Mercurial > hg > truffle
annotate src/share/vm/memory/cardTableRS.hpp @ 2368:dde920245681
6896099: Integrate CMS heap ergo with default heap sizing ergo
6627787: CMS: JVM refuses to start up with -Xms16m -Xmx16m
7000125: CMS: Anti-monotone young gen sizing with respect to maximum whole heap size specification
7027529: CMS: retire CMSUseOldDefaults flag
Summary: Simplify CMS heap sizing code, relying on ergonomic initial sizing consistent with other collectors for the most part, controlling only young gen sizing to rein in pause times. Make CMS young gen sizing default statically cpu-dependant. Remove inconsistencies wrt generation sizing and policy code, allowing for the fixing for 6627787 and 7000125. For 7027529, retire the flag CMSUseOldDefaults which had been introduced as a bridge from JDK 5 to JDK 6 a number of years ago.
Reviewed-by: brutisso, poonam
| author | ysr |
|---|---|
| date | Wed, 16 Mar 2011 10:37:08 -0700 |
| parents | f95d63e2154a |
| children | c48ad6ab8bdf |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1972 | 2 * Copyright (c) 2001, 2010, 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 * | |
|
1552
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
356
diff
changeset
|
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
|
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
356
diff
changeset
|
20 * or visit www.oracle.com if you need additional information or have any |
|
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
356
diff
changeset
|
21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_MEMORY_CARDTABLERS_HPP |
| 26 #define SHARE_VM_MEMORY_CARDTABLERS_HPP | |
| 27 | |
| 28 #include "memory/cardTableModRefBS.hpp" | |
| 29 #include "memory/genRemSet.hpp" | |
| 30 #include "memory/memRegion.hpp" | |
| 31 | |
| 0 | 32 class Space; |
| 33 class OopsInGenClosure; | |
| 34 class DirtyCardToOopClosure; | |
| 35 | |
| 36 // This kind of "GenRemSet" uses a card table both as shared data structure | |
| 37 // for a mod ref barrier set and for the rem set information. | |
| 38 | |
| 39 class CardTableRS: public GenRemSet { | |
| 40 friend class VMStructs; | |
| 41 // Below are private classes used in impl. | |
| 42 friend class VerifyCTSpaceClosure; | |
| 43 friend class ClearNoncleanCardWrapper; | |
| 44 | |
| 45 static jbyte clean_card_val() { | |
| 46 return CardTableModRefBS::clean_card; | |
| 47 } | |
| 48 | |
| 49 static bool | |
| 50 card_is_dirty_wrt_gen_iter(jbyte cv) { | |
| 51 return CardTableModRefBS::card_is_dirty_wrt_gen_iter(cv); | |
| 52 } | |
| 53 | |
|
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
54 CardTableModRefBSForCTRS* _ct_bs; |
| 0 | 55 |
| 56 virtual void younger_refs_in_space_iterate(Space* sp, OopsInGenClosure* cl); | |
| 57 | |
| 58 void verify_space(Space* s, HeapWord* gen_start); | |
| 59 | |
| 60 enum ExtendedCardValue { | |
| 61 youngergen_card = CardTableModRefBS::CT_MR_BS_last_reserved + 1, | |
| 62 // These are for parallel collection. | |
| 63 // There are three P (parallel) youngergen card values. In general, this | |
| 64 // needs to be more than the number of generations (including the perm | |
| 65 // gen) that might have younger_refs_do invoked on them separately. So | |
| 66 // if we add more gens, we have to add more values. | |
| 67 youngergenP1_card = CardTableModRefBS::CT_MR_BS_last_reserved + 2, | |
| 68 youngergenP2_card = CardTableModRefBS::CT_MR_BS_last_reserved + 3, | |
| 69 youngergenP3_card = CardTableModRefBS::CT_MR_BS_last_reserved + 4, | |
| 70 cur_youngergen_and_prev_nonclean_card = | |
| 71 CardTableModRefBS::CT_MR_BS_last_reserved + 5 | |
| 72 }; | |
| 73 | |
| 74 // An array that contains, for each generation, the card table value last | |
| 75 // used as the current value for a younger_refs_do iteration of that | |
| 76 // portion of the table. (The perm gen is index 0; other gens are at | |
| 77 // their level plus 1. They youngest gen is in the table, but will | |
| 78 // always have the value "clean_card".) | |
| 79 jbyte* _last_cur_val_in_gen; | |
| 80 | |
| 81 jbyte _cur_youngergen_card_val; | |
| 82 | |
|
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
83 int _regions_to_iterate; |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
