Mercurial > hg > truffle
annotate src/share/vm/memory/genOopClosures.inline.hpp @ 453:c96030fff130
6684579: SoftReference processing can be made more efficient
Summary: For current soft-ref clearing policies, we can decide at marking time if a soft-reference will definitely not be cleared, postponing the decision of whether it will definitely be cleared to the final reference processing phase. This can be especially beneficial in the case of concurrent collectors where the marking is usually concurrent but reference processing is usually not.
Reviewed-by: jmasa
| author | ysr |
|---|---|
| date | Thu, 20 Nov 2008 16:56:09 -0800 |
| parents | 1ee8caae33af |
| children | df6caf649ff7 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 196 | 2 * Copyright 2001-2008 Sun Microsystems, Inc. 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 * | |
| 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 inline OopsInGenClosure::OopsInGenClosure(Generation* gen) : | |
| 26 OopClosure(gen->ref_processor()), _orig_gen(gen), _rs(NULL) { | |
| 27 set_generation(gen); | |
| 28 } | |
| 29 | |
| 30 inline void OopsInGenClosure::set_generation(Generation* gen) { | |
| 31 _gen = gen; | |
| 32 _gen_boundary = _gen->reserved().start(); | |
| 33 // Barrier set for the heap, must be set after heap is initialized | |
| 34 if (_rs == NULL) { | |
| 35 GenRemSet* rs = SharedHeap::heap()->rem_set(); | |
| 36 assert(rs->rs_kind() == GenRemSet::CardTable, "Wrong rem set kind"); | |
| 37 _rs = (CardTableRS*)rs; | |
| 38 } | |
| 39 } | |
| 40 | |
|
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
41 template <class T> inline void OopsInGenClosure::do_barrier(T* p) { |
| 0 | 42 assert(generation()->is_in_reserved(p), "expected ref in generation"); |
|
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
43 assert(!oopDesc::is_null(*p), "expected non-null object"); |
|
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
44 oop obj = oopDesc::load_decode_heap_oop_not_null(p); |
| 0 | 45 // If p points to a younger generation, mark the card. |
| 46 if ((HeapWord*)obj < _gen_boundary) { | |
| 47 _rs->inline_write_ref_field_gc(p, obj); | |
| 48 } | |
| 49 } | |
| 50 | |
|
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
51 inline void OopsInGenClosure::par_do_barrier(oop* p) { |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
52 assert(generation()->is_in_reserved(p), "expected ref in generation"); |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
53 oop obj = *p; |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
54 assert(obj != NULL, "expected non-null object"); |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
55 // If p points to a younger generation, mark the card. |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
56 if ((HeapWord*)obj < gen_boundary()) { |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
57 rs()->write_ref_field_gc_par(p, obj); |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
58 } |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
59 } |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
60 |
| 0 | 61 // NOTE! Any changes made here should also be made |
|
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
62 // in FastScanClosure::do_oop_work() |
|
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
63 template <class T> inline void ScanClosure::do_oop_work(T* p) { |
|
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
64 T heap_oop = oopDesc::load_heap_oop(p); |
| 0 | 65 // Should we copy the obj? |
|
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
66 if (!oopDesc::is_null(heap_oop)) { |
|
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
67 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
| 0 | 68 if ((HeapWord*)obj < _boundary) { |
| 69 assert(!_g->to()->is_in_reserved(obj), "Scanning field twice?"); | |
|
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
70 oop new_obj = obj->is_forwarded() ? obj->forwardee() |
|
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
71 : _g->copy_to_survivor_space(obj); |
|
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
72 oopDesc::encode_store_heap_oop_not_null(p, new_obj); |
| 0 | 73 } |
| 74 if (_gc_barrier) { | |
| 75 // Now call parent closure | |
| 76 do_barrier(p); | |
| 77 } | |
| 78 } | |
| 79 } | |
| 80 | |
|
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
81 inline void ScanClosure::do_oop_nv(oop* p) { ScanClosure::do_oop_work(p); } |
|
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
82 inline void ScanClosure::do_oop_nv(narrowOop* p) { ScanClosure::do_oop_work(p); } |
| 0 | 83 |
| 84 // NOTE! Any changes made here should also be made | |
|
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
85 // in ScanClosure::do_oop_work() |
|
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
86 template <class T> inline void FastScanClosure::do_oop_work(T* p) { |
|
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
87 T heap_oop = oopDesc::load_heap_oop(p); |
| 0 | 88 // Should we copy the obj? |
|
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
89 if (!oopDesc::is_null(heap_oop)) { |
|
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
90 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
| 0 | 91 if ((HeapWord*)obj < _boundary) { |
| 92 assert(!_g->to()->is_in_reserved(obj), "Scanning field twice?"); | |
|
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
93 oop new_obj = obj->is_forwarded() ? obj->forwardee() |
|
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
94 : _g->copy_to_survivor_space(obj); |
|
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
95 oopDesc::encode_store_heap_oop_not_null(p, new_obj); |
| 0 | 96 if (_gc_barrier) { |
| 97 // Now call parent closure | |
| 98 do_barrier(p); | |
| 99 } | |
| 100 } | |
| 101 } | |
| 102 } | |
| 103 | |
|
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
104 inline void FastScanClosure::do_oop_nv(oop* p) { FastScanClosure::do_oop_work(p); } |
|
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
105 inline void FastScanClosure::do_oop_nv(narrowOop* p) { FastScanClosure::do_oop_work(p); } |
| 0 | 106 |
| 107 // Note similarity to ScanClosure; the difference is that | |
| 108 // the barrier set is taken care of outside this closure. | |
|
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
109 template <class T> inline void ScanWeakRefClosure::do_oop_work(T* p) { |
|
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
110 assert(!oopDesc::is_null(*p), "null weak reference?"); |
|
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
111 oop obj = oopDesc::load_decode_heap_oop_not_null(p); |
| 0 | 112 // weak references are sometimes scanned twice; must check |
| 113 // that to-space doesn't already contain this object | |
| 114 if ((HeapWord*)obj < _boundary && !_g->to()->is_in_reserved(obj)) { | |
|
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
115 oop new_obj = obj->is_forwarded() ? obj->forwardee() |
|
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
116 : _g->copy_to_survivor_space(obj); |
|
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
117 oopDesc::encode_store_heap_oop_not_null(p, new_obj); |
| 0 | 118 } |
| 119 } | |
| 120 | |
|
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
121 inline void ScanWeakRefClosure::do_oop_nv(oop* p) { ScanWeakRefClosure::do_oop_work(p); } |
|
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
122 inline void ScanWeakRefClosure::do_oop_nv(narrowOop* p) { ScanWeakRefClosure::do_oop_work(p); } |