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annotate src/share/vm/runtime/safepoint.hpp @ 18096:ca6d25be853b jdk8u25-b13
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Reviewed-by: iklam, dholmes, mschoene
| author | jiangli |
|---|---|
| date | Tue, 12 Aug 2014 17:46:16 -0400 |
| parents | 78bbf4d43a14 |
| children | 52b4284cb496 |
| rev | line source |
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| 0 | 1 /* |
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2 * Copyright (c) 1997, 2014, 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_RUNTIME_SAFEPOINT_HPP |
| 26 #define SHARE_VM_RUNTIME_SAFEPOINT_HPP | |
| 27 | |
| 28 #include "asm/assembler.hpp" | |
| 29 #include "code/nmethod.hpp" | |
| 30 #include "memory/allocation.hpp" | |
| 31 #include "runtime/extendedPC.hpp" | |
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32 #include "runtime/mutexLocker.hpp" |
| 1972 | 33 #include "runtime/os.hpp" |
| 34 #include "utilities/ostream.hpp" | |
| 35 | |
| 0 | 36 // |
| 37 // Safepoint synchronization | |
| 38 //// | |
| 39 // The VMThread or CMS_thread uses the SafepointSynchronize::begin/end | |
| 40 // methods to enter/exit a safepoint region. The begin method will roll | |
| 41 // all JavaThreads forward to a safepoint. | |
| 42 // | |
| 43 // JavaThreads must use the ThreadSafepointState abstraction (defined in | |
| 44 // thread.hpp) to indicate that that they are at a safepoint. | |
| 45 // | |
| 46 // The Mutex/Condition variable and ObjectLocker classes calls the enter/ | |
| 47 // exit safepoint methods, when a thread is blocked/restarted. Hence, all mutex exter/ | |
| 48 // exit points *must* be at a safepoint. | |
| 49 | |
| 50 | |
| 51 class ThreadSafepointState; | |
| 52 class SnippetCache; | |
| 53 class nmethod; | |
| 54 | |
| 55 // | |
| 56 // Implements roll-forward to safepoint (safepoint synchronization) | |
| 57 // | |
| 58 class SafepointSynchronize : AllStatic { | |
| 59 public: | |
| 60 enum SynchronizeState { | |
| 61 _not_synchronized = 0, // Threads not synchronized at a safepoint | |
| 62 // Keep this value 0. See the coment in do_call_back() | |
| 63 _synchronizing = 1, // Synchronizing in progress | |
| 64 _synchronized = 2 // All Java threads are stopped at a safepoint. Only VM thread is running | |
| 65 }; | |
| 66 | |
| 67 enum SafepointingThread { | |
| 68 _null_thread = 0, | |
| 69 _vm_thread = 1, | |
| 70 _other_thread = 2 | |
| 71 }; | |
| 72 | |
| 73 enum SafepointTimeoutReason { | |
| 74 _spinning_timeout = 0, | |
| 75 _blocking_timeout = 1 | |
| 76 }; | |
| 77 | |
| 78 typedef struct { | |
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79 float _time_stamp; // record when the current safepoint occurs in seconds |
| 0 | 80 int _vmop_type; // type of VM operation triggers the safepoint |
| 81 int _nof_total_threads; // total number of Java threads | |
| 82 int _nof_initial_running_threads; // total number of initially seen running threads | |
| 83 int _nof_threads_wait_to_block; // total number of threads waiting for to block | |
| 84 bool _page_armed; // true if polling page is armed, false otherwise | |
| 85 int _nof_threads_hit_page_trap; // total number of threads hitting the page trap | |
| 86 jlong _time_to_spin; // total time in millis spent in spinning | |
| 87 jlong _time_to_wait_to_block; // total time in millis spent in waiting for to block | |
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88 jlong _time_to_do_cleanups; // total time in millis spent in performing cleanups |
| 0 | 89 jlong _time_to_sync; // total time in millis spent in getting to _synchronized |
| 90 jlong _time_to_exec_vmop; // total time in millis spent in vm operation itself | |
| 91 } SafepointStats; | |
| 92 | |
| 93 private: | |
| 94 static volatile SynchronizeState _state; // Threads might read this flag directly, without acquireing the Threads_lock | |
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95 static volatile int _waiting_to_block; // number of threads we are waiting for to block |
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96 static int _current_jni_active_count; // Counts the number of active critical natives during the safepoint |
