Mercurial > hg > truffle
view src/share/vm/prims/jvmtiExtensions.cpp @ 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 | b9a9ed0f8eeb |
children |
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/* * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #include "precompiled.hpp" #include "prims/jvmtiExport.hpp" #include "prims/jvmtiExtensions.hpp" // the list of extension functions GrowableArray<jvmtiExtensionFunctionInfo*>* JvmtiExtensions::_ext_functions; // the list of extension events GrowableArray<jvmtiExtensionEventInfo*>* JvmtiExtensions::_ext_events; // extension function static jvmtiError JNICALL IsClassUnloadingEnabled(const jvmtiEnv* env, jboolean* enabled, ...) { if (enabled == NULL) { return JVMTI_ERROR_NULL_POINTER; } *enabled = (jboolean)ClassUnloading; return JVMTI_ERROR_NONE; } // register extension functions and events. In this implementation we // have a single extension function (to prove the API) that tests if class // unloading is enabled or disabled. We also have a single extension event // EXT_EVENT_CLASS_UNLOAD which is used to provide the JVMDI_EVENT_CLASS_UNLOAD // event. The function and the event are registered here. // void JvmtiExtensions::register_extensions() { _ext_functions = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<jvmtiExtensionFunctionInfo*>(1,true); _ext_events = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<jvmtiExtensionEventInfo*>(1,true); // register our extension function static jvmtiParamInfo func_params[] = { { (char*)"IsClassUnloadingEnabled", JVMTI_KIND_OUT, JVMTI_TYPE_JBOOLEAN, JNI_FALSE } }; static jvmtiExtensionFunctionInfo ext_func = { (jvmtiExtensionFunction)IsClassUnloadingEnabled, (char*)"com.sun.hotspot.functions.IsClassUnloadingEnabled", (char*)"Tell if class unloading is enabled (-noclassgc)", sizeof(func_params)/sizeof(func_params[0]), func_params, 0, // no non-universal errors NULL }; _ext_functions->append(&ext_func); // register our extension event static jvmtiParamInfo event_params[] = { { (char*)"JNI Environment", JVMTI_KIND_IN, JVMTI_TYPE_JNIENV, JNI_FALSE }, { (char*)"Thread", JVMTI_KIND_IN, JVMTI_TYPE_JTHREAD, JNI_FALSE }, { (char*)"Class", JVMTI_KIND_IN, JVMTI_TYPE_JCLASS, JNI_FALSE } }; static jvmtiExtensionEventInfo ext_event = { EXT_EVENT_CLASS_UNLOAD, (char*)"com.sun.hotspot.events.ClassUnload", (char*)"CLASS_UNLOAD event", sizeof(event_params)/sizeof(event_params[0]), event_params }; _ext_events->append(&ext_event); } // return the list of extension functions jvmtiError JvmtiExtensions::get_functions(JvmtiEnv* env, jint* extension_count_ptr, jvmtiExtensionFunctionInfo** extensions) { guarantee(_ext_functions != NULL, "registration not done"); ResourceTracker rt(env); jvmtiExtensionFunctionInfo* ext_funcs; jvmtiError err = rt.allocate(_ext_functions->length() * sizeof(jvmtiExtensionFunctionInfo), (unsigned char**)&ext_funcs); if (err != JVMTI_ERROR_NONE) { return err; } for (int i=0; i<_ext_functions->length(); i++ ) { ext_funcs[i].func = _ext_functions->at(i)->func; char *id = _ext_functions->at(i)->id; err = rt.allocate(strlen(id)+1, (unsigned char**)&(ext_funcs[i].id)); if (err != JVMTI_ERROR_NONE) { return err; } strcpy(ext_funcs[i].id, id); char *desc = _ext_functions->at(i)->short_description; err = rt.allocate(strlen(desc)+1, (unsigned char**)&(ext_funcs[i].short_description)); if (err != JVMTI_ERROR_NONE) { return err; } strcpy(ext_funcs[i].short_description, desc); // params jint param_count = _ext_functions->at(i)->param_count; ext_funcs[i].param_count = param_count; if (param_count == 0) { ext_funcs[i].params = NULL; } else { err = rt.allocate(param_count*sizeof(jvmtiParamInfo), (unsigned char**)&(ext_funcs[i].params)); if (err != JVMTI_ERROR_NONE) { return err; } jvmtiParamInfo* src_params = _ext_functions->at(i)->params; jvmtiParamInfo* dst_params = ext_funcs[i].params; for (int j=0; j<param_count; j++) { err = rt.allocate(strlen(src_params[j].name)+1, (unsigned char**)&(dst_params[j].name)); if (err != JVMTI_ERROR_NONE) { return err; } strcpy(dst_params[j].name, src_params[j].name); dst_params[j].kind = src_params[j].kind; dst_params[j].base_type = src_params[j].base_type; dst_params[j].null_ok = src_params[j].null_ok; } } // errors jint error_count = _ext_functions->at(i)->error_count; ext_funcs[i].error_count = error_count; if (error_count == 0) { ext_funcs[i].errors = NULL; } else { err = rt.allocate(error_count*sizeof(jvmtiError), (unsigned char**)&(ext_funcs[i].errors)); if (err != JVMTI_ERROR_NONE) { return err; } memcpy(ext_funcs[i].errors, _ext_functions->at(i)->errors, error_count*sizeof(jvmtiError)); } } *extension_count_ptr = _ext_functions->length(); *extensions = ext_funcs; return JVMTI_ERROR_NONE; } // return the list of extension events jvmtiError JvmtiExtensions::get_events(JvmtiEnv* env, jint* extension_count_ptr, jvmtiExtensionEventInfo** extensions) { guarantee(_ext_events != NULL, "registration not done"); ResourceTracker rt(env); jvmtiExtensionEventInfo* ext_events; jvmtiError err = rt.allocate(_ext_events->length() * sizeof(jvmtiExtensionEventInfo), (unsigned char**)&ext_events); if (err != JVMTI_ERROR_NONE) { return err; } for (int i=0; i<_ext_events->length(); i++ ) { ext_events[i].extension_event_index = _ext_events->at(i)->extension_event_index; char *id = _ext_events->at(i)->id; err = rt.allocate(strlen(id)+1, (unsigned char**)&(ext_events[i].id)); if (err != JVMTI_ERROR_NONE) { return err; } strcpy(ext_events[i].id, id); char *desc = _ext_events->at(i)->short_description; err = rt.allocate(strlen(desc)+1, (unsigned char**)&(ext_events[i].short_description)); if (err != JVMTI_ERROR_NONE) { return err; } strcpy(ext_events[i].short_description, desc); // params jint param_count = _ext_events->at(i)->param_count; ext_events[i].param_count = param_count; if (param_count == 0) { ext_events[i].params = NULL; } else { err = rt.allocate(param_count*sizeof(jvmtiParamInfo), (unsigned char**)&(ext_events[i].params)); if (err != JVMTI_ERROR_NONE) { return err; } jvmtiParamInfo* src_params = _ext_events->at(i)->params; jvmtiParamInfo* dst_params = ext_events[i].params; for (int j=0; j<param_count; j++) { err = rt.allocate(strlen(src_params[j].name)+1, (unsigned char**)&(dst_params[j].name)); if (err != JVMTI_ERROR_NONE) { return err; } strcpy(dst_params[j].name, src_params[j].name); dst_params[j].kind = src_params[j].kind; dst_params[j].base_type = src_params[j].base_type; dst_params[j].null_ok = src_params[j].null_ok; } } } *extension_count_ptr = _ext_events->length(); *extensions = ext_events; return JVMTI_ERROR_NONE; } // set callback for an extension event and enable/disable it. jvmtiError JvmtiExtensions::set_event_callback(JvmtiEnv* env, jint extension_event_index, jvmtiExtensionEvent callback) { guarantee(_ext_events != NULL, "registration not done"); jvmtiExtensionEventInfo* event = NULL; // if there are extension events registered then validate that the // extension_event_index matches one of the registered events. if (_ext_events != NULL) { for (int i=0; i<_ext_events->length(); i++ ) { if (_ext_events->at(i)->extension_event_index == extension_event_index) { event = _ext_events->at(i); break; } } } // invalid event index if (event == NULL) { return JVMTI_ERROR_ILLEGAL_ARGUMENT; } JvmtiEventController::set_extension_event_callback(env, extension_event_index, callback); return JVMTI_ERROR_NONE; }