Mercurial > hg > graal-compiler
annotate src/share/vm/runtime/safepoint.hpp @ 1366:b9d85fcdf743
6940733: allocate non static oop fields in super and sub classes together
Summary: Use FieldsAllocationStyle=2 to allocate non static oop fields in super and sub classes together
Reviewed-by: twisti
| author | kvn |
|---|---|
| date | Wed, 07 Apr 2010 10:35:56 -0700 |
| parents | 4b0f2f4918ed |
| children | c18cbe5936b8 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 * Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved. | |
| 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 * | |
| 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 // | |
| 26 // Safepoint synchronization | |
| 27 //// | |
| 28 // The VMThread or CMS_thread uses the SafepointSynchronize::begin/end | |
| 29 // methods to enter/exit a safepoint region. The begin method will roll | |
| 30 // all JavaThreads forward to a safepoint. | |
| 31 // | |
| 32 // JavaThreads must use the ThreadSafepointState abstraction (defined in | |
| 33 // thread.hpp) to indicate that that they are at a safepoint. | |
| 34 // | |
| 35 // The Mutex/Condition variable and ObjectLocker classes calls the enter/ | |
| 36 // exit safepoint methods, when a thread is blocked/restarted. Hence, all mutex exter/ | |
| 37 // exit points *must* be at a safepoint. | |
| 38 | |
| 39 | |
| 40 class ThreadSafepointState; | |
| 41 class SnippetCache; | |
| 42 class nmethod; | |
| 43 | |
| 44 // | |
| 45 // Implements roll-forward to safepoint (safepoint synchronization) | |
| 46 // | |
| 47 class SafepointSynchronize : AllStatic { | |
| 48 public: | |
| 49 enum SynchronizeState { | |
| 50 _not_synchronized = 0, // Threads not synchronized at a safepoint | |
| 51 // Keep this value 0. See the coment in do_call_back() | |
| 52 _synchronizing = 1, // Synchronizing in progress | |
| 53 _synchronized = 2 // All Java threads are stopped at a safepoint. Only VM thread is running | |
| 54 }; | |
| 55 | |
| 56 enum SafepointingThread { | |
| 57 _null_thread = 0, | |
| 58 _vm_thread = 1, | |
| 59 _other_thread = 2 | |
| 60 }; | |
| 61 | |
| 62 enum SafepointTimeoutReason { | |
| 63 _spinning_timeout = 0, | |
| 64 _blocking_timeout = 1 | |
| 65 }; | |
| 66 | |
| 67 typedef struct { | |
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68 float _time_stamp; // record when the current safepoint occurs in seconds |
| 0 | 69 int _vmop_type; // type of VM operation triggers the safepoint |
| 70 int _nof_total_threads; // total number of Java threads | |
| 71 int _nof_initial_running_threads; // total number of initially seen running threads | |
| 72 int _nof_threads_wait_to_block; // total number of threads waiting for to block | |
| 73 bool _page_armed; // true if polling page is armed, false otherwise | |
| 74 int _nof_threads_hit_page_trap; // total number of threads hitting the page trap | |
| 75 jlong _time_to_spin; // total time in millis spent in spinning | |
| 76 jlong _time_to_wait_to_block; // total time in millis spent in waiting for to block | |
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77 jlong _time_to_do_cleanups; // total time in millis spent in performing cleanups |
| 0 | 78 jlong _time_to_sync; // total time in millis spent in getting to _synchronized |
| 79 jlong _time_to_exec_vmop; // total time in millis spent in vm operation itself | |
| 80 } SafepointStats; | |
| 81 | |
| 82 private: | |
| 83 static volatile SynchronizeState _state; // Threads might read this flag directly, without acquireing the Threads_lock | |
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84 static volatile int _waiting_to_block; // number of threads we are waiting for to block |
| 0 | 85 |
| 86 // This counter is used for fast versions of jni_Get<Primitive>Field. | |
| 87 // An even value means there is no ongoing safepoint operations. | |
| 88 // The counter is incremented ONLY at the beginning and end of each | |
| 89 // safepoint. The fact that Threads_lock is held throughout each pair of | |
| 90 // increments (at the beginning and end of each safepoint) guarantees | |
| 91 // race freedom. | |
| 92 public: | |
| 93 static volatile int _safepoint_counter; | |
| 94 private: | |
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95 static long _end_of_last_safepoint; // Time of last safepoint in milliseconds |
| 0 | 96 |
| 97 // statistics | |
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98 static jlong _safepoint_begin_time; // time when safepoint begins |
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99 static SafepointStats* _safepoint_stats; // array of SafepointStats struct |
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100 static int _cur_stat_index; // current index to the above array |
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101 static julong _safepoint_reasons[]; // safepoint count for each VM op |
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102 static julong _coalesced_vmop_count; // coalesced vmop count |
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103 static jlong _max_sync_time; // maximum sync time in nanos |
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104 static jlong _max_vmop_time; // maximum vm operation time in nanos |
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105 static float _ts_of_current_safepoint; // time stamp of current safepoint in seconds |
| 0 | 106 |
| 107 static void begin_statistics(int nof_threads, int nof_running); | |
| 108 static void update_statistics_on_spin_end(); | |
