Mercurial > hg > truffle
annotate src/share/vm/runtime/simpleThresholdPolicy.cpp @ 3905:c26de9aef2ed
7071307: MethodHandle bimorphic inlining should consider the frequency
Reviewed-by: twisti, roland, kvn, iveresov
author | never |
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date | Fri, 02 Sep 2011 20:58:21 -0700 |
parents | 43f9d800f276 |
children | 973293defacd |
rev | line source |
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1783 | 1 /* |
3358 | 2 * Copyright (c) 2010, 2011, Oracle and/or its affiliates. All rights reserved. |
1783 | 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" | |
2252 | 31 #include "code/scopeDesc.hpp" |
1783 | 32 |
33 // Print an event. | |
34 void SimpleThresholdPolicy::print_event(EventType type, methodHandle mh, methodHandle imh, | |
35 int bci, CompLevel level) { | |
36 bool inlinee_event = mh() != imh(); | |
37 | |
38 ttyLocker tty_lock; | |
39 tty->print("%lf: [", os::elapsedTime()); | |
40 | |
41 int invocation_count = mh->invocation_count(); | |
42 int backedge_count = mh->backedge_count(); | |
43 switch(type) { | |
44 case CALL: | |
45 tty->print("call"); | |
46 break; | |
47 case LOOP: | |
48 tty->print("loop"); | |
49 break; | |
50 case COMPILE: | |
51 tty->print("compile"); | |
2252 | 52 break; |
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53 case REMOVE_FROM_QUEUE: |
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54 tty->print("remove-from-queue"); |
2252 | 55 break; |
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56 case UPDATE_IN_QUEUE: |
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57 tty->print("update-in-queue"); |
2252 | 58 break; |
59 case REPROFILE: | |
60 tty->print("reprofile"); | |
61 break; | |
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62 case MAKE_NOT_ENTRANT: |
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63 tty->print("make-not-entrant"); |
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64 break; |
2252 | 65 default: |
66 tty->print("unknown"); | |
1783 | 67 } |
68 | |
69 tty->print(" level: %d ", level); | |
70 | |
71 ResourceMark rm; | |
72 char *method_name = mh->name_and_sig_as_C_string(); | |
73 tty->print("[%s", method_name); | |
74 if (inlinee_event) { | |
75 char *inlinee_name = imh->name_and_sig_as_C_string(); | |
76 tty->print(" [%s]] ", inlinee_name); | |
77 } | |
78 else tty->print("] "); | |
79 tty->print("@%d queues: %d,%d", bci, CompileBroker::queue_size(CompLevel_full_profile), | |
80 CompileBroker::queue_size(CompLevel_full_optimization)); | |
81 | |
82 print_specific(type, mh, imh, bci, level); | |
83 | |
84 if (type != COMPILE) { | |
85 methodDataHandle mdh = mh->method_data(); | |
86 int mdo_invocations = 0, mdo_backedges = 0; | |
2252 | 87 int mdo_invocations_start = 0, mdo_backedges_start = 0; |
1783 | 88 if (mdh() != NULL) { |
89 mdo_invocations = mdh->invocation_count(); | |
90 mdo_backedges = mdh->backedge_count(); | |
2252 | 91 mdo_invocations_start = mdh->invocation_count_start(); |
92 mdo_backedges_start = mdh->backedge_count_start(); | |
1783 | 93 } |
2252 | 94 tty->print(" total: %d,%d mdo: %d(%d),%d(%d)", |
1783 | 95 invocation_count, backedge_count, |
2252 | 96 mdo_invocations, mdo_invocations_start, |
97 mdo_backedges, mdo_backedges_start); | |
1783 | 98 tty->print(" max levels: %d,%d", |
99 mh->highest_comp_level(), mh->highest_osr_comp_level()); | |
100 if (inlinee_event) { | |
101 tty->print(" inlinee max levels: %d,%d", imh->highest_comp_level(), imh->highest_osr_comp_level()); | |
102 } | |
103 tty->print(" compilable: "); | |
104 bool need_comma = false; | |
105 if (!mh->is_not_compilable(CompLevel_full_profile)) { | |
106 tty->print("c1"); | |
107 need_comma = true; | |
108 } | |
109 if (!mh->is_not_compilable(CompLevel_full_optimization)) { | |
110 if (need_comma) tty->print(", "); | |
111 tty->print("c2"); | |
112 need_comma = true; | |
113 } | |
114 if (!mh->is_not_osr_compilable()) { | |
115 if (need_comma) tty->print(", "); | |
116 tty->print("osr"); | |
117 } | |
118 tty->print(" status:"); | |
119 if (mh->queued_for_compilation()) { | |
120 tty->print(" in queue"); | |
121 } else tty->print(" idle"); | |
122 } | |
123 tty->print_cr("]"); | |
124 } | |
125 | |
126 void SimpleThresholdPolicy::initialize() { | |
127 if (FLAG_IS_DEFAULT(CICompilerCount)) { | |
128 FLAG_SET_DEFAULT(CICompilerCount, 3); | |
129 } | |
130 int count = CICompilerCount; | |
131 if (CICompilerCountPerCPU) { | |
132 count = MAX2(log2_intptr(os::active_processor_count()), 1) * 3 / 2; | |
