Mercurial > hg > truffle
annotate src/share/vm/prims/jvm_misc.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 /* |
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8029233: Update copyright year to match last edit in jdk8 hotspot repository for 2013
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2 * Copyright (c) 1998, 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 * | |
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6941466: Oracle rebranding changes for Hotspot repositories
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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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c18cbe5936b8
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_PRIMS_JVM_MISC_HPP |
| 26 #define SHARE_VM_PRIMS_JVM_MISC_HPP | |
| 27 | |
| 28 #include "prims/jni.h" | |
| 29 #include "runtime/handles.hpp" | |
| 30 | |
| 0 | 31 // Useful entry points shared by JNI and JVM interface. |
| 32 // We do not allow real JNI or JVM entry point to call each other. | |
| 33 | |
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6990754: Use native memory and reference counting to implement SymbolTable
coleenp
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34 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, Handle loader, Handle protection_domain, jboolean throwError, TRAPS); |
| 0 | 35 |
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36 void trace_class_resolution(Klass* to_class); |
| 0 | 37 |
| 38 /* | |
| 39 * Support for -Xcheck:jni | |
| 40 */ | |
| 41 | |
| 42 extern struct JNINativeInterface_* jni_functions_nocheck(); | |
| 43 extern struct JNINativeInterface_* jni_functions_check(); | |
| 44 | |
| 45 /* | |
| 46 * Support for swappable jni function table. | |
| 47 */ | |
| 48 extern struct JNINativeInterface_* jni_functions(); | |
| 49 extern void copy_jni_function_table(const struct JNINativeInterface_* new_function_table); | |
| 50 | |
| 51 // Support for fast JNI accessors | |
| 52 extern "C" { | |
| 53 typedef jboolean (JNICALL *GetBooleanField_t) | |
| 54 (JNIEnv *env, jobject obj, jfieldID fieldID); | |
| 55 typedef jbyte (JNICALL *GetByteField_t) | |
| 56 (JNIEnv *env, jobject obj, jfieldID fieldID); | |
| 57 typedef jchar (JNICALL *GetCharField_t) | |
| 58 (JNIEnv *env, jobject obj, jfieldID fieldID); | |
| 59 typedef jshort (JNICALL *GetShortField_t) | |
| 60 (JNIEnv *env, jobject obj, jfieldID fieldID); | |
| 61 typedef jint (JNICALL *GetIntField_t) | |
| 62 (JNIEnv *env, jobject obj, jfieldID fieldID); | |
| 63 typedef jlong (JNICALL *GetLongField_t) | |
| 64 (JNIEnv *env, jobject obj, jfieldID fieldID); | |
| 65 typedef jfloat (JNICALL *GetFloatField_t) | |
| 66 (JNIEnv *env, jobject obj, jfieldID fieldID); | |
| 67 typedef jdouble (JNICALL *GetDoubleField_t) | |
| 68 (JNIEnv *env, jobject obj, jfieldID fieldID); | |
| 69 } | |
| 70 | |
| 71 void quicken_jni_functions(); | |
| 72 address jni_GetBooleanField_addr(); | |
| 73 address jni_GetByteField_addr(); | |
| 74 address jni_GetCharField_addr(); | |
| 75 address jni_GetShortField_addr(); | |
| 76 address jni_GetIntField_addr(); | |
| 77 address jni_GetLongField_addr(); | |
| 78 address jni_GetFloatField_addr(); | |
| 79 address jni_GetDoubleField_addr(); | |
| 1972 | 80 |
| 81 #endif // SHARE_VM_PRIMS_JVM_MISC_HPP |