Mercurial > hg > graal-compiler
annotate src/share/vm/prims/jvmtiThreadState.cpp @ 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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2 * Copyright (c) 2003, 2006, Oracle and/or its affiliates. All rights reserved. |
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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 | |
25 # include "incls/_precompiled.incl" | |
26 # include "incls/_jvmtiThreadState.cpp.incl" | |
27 | |
28 // marker for when the stack depth has been reset and is now unknown. | |
29 // any negative number would work but small ones might obscure an | |
30 // underrun error. | |
31 static const int UNKNOWN_STACK_DEPTH = -99; | |
32 | |
33 /////////////////////////////////////////////////////////////// | |
34 // | |
35 // class JvmtiThreadState | |
36 // | |
37 // Instances of JvmtiThreadState hang off of each thread. | |
38 // Thread local storage for JVMTI. | |
39 // | |
40 | |
41 JvmtiThreadState *JvmtiThreadState::_head = NULL; | |
42 | |
43 JvmtiThreadState::JvmtiThreadState(JavaThread* thread) | |
44 : _thread_event_enable() { | |
45 assert(JvmtiThreadState_lock->is_locked(), "sanity check"); | |
46 _thread = thread; | |
47 _exception_detected = false; | |
48 _exception_caught = false; | |
49 _debuggable = true; | |
50 _hide_single_stepping = false; | |
51 _hide_level = 0; | |
52 _pending_step_for_popframe = false; | |
53 _class_being_redefined = NULL; | |
54 _class_load_kind = jvmti_class_load_kind_load; | |
55 _head_env_thread_state = NULL; | |
56 _dynamic_code_event_collector = NULL; | |
57 _vm_object_alloc_event_collector = NULL; | |
58 _the_class_for_redefinition_verification = NULL; | |
59 _scratch_class_for_redefinition_verification = NULL; | |
60 | |
61 // JVMTI ForceEarlyReturn support | |
62 _pending_step_for_earlyret = false; | |
63 _earlyret_state = earlyret_inactive; | |
64 _earlyret_tos = ilgl; | |
65 _earlyret_value.j = 0L; | |
66 _earlyret_oop = NULL; | |
67 | |
68 // add all the JvmtiEnvThreadState to the new JvmtiThreadState | |
69 { | |
70 JvmtiEnvIterator it; | |
71 for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) { | |
72 if (env->is_valid()) { | |
73 add_env(env); | |
74 } | |
75 } | |
76 } | |
77 | |
78 // link us into the list | |
79 { | |
80 // The thread state list manipulation code must not have safepoints. | |
81 // See periodic_clean_up(). | |
82 debug_only(No_Safepoint_Verifier nosafepoint;) | |
83 | |
84 _prev = NULL; | |
85 _next = _head; | |
86 if (_head != NULL) { | |
87 _head->_prev = this; | |
88 } | |
89 _head = this; | |
90 } | |
91 | |
92 // set this as the state for the thread | |
93 thread->set_jvmti_thread_state(this); | |
94 } | |
95 | |
96 | |
97 JvmtiThreadState::~JvmtiThreadState() { | |
98 assert(JvmtiThreadState_lock->is_locked(), "sanity check"); | |
99 | |
100 // clear this as the state for the thread | |
101 get_thread()->set_jvmti_thread_state(NULL); | |
102 | |
103 // zap our env thread states | |
104 { | |
105 JvmtiEnvBase::entering_dying_thread_env_iteration(); | |
106 JvmtiEnvThreadStateIterator it(this); | |
107 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ) { | |
108 JvmtiEnvThreadState* zap = ets; | |
109 ets = it.next(ets); | |
110 delete zap; | |
111 } | |
112 JvmtiEnvBase::leaving_dying_thread_env_iteration(); | |
113 } | |
114 | |
115 // remove us from the list | |
116 { | |
117 // The thread state list manipulation code must not have safepoints. | |
118 // See periodic_clean_up(). | |
