Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/g1RemSet.inline.hpp @ 1705:2d160770d2e5
6814437: G1: remove the _new_refs array
Summary: The per-worker _new_refs array is used to hold references that point into the collection set. It is populated during RSet updating and subsequently processed. In the event of an evacuation failure it processed again to recreate the RSets of regions in the collection set. Remove the per-worker _new_refs array by processing the references directly. Use a DirtyCardQueue to hold the cards containing the references so that the RSets of regions in the collection set can be recreated when handling an evacuation failure.
Reviewed-by: iveresov, jmasa, tonyp
| author | johnc |
|---|---|
| date | Mon, 02 Aug 2010 12:51:43 -0700 |
| parents | c18cbe5936b8 |
| children | a03ae377b2e8 |
| rev | line source |
|---|---|
| 342 | 1 /* |
| 1705 | 2 * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved. |
| 342 | 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. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 25 inline size_t G1RemSet::n_workers() { | |
| 26 if (_g1->workers() != NULL) { | |
| 27 return _g1->workers()->total_workers(); | |
| 28 } else { | |
| 29 return 1; | |
| 30 } | |
| 31 } | |
| 32 | |
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33 template <class T> inline void HRInto_G1RemSet::write_ref_nv(HeapRegion* from, T* p) { |
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34 par_write_ref_nv(from, p, 0); |
| 342 | 35 } |
| 36 | |
| 37 inline bool HRInto_G1RemSet::self_forwarded(oop obj) { | |
| 38 bool result = (obj->is_forwarded() && (obj->forwardee()== obj)); | |
| 39 return result; | |
| 40 } | |
| 41 | |
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42 template <class T> inline void HRInto_G1RemSet::par_write_ref_nv(HeapRegion* from, T* p, int tid) { |
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43 oop obj = oopDesc::load_decode_heap_oop(p); |
| 342 | 44 #ifdef ASSERT |
| 45 // can't do because of races | |
| 46 // assert(obj == NULL || obj->is_oop(), "expected an oop"); | |
| 47 | |
| 48 // Do the safe subset of is_oop | |
| 49 if (obj != NULL) { | |
| 50 #ifdef CHECK_UNHANDLED_OOPS | |
| 51 oopDesc* o = obj.obj(); | |
| 52 #else | |
| 53 oopDesc* o = obj; | |
| 54 #endif // CHECK_UNHANDLED_OOPS | |
| 55 assert((intptr_t)o % MinObjAlignmentInBytes == 0, "not oop aligned"); | |
| 56 assert(Universe::heap()->is_in_reserved(obj), "must be in heap"); | |
| 57 } | |
| 58 #endif // ASSERT | |
| 1705 | 59 |
| 60 assert(from == NULL || from->is_in_reserved(p), "p is not in from"); | |
| 61 | |
| 342 | 62 HeapRegion* to = _g1->heap_region_containing(obj); |
| 63 // The test below could be optimized by applying a bit op to to and from. | |
| 64 if (to != NULL && from != NULL && from != to) { | |
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65 // The _par_traversal_in_progress flag is true during the collection pause, |
| 1705 | 66 // false during the evacuation failure handing. This should avoid a |
| 67 // potential loop if we were to add the card containing 'p' to the DCQS | |
| 68 // that's used to regenerate the remembered sets for the collection set, | |
| 69 // in the event of an evacuation failure, here. The UpdateRSImmediate | |
| 70 // closure will eventally call this routine. | |
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71 if (_par_traversal_in_progress && |
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72 to->in_collection_set() && !self_forwarded(obj)) { |
| 1705 | 73 |
| 74 assert(_cset_rs_update_cl[tid] != NULL, "should have been set already"); | |
| 75 _cset_rs_update_cl[tid]->do_oop(p); | |
| 76 | |
| 77 // Deferred updates to the CSet are either discarded (in the normal case), | |
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78 // or processed (if an evacuation failure occurs) at the end |
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79 // of the collection. |
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80 // See HRInto_G1RemSet::cleanup_after_oops_into_collection_set_do(). |
| 677 | 81 } else { |
| 342 | 82 #if G1_REM_SET_LOGGING |
| 83 gclog_or_tty->print_cr("Adding " PTR_FORMAT " (" PTR_FORMAT ") to RS" | |
| 84 " for region [" PTR_FORMAT ", " PTR_FORMAT ")", | |
| 85 p, obj, | |
| 86 to->bottom(), to->end()); | |
| 87 #endif | |
| 88 assert(to->rem_set() != NULL, "Need per-region 'into' remsets."); | |
| 677 | 89 to->rem_set()->add_reference(p, tid); |
| 342 | 90 } |
| 91 } | |
| 92 } | |
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93 |
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94 template <class T> inline void UpdateRSOopClosure::do_oop_work(T* p) { |
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95 assert(_from != NULL, "from region must be non-NULL"); |
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96 _rs->par_write_ref(_from, p, _worker_i); |
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97 } |
| 1705 | 98 |
| 99 template <class T> inline void UpdateRSetImmediate::do_oop_work(T* p) { | |
| 100 assert(_from->is_in_reserved(p), "paranoia"); | |
| 101 T heap_oop = oopDesc::load_heap_oop(p); | |
| 102 if (!oopDesc::is_null(heap_oop) && !_from->is_survivor()) { | |
| 103 _g1_rem_set->par_write_ref(_from, p, 0); | |
| 104 } | |
| 105 } | |
| 106 |