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annotate src/share/vm/runtime/perfMemory.cpp @ 4597:8bc6f680a88d
fixed visual studio project files
author | Christian Haeubl <christian.haeubl@oracle.com> |
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date | Tue, 14 Feb 2012 15:01:36 -0800 |
parents | f95d63e2154a |
children | d2a62e0f25eb |
rev | line source |
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0 | 1 /* |
1972 | 2 * Copyright (c) 2001, 2010, 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 * | |
1552
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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 #include "precompiled.hpp" |
26 #include "memory/allocation.inline.hpp" | |
27 #include "runtime/arguments.hpp" | |
28 #include "runtime/java.hpp" | |
29 #include "runtime/mutex.hpp" | |
30 #include "runtime/mutexLocker.hpp" | |
31 #include "runtime/os.hpp" | |
32 #include "runtime/perfData.hpp" | |
33 #include "runtime/perfMemory.hpp" | |
34 #include "runtime/statSampler.hpp" | |
35 #include "utilities/globalDefinitions.hpp" | |
0 | 36 |
434 | 37 // Prefix of performance data file. |
38 const char PERFDATA_NAME[] = "hsperfdata"; | |
39 | |
40 // Add 1 for the '_' character between PERFDATA_NAME and pid. The '\0' terminating | |
41 // character will be included in the sizeof(PERFDATA_NAME) operation. | |
42 static const size_t PERFDATA_FILENAME_LEN = sizeof(PERFDATA_NAME) + | |
43 UINT_CHARS + 1; | |
44 | |
0 | 45 char* PerfMemory::_start = NULL; |
46 char* PerfMemory::_end = NULL; | |
47 char* PerfMemory::_top = NULL; | |
48 size_t PerfMemory::_capacity = 0; | |
49 jint PerfMemory::_initialized = false; | |
50 PerfDataPrologue* PerfMemory::_prologue = NULL; | |
51 | |
52 void perfMemory_init() { | |
53 | |
54 if (!UsePerfData) return; | |
55 | |
56 PerfMemory::initialize(); | |
57 } | |
58 | |
59 void perfMemory_exit() { | |
60 | |
61 if (!UsePerfData) return; | |
62 if (!PerfMemory::is_initialized()) return; | |
63 | |
64 // if the StatSampler is active, then we don't want to remove | |
65 // resources it may be dependent on. Typically, the StatSampler | |
66 // is disengaged from the watcher thread when this method is called, | |
67 // but it is not disengaged if this method is invoked during a | |
68 // VM abort. | |
69 // | |
70 if (!StatSampler::is_active()) | |
71 PerfDataManager::destroy(); | |
72 | |
73 // remove the persistent external resources, if any. this method | |
74 // does not unmap or invalidate any virtual memory allocated during | |
75 // initialization. | |
76 // | |
77 PerfMemory::destroy(); | |
78 } | |
79 | |
80 void PerfMemory::initialize() { | |
81 | |
82 if (_prologue != NULL) | |
83 // initialization already performed | |
84 return; | |
85 | |
86 size_t capacity = align_size_up(PerfDataMemorySize, | |
87 os::vm_allocation_granularity()); | |
88 | |
89 if (PerfTraceMemOps) { | |
90 tty->print("PerfDataMemorySize = " SIZE_FORMAT "," | |
91 " os::vm_allocation_granularity = " SIZE_FORMAT "," | |
92 " adjusted size = " SIZE_FORMAT "\n", | |
93 PerfDataMemorySize, | |
94 os::vm_allocation_granularity(), | |
95 capacity); | |
96 } | |
97 | |
98 // allocate PerfData memory region | |
99 create_memory_region(capacity); | |
100 | |
101 if (_start == NULL) { | |
102 | |
103 // the PerfMemory region could not be created as desired. Rather | |
104 // than terminating the JVM, we revert to creating the instrumentation | |
105 // on the C heap. When running in this mode, external monitoring | |
106 // clients cannot attach to and monitor this JVM. | |
107 // | |
108 // the warning is issued only in debug mode in order to avoid | |
109 // additional output to the stdout or stderr output streams. | |
110 // | |
111 if (PrintMiscellaneous && Verbose) { | |
112 warning("Could not create PerfData Memory region, reverting to malloc"); | |
113 } | |
114 | |
115 _prologue = NEW_C_HEAP_OBJ(PerfDataPrologue); | |
116 } | |
117 else { | |
118 | |
119 // the PerfMemory region was created as expected. | |
120 | |
121 if (PerfTraceMemOps) { | |
122 tty->print("PerfMemory created: address = " INTPTR_FORMAT "," | |
123 " size = " SIZE_FORMAT "\n", | |
124 (void*)_start, | |
125 _capacity); | |
126 } | |
127 | |
128 _prologue = (PerfDataPrologue *)_start; | |
129 _end = _start + _capacity; | |
130 _top = _start + sizeof(PerfDataPrologue); | |
131 } | |
132 | |
133 assert(_prologue != NULL, "prologue pointer must be initialized"); | |
134 | |
135 #ifdef VM_LITTLE_ENDIAN | |
136 _prologue->magic = (jint)0xc0c0feca; | |
137 _prologue->byte_order = PERFDATA_LITTLE_ENDIAN; | |
