Mercurial > hg > truffle
annotate src/share/vm/prims/jvmtiManageCapabilities.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 | f95d63e2154a |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1972 | 2 * Copyright (c) 2003, 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 * | |
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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. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_PRIMS_JVMTIMANAGECAPABILITIES_HPP |
| 26 #define SHARE_VM_PRIMS_JVMTIMANAGECAPABILITIES_HPP | |
| 0 | 27 |
| 1972 | 28 #include "jvmtifiles/jvmti.h" |
| 29 #include "memory/allocation.hpp" | |
| 0 | 30 |
| 31 class JvmtiManageCapabilities : public AllStatic { | |
| 32 | |
| 33 private: | |
| 34 | |
| 35 // these four capabilities sets represent all potentially | |
| 36 // available capabilities. They are disjoint, covering | |
| 37 // the four cases: (OnLoad vs OnLoad+live phase) X | |
| 38 // (one environment vs any environment). | |
| 39 static jvmtiCapabilities always_capabilities; | |
| 40 static jvmtiCapabilities onload_capabilities; | |
| 41 static jvmtiCapabilities always_solo_capabilities; | |
| 42 static jvmtiCapabilities onload_solo_capabilities; | |
| 43 | |
| 44 // solo capabilities that have not been grabbed | |
| 45 static jvmtiCapabilities always_solo_remaining_capabilities; | |
| 46 static jvmtiCapabilities onload_solo_remaining_capabilities; | |
| 47 | |
| 48 // all capabilities ever acquired | |
| 49 static jvmtiCapabilities acquired_capabilities; | |
| 50 | |
| 51 // basic intenal operations | |
| 52 static jvmtiCapabilities *either(const jvmtiCapabilities *a, const jvmtiCapabilities *b, jvmtiCapabilities *result); | |
| 53 static jvmtiCapabilities *both(const jvmtiCapabilities *a, const jvmtiCapabilities *b, jvmtiCapabilities *result); | |
| 54 static jvmtiCapabilities *exclude(const jvmtiCapabilities *a, const jvmtiCapabilities *b, jvmtiCapabilities *result); | |
| 55 static bool has_some(const jvmtiCapabilities *a); | |
| 56 static void update(); | |
| 57 | |
| 58 // init functions | |
| 59 static jvmtiCapabilities init_always_capabilities(); | |
| 60 static jvmtiCapabilities init_onload_capabilities(); | |
| 61 static jvmtiCapabilities init_always_solo_capabilities(); | |
| 62 static jvmtiCapabilities init_onload_solo_capabilities(); | |
| 63 | |
| 64 public: | |
| 65 static void initialize(); | |
| 66 | |
| 67 // may have to adjust always capabilities when VM initialization has completed | |
| 68 static void recompute_always_capabilities(); | |
| 69 | |
| 70 // queries and actions | |
| 71 static void get_potential_capabilities(const jvmtiCapabilities *current, | |
| 72 const jvmtiCapabilities *prohibited, | |
| 73 jvmtiCapabilities *result); | |
| 74 static jvmtiError add_capabilities(const jvmtiCapabilities *current, | |
| 75 const jvmtiCapabilities *prohibited, | |
| 76 const jvmtiCapabilities *desired, | |
| 77 jvmtiCapabilities *result); | |
| 78 static void relinquish_capabilities(const jvmtiCapabilities *current, | |
| 79 const jvmtiCapabilities *unwanted, | |
| 80 jvmtiCapabilities *result); | |
| 81 static void copy_capabilities(const jvmtiCapabilities *from, jvmtiCapabilities *to); | |
| 82 | |
| 83 #ifndef PRODUCT | |
| 84 static void print(const jvmtiCapabilities* caps); | |
| 85 #endif | |
| 86 }; | |
| 87 | |
| 1972 | 88 #endif // SHARE_VM_PRIMS_JVMTIMANAGECAPABILITIES_HPP |