133 } | |
134 set_c1_count(MAX2(count / 3, 1)); | |
135 set_c2_count(MAX2(count - count / 3, 1)); | |
136 } | |
137 | |
138 void SimpleThresholdPolicy::set_carry_if_necessary(InvocationCounter *counter) { | |
139 if (!counter->carry() && counter->count() > InvocationCounter::count_limit / 2) { | |
140 counter->set_carry_flag(); | |
141 } | |
142 } | |
143 | |
144 // Set carry flags on the counters if necessary | |
145 void SimpleThresholdPolicy::handle_counter_overflow(methodOop method) { | |
146 set_carry_if_necessary(method->invocation_counter()); | |
147 set_carry_if_necessary(method->backedge_counter()); | |
148 methodDataOop mdo = method->method_data(); | |
149 if (mdo != NULL) { | |
150 set_carry_if_necessary(mdo->invocation_counter()); | |
151 set_carry_if_necessary(mdo->backedge_counter()); | |
152 } | |
153 } | |
154 | |
155 // Called with the queue locked and with at least one element | |
156 CompileTask* SimpleThresholdPolicy::select_task(CompileQueue* compile_queue) { | |
157 return compile_queue->first(); | |
158 } | |
159 | |
2252 | 160 void SimpleThresholdPolicy::reprofile(ScopeDesc* trap_scope, bool is_osr) { |
161 for (ScopeDesc* sd = trap_scope;; sd = sd->sender()) { | |
162 if (PrintTieredEvents) { | |
163 methodHandle mh(sd->method()); | |
164 print_event(REPROFILE, mh, mh, InvocationEntryBci, CompLevel_none); | |
165 } | |
166 methodDataOop mdo = sd->method()->method_data(); | |
167 if (mdo != NULL) { | |
168 mdo->reset_start_counters(); | |
169 } | |
170 if (sd->is_top()) break; | |
171 } | |
172 } | |
173 | |
1783 | 174 nmethod* SimpleThresholdPolicy::event(methodHandle method, methodHandle inlinee, |
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175 int branch_bci, int bci, CompLevel comp_level, nmethod* nm, TRAPS) { |
1783 | 176 if (comp_level == CompLevel_none && |
177 JvmtiExport::can_post_interpreter_events()) { | |
178 assert(THREAD->is_Java_thread(), "Should be java thread"); | |
179 if (((JavaThread*)THREAD)->is_interp_only_mode()) { | |
180 return NULL; | |
181 } | |
182 } | |
183 nmethod *osr_nm = NULL; | |
184 | |
185 handle_counter_overflow(method()); | |
186 if (method() != inlinee()) { | |
187 handle_counter_overflow(inlinee()); | |
188 } | |
189 | |
190 if (PrintTieredEvents) { | |
191 print_event(bci == InvocationEntryBci ? CALL : LOOP, method, inlinee, bci, comp_level); | |
192 } | |
193 | |
194 if (bci == InvocationEntryBci) { | |
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195 method_invocation_event(method, inlinee, comp_level, nm, THREAD); |
1783 | 196 } else { |
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197 method_back_branch_event(method, inlinee, bci, comp_level, nm, THREAD); |
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198 // method == inlinee if the event originated in the main method |
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199 int highest_level = inlinee->highest_osr_comp_level(); |
1783 | 200 if (highest_level > comp_level) { |
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201 osr_nm = inlinee->lookup_osr_nmethod_for(bci, highest_level, false); |
1783 | 202 } |
203 } | |
204 return osr_nm; | |
205 } | |
206 | |
207 // Check if the method can be compiled, change level if necessary | |
208 void SimpleThresholdPolicy::compile(methodHandle mh, int bci, CompLevel level, TRAPS) { | |
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209 assert(level <= TieredStopAtLevel, "Invalid compilation level"); |
1783 | 210 if (level == CompLevel_none) { |
211 return; | |
212 } | |
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213 // Check if the method can be compiled. If it cannot be compiled with C1, continue profiling |
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214 // in the interpreter and then compile with C2 (the transition function will request that, |
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215 // see common() ). If the method cannot be compiled with C2 but still can with C1, compile it with |
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216 // pure C1. |
1783 | 217 if (!can_be_compiled(mh, level)) { |
218 if (level == CompLevel_full_optimization && can_be_compiled(mh, CompLevel_simple)) { | |
219 compile(mh, bci, CompLevel_simple, THREAD); | |
220 } | |
221 return; | |
222 } | |
223 if (bci != InvocationEntryBci && mh->is_not_osr_compilable()) { | |
224 return; | |
225 } | |
226 if (!CompileBroker::compilation_is_in_queue(mh, bci)) { | |
