Mercurial > hg > truffle
view src/share/vm/runtime/dtraceJSDT.hpp @ 10246:194f52aa2f23
7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
Summary: Refactor G1's hot card cache and card counts table into their own files. Simplify the card counts table, including removing the encoding of the card index in each entry. The card counts table now has a 1:1 correspondence with the cards spanned by heap. Space for the card counts table is reserved from virtual memory (rather than C heap) during JVM startup and is committed/expanded when the heap is expanded. Changes were also reviewed-by Vitaly Davidovich.
Reviewed-by: tschatzl, jmasa
author | johnc |
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date | Thu, 09 May 2013 11:16:39 -0700 |
parents | b9a9ed0f8eeb |
children |
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/* * Copyright (c) 1997, 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. * */ #ifndef SHARE_VM_RUNTIME_DTRACEJSDT_HPP #define SHARE_VM_RUNTIME_DTRACEJSDT_HPP #include "code/nmethod.hpp" #ifdef TARGET_ARCH_x86 # include "nativeInst_x86.hpp" #endif #ifdef TARGET_ARCH_sparc # include "nativeInst_sparc.hpp" #endif #ifdef TARGET_ARCH_zero # include "nativeInst_zero.hpp" #endif #ifdef TARGET_ARCH_arm # include "nativeInst_arm.hpp" #endif #ifdef TARGET_ARCH_ppc # include "nativeInst_ppc.hpp" #endif class RegisteredProbes; typedef jlong OpaqueProbes; class DTraceJSDT : AllStatic { private: static int pd_activate(void* moduleBaseAddress, jstring module, jint providers_count, JVM_DTraceProvider* providers); static void pd_dispose(int handle); static jboolean pd_is_supported(); public: static OpaqueProbes activate( jint version, jstring module_name, jint providers_count, JVM_DTraceProvider* providers, TRAPS); static jboolean is_probe_enabled(jmethodID method); static void dispose(OpaqueProbes handle); static jboolean is_supported(); }; class RegisteredProbes : public CHeapObj<mtInternal> { private: nmethod** _nmethods; // all the probe methods size_t _count; // number of probe methods int _helper_handle; // DTrace-assigned identifier public: RegisteredProbes(size_t count) { _count = count; _nmethods = NEW_C_HEAP_ARRAY(nmethod*, count, mtInternal); } ~RegisteredProbes() { for (size_t i = 0; i < _count; ++i) { // Let the sweeper reclaim it _nmethods[i]->make_not_entrant(); _nmethods[i]->method()->clear_code(); } FREE_C_HEAP_ARRAY(nmethod*, _nmethods, mtInternal); _nmethods = NULL; _count = 0; } static RegisteredProbes* toRegisteredProbes(OpaqueProbes p) { return (RegisteredProbes*)(intptr_t)p; } static OpaqueProbes toOpaqueProbes(RegisteredProbes* p) { return (OpaqueProbes)(intptr_t)p; } void set_helper_handle(int handle) { _helper_handle = handle; } int helper_handle() const { return _helper_handle; } nmethod* nmethod_at(size_t i) { assert(i >= 0 && i < _count, "bad nmethod index"); return _nmethods[i]; } void nmethod_at_put(size_t i, nmethod* nm) { assert(i >= 0 && i < _count, "bad nmethod index"); _nmethods[i] = nm; } }; #endif // SHARE_VM_RUNTIME_DTRACEJSDT_HPP