Tue, 11 Nov 2014 11:05:41 +0100
8056071: compiler/whitebox/IsMethodCompilableTest.java fails with 'method() is not compilable after 3 iterations'
Summary: Always use MDO if valid and always compile trivial methods with C1 if available.
Reviewed-by: kvn, iveresov
1 /*
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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23 */
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"
31 #include "code/scopeDesc.hpp"
34 void SimpleThresholdPolicy::print_counters(const char* prefix, methodHandle mh) {
35 int invocation_count = mh->invocation_count();
36 int backedge_count = mh->backedge_count();
37 MethodData* mdh = mh->method_data();
38 int mdo_invocations = 0, mdo_backedges = 0;
39 int mdo_invocations_start = 0, mdo_backedges_start = 0;
40 if (mdh != NULL) {
41 mdo_invocations = mdh->invocation_count();
42 mdo_backedges = mdh->backedge_count();
43 mdo_invocations_start = mdh->invocation_count_start();
44 mdo_backedges_start = mdh->backedge_count_start();
45 }
46 tty->print(" %stotal=%d,%d %smdo=%d(%d),%d(%d)", prefix,
47 invocation_count, backedge_count, prefix,
48 mdo_invocations, mdo_invocations_start,
49 mdo_backedges, mdo_backedges_start);
50 tty->print(" %smax levels=%d,%d", prefix,
51 mh->highest_comp_level(), mh->highest_osr_comp_level());
52 }
54 // Print an event.
55 void SimpleThresholdPolicy::print_event(EventType type, methodHandle mh, methodHandle imh,
56 int bci, CompLevel level) {
57 bool inlinee_event = mh() != imh();
59 ttyLocker tty_lock;
60 tty->print("%lf: [", os::elapsedTime());
62 switch(type) {
63 case CALL:
64 tty->print("call");
65 break;
66 case LOOP:
67 tty->print("loop");
68 break;
69 case COMPILE:
70 tty->print("compile");
71 break;
72 case REMOVE_FROM_QUEUE:
73 tty->print("remove-from-queue");
74 break;
75 case UPDATE_IN_QUEUE:
76 tty->print("update-in-queue");
77 break;
78 case REPROFILE:
79 tty->print("reprofile");
80 break;
81 case MAKE_NOT_ENTRANT:
82 tty->print("make-not-entrant");
83 break;
84 default:
85 tty->print("unknown");
86 }
88 tty->print(" level=%d ", level);
90 ResourceMark rm;
91 char *method_name = mh->name_and_sig_as_C_string();
92 tty->print("[%s", method_name);
93 if (inlinee_event) {
94 char *inlinee_name = imh->name_and_sig_as_C_string();
95 tty->print(" [%s]] ", inlinee_name);
96 }
97 else tty->print("] ");
98 tty->print("@%d queues=%d,%d", bci, CompileBroker::queue_size(CompLevel_full_profile),
99 CompileBroker::queue_size(CompLevel_full_optimization));
101 print_specific(type, mh, imh, bci, level);
103 if (type != COMPILE) {
104 print_counters("", mh);
105 if (inlinee_event) {
106 print_counters("inlinee ", imh);
107 }
108 tty->print(" compilable=");
109 bool need_comma = false;
110 if (!mh->is_not_compilable(CompLevel_full_profile)) {
111 tty->print("c1");
112 need_comma = true;
113 }
114 if (!mh->is_not_osr_compilable(CompLevel_full_profile)) {
115 if (need_comma) tty->print(",");
116 tty->print("c1-osr");
117 need_comma = true;
118 }
119 if (!mh->is_not_compilable(CompLevel_full_optimization)) {
120 if (need_comma) tty->print(",");
121 tty->print("c2");
122 need_comma = true;
123 }
124 if (!mh->is_not_osr_compilable(CompLevel_full_optimization)) {
125 if (need_comma) tty->print(",");
126 tty->print("c2-osr");
127 }
128 tty->print(" status=");
129 if (mh->queued_for_compilation()) {
130 tty->print("in-queue");
131 } else tty->print("idle");
132 }
133 tty->print_cr("]");
134 }
136 void SimpleThresholdPolicy::initialize() {
137 if (FLAG_IS_DEFAULT(CICompilerCount)) {