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227 if (PrintTieredEvents) { |
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228 print_event(COMPILE, mh, mh, bci, level); |
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229 } |
1783 | 230 submit_compile(mh, bci, level, THREAD); |
231 } | |
232 } | |
233 | |
234 // Tell the broker to compile the method | |
235 void SimpleThresholdPolicy::submit_compile(methodHandle mh, int bci, CompLevel level, TRAPS) { | |
236 int hot_count = (bci == InvocationEntryBci) ? mh->invocation_count() : mh->backedge_count(); | |
237 CompileBroker::compile_method(mh, bci, level, mh, hot_count, "tiered", THREAD); | |
238 } | |
239 | |
240 // Call and loop predicates determine whether a transition to a higher | |
241 // compilation level should be performed (pointers to predicate functions | |
242 // are passed to common() transition function). | |
243 bool SimpleThresholdPolicy::loop_predicate(int i, int b, CompLevel cur_level) { | |
244 switch(cur_level) { | |
245 case CompLevel_none: | |
246 case CompLevel_limited_profile: { | |
247 return loop_predicate_helper<CompLevel_none>(i, b, 1.0); | |
248 } | |
249 case CompLevel_full_profile: { | |
250 return loop_predicate_helper<CompLevel_full_profile>(i, b, 1.0); | |
251 } | |
252 default: | |
253 return true; | |
254 } | |
255 } | |
256 | |
257 bool SimpleThresholdPolicy::call_predicate(int i, int b, CompLevel cur_level) { | |
258 switch(cur_level) { | |
259 case CompLevel_none: | |
260 case CompLevel_limited_profile: { | |
261 return call_predicate_helper<CompLevel_none>(i, b, 1.0); | |
262 } | |
263 case CompLevel_full_profile: { | |
264 return call_predicate_helper<CompLevel_full_profile>(i, b, 1.0); | |
265 } | |
266 default: | |
267 return true; | |
268 } | |
269 } | |
270 | |
271 // Determine is a method is mature. | |
272 bool SimpleThresholdPolicy::is_mature(methodOop method) { | |
273 if (is_trivial(method)) return true; | |
274 methodDataOop mdo = method->method_data(); | |
275 if (mdo != NULL) { | |
276 int i = mdo->invocation_count(); | |
277 int b = mdo->backedge_count(); | |
278 double k = ProfileMaturityPercentage / 100.0; | |
279 return call_predicate_helper<CompLevel_full_profile>(i, b, k) || | |
280 loop_predicate_helper<CompLevel_full_profile>(i, b, k); | |
281 } | |
282 return false; | |
283 } | |
284 | |
285 // Common transition function. Given a predicate determines if a method should transition to another level. | |
286 CompLevel SimpleThresholdPolicy::common(Predicate p, methodOop method, CompLevel cur_level) { | |
287 CompLevel next_level = cur_level; | |
288 int i = method->invocation_count(); | |
289 int b = method->backedge_count(); | |
290 | |
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291 if (is_trivial(method)) { |
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292 next_level = CompLevel_simple; |
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293 } else { |
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294 switch(cur_level) { |
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295 case CompLevel_none: |
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296 // If we were at full profile level, would we switch to full opt? |
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297 if (common(p, method, CompLevel_full_profile) == CompLevel_full_optimization) { |
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298 next_level = CompLevel_full_optimization; |
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299 } else if ((this->*p)(i, b, cur_level)) { |
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300 next_level = CompLevel_full_profile; |
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301 } |
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302 break; |
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303 case CompLevel_limited_profile: |
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304 case CompLevel_full_profile: |
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305 { |
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306 methodDataOop mdo = method->method_data(); |
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307 if (mdo != NULL) { |
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308 if (mdo->would_profile()) { |
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309 int mdo_i = mdo->invocation_count_delta(); |
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310 int mdo_b = mdo->backedge_count_delta(); |
