Mercurial > hg > truffle
annotate src/share/vm/utilities/histogram.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 | bdd155477289 |
| children | 4ca6dc0799b6 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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7197424: update copyright year to match last edit in jdk8 hotspot repository
mikael
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2 * Copyright (c) 1998, 2012, 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_UTILITIES_HISTOGRAM_HPP |
| 26 #define SHARE_VM_UTILITIES_HISTOGRAM_HPP | |
| 27 | |
| 28 #include "memory/allocation.hpp" | |
| 29 #include "runtime/os.hpp" | |
| 30 #include "utilities/growableArray.hpp" | |
| 31 #ifdef TARGET_OS_FAMILY_linux | |
| 32 # include "os_linux.inline.hpp" | |
| 33 #endif | |
| 34 #ifdef TARGET_OS_FAMILY_solaris | |
| 35 # include "os_solaris.inline.hpp" | |
| 36 #endif | |
| 37 #ifdef TARGET_OS_FAMILY_windows | |
| 38 # include "os_windows.inline.hpp" | |
| 39 #endif | |
| 14411 | 40 #ifdef TARGET_OS_FAMILY_aix |
| 41 # include "os_aix.inline.hpp" | |
| 42 #endif | |
| 3960 | 43 #ifdef TARGET_OS_FAMILY_bsd |
| 44 # include "os_bsd.inline.hpp" | |
| 45 #endif | |
| 1972 | 46 |
| 0 | 47 // This class provides a framework for collecting various statistics. |
| 48 // The current implementation is oriented towards counting invocations | |
| 49 // of various types, but that can be easily changed. | |
| 50 // | |
| 51 // To use it, you need to declare a Histogram*, and a subtype of | |
| 52 // HistogramElement: | |
| 53 // | |
| 54 // HistogramElement* MyHistogram; | |
| 55 // | |
| 56 // class MyHistogramElement : public HistogramElement { | |
| 57 // public: | |
| 58 // MyHistogramElement(char* name); | |
| 59 // }; | |
| 60 // | |
| 61 // MyHistogramElement::MyHistogramElement(char* elementName) { | |
| 62 // _name = elementName; | |
| 63 // | |
| 64 // if(MyHistogram == NULL) | |
| 65 // MyHistogram = new Histogram("My Call Counts",100); | |
| 66 // | |
| 67 // MyHistogram->add_element(this); | |
| 68 // } | |
| 69 // | |
| 70 // #define MyCountWrapper(arg) static MyHistogramElement* e = new MyHistogramElement(arg); e->increment_count() | |
| 71 // | |
| 72 // This gives you a simple way to count invocations of specfic functions: | |
| 73 // | |
| 74 // void a_function_that_is_being_counted() { | |
| 75 // MyCountWrapper("FunctionName"); | |
| 76 // ... | |
| 77 // } | |
| 78 // | |
| 79 // To print the results, invoke print() on your Histogram*. | |
| 80 | |
| 81 #ifdef ASSERT | |
| 82 | |
| 6197 | 83 class HistogramElement : public CHeapObj<mtInternal> { |
| 0 | 84 protected: |
| 85 jint _count; | |
| 86 const char* _name; | |
| 87 | |
| 88 public: | |
| 89 HistogramElement(); | |
| 90 virtual int count(); | |
| 91 virtual const char* name(); | |
| 92 virtual void increment_count(); | |
| 93 void print_on(outputStream* st) const; | |
| 94 virtual int compare(HistogramElement* e1,HistogramElement* e2); | |
| 95 }; | |
| 96 | |
| 6197 | 97 class Histogram : public CHeapObj<mtInternal> { |
| 0 | 98 protected: |
| 99 GrowableArray<HistogramElement*>* _elements; | |
| 100 GrowableArray<HistogramElement*>* elements() { return _elements; } | |
| 101 const char* _title; | |
| 102 const char* title() { return _title; } | |
| 103 static int sort_helper(HistogramElement** e1,HistogramElement** e2); | |
| 104 virtual void print_header(outputStream* st); | |
| 105 virtual void print_elements(outputStream* st); | |
| 106 | |
| 107 public: | |
| 108 Histogram(const char* title,int estimatedSize); | |
| 109 virtual void add_element(HistogramElement* element); | |
| 110 void print_on(outputStream* st) const; | |
| 111 }; | |
| 112 | |
| 113 #endif | |
| 1972 | 114 |
| 115 #endif // SHARE_VM_UTILITIES_HISTOGRAM_HPP |