Mercurial > hg > truffle
annotate src/share/vm/runtime/simpleThresholdPolicy.cpp @ 2137:ffd725ff6943
Merge
author | johnc |
---|---|
date | Thu, 13 Jan 2011 17:19:21 -0800 |
parents | f95d63e2154a |
children | 72d6c57d0658 |
rev | line source |
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1783 | 1 /* |
2 * Copyright (c) 2001, 2010, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
20 * or visit www.oracle.com if you need additional information or have any | |
21 * questions. | |
22 * | |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "compiler/compileBroker.hpp" | |
27 #include "memory/resourceArea.hpp" | |
28 #include "runtime/arguments.hpp" | |
29 #include "runtime/simpleThresholdPolicy.hpp" | |
30 #include "runtime/simpleThresholdPolicy.inline.hpp" | |
1783 | 31 |
32 // Print an event. | |
33 void SimpleThresholdPolicy::print_event(EventType type, methodHandle mh, methodHandle imh, | |
34 int bci, CompLevel level) { | |
35 bool inlinee_event = mh() != imh(); | |
36 | |
37 ttyLocker tty_lock; | |
38 tty->print("%lf: [", os::elapsedTime()); | |
39 | |
40 int invocation_count = mh->invocation_count(); | |
41 int backedge_count = mh->backedge_count(); | |
42 switch(type) { | |
43 case CALL: | |
44 tty->print("call"); | |
45 break; | |
46 case LOOP: | |
47 tty->print("loop"); | |
48 break; | |
49 case COMPILE: | |
50 tty->print("compile"); | |
51 } | |
52 | |
53 tty->print(" level: %d ", level); | |
54 | |
55 ResourceMark rm; | |
56 char *method_name = mh->name_and_sig_as_C_string(); | |
57 tty->print("[%s", method_name); | |
58 // We can have an inlinee, although currently we don't generate any notifications for the inlined methods. | |
59 if (inlinee_event) { | |
60 char *inlinee_name = imh->name_and_sig_as_C_string(); | |
61 tty->print(" [%s]] ", inlinee_name); | |
62 } | |
63 else tty->print("] "); | |
64 tty->print("@%d queues: %d,%d", bci, CompileBroker::queue_size(CompLevel_full_profile), | |
65 CompileBroker::queue_size(CompLevel_full_optimization)); | |
66 | |
67 print_specific(type, mh, imh, bci, level); | |
68 | |
69 if (type != COMPILE) { | |
70 methodDataHandle mdh = mh->method_data(); | |
71 int mdo_invocations = 0, mdo_backedges = 0; | |
72 if (mdh() != NULL) { | |
73 mdo_invocations = mdh->invocation_count(); | |
74 mdo_backedges = mdh->backedge_count(); | |
75 } | |
76 tty->print(" total: %d,%d mdo: %d,%d", | |
77 invocation_count, backedge_count, | |
78 mdo_invocations, mdo_backedges); | |
79 tty->print(" max levels: %d,%d", | |
80 mh->highest_comp_level(), mh->highest_osr_comp_level()); | |
81 if (inlinee_event) { | |
82 tty->print(" inlinee max levels: %d,%d", imh->highest_comp_level(), imh->highest_osr_comp_level()); | |
83 } | |
84 tty->print(" compilable: "); | |
85 bool need_comma = false; | |
86 if (!mh->is_not_compilable(CompLevel_full_profile)) { | |
87 tty->print("c1"); | |
88 need_comma = true; | |
89 } | |
90 if (!mh->is_not_compilable(CompLevel_full_optimization)) { | |
91 if (need_comma) tty->print(", "); | |
92 tty->print("c2"); | |
93 need_comma = true; | |
94 } | |
95 if (!mh->is_not_osr_compilable()) { | |
96 if (need_comma) tty->print(", "); | |
97 tty->print("osr"); | |
98 } | |
99 tty->print(" status:"); | |
100 if (mh->queued_for_compilation()) { | |
101 tty->print(" in queue"); | |
102 } else tty->print(" idle"); | |
103 } | |
104 tty->print_cr("]"); | |
105 } | |
106 | |
107 void SimpleThresholdPolicy::initialize() { | |
108 if (FLAG_IS_DEFAULT(CICompilerCount)) { | |
109 FLAG_SET_DEFAULT(CICompilerCount, 3); | |
110 } | |
111 int count = CICompilerCount; | |
112 if (CICompilerCountPerCPU) { | |
113 count = MAX2(log2_intptr(os::active_processor_count()), 1) * 3 / 2; | |