| 109 static void update_statistics_on_sync_end(jlong end_time); | |
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110 static void update_statistics_on_cleanup_end(jlong end_time); |
| 0 | 111 static void end_statistics(jlong end_time); |
| 112 static void print_statistics(); | |
| 113 inline static void inc_page_trap_count() { | |
| 114 Atomic::inc(&_safepoint_stats[_cur_stat_index]._nof_threads_hit_page_trap); | |
| 115 } | |
| 116 | |
| 117 // For debug long safepoint | |
| 118 static void print_safepoint_timeout(SafepointTimeoutReason timeout_reason); | |
| 119 | |
| 120 public: | |
| 121 | |
| 122 // Main entry points | |
| 123 | |
| 124 // Roll all threads forward to safepoint. Must be called by the | |
| 125 // VMThread or CMS_thread. | |
| 126 static void begin(); | |
| 127 static void end(); // Start all suspended threads again... | |
| 128 | |
| 129 static bool safepoint_safe(JavaThread *thread, JavaThreadState state); | |
| 130 | |
| 131 // Query | |
| 132 inline static bool is_at_safepoint() { return _state == _synchronized; } | |
| 133 inline static bool is_synchronizing() { return _state == _synchronizing; } | |
| 134 | |
| 135 inline static bool do_call_back() { | |
| 136 return (_state != _not_synchronized); | |
| 137 } | |
| 138 | |
| 139 // Called when a thread volantary blocks | |
| 140 static void block(JavaThread *thread); | |
| 141 static void signal_thread_at_safepoint() { _waiting_to_block--; } | |
| 142 | |
| 143 // Exception handling for page polling | |
| 144 static void handle_polling_page_exception(JavaThread *thread); | |
| 145 | |
| 146 // VM Thread interface for determining safepoint rate | |
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147 static long last_non_safepoint_interval() { |
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148 return os::javaTimeMillis() - _end_of_last_safepoint; |
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149 } |
| 0 | 150 static bool is_cleanup_needed(); |
| 151 static void do_cleanup_tasks(); | |
| 152 | |
| 153 // debugging | |
| 154 static void print_state() PRODUCT_RETURN; | |
| 155 static void safepoint_msg(const char* format, ...) PRODUCT_RETURN; | |
| 156 | |
| 157 static void deferred_initialize_stat(); | |
| 158 static void print_stat_on_exit(); | |
| 159 inline static void inc_vmop_coalesced_count() { _coalesced_vmop_count++; } | |
| 160 | |
| 161 static void set_is_at_safepoint() { _state = _synchronized; } | |
| 162 static void set_is_not_at_safepoint() { _state = _not_synchronized; } | |
| 163 | |
| 164 // assembly support | |
| 165 static address address_of_state() { return (address)&_state; } | |
| 166 | |
| 167 static address safepoint_counter_addr() { return (address)&_safepoint_counter; } | |
| 168 }; | |
| 169 | |
| 170 // State class for a thread suspended at a safepoint | |
| 171 class ThreadSafepointState: public CHeapObj { | |
| 172 public: | |
| 173 // These states are maintained by VM thread while threads are being brought | |
| 174 // to a safepoint. After SafepointSynchronize::end(), they are reset to | |
| 175 // _running. | |
| 176 enum suspend_type { | |
| 177 _running = 0, // Thread state not yet determined (i.e., not at a safepoint yet) | |
| 178 _at_safepoint = 1, // Thread at a safepoint (f.ex., when blocked on a lock) | |
| 179 _call_back = 2 // Keep executing and wait for callback (if thread is in interpreted or vm) | |
| 180 }; | |
| 181 private: | |
| 182 volatile bool _at_poll_safepoint; // At polling page safepoint (NOT a poll return safepoint) | |
| 183 // Thread has called back the safepoint code (for debugging) | |
| 184 bool _has_called_back; | |
| 185 | |
| 186 JavaThread * _thread; | |
| 187 volatile suspend_type _type; | |
| 188 | |
| 189 | |
| 190 public: | |
| 191 ThreadSafepointState(JavaThread *thread); | |
| 192 | |
| 193 // examine/roll-forward/restart | |
| 194 void examine_state_of_thread(); | |
| 195 void roll_forward(suspend_type type); | |
| 196 void restart(); | |
| 197 | |
| 198 // Query | |
| 199 JavaThread* thread() const { return _thread; } | |
| 200 suspend_type type() const { return _type; } | |
| 201 bool is_running() const { return (_type==_running); } | |
| 202 | |
| 203 // Support for safepoint timeout (debugging) | |
| 204 bool has_called_back() const { return _has_called_back; } | |
| 205 void set_has_called_back(bool val) { _has_called_back = val; } | |
| 206 bool is_at_poll_safepoint() { return _at_poll_safepoint; } | |
| 207 void set_at_poll_safepoint(bool val) { _at_poll_safepoint = val; } | |
| 208 | |
| 209 void handle_polling_page_exception(); | |
| 210 | |
| 211 // debugging | |
| 212 void print_on(outputStream* st) const; | |
| 213 void print() const { print_on(tty); } | |
| 214 | |
| 215 // Initialize | |
| 216 static void create(JavaThread *thread); | |
| 217 static void destroy(JavaThread *thread); | |
| 218 | |
| 219 void safepoint_msg(const char* format, ...) { | |
| 220 if (ShowSafepointMsgs) { | |
| 221 va_list ap; | |
| 222 va_start(ap, format); | |
| 223 tty->vprint_cr(format, ap); | |
| 224 va_end(ap); | |
| 225 } | |
| 226 } | |
| 227 }; | |
| 228 | |
| 229 // | |
| 230 // CounterDecay | |
| 231 // | |
| 232 // Interates through invocation counters and decrements them. This | |
| 233 // is done at each safepoint. | |
| 234 // | |
| 235 class CounterDecay : public AllStatic { | |
| 236 static jlong _last_timestamp; | |
| 237 public: | |
| 238 static void decay(); | |
| 239 static bool is_decay_needed() { return (os::javaTimeMillis() - _last_timestamp) > CounterDecayMinIntervalLength; } | |
| 240 }; |