119 debug_only(No_Safepoint_Verifier nosafepoint;) | |
120 | |
121 if (_prev == NULL) { | |
122 assert(_head == this, "sanity check"); | |
123 _head = _next; | |
124 } else { | |
125 assert(_head != this, "sanity check"); | |
126 _prev->_next = _next; | |
127 } | |
128 if (_next != NULL) { | |
129 _next->_prev = _prev; | |
130 } | |
131 _next = NULL; | |
132 _prev = NULL; | |
133 } | |
134 } | |
135 | |
136 | |
137 void | |
138 JvmtiThreadState::periodic_clean_up() { | |
139 assert(SafepointSynchronize::is_at_safepoint(), "at safepoint"); | |
140 | |
141 // This iteration is initialized with "_head" instead of "JvmtiThreadState::first()" | |
142 // because the latter requires the JvmtiThreadState_lock. | |
143 // This iteration is safe at a safepoint as well, see the No_Safepoint_Verifier | |
144 // asserts at all list manipulation sites. | |
145 for (JvmtiThreadState *state = _head; state != NULL; state = state->next()) { | |
146 // For each environment thread state corresponding to an invalid environment | |
147 // unlink it from the list and deallocate it. | |
148 JvmtiEnvThreadStateIterator it(state); | |
149 JvmtiEnvThreadState* previous_ets = NULL; | |
150 JvmtiEnvThreadState* ets = it.first(); | |
151 while (ets != NULL) { | |
152 if (ets->get_env()->is_valid()) { | |
153 previous_ets = ets; | |
154 ets = it.next(ets); | |
155 } else { | |
156 // This one isn't valid, remove it from the list and deallocate it | |
157 JvmtiEnvThreadState* defunct_ets = ets; | |
158 ets = ets->next(); | |
159 if (previous_ets == NULL) { | |
160 assert(state->head_env_thread_state() == defunct_ets, "sanity check"); | |
161 state->set_head_env_thread_state(ets); | |
162 } else { | |
163 previous_ets->set_next(ets); | |
164 } | |
165 delete defunct_ets; | |
166 } | |
167 } | |
168 } | |
169 } | |
170 | |
171 void JvmtiThreadState::add_env(JvmtiEnvBase *env) { | |
172 assert(JvmtiThreadState_lock->is_locked(), "sanity check"); | |
173 | |
174 JvmtiEnvThreadState *new_ets = new JvmtiEnvThreadState(_thread, env); | |
175 // add this environment thread state to the end of the list (order is important) | |
176 { | |
177 // list deallocation (which occurs at a safepoint) cannot occur simultaneously | |
178 debug_only(No_Safepoint_Verifier nosafepoint;) | |
179 | |
180 JvmtiEnvThreadStateIterator it(this); | |
181 JvmtiEnvThreadState* previous_ets = NULL; | |
182 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { | |
183 previous_ets = ets; | |
184 } | |
185 if (previous_ets == NULL) { | |
186 set_head_env_thread_state(new_ets); | |
187 } else { | |
188 previous_ets->set_next(new_ets); | |
189 } | |
190 } | |
191 } | |
192 | |
193 | |
194 | |
195 | |
196 void JvmtiThreadState::enter_interp_only_mode() { | |
197 assert(_thread->get_interp_only_mode() == 0, "entering interp only when mode not zero"); | |
198 _thread->increment_interp_only_mode(); | |
199 } | |
200 | |
201 | |
202 void JvmtiThreadState::leave_interp_only_mode() { | |
203 assert(_thread->get_interp_only_mode() == 1, "leaving interp only when mode not one"); | |
204 _thread->decrement_interp_only_mode(); | |
205 } | |
206 | |
207 | |
208 // Helper routine used in several places | |
209 int JvmtiThreadState::count_frames() { | |
210 #ifdef ASSERT | |
211 uint32_t debug_bits = 0; | |
212 #endif | |
213 assert(SafepointSynchronize::is_at_safepoint() || | |
214 JvmtiEnv::is_thread_fully_suspended(get_thread(), false, &debug_bits), | |
215 "at safepoint or must be suspended"); | |
216 | |