138 #else | |
139 _prologue->magic = (jint)0xcafec0c0; | |
140 _prologue->byte_order = PERFDATA_BIG_ENDIAN; | |
141 #endif | |
142 | |
143 _prologue->major_version = PERFDATA_MAJOR_VERSION; | |
144 _prologue->minor_version = PERFDATA_MINOR_VERSION; | |
145 _prologue->accessible = 0; | |
146 | |
147 _prologue->entry_offset = sizeof(PerfDataPrologue); | |
148 _prologue->num_entries = 0; | |
149 _prologue->used = 0; | |
150 _prologue->overflow = 0; | |
151 _prologue->mod_time_stamp = 0; | |
152 | |
153 OrderAccess::release_store(&_initialized, 1); | |
154 } | |
155 | |
156 void PerfMemory::destroy() { | |
157 | |
158 assert(_prologue != NULL, "prologue pointer must be initialized"); | |
159 | |
160 if (_start != NULL && _prologue->overflow != 0) { | |
161 | |
162 // This state indicates that the contiguous memory region exists and | |
163 // that it wasn't large enough to hold all the counters. In this case, | |
164 // we output a warning message to the user on exit if the -XX:+Verbose | |
165 // flag is set (a debug only flag). External monitoring tools can detect | |
166 // this condition by monitoring the _prologue->overflow word. | |
167 // | |
168 // There are two tunables that can help resolve this issue: | |
169 // - increase the size of the PerfMemory with -XX:PerfDataMemorySize=<n> | |
170 // - decrease the maximum string constant length with | |
171 // -XX:PerfMaxStringConstLength=<n> | |
172 // | |
173 if (PrintMiscellaneous && Verbose) { | |
174 warning("PerfMemory Overflow Occurred.\n" | |
175 "\tCapacity = " SIZE_FORMAT " bytes" | |
176 " Used = " SIZE_FORMAT " bytes" | |
177 " Overflow = " INT32_FORMAT " bytes" | |
178 "\n\tUse -XX:PerfDataMemorySize=<size> to specify larger size.", | |
179 PerfMemory::capacity(), | |
180 PerfMemory::used(), | |
181 _prologue->overflow); | |
182 } | |
183 } | |
184 | |
185 if (_start != NULL) { | |
186 | |
187 // this state indicates that the contiguous memory region was successfully | |
188 // and that persistent resources may need to be cleaned up. This is | |
189 // expected to be the typical condition. | |
190 // | |
191 delete_memory_region(); | |
192 } | |
193 | |
194 _start = NULL; | |
195 _end = NULL; | |
196 _top = NULL; | |
197 _prologue = NULL; | |
198 _capacity = 0; | |
199 } | |
200 | |
201 // allocate an aligned block of memory from the PerfData memory | |
202 // region. This method assumes that the PerfData memory region | |
203 // was aligned on a double word boundary when created. | |
204 // | |
205 char* PerfMemory::alloc(size_t size) { | |
206 | |
207 if (!UsePerfData) return NULL; | |
208 | |
209 MutexLocker ml(PerfDataMemAlloc_lock); | |
210 | |
211 assert(_prologue != NULL, "called before initialization"); | |
212 | |
213 // check that there is enough memory for this request | |
214 if ((_top + size) >= _end) { | |
215 | |
216 _prologue->overflow += (jint)size; | |
217 | |
218 return NULL; | |
219 } | |
220 | |
221 char* result = _top; | |
222 | |
223 _top += size; | |
224 | |
225 assert(contains(result), "PerfData memory pointer out of range"); | |
226 | |
227 _prologue->used = (jint)used(); | |
228 _prologue->num_entries = _prologue->num_entries + 1; | |
229 | |
230 return result; | |
231 } | |
232 | |
233 void PerfMemory::mark_updated() { | |
234 if (!UsePerfData) return; | |
235 | |
236 _prologue->mod_time_stamp = os::elapsed_counter(); | |
237 } | |
238 | |
239 // Returns the complete path including the file name of performance data file. | |
240 // Caller is expected to release the allocated memory. | |
241 char* PerfMemory::get_perfdata_file_path() { | |
242 char* dest_file = NULL; | |
243 | |
244 if (PerfDataSaveFile != NULL) { | |
245 // dest_file_name stores the validated file name if file_name | |
246 // contains %p which will be replaced by pid. | |
247 dest_file = NEW_C_HEAP_ARRAY(char, JVM_MAXPATHLEN); | |
248 if(!Arguments::copy_expand_pid(PerfDataSaveFile, strlen(PerfDataSaveFile), | |
249 dest_file, JVM_MAXPATHLEN)) { | |
250 FREE_C_HEAP_ARRAY(char, dest_file); | |
251 if (PrintMiscellaneous && Verbose) { | |
252 warning("Invalid performance data file path name specified, "\ | |
253 "fall back to a default name"); | |
254 } | |
255 } else { | |
256 return dest_file; | |
257 } | |
258 } | |
259 // create the name of the file for retaining the instrumentation memory. | |
260 dest_file = NEW_C_HEAP_ARRAY(char, PERFDATA_FILENAME_LEN); | |
261 jio_snprintf(dest_file, PERFDATA_FILENAME_LEN, | |
262 "%s_%d", PERFDATA_NAME, os::current_process_id()); | |
263 | |
264 return dest_file; | |
265 } |