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311 if ((this->*p)(mdo_i, mdo_b, cur_level)) { |
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312 next_level = CompLevel_full_optimization; |
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313 } |
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314 } else { |
2252 | 315 next_level = CompLevel_full_optimization; |
316 } | |
1783 | 317 } |
318 } | |
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319 break; |
1783 | 320 } |
321 } | |
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322 return MIN2(next_level, (CompLevel)TieredStopAtLevel); |
1783 | 323 } |
324 | |
325 // Determine if a method should be compiled with a normal entry point at a different level. | |
326 CompLevel SimpleThresholdPolicy::call_event(methodOop method, CompLevel cur_level) { | |
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327 CompLevel osr_level = MIN2((CompLevel) method->highest_osr_comp_level(), |
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328 common(&SimpleThresholdPolicy::loop_predicate, method, cur_level)); |
1783 | 329 CompLevel next_level = common(&SimpleThresholdPolicy::call_predicate, method, cur_level); |
330 | |
331 // If OSR method level is greater than the regular method level, the levels should be | |
332 // equalized by raising the regular method level in order to avoid OSRs during each | |
333 // invocation of the method. | |
334 if (osr_level == CompLevel_full_optimization && cur_level == CompLevel_full_profile) { | |
335 methodDataOop mdo = method->method_data(); | |
336 guarantee(mdo != NULL, "MDO should not be NULL"); | |
337 if (mdo->invocation_count() >= 1) { | |
338 next_level = CompLevel_full_optimization; | |
339 } | |
340 } else { | |
341 next_level = MAX2(osr_level, next_level); | |
342 } | |
343 | |
344 return next_level; | |
345 } | |
346 | |
347 // Determine if we should do an OSR compilation of a given method. | |
348 CompLevel SimpleThresholdPolicy::loop_event(methodOop method, CompLevel cur_level) { | |
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349 CompLevel next_level = common(&SimpleThresholdPolicy::loop_predicate, method, cur_level); |
1783 | 350 if (cur_level == CompLevel_none) { |
351 // If there is a live OSR method that means that we deopted to the interpreter | |
352 // for the transition. | |
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353 CompLevel osr_level = MIN2((CompLevel)method->highest_osr_comp_level(), next_level); |
1783 | 354 if (osr_level > CompLevel_none) { |
355 return osr_level; | |
356 } | |
357 } | |
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358 return next_level; |
1783 | 359 } |
360 | |
361 | |
362 // Handle the invocation event. | |
363 void SimpleThresholdPolicy::method_invocation_event(methodHandle mh, methodHandle imh, | |
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364 CompLevel level, nmethod* nm, TRAPS) { |
1783 | 365 if (is_compilation_enabled() && !CompileBroker::compilation_is_in_queue(mh, InvocationEntryBci)) { |
366 CompLevel next_level = call_event(mh(), level); | |
367 if (next_level != level) { | |
368 compile(mh, InvocationEntryBci, next_level, THREAD); | |
369 } | |
370 } | |
371 } | |
372 | |
373 // Handle the back branch event. Notice that we can compile the method | |
374 // with a regular entry from here. | |
375 void SimpleThresholdPolicy::method_back_branch_event(methodHandle mh, methodHandle imh, | |
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376 int bci, CompLevel level, nmethod* nm, TRAPS) { |
1783 | 377 // If the method is already compiling, quickly bail out. |
378 if (is_compilation_enabled() && !CompileBroker::compilation_is_in_queue(mh, bci)) { | |
379 // Use loop event as an opportinity to also check there's been | |
380 // enough calls. | |
381 CompLevel cur_level = comp_level(mh()); | |
382 CompLevel next_level = call_event(mh(), cur_level); | |
383 CompLevel next_osr_level = loop_event(mh(), level); | |
384 | |
385 next_level = MAX2(next_level, | |
386 next_osr_level < CompLevel_full_optimization ? next_osr_level : cur_level); | |
387 bool is_compiling = false; | |
388 if (next_level != cur_level) { | |
389 compile(mh, InvocationEntryBci, next_level, THREAD); | |
390 is_compiling = true; | |
391 } | |
392 | |
393 // Do the OSR version | |
394 if (!is_compiling && next_osr_level != level) { | |
395 compile(mh, bci, next_osr_level, THREAD); | |
396 } | |
397 } | |
398 } |