114 } | |
115 set_c1_count(MAX2(count / 3, 1)); | |
116 set_c2_count(MAX2(count - count / 3, 1)); | |
117 } | |
118 | |
119 void SimpleThresholdPolicy::set_carry_if_necessary(InvocationCounter *counter) { | |
120 if (!counter->carry() && counter->count() > InvocationCounter::count_limit / 2) { | |
121 counter->set_carry_flag(); | |
122 } | |
123 } | |
124 | |
125 // Set carry flags on the counters if necessary | |
126 void SimpleThresholdPolicy::handle_counter_overflow(methodOop method) { | |
127 set_carry_if_necessary(method->invocation_counter()); | |
128 set_carry_if_necessary(method->backedge_counter()); | |
129 methodDataOop mdo = method->method_data(); | |
130 if (mdo != NULL) { | |
131 set_carry_if_necessary(mdo->invocation_counter()); | |
132 set_carry_if_necessary(mdo->backedge_counter()); | |
133 } | |
134 } | |
135 | |
136 // Called with the queue locked and with at least one element | |
137 CompileTask* SimpleThresholdPolicy::select_task(CompileQueue* compile_queue) { | |
138 return compile_queue->first(); | |
139 } | |
140 | |
141 nmethod* SimpleThresholdPolicy::event(methodHandle method, methodHandle inlinee, | |
142 int branch_bci, int bci, CompLevel comp_level, TRAPS) { | |
143 if (comp_level == CompLevel_none && | |
144 JvmtiExport::can_post_interpreter_events()) { | |
145 assert(THREAD->is_Java_thread(), "Should be java thread"); | |
146 if (((JavaThread*)THREAD)->is_interp_only_mode()) { | |
147 return NULL; | |
148 } | |
149 } | |
150 nmethod *osr_nm = NULL; | |
151 | |
152 handle_counter_overflow(method()); | |
153 if (method() != inlinee()) { | |
154 handle_counter_overflow(inlinee()); | |
155 } | |
156 | |
157 if (PrintTieredEvents) { | |
158 print_event(bci == InvocationEntryBci ? CALL : LOOP, method, inlinee, bci, comp_level); | |
159 } | |
160 | |
161 if (bci == InvocationEntryBci) { | |
162 method_invocation_event(method, inlinee, comp_level, THREAD); | |
163 } else { | |
164 method_back_branch_event(method, inlinee, bci, comp_level, THREAD); | |
165 int highest_level = method->highest_osr_comp_level(); | |
166 if (highest_level > comp_level) { | |
167 osr_nm = method->lookup_osr_nmethod_for(bci, highest_level, false); | |
168 } | |
169 } | |
170 return osr_nm; | |
171 } | |
172 | |
173 // Check if the method can be compiled, change level if necessary | |
174 void SimpleThresholdPolicy::compile(methodHandle mh, int bci, CompLevel level, TRAPS) { | |
175 // Take the given ceiling into the account. | |
176 // NOTE: You can set it to 1 to get a pure C1 version. | |
177 if ((CompLevel)TieredStopAtLevel < level) { | |
178 level = (CompLevel)TieredStopAtLevel; | |
179 } | |
180 if (level == CompLevel_none) { | |
181 return; | |
182 } | |
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183 // Check if the method can be compiled. If it cannot be compiled with C1, continue profiling |
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184 // in the interpreter and then compile with C2 (the transition function will request that, |
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185 // see common() ). If the method cannot be compiled with C2 but still can with C1, compile it with |
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186 // pure C1. |
1783 | 187 if (!can_be_compiled(mh, level)) { |
188 if (level == CompLevel_full_optimization && can_be_compiled(mh, CompLevel_simple)) { | |
189 compile(mh, bci, CompLevel_simple, THREAD); | |
190 } | |
191 return; | |
192 } | |
193 if (bci != InvocationEntryBci && mh->is_not_osr_compilable()) { | |
194 return; | |
195 } | |
196 if (PrintTieredEvents) { | |
197 print_event(COMPILE, mh, mh, bci, level); | |
198 } | |
199 if (!CompileBroker::compilation_is_in_queue(mh, bci)) { | |