| 0 | 97 |
| 98 // This counter is used for fast versions of jni_Get<Primitive>Field. | |
| 99 // An even value means there is no ongoing safepoint operations. | |
| 100 // The counter is incremented ONLY at the beginning and end of each | |
| 101 // safepoint. The fact that Threads_lock is held throughout each pair of | |
| 102 // increments (at the beginning and end of each safepoint) guarantees | |
| 103 // race freedom. | |
| 104 public: | |
| 105 static volatile int _safepoint_counter; | |
| 106 private: | |
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107 static long _end_of_last_safepoint; // Time of last safepoint in milliseconds |
| 0 | 108 |
| 109 // statistics | |
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110 static jlong _safepoint_begin_time; // time when safepoint begins |
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111 static SafepointStats* _safepoint_stats; // array of SafepointStats struct |
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112 static int _cur_stat_index; // current index to the above array |
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113 static julong _safepoint_reasons[]; // safepoint count for each VM op |
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114 static julong _coalesced_vmop_count; // coalesced vmop count |
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115 static jlong _max_sync_time; // maximum sync time in nanos |
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116 static jlong _max_vmop_time; // maximum vm operation time in nanos |
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117 static float _ts_of_current_safepoint; // time stamp of current safepoint in seconds |
| 0 | 118 |
| 119 static void begin_statistics(int nof_threads, int nof_running); | |
| 120 static void update_statistics_on_spin_end(); | |
| 121 static void update_statistics_on_sync_end(jlong end_time); | |
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122 static void update_statistics_on_cleanup_end(jlong end_time); |
| 0 | 123 static void end_statistics(jlong end_time); |
| 124 static void print_statistics(); | |
| 125 inline static void inc_page_trap_count() { | |
| 126 Atomic::inc(&_safepoint_stats[_cur_stat_index]._nof_threads_hit_page_trap); | |
| 127 } | |
| 128 | |
| 129 // For debug long safepoint | |
| 130 static void print_safepoint_timeout(SafepointTimeoutReason timeout_reason); | |
| 131 | |
| 132 public: | |
| 133 | |
| 134 // Main entry points | |
| 135 | |
| 136 // Roll all threads forward to safepoint. Must be called by the | |
| 137 // VMThread or CMS_thread. | |
| 138 static void begin(); | |
| 139 static void end(); // Start all suspended threads again... | |
| 140 | |
| 141 static bool safepoint_safe(JavaThread *thread, JavaThreadState state); | |
| 142 | |
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143 static void check_for_lazy_critical_native(JavaThread *thread, JavaThreadState state); |
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144 |
| 0 | 145 // Query |
| 146 inline static bool is_at_safepoint() { return _state == _synchronized; } | |
| 147 inline static bool is_synchronizing() { return _state == _synchronizing; } | |
| 148 | |
| 149 inline static bool do_call_back() { | |
| 150 return (_state != _not_synchronized); | |
| 151 } | |
| 152 | |
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153 inline static void increment_jni_active_count() { |
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154 assert_locked_or_safepoint(Safepoint_lock); |
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155 _current_jni_active_count++; |
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156 } |
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157 |
| 0 | 158 // Called when a thread volantary blocks |
| 159 static void block(JavaThread *thread); | |
| 160 static void signal_thread_at_safepoint() { _waiting_to_block--; } | |
| 161 | |
| 162 // Exception handling for page polling | |
| 163 static void handle_polling_page_exception(JavaThread *thread); | |
