during RSet scanning more |
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53 // than one thread might claim the same card. So the same card may be |
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54 // processed multiple times. So redo this check. |
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55 G1CollectedHeap::in_cset_state_t in_cset_state = _g1h->in_cset_state(obj); |
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56 if (in_cset_state == G1CollectedHeap::InCSet) { |
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57 oop forwardee; |
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58 if (obj->is_forwarded()) { |
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59 forwardee = obj->forwardee(); |
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60 } else { |
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61 forwardee = copy_to_survivor_space(obj); |
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62 } |
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63 oopDesc::encode_store_heap_oop(p, forwardee); |
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64 } else if (in_cset_state == G1CollectedHeap::IsHumongous) { |
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65 _g1h->set_humongous_is_live(obj); |
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66 } else { |
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67 assert(in_cset_state == G1CollectedHeap::InNeither, |
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68 err_msg("In_cset_state must be InNeither here, but is %d", in_cset_state)); |
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69 } |
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70 |
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71 assert(obj != NULL, "Must be"); |
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72 update_rs(from, p, queue_num()); |
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73 } |
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74 |
| 20223 | 75 inline void G1ParScanThreadState::do_oop_partial_array(oop* p) { |
| 76 assert(has_partial_array_mask(p), "invariant"); | |
| 77 oop from_obj = clear_partial_array_mask(p); | |
| 78 | |
| 79 assert(Universe::heap()->is_in_reserved(from_obj), "must be in heap."); | |
| 80 assert(from_obj->is_objArray(), "must be obj array"); | |
| 81 objArrayOop from_obj_array = objArrayOop(from_obj); | |
| 82 // The from-space object contains the real length. | |
| 83 int length = from_obj_array->length(); | |
| 84 | |
| 85 assert(from_obj->is_forwarded(), "must be forwarded"); | |
| 86 oop to_obj = from_obj->forwardee(); | |
| 87 assert(from_obj != to_obj, "should not be chunking self-forwarded objects"); | |
| 88 objArrayOop to_obj_array = objArrayOop(to_obj); | |
| 89 // We keep track of the next start index in the length field of the | |
| 90 // to-space object. | |
| 91 int next_index = to_obj_array->length(); | |
| 92 assert(0 <= next_index && next_index < length, | |
| 93 err_msg("invariant, next index: %d, length: %d", next_index, length)); | |
| 94 | |
| 95 int start = next_index; | |
| 96 int end = length; | |
| 97 int remainder = end - start; | |
| 98 // We'll try not to push a range that's smaller than ParGCArrayScanChunk. | |
| 99 if (remainder > 2 * ParGCArrayScanChunk) { | |
| 100 end = start + ParGCArrayScanChunk; | |
| 101 to_obj_array->set_length(end); | |
| 102 // Push the remainder before we process the range in case another | |
| 103 // worker has run out of things to do and can steal it. | |
| 104 oop* from_obj_p = set_partial_array_mask(from_obj); | |
| 105 push_on_queue(from_obj_p); | |
| 106 } else { | |
| 107 assert(length == end, "sanity"); | |
| 108 // We'll process the final range for this object. Restore the length | |
| 109 // so that the heap remains parsable in case of evacuation failure. | |
| 110 to_obj_array->set_length(end); | |
| 111 } | |
| 112 _scanner.set_region(_g1h->heap_region_containing_raw(to_obj)); | |
| 113 // Process indexes [start,end). It will also process the header | |
| 114 // along with the first chunk (i.e., the chunk with start == 0). | |
| 115 // Note that at this point the length field of to_obj_array is not | |
| 116 // correct given that we are using it to keep track of the next | |
| 117 // start index. oop_iterate_range() (thankfully!) ignores the length | |
| 118 // field and only relies on the start / end parameters. It does | |
| 119 // however return the size of the object which will be incorrect. So | |
| 120 // we have to ignore it even if we wanted to use it. | |
| 121 to_obj_array->oop_iterate_range(&_scanner, start, end); | |
| 122 } | |
| 123 | |
| 124 template <class T> inline void G1ParScanThreadState::deal_with_reference(T* ref_to_scan) { | |
| 125 if (!has_partial_array_mask(ref_to_scan)) { | |
| 126 // Note: we can use "raw" versions of "region_containing" because | |
| 127 // "obj_to_scan" is definitely in the heap, and is not in a | |
| 128 // humongous region. | |
| 129 HeapRegion* r = _g1h->heap_region_containing_raw(ref_to_scan); | |
| 130 do_oop_evac(ref_to_scan, r); | |
| 131 } else { | |
| 132 do_oop_partial_array((oop*)ref_to_scan); | |
| 133 } | |
| 134 } | |
| 135 | |
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136 inline void G1ParScanThreadState::dispatch_reference(StarTask ref) { |
| 20223 | 137 assert(verify_task(ref), "sanity"); |
| 138 if (ref.is_narrow()) { | |
| 139 deal_with_reference((narrowOop*)ref); | |
| 140 } else { | |
| 141 deal_with_reference((oop*)ref); | |
| 142 } | |
| 143 } | |
| 144 | |
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145 void G1ParScanThreadState::steal_and_trim_queue(RefToScanQueueSet *task_queues) { |
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146 StarTask stolen_task; |
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147 while (task_queues->steal(queue_num(), hash_seed(), stolen_task)) { |
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148 assert(verify_task(stolen_task), "sanity"); |
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149 dispatch_reference(stolen_task); |
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150 |
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151 // We've just processed a reference and we might have made |
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152 // available new entries on the queues. So we have to make sure |
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153 // we drain the queues as necessary. |
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154 trim_queue(); |
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155 } |
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156 } |
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157 |
| 20223 | 158 #endif /* SHARE_VM_GC_IMPLEMENTATION_G1_G1PARSCANTHREADSTATE_INLINE_HPP */ |
| 159 |