138 FLAG_SET_DEFAULT(CICompilerCount, 3);
139 }
140 int count = CICompilerCount;
141 if (CICompilerCountPerCPU) {
142 count = MAX2(log2_intptr(os::active_processor_count()), 1) * 3 / 2;
143 }
144 set_c1_count(MAX2(count / 3, 1));
145 set_c2_count(MAX2(count - c1_count(), 1));
146 FLAG_SET_ERGO(intx, CICompilerCount, c1_count() + c2_count());
147 }
149 void SimpleThresholdPolicy::set_carry_if_necessary(InvocationCounter *counter) {
150 if (!counter->carry() && counter->count() > InvocationCounter::count_limit / 2) {
151 counter->set_carry_flag();
152 }
153 }
155 // Set carry flags on the counters if necessary
156 void SimpleThresholdPolicy::handle_counter_overflow(Method* method) {
157 MethodCounters *mcs = method->method_counters();
158 if (mcs != NULL) {
159 set_carry_if_necessary(mcs->invocation_counter());
160 set_carry_if_necessary(mcs->backedge_counter());
161 }
162 MethodData* mdo = method->method_data();
163 if (mdo != NULL) {
164 set_carry_if_necessary(mdo->invocation_counter());
165 set_carry_if_necessary(mdo->backedge_counter());
166 }
167 }
169 // Called with the queue locked and with at least one element
170 CompileTask* SimpleThresholdPolicy::select_task(CompileQueue* compile_queue) {
171 return compile_queue->first();
172 }
174 void SimpleThresholdPolicy::reprofile(ScopeDesc* trap_scope, bool is_osr) {
175 for (ScopeDesc* sd = trap_scope;; sd = sd->sender()) {
176 if (PrintTieredEvents) {
177 methodHandle mh(sd->method());
178 print_event(REPROFILE, mh, mh, InvocationEntryBci, CompLevel_none);
179 }
180 MethodData* mdo = sd->method()->method_data();
181 if (mdo != NULL) {
182 mdo->reset_start_counters();
183 }
184 if (sd->is_top()) break;
185 }
186 }
188 nmethod* SimpleThresholdPolicy::event(methodHandle method, methodHandle inlinee,
189 int branch_bci, int bci, CompLevel comp_level, nmethod* nm, JavaThread* thread) {
190 if (comp_level == CompLevel_none &&
191 JvmtiExport::can_post_interpreter_events() &&
192 thread->is_interp_only_mode()) {
193 return NULL;
194 }
195 if (CompileTheWorld || ReplayCompiles) {
196 // Don't trigger other compiles in testing mode
197 return NULL;
198 }
200 handle_counter_overflow(method());
201 if (method() != inlinee()) {
202 handle_counter_overflow(inlinee());
203 }
205 if (PrintTieredEvents) {
206 print_event(bci == InvocationEntryBci ? CALL : LOOP, method, inlinee, bci, comp_level);
207 }
209 if (bci == InvocationEntryBci) {
210 method_invocation_event(method, inlinee, comp_level, nm, thread);
211 } else {
212 // method == inlinee if the event originated in the main method
213 method_back_branch_event(method, inlinee, bci, comp_level, nm, thread);
214 // Check if event led to a higher level OSR compilation
215 nmethod* osr_nm = inlinee->lookup_osr_nmethod_for(bci, comp_level, false);
216 if (osr_nm != NULL && osr_nm->comp_level() > comp_level) {
217 // Perform OSR with new nmethod
218 return osr_nm;
219 }
220 }
221 return NULL;
222 }
224 // Check if the method can be compiled, change level if necessary
225 void SimpleThresholdPolicy::compile(methodHandle mh, int bci, CompLevel level, JavaThread* thread) {
226 assert(level <= TieredStopAtLevel, "Invalid compilation level");
227 if (level == CompLevel_none) {
228 return;
229 }
230 // Check if the method can be compiled. If it cannot be compiled with C1, continue profiling
231 // in the interpreter and then compile with C2 (the transition function will request that,
232 // see common() ). If the method cannot be compiled with C2 but still can with C1, compile it with
233 // pure C1.
