Mercurial > hg > truffle
annotate src/share/vm/ci/ciObjArrayKlass.hpp @ 20543:e7d0505c8a30
8059758: Footprint regressions with JDK-8038423
Summary: Changes in JDK-8038423 always initialize (zero out) virtual memory used for auxiliary data structures. This causes a footprint regression for G1 in startup benchmarks. This is because they do not touch that memory at all, so the operating system does not actually commit these pages. The fix is to, if the initialization value of the data structures matches the default value of just committed memory (=0), do not do anything.
Reviewed-by: jwilhelm, brutisso
| author | tschatzl |
|---|---|
| date | Fri, 10 Oct 2014 15:51:58 +0200 |
| parents | 55fb97c4c58d |
| children | 4ca6dc0799b6 |
| rev | line source |
|---|---|
| 0 | 1 /* |
|
17467
55fb97c4c58d
8029233: Update copyright year to match last edit in jdk8 hotspot repository for 2013
mikael
parents:
12875
diff
changeset
|
2 * Copyright (c) 1999, 2013, 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:
0
diff
changeset
|
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
|
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
0
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:
0
diff
changeset
|
21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_CI_CIOBJARRAYKLASS_HPP |
| 26 #define SHARE_VM_CI_CIOBJARRAYKLASS_HPP | |
| 27 | |
| 28 #include "ci/ciArrayKlass.hpp" | |
| 29 | |
| 0 | 30 // ciObjArrayKlass |
| 31 // | |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
1972
diff
changeset
|
32 // This class represents a Klass* in the HotSpot virtual machine |
|
6831
d8ce2825b193
8000213: NPG: Should have renamed arrayKlass and typeArrayKlass
coleenp
parents:
6725
diff
changeset
|
33 // whose Klass part is an ObjArrayKlass. |
| 0 | 34 class ciObjArrayKlass : public ciArrayKlass { |
| 35 CI_PACKAGE_ACCESS | |
| 36 friend class ciEnv; | |
| 37 | |
| 38 private: | |
| 39 ciKlass* _element_klass; | |
| 40 ciKlass* _base_element_klass; | |
| 41 | |
| 42 protected: | |
| 43 ciObjArrayKlass(KlassHandle h_k); | |
| 44 ciObjArrayKlass(ciSymbol* array_name, | |
| 45 ciKlass* base_element_klass, | |
| 46 int dimension); | |
| 47 | |
|
6831
d8ce2825b193
8000213: NPG: Should have renamed arrayKlass and typeArrayKlass
coleenp
parents:
6725
diff
changeset
|
48 ObjArrayKlass* get_ObjArrayKlass() { |
|
d8ce2825b193
8000213: NPG: Should have renamed arrayKlass and typeArrayKlass
coleenp
parents:
6725
diff
changeset
|
49 return (ObjArrayKlass*)get_Klass(); |
| 0 | 50 } |
| 51 | |
| 52 static ciObjArrayKlass* make_impl(ciKlass* element_klass); | |
| 53 static ciSymbol* construct_array_name(ciSymbol* element_name, | |
| 54 int dimension); | |
| 55 | |
| 56 const char* type_string() { return "ciObjArrayKlass"; } | |
| 57 | |
| 58 oop loader() { return _base_element_klass->loader(); } | |
| 59 jobject loader_handle() { return _base_element_klass->loader_handle(); } | |
| 60 | |
| 61 oop protection_domain() { return _base_element_klass->protection_domain(); } | |
| 62 jobject protection_domain_handle() { return _base_element_klass->protection_domain_handle(); } | |
| 63 | |
| 64 | |
| 65 public: | |
| 66 // The one-level type of the array elements. | |
| 67 ciKlass* element_klass(); | |
| 68 | |
| 69 // The innermost type of the array elements. | |
| 70 ciKlass* base_element_klass() { return _base_element_klass; } | |
| 71 | |
| 72 // What kind of ciObject is this? | |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
1972
diff
changeset
|
73 bool is_obj_array_klass() const { return true; } |
| 0 | 74 |
| 75 static ciObjArrayKlass* make(ciKlass* element_klass); | |
|
12875
d13d7aba8c12
8023657: New type profiling points: arguments to call
roland
parents:
6831
diff
changeset
|
76 |
|
d13d7aba8c12
8023657: New type profiling points: arguments to call
roland
parents:
6831
diff
changeset
|
77 virtual ciKlass* exact_klass(); |
| 0 | 78 }; |
| 1972 | 79 |
| 80 #endif // SHARE_VM_CI_CIOBJARRAYKLASS_HPP |