217 if (!get_thread()->has_last_Java_frame()) return 0; // no Java frames | |
218 | |
219 ResourceMark rm; | |
220 RegisterMap reg_map(get_thread()); | |
221 javaVFrame *jvf = get_thread()->last_java_vframe(®_map); | |
222 int n = 0; | |
223 // tty->print_cr("CSD: counting frames on %s ...", | |
224 // JvmtiTrace::safe_get_thread_name(get_thread())); | |
225 while (jvf != NULL) { | |
226 methodOop method = jvf->method(); | |
227 // tty->print_cr("CSD: frame - method %s.%s - loc %d", | |
228 // method->klass_name()->as_C_string(), | |
229 // method->name()->as_C_string(), | |
230 // jvf->bci() ); | |
231 jvf = jvf->java_sender(); | |
232 n++; | |
233 } | |
234 // tty->print_cr("CSD: frame count: %d", n); | |
235 return n; | |
236 } | |
237 | |
238 | |
239 void JvmtiThreadState::invalidate_cur_stack_depth() { | |
240 Thread *cur = Thread::current(); | |
241 uint32_t debug_bits = 0; | |
242 | |
243 // The caller can be the VMThread at a safepoint, the current thread | |
244 // or the target thread must be suspended. | |
245 guarantee((cur->is_VM_thread() && SafepointSynchronize::is_at_safepoint()) || | |
246 (JavaThread *)cur == get_thread() || | |
247 JvmtiEnv::is_thread_fully_suspended(get_thread(), false, &debug_bits), | |
248 "sanity check"); | |
249 | |
250 _cur_stack_depth = UNKNOWN_STACK_DEPTH; | |
251 } | |
252 | |
253 void JvmtiThreadState::incr_cur_stack_depth() { | |
254 guarantee(JavaThread::current() == get_thread(), "must be current thread"); | |
255 | |
256 if (!is_interp_only_mode()) { | |
257 _cur_stack_depth = UNKNOWN_STACK_DEPTH; | |
258 } | |
259 if (_cur_stack_depth != UNKNOWN_STACK_DEPTH) { | |
260 ++_cur_stack_depth; | |
261 } | |
262 } | |
263 | |
264 void JvmtiThreadState::decr_cur_stack_depth() { | |
265 guarantee(JavaThread::current() == get_thread(), "must be current thread"); | |
266 | |
267 if (!is_interp_only_mode()) { | |
268 _cur_stack_depth = UNKNOWN_STACK_DEPTH; | |
269 } | |
270 if (_cur_stack_depth != UNKNOWN_STACK_DEPTH) { | |
271 --_cur_stack_depth; | |
272 assert(_cur_stack_depth >= 0, "incr/decr_cur_stack_depth mismatch"); | |
273 } | |
274 } | |
275 | |
276 int JvmtiThreadState::cur_stack_depth() { | |
277 uint32_t debug_bits = 0; | |
278 guarantee(JavaThread::current() == get_thread() || | |
279 JvmtiEnv::is_thread_fully_suspended(get_thread(), false, &debug_bits), | |
280 "must be current thread or suspended"); | |
281 | |
282 if (!is_interp_only_mode() || _cur_stack_depth == UNKNOWN_STACK_DEPTH) { | |
283 _cur_stack_depth = count_frames(); | |
284 } else { | |
285 // heavy weight assert | |
286 assert(_cur_stack_depth == count_frames(), | |
287 "cur_stack_depth out of sync"); | |
288 } | |
289 return _cur_stack_depth; | |
290 } | |
291 | |
292 bool JvmtiThreadState::may_be_walked() { | |
293 return (get_thread()->is_being_ext_suspended() || (JavaThread::current() == get_thread())); | |
294 } | |
295 | |
296 | |
297 void JvmtiThreadState::process_pending_step_for_popframe() { | |
298 // We are single stepping as the last part of the PopFrame() dance | |
299 // so we have some house keeping to do. | |
300 | |
301 JavaThread *thr = get_thread(); | |
302 if (thr->popframe_condition() != JavaThread::popframe_inactive) { | |
303 // If the popframe_condition field is not popframe_inactive, then | |
304 // we missed all of the popframe_field cleanup points: | |
305 // | |
306 // - unpack_frames() was not called (nothing to deopt) | |
307 // - remove_activation_preserving_args_entry() was not called | |
