Mercurial > hg > truffle
view src/share/vm/interpreter/bytecodeHistogram.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 |
line wrap: on
line source
/* * Copyright (c) 1997, 2010, 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_INTERPRETER_BYTECODEHISTOGRAM_HPP #define SHARE_VM_INTERPRETER_BYTECODEHISTOGRAM_HPP #include "interpreter/bytecodes.hpp" #include "memory/allocation.hpp" // BytecodeCounter counts the number of bytecodes executed class BytecodeCounter: AllStatic { private: NOT_PRODUCT(static int _counter_value;) NOT_PRODUCT(static jlong _reset_time;) friend class TemplateInterpreterGenerator; friend class BytecodeInterpreter; public: // Initialization static void reset() PRODUCT_RETURN; // Counter info (all info since last reset) static int counter_value() PRODUCT_RETURN0 NOT_PRODUCT({ return _counter_value; }); static double elapsed_time() PRODUCT_RETURN0; // in seconds static double frequency() PRODUCT_RETURN0; // bytecodes/seconds // Counter printing static void print() PRODUCT_RETURN; }; // BytecodeHistogram collects number of executions of bytecodes class BytecodeHistogram: AllStatic { private: NOT_PRODUCT(static int _counters[Bytecodes::number_of_codes];) // a counter for each bytecode friend class TemplateInterpreterGenerator; friend class InterpreterGenerator; friend class BytecodeInterpreter; public: // Initialization static void reset() PRODUCT_RETURN; // reset counters // Profile printing static void print(float cutoff = 0.01F) PRODUCT_RETURN; // cutoff in percent }; // BytecodePairHistogram collects number of executions of bytecode pairs. // A bytecode pair is any sequence of two consequtive bytecodes. class BytecodePairHistogram: AllStatic { public: // for SparcWorks enum Constants { log2_number_of_codes = 8, // use a power of 2 for faster addressing number_of_codes = 1 << log2_number_of_codes, // must be no less than Bytecodes::number_of_codes number_of_pairs = number_of_codes * number_of_codes }; private: NOT_PRODUCT(static int _index;) // new bytecode is shifted in - used to index into _counters NOT_PRODUCT(static int _counters[number_of_pairs];) // a counter for each pair friend class TemplateInterpreterGenerator; friend class InterpreterGenerator; public: // Initialization static void reset() PRODUCT_RETURN; // reset counters // Profile printing static void print(float cutoff = 0.01F) PRODUCT_RETURN; // cutoff in percent }; #endif // SHARE_VM_INTERPRETER_BYTECODEHISTOGRAM_HPP