200 submit_compile(mh, bci, level, THREAD); | |
201 } | |
202 } | |
203 | |
204 // Tell the broker to compile the method | |
205 void SimpleThresholdPolicy::submit_compile(methodHandle mh, int bci, CompLevel level, TRAPS) { | |
206 int hot_count = (bci == InvocationEntryBci) ? mh->invocation_count() : mh->backedge_count(); | |
207 CompileBroker::compile_method(mh, bci, level, mh, hot_count, "tiered", THREAD); | |
208 } | |
209 | |
210 // Call and loop predicates determine whether a transition to a higher | |
211 // compilation level should be performed (pointers to predicate functions | |
212 // are passed to common() transition function). | |
213 bool SimpleThresholdPolicy::loop_predicate(int i, int b, CompLevel cur_level) { | |
214 switch(cur_level) { | |
215 case CompLevel_none: | |
216 case CompLevel_limited_profile: { | |
217 return loop_predicate_helper<CompLevel_none>(i, b, 1.0); | |
218 } | |
219 case CompLevel_full_profile: { | |
220 return loop_predicate_helper<CompLevel_full_profile>(i, b, 1.0); | |
221 } | |
222 default: | |
223 return true; | |
224 } | |
225 } | |
226 | |
227 bool SimpleThresholdPolicy::call_predicate(int i, int b, CompLevel cur_level) { | |
228 switch(cur_level) { | |
229 case CompLevel_none: | |
230 case CompLevel_limited_profile: { | |
231 return call_predicate_helper<CompLevel_none>(i, b, 1.0); | |
232 } | |
233 case CompLevel_full_profile: { | |
234 return call_predicate_helper<CompLevel_full_profile>(i, b, 1.0); | |
235 } | |
236 default: | |
237 return true; | |
238 } | |
239 } | |
240 | |
241 // Determine is a method is mature. | |
242 bool SimpleThresholdPolicy::is_mature(methodOop method) { | |
243 if (is_trivial(method)) return true; | |
244 methodDataOop mdo = method->method_data(); | |
245 if (mdo != NULL) { | |
246 int i = mdo->invocation_count(); | |
247 int b = mdo->backedge_count(); | |
248 double k = ProfileMaturityPercentage / 100.0; | |
249 return call_predicate_helper<CompLevel_full_profile>(i, b, k) || | |
250 loop_predicate_helper<CompLevel_full_profile>(i, b, k); | |
251 } | |
252 return false; | |
253 } | |
254 | |
255 // Common transition function. Given a predicate determines if a method should transition to another level. | |
256 CompLevel SimpleThresholdPolicy::common(Predicate p, methodOop method, CompLevel cur_level) { | |
257 CompLevel next_level = cur_level; | |
258 int i = method->invocation_count(); | |
259 int b = method->backedge_count(); | |
260 | |
261 switch(cur_level) { | |
262 case CompLevel_none: | |
263 { | |
264 methodDataOop mdo = method->method_data(); | |
265 if (mdo != NULL) { | |
266 int mdo_i = mdo->invocation_count(); | |
267 int mdo_b = mdo->backedge_count(); | |
268 // If we were at full profile level, would we switch to full opt? | |
269 if ((this->*p)(mdo_i, mdo_b, CompLevel_full_profile)) { | |
270 next_level = CompLevel_full_optimization; | |
271 } | |
272 } | |
273 } | |
274 if (next_level == cur_level && (this->*p)(i, b, cur_level)) { | |
275 if (is_trivial(method)) { | |
276 next_level = CompLevel_simple; | |
277 } else { | |
278 next_level = CompLevel_full_profile; | |
279 } | |
280 } | |
281 break; | |
282 case CompLevel_limited_profile: | |
283 case CompLevel_full_profile: | |
284 if (is_trivial(method)) { | |
285 next_level = CompLevel_simple; | |
286 } else { | |
287 methodDataOop mdo = method->method_data(); | |
288 guarantee(mdo != NULL, "MDO should always exist"); | |
289 if (mdo->would_profile()) { | |
290 int mdo_i = mdo->invocation_count(); | |
291 int mdo_b = mdo->backedge_count(); | |
292 if ((this->*p)(mdo_i, mdo_b, cur_level)) { | |
293 next_level = CompLevel_full_optimization; | |
294 } | |