| 164 | |
| 165 // VM Thread interface for determining safepoint rate | |
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166 static long last_non_safepoint_interval() { |
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167 return os::javaTimeMillis() - _end_of_last_safepoint; |
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168 } |
| 1783 | 169 static long end_of_last_safepoint() { |
| 170 return _end_of_last_safepoint; | |
| 171 } | |
| 0 | 172 static bool is_cleanup_needed(); |
| 173 static void do_cleanup_tasks(); | |
| 174 | |
| 175 // debugging | |
| 176 static void print_state() PRODUCT_RETURN; | |
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177 static void safepoint_msg(const char* format, ...) ATTRIBUTE_PRINTF(1, 2) PRODUCT_RETURN; |
| 0 | 178 |
| 179 static void deferred_initialize_stat(); | |
| 180 static void print_stat_on_exit(); | |
| 181 inline static void inc_vmop_coalesced_count() { _coalesced_vmop_count++; } | |
| 182 | |
| 183 static void set_is_at_safepoint() { _state = _synchronized; } | |
| 184 static void set_is_not_at_safepoint() { _state = _not_synchronized; } | |
| 185 | |
| 186 // assembly support | |
| 187 static address address_of_state() { return (address)&_state; } | |
| 188 | |
| 189 static address safepoint_counter_addr() { return (address)&_safepoint_counter; } | |
| 190 }; | |
| 191 | |
| 192 // State class for a thread suspended at a safepoint | |
| 6197 | 193 class ThreadSafepointState: public CHeapObj<mtInternal> { |
| 0 | 194 public: |
| 195 // These states are maintained by VM thread while threads are being brought | |
| 196 // to a safepoint. After SafepointSynchronize::end(), they are reset to | |
| 197 // _running. | |
| 198 enum suspend_type { | |
| 199 _running = 0, // Thread state not yet determined (i.e., not at a safepoint yet) | |
| 200 _at_safepoint = 1, // Thread at a safepoint (f.ex., when blocked on a lock) | |
| 201 _call_back = 2 // Keep executing and wait for callback (if thread is in interpreted or vm) | |
| 202 }; | |
| 203 private: | |
| 204 volatile bool _at_poll_safepoint; // At polling page safepoint (NOT a poll return safepoint) | |
| 205 // Thread has called back the safepoint code (for debugging) | |
| 206 bool _has_called_back; | |
| 207 | |
| 208 JavaThread * _thread; | |
| 209 volatile suspend_type _type; | |
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210 JavaThreadState _orig_thread_state; |
| 0 | 211 |
| 212 | |
| 213 public: | |
| 214 ThreadSafepointState(JavaThread *thread); | |
| 215 | |
| 216 // examine/roll-forward/restart | |
| 217 void examine_state_of_thread(); | |
| 218 void roll_forward(suspend_type type); | |
| 219 void restart(); | |
| 220 | |
| 221 // Query | |
| 222 JavaThread* thread() const { return _thread; } | |
| 223 suspend_type type() const { return _type; } | |
| 224 bool is_running() const { return (_type==_running); } | |
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225 JavaThreadState orig_thread_state() const { return _orig_thread_state; } |
| 0 | 226 |
| 227 // Support for safepoint timeout (debugging) | |
| 228 bool has_called_back() const { return _has_called_back; } | |
| 229 void set_has_called_back(bool val) { _has_called_back = val; } | |
| 230 bool is_at_poll_safepoint() { return _at_poll_safepoint; } | |
| 231 void set_at_poll_safepoint(bool val) { _at_poll_safepoint = val; } | |
| 232 | |
| 233 void handle_polling_page_exception(); | |
| 234 | |
| 235 // debugging | |
| 236 void print_on(outputStream* st) const; | |
| 237 void print() const { print_on(tty); } | |
| 238 | |
| 239 // Initialize | |
| 240 static void create(JavaThread *thread); | |
| 241 static void destroy(JavaThread *thread); | |
| 242 | |
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243 void safepoint_msg(const char* format, ...) ATTRIBUTE_PRINTF(2, 3) { |
| 0 | 244 if (ShowSafepointMsgs) { |
| 245 va_list ap; | |
| 246 va_start(ap, format); | |
| 247 tty->vprint_cr(format, ap); | |
| 248 va_end(ap); | |
| 249 } | |
| 250 } | |
| 251 }; | |
| 252 | |
| 1783 | 253 |
| 1972 | 254 |
| 255 #endif // SHARE_VM_RUNTIME_SAFEPOINT_HPP |