84 |
| 0 | 85 jbyte cur_youngergen_card_val() { |
| 86 return _cur_youngergen_card_val; | |
| 87 } | |
| 88 void set_cur_youngergen_card_val(jbyte v) { | |
| 89 _cur_youngergen_card_val = v; | |
| 90 } | |
| 91 bool is_prev_youngergen_card_val(jbyte v) { | |
| 92 return | |
| 93 youngergen_card <= v && | |
| 94 v < cur_youngergen_and_prev_nonclean_card && | |
| 95 v != _cur_youngergen_card_val; | |
| 96 } | |
| 97 // Return a youngergen_card_value that is not currently in use. | |
| 98 jbyte find_unused_youngergenP_card_value(); | |
| 99 | |
| 100 public: | |
| 101 CardTableRS(MemRegion whole_heap, int max_covered_regions); | |
| 102 | |
| 103 // *** GenRemSet functions. | |
| 104 GenRemSet::Name rs_kind() { return GenRemSet::CardTable; } | |
| 105 | |
| 106 CardTableRS* as_CardTableRS() { return this; } | |
| 107 | |
|
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
108 CardTableModRefBS* ct_bs() { return _ct_bs; } |
| 0 | 109 |
| 110 // Override. | |
| 111 void prepare_for_younger_refs_iterate(bool parallel); | |
| 112 | |
| 113 // Card table entries are cleared before application; "blk" is | |
| 114 // responsible for dirtying if the oop is still older-to-younger after | |
| 115 // closure application. | |
| 116 void younger_refs_iterate(Generation* g, OopsInGenClosure* blk); | |
| 117 | |
|
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
6
diff
changeset
|
118 void inline_write_ref_field_gc(void* field, oop new_val) { |
|
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
119 jbyte* byte = _ct_bs->byte_for(field); |
| 0 | 120 *byte = youngergen_card; |
| 121 } | |
|
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
6
diff
changeset
|
122 void write_ref_field_gc_work(void* field, oop new_val) { |
| 0 | 123 inline_write_ref_field_gc(field, new_val); |
| 124 } | |
| 125 | |
| 126 // Override. Might want to devirtualize this in the same fashion as | |
| 127 // above. Ensures that the value of the card for field says that it's | |
| 128 // a younger card in the current collection. | |
|
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
6
diff
changeset
|
129 virtual void write_ref_field_gc_par(void* field, oop new_val); |
| 0 | 130 |
| 131 void resize_covered_region(MemRegion new_region); | |
| 132 | |
| 133 bool is_aligned(HeapWord* addr) { | |
|
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
134 return _ct_bs->is_card_aligned(addr); |
| 0 | 135 } |
| 136 | |
| 137 void verify(); | |
|
6
73e96e5c30df
6624765: Guarantee failure "Unexpected dirty card found"
jmasa
parents:
0
diff
changeset
|
138 void verify_aligned_region_empty(MemRegion mr); |
| 0 | 139 |
|
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
140 void clear(MemRegion mr) { _ct_bs->clear(mr); } |
| 0 | 141 void clear_into_younger(Generation* gen, bool clear_perm); |
| 142 | |
|
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
143 void invalidate(MemRegion mr, bool whole_heap = false) { |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
144 _ct_bs->invalidate(mr, whole_heap); |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
145 } |
| 0 | 146 void invalidate_or_clear(Generation* gen, bool younger, bool perm); |
| 147 | |
| 148 static uintx ct_max_alignment_constraint() { | |
| 149 return CardTableModRefBS::ct_max_alignment_constraint(); | |
| 150 } | |
| 151 | |
|
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
152 jbyte* byte_for(void* p) { return _ct_bs->byte_for(p); } |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
153 jbyte* byte_after(void* p) { return _ct_bs->byte_after(p); } |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
154 HeapWord* addr_for(jbyte* p) { return _ct_bs->addr_for(p); } |
| 0 | 155 |
| 156 bool is_prev_nonclean_card_val(jbyte v) { | |
| 157 return | |
| 158 youngergen_card <= v && | |
| 159 v <= cur_youngergen_and_prev_nonclean_card && | |
| 160 v != _cur_youngergen_card_val; | |
| 161 } | |
| 162 | |
| 163 static bool youngergen_may_have_been_dirty(jbyte cv) { | |
| 164 return cv == CardTableRS::cur_youngergen_and_prev_nonclean_card; | |
| 165 } | |
| 166 | |
| 167 }; | |
| 1972 | 168 |
| 169 #endif // SHARE_VM_MEMORY_CARDTABLERS_HPP |