308 // (did not get suspended in a call_vm() family call and did | |
309 // not complete a call_vm() family call on the way here) | |
310 thr->clear_popframe_condition(); | |
311 } | |
312 | |
313 // clearing the flag indicates we are done with the PopFrame() dance | |
314 clr_pending_step_for_popframe(); | |
315 | |
316 // If step is pending for popframe then it may not be | |
317 // a repeat step. The new_bci and method_id is same as current_bci | |
318 // and current method_id after pop and step for recursive calls. | |
319 // Force the step by clearing the last location. | |
320 JvmtiEnvThreadStateIterator it(this); | |
321 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { | |
322 ets->clear_current_location(); | |
323 } | |
324 } | |
325 | |
326 | |
327 // Class: JvmtiThreadState | |
328 // Function: update_for_pop_top_frame | |
329 // Description: | |
330 // This function removes any frame pop notification request for | |
331 // the top frame and invalidates both the current stack depth and | |
332 // all cached frameIDs. | |
333 // | |
334 // Called by: PopFrame | |
335 // | |
336 void JvmtiThreadState::update_for_pop_top_frame() { | |
337 if (is_interp_only_mode()) { | |
338 // remove any frame pop notification request for the top frame | |
339 // in any environment | |
340 int popframe_number = cur_stack_depth(); | |
341 { | |
342 JvmtiEnvThreadStateIterator it(this); | |
343 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { | |
344 if (ets->is_frame_pop(popframe_number)) { | |
345 ets->clear_frame_pop(popframe_number); | |
346 } | |
347 } | |
348 } | |
349 // force stack depth to be recalculated | |
350 invalidate_cur_stack_depth(); | |
351 } else { | |
352 assert(!is_enabled(JVMTI_EVENT_FRAME_POP), "Must have no framepops set"); | |
353 } | |
354 } | |
355 | |
356 | |
357 void JvmtiThreadState::process_pending_step_for_earlyret() { | |
358 // We are single stepping as the last part of the ForceEarlyReturn | |
359 // dance so we have some house keeping to do. | |
360 | |
361 if (is_earlyret_pending()) { | |
362 // If the earlyret_state field is not earlyret_inactive, then | |
363 // we missed all of the earlyret_field cleanup points: | |
364 // | |
365 // - remove_activation() was not called | |
366 // (did not get suspended in a call_vm() family call and did | |
367 // not complete a call_vm() family call on the way here) | |
368 // | |
369 // One legitimate way for us to miss all the cleanup points is | |
370 // if we got here right after handling a compiled return. If that | |
371 // is the case, then we consider our return from compiled code to | |
372 // complete the ForceEarlyReturn request and we clear the condition. | |
373 clr_earlyret_pending(); | |
374 set_earlyret_oop(NULL); | |
375 clr_earlyret_value(); | |
376 } | |
377 | |
378 // clearing the flag indicates we are done with | |
379 // the ForceEarlyReturn() dance | |
380 clr_pending_step_for_earlyret(); | |
381 | |
382 // If step is pending for earlyret then it may not be a repeat step. | |
383 // The new_bci and method_id is same as current_bci and current | |
384 // method_id after earlyret and step for recursive calls. | |
385 // Force the step by clearing the last location. | |
386 JvmtiEnvThreadStateIterator it(this); | |
387 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { | |
388 ets->clear_current_location(); | |
389 } | |
390 } | |
391 | |
392 void JvmtiThreadState::oops_do(OopClosure* f) { | |
393 f->do_oop((oop*) &_earlyret_oop); | |
394 } |