Mercurial > hg > graal-jvmci-8
annotate src/share/vm/runtime/perfMemory.hpp @ 1640:bfc89697cccb
6964164: MonitorInUseLists leak of contended objects
Summary: fix MonitorInUseLists memory leak and MonitorBound now works
Reviewed-by: chrisphi, dice
author | acorn |
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date | Fri, 02 Jul 2010 17:23:43 -0400 |
parents | c18cbe5936b8 |
children | f95d63e2154a |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2001, 2008, Oracle and/or its affiliates. All rights reserved. |
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12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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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 /* | |
26 * PerfData Version Constants | |
27 * - Major Version - change whenever the structure of PerfDataEntry changes | |
28 * - Minor Version - change whenever the data within the PerfDataEntry | |
29 * structure changes. for example, new unit or variability | |
30 * values are added or new PerfData subtypes are added. | |
31 */ | |
32 #define PERFDATA_MAJOR_VERSION 2 | |
33 #define PERFDATA_MINOR_VERSION 0 | |
34 | |
35 /* Byte order of the PerfData memory region. The byte order is exposed in | |
36 * the PerfData memory region as the data in the memory region may have | |
37 * been generated by a little endian JVM implementation. Tracking the byte | |
38 * order in the PerfData memory region allows Java applications to adapt | |
39 * to the native byte order for monitoring purposes. This indicator is | |
40 * also useful when a snapshot of the PerfData memory region is shipped | |
41 * to a machine with a native byte order different from that of the | |
42 * originating machine. | |
43 */ | |
44 #define PERFDATA_BIG_ENDIAN 0 | |
45 #define PERFDATA_LITTLE_ENDIAN 1 | |
46 | |
47 /* | |
48 * The PerfDataPrologue structure is known by the PerfDataBuffer Java class | |
49 * libraries that read the PerfData memory region. The size and the position | |
50 * of the fields must be changed along with their counterparts in the | |
51 * PerfDataBuffer Java class. The first four bytes of this structure | |
52 * should never change, or compatibility problems between the monitoring | |
53 * applications and Hotspot VMs will result. The reserved fields are | |
54 * available for future enhancements. | |
55 */ | |
56 typedef struct { | |
57 jint magic; // magic number - 0xcafec0c0 | |
58 jbyte byte_order; // byte order of the buffer | |
59 jbyte major_version; // major and minor version numbers | |
60 jbyte minor_version; | |
61 jbyte accessible; // ready to access | |
62 jint used; // number of PerfData memory bytes used | |
63 jint overflow; // number of bytes of overflow | |
64 jlong mod_time_stamp; // time stamp of last structural modification | |
65 jint entry_offset; // offset of the first PerfDataEntry | |
66 jint num_entries; // number of allocated PerfData entries | |
67 } PerfDataPrologue; | |
68 | |
69 /* The PerfDataEntry structure defines the fixed portion of an entry | |
70 * in the PerfData memory region. The PerfDataBuffer Java libraries | |
71 * are aware of this structure and need to be changed when this | |
72 * structure changes. | |
73 */ | |
74 typedef struct { | |
75 | |
76 jint entry_length; // entry length in bytes | |
77 jint name_offset; // offset of the data item name | |
78 jint vector_length; // length of the vector. If 0, then scalar | |
79 jbyte data_type; // type of the data item - | |
80 // 'B','Z','J','I','S','C','D','F','V','L','[' | |
81 jbyte flags; // flags indicating misc attributes | |
82 jbyte data_units; // unit of measure for the data type | |
83 jbyte data_variability; // variability classification of data type | |
84 jint data_offset; // offset of the data item | |
85 | |
86 /* | |
87 body of PerfData memory entry is variable length | |
88 | |
89 jbyte[name_length] data_name; // name of the data item | |
90 jbyte[pad_length] data_pad; // alignment of data item | |
91 j<data_type>[data_length] data_item; // array of appropriate types. | |
92 // data_length is > 1 only when the | |
93 // data_type is T_ARRAY. | |
94 */ | |
95 } PerfDataEntry; | |
96 | |
97 // Prefix of performance data file. | |
434 | 98 extern const char PERFDATA_NAME[]; |
0 | 99 |
100 // UINT_CHARS contains the number of characters holding a process id | |
101 // (i.e. pid). pid is defined as unsigned "int" so the maximum possible pid value | |
102 // would be 2^32 - 1 (4294967295) which can be represented as a 10 characters | |
103 // string. | |
104 static const size_t UINT_CHARS = 10; | |
105 | |
106 /* the PerfMemory class manages creation, destruction, | |
107 * and allocation of the PerfData region. | |
108 */ | |
109 class PerfMemory : AllStatic { | |
110 friend class VMStructs; | |
111 private: | |
112 static char* _start; | |
113 static char* _end; | |
114 static char* _top; | |
115 static size_t _capacity; | |
116 static PerfDataPrologue* _prologue; | |
117 static jint _initialized; | |
118 | |
119 static void create_memory_region(size_t sizep); | |
120 static void delete_memory_region(); | |
121 | |
122 public: | |
123 enum PerfMemoryMode { | |
124 PERF_MODE_RO = 0, | |
125 PERF_MODE_RW = 1 | |
126 }; | |
127 | |
128 static char* alloc(size_t size); | |
129 static char* start() { return _start; } | |
130 static char* end() { return _end; } | |
131 static size_t used() { return (size_t) (_top - _start); } | |
132 static size_t capacity() { return _capacity; } | |
133 static bool is_initialized() { return _initialized != 0; } | |
134 static bool contains(char* addr) { | |
135 return ((_start != NULL) && (addr >= _start) && (addr < _end)); | |
136 } | |
137 static void mark_updated(); | |
138 | |
139 // methods for attaching to and detaching from the PerfData | |
140 // memory segment of another JVM process on the same system. | |
141 static void attach(const char* user, int vmid, PerfMemoryMode mode, | |
142 char** addrp, size_t* size, TRAPS); | |
143 static void detach(char* addr, size_t bytes, TRAPS); | |
144 | |
145 static void initialize(); | |
146 static void destroy(); | |
147 static void set_accessible(bool value) { | |
148 if (UsePerfData) { | |
149 _prologue->accessible = value; | |
150 } | |
151 } | |
152 | |
153 // filename of backing store or NULL if none. | |
154 static char* backing_store_filename(); | |
155 | |
156 // returns the complete file path of hsperfdata. | |
157 // the caller is expected to free the allocated memory. | |
158 static char* get_perfdata_file_path(); | |
159 }; | |
160 | |
161 void perfMemory_init(); | |
162 void perfMemory_exit(); |