295 } else { | |
296 next_level = CompLevel_full_optimization; | |
297 } | |
298 } | |
299 break; | |
300 } | |
301 return next_level; | |
302 } | |
303 | |
304 // Determine if a method should be compiled with a normal entry point at a different level. | |
305 CompLevel SimpleThresholdPolicy::call_event(methodOop method, CompLevel cur_level) { | |
306 CompLevel highest_level = (CompLevel)method->highest_comp_level(); | |
307 if (cur_level == CompLevel_none && highest_level > cur_level) { | |
308 // TODO: We may want to try to do more extensive reprofiling in this case. | |
309 return highest_level; | |
310 } | |
311 | |
312 CompLevel osr_level = (CompLevel) method->highest_osr_comp_level(); | |
313 CompLevel next_level = common(&SimpleThresholdPolicy::call_predicate, method, cur_level); | |
314 | |
315 // If OSR method level is greater than the regular method level, the levels should be | |
316 // equalized by raising the regular method level in order to avoid OSRs during each | |
317 // invocation of the method. | |
318 if (osr_level == CompLevel_full_optimization && cur_level == CompLevel_full_profile) { | |
319 methodDataOop mdo = method->method_data(); | |
320 guarantee(mdo != NULL, "MDO should not be NULL"); | |
321 if (mdo->invocation_count() >= 1) { | |
322 next_level = CompLevel_full_optimization; | |
323 } | |
324 } else { | |
325 next_level = MAX2(osr_level, next_level); | |
326 } | |
327 | |
328 return next_level; | |
329 } | |
330 | |
331 // Determine if we should do an OSR compilation of a given method. | |
332 CompLevel SimpleThresholdPolicy::loop_event(methodOop method, CompLevel cur_level) { | |
333 if (cur_level == CompLevel_none) { | |
334 // If there is a live OSR method that means that we deopted to the interpreter | |
335 // for the transition. | |
336 CompLevel osr_level = (CompLevel)method->highest_osr_comp_level(); | |
337 if (osr_level > CompLevel_none) { | |
338 return osr_level; | |
339 } | |
340 } | |
341 return common(&SimpleThresholdPolicy::loop_predicate, method, cur_level); | |
342 } | |
343 | |
344 | |
345 // Handle the invocation event. | |
346 void SimpleThresholdPolicy::method_invocation_event(methodHandle mh, methodHandle imh, | |
347 CompLevel level, TRAPS) { | |
348 if (is_compilation_enabled() && !CompileBroker::compilation_is_in_queue(mh, InvocationEntryBci)) { | |
349 CompLevel next_level = call_event(mh(), level); | |
350 if (next_level != level) { | |
351 compile(mh, InvocationEntryBci, next_level, THREAD); | |
352 } | |
353 } | |
354 } | |
355 | |
356 // Handle the back branch event. Notice that we can compile the method | |
357 // with a regular entry from here. | |
358 void SimpleThresholdPolicy::method_back_branch_event(methodHandle mh, methodHandle imh, | |
359 int bci, CompLevel level, TRAPS) { | |
360 // If the method is already compiling, quickly bail out. | |
361 if (is_compilation_enabled() && !CompileBroker::compilation_is_in_queue(mh, bci)) { | |
362 // Use loop event as an opportinity to also check there's been | |
363 // enough calls. | |
364 CompLevel cur_level = comp_level(mh()); | |
365 CompLevel next_level = call_event(mh(), cur_level); | |
366 CompLevel next_osr_level = loop_event(mh(), level); | |
367 | |
368 next_level = MAX2(next_level, | |
369 next_osr_level < CompLevel_full_optimization ? next_osr_level : cur_level); | |
370 bool is_compiling = false; | |
371 if (next_level != cur_level) { | |
372 compile(mh, InvocationEntryBci, next_level, THREAD); | |
373 is_compiling = true; | |
374 } | |
375 | |
376 // Do the OSR version | |
377 if (!is_compiling && next_osr_level != level) { | |
378 compile(mh, bci, next_osr_level, THREAD); | |
379 } | |
380 } | |
381 } |