234 if (!can_be_compiled(mh, level)) {
235 if (level == CompLevel_full_optimization && can_be_compiled(mh, CompLevel_simple)) {
236 compile(mh, bci, CompLevel_simple, thread);
237 }
238 return;
239 }
240 if (bci != InvocationEntryBci && mh->is_not_osr_compilable(level)) {
241 return;
242 }
243 if (!CompileBroker::compilation_is_in_queue(mh)) {
244 if (PrintTieredEvents) {
245 print_event(COMPILE, mh, mh, bci, level);
246 }
247 submit_compile(mh, bci, level, thread);
248 }
249 }
251 // Tell the broker to compile the method
252 void SimpleThresholdPolicy::submit_compile(methodHandle mh, int bci, CompLevel level, JavaThread* thread) {
253 int hot_count = (bci == InvocationEntryBci) ? mh->invocation_count() : mh->backedge_count();
254 CompileBroker::compile_method(mh, bci, level, mh, hot_count, "tiered", thread);
255 }
257 // Call and loop predicates determine whether a transition to a higher
258 // compilation level should be performed (pointers to predicate functions
259 // are passed to common() transition function).
260 bool SimpleThresholdPolicy::loop_predicate(int i, int b, CompLevel cur_level) {
261 switch(cur_level) {
262 case CompLevel_none:
263 case CompLevel_limited_profile: {
264 return loop_predicate_helper<CompLevel_none>(i, b, 1.0);
265 }
266 case CompLevel_full_profile: {
267 return loop_predicate_helper<CompLevel_full_profile>(i, b, 1.0);
268 }
269 default:
270 return true;
271 }
272 }
274 bool SimpleThresholdPolicy::call_predicate(int i, int b, CompLevel cur_level) {
275 switch(cur_level) {
276 case CompLevel_none:
277 case CompLevel_limited_profile: {
278 return call_predicate_helper<CompLevel_none>(i, b, 1.0);
279 }
280 case CompLevel_full_profile: {
281 return call_predicate_helper<CompLevel_full_profile>(i, b, 1.0);
282 }
283 default:
284 return true;
285 }
286 }
288 // Determine is a method is mature.
289 bool SimpleThresholdPolicy::is_mature(Method* method) {
290 if (is_trivial(method)) return true;
291 MethodData* mdo = method->method_data();
292 if (mdo != NULL) {
293 int i = mdo->invocation_count();
294 int b = mdo->backedge_count();
295 double k = ProfileMaturityPercentage / 100.0;
296 return call_predicate_helper<CompLevel_full_profile>(i, b, k) ||
297 loop_predicate_helper<CompLevel_full_profile>(i, b, k);
298 }
299 return false;
300 }
302 // Common transition function. Given a predicate determines if a method should transition to another level.
303 CompLevel SimpleThresholdPolicy::common(Predicate p, Method* method, CompLevel cur_level) {
304 CompLevel next_level = cur_level;
305 int i = method->invocation_count();
306 int b = method->backedge_count();
308 if (is_trivial(method)) {
309 next_level = CompLevel_simple;
310 } else {
311 switch(cur_level) {
312 case CompLevel_none:
313 // If we were at full profile level, would we switch to full opt?
314 if (common(p, method, CompLevel_full_profile) == CompLevel_full_optimization) {
315 next_level = CompLevel_full_optimization;
316 } else if ((this->*p)(i, b, