Mercurial > hg > graal-compiler
annotate src/share/vm/utilities/histogram.hpp @ 1711:a6bff45449bc
6973570: OrderAccess::storestore() scales poorly on multi-socket x64 and sparc: cache-line ping-ponging
Summary: volatile store to static variable removed in favour of a volatile store to stack to avoid excessive cache coherency traffic; verified that the volatile store is not elided by any of our current compilers.
Reviewed-by: dholmes, dice, jcoomes, kvn
author | ysr |
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date | Tue, 10 Aug 2010 14:53:35 -0700 |
parents | c18cbe5936b8 |
children | f95d63e2154a |
rev | line source |
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0 | 1 /* |
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6941466: Oracle rebranding changes for Hotspot repositories
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2 * Copyright (c) 1998, 2000, 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 |
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
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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 | |
25 // This class provides a framework for collecting various statistics. | |
26 // The current implementation is oriented towards counting invocations | |
27 // of various types, but that can be easily changed. | |
28 // | |
29 // To use it, you need to declare a Histogram*, and a subtype of | |
30 // HistogramElement: | |
31 // | |
32 // HistogramElement* MyHistogram; | |
33 // | |
34 // class MyHistogramElement : public HistogramElement { | |
35 // public: | |
36 // MyHistogramElement(char* name); | |
37 // }; | |
38 // | |
39 // MyHistogramElement::MyHistogramElement(char* elementName) { | |
40 // _name = elementName; | |
41 // | |
42 // if(MyHistogram == NULL) | |
43 // MyHistogram = new Histogram("My Call Counts",100); | |
44 // | |
45 // MyHistogram->add_element(this); | |
46 // } | |
47 // | |
48 // #define MyCountWrapper(arg) static MyHistogramElement* e = new MyHistogramElement(arg); e->increment_count() | |
49 // | |
50 // This gives you a simple way to count invocations of specfic functions: | |
51 // | |
52 // void a_function_that_is_being_counted() { | |
53 // MyCountWrapper("FunctionName"); | |
54 // ... | |
55 // } | |
56 // | |
57 // To print the results, invoke print() on your Histogram*. | |
58 | |
59 #ifdef ASSERT | |
60 | |
61 class HistogramElement : public CHeapObj { | |
62 protected: | |
63 jint _count; | |
64 const char* _name; | |
65 | |
66 public: | |
67 HistogramElement(); | |
68 virtual int count(); | |
69 virtual const char* name(); | |
70 virtual void increment_count(); | |
71 void print_on(outputStream* st) const; | |
72 virtual int compare(HistogramElement* e1,HistogramElement* e2); | |
73 }; | |
74 | |
75 class Histogram : public CHeapObj { | |
76 protected: | |
77 GrowableArray<HistogramElement*>* _elements; | |
78 GrowableArray<HistogramElement*>* elements() { return _elements; } | |
79 const char* _title; | |
80 const char* title() { return _title; } | |
81 static int sort_helper(HistogramElement** e1,HistogramElement** e2); | |
82 virtual void print_header(outputStream* st); | |
83 virtual void print_elements(outputStream* st); | |
84 | |
85 public: | |
86 Histogram(const char* title,int estimatedSize); | |
87 virtual void add_element(HistogramElement* element); | |
88 void print_on(outputStream* st) const; | |
89 }; | |
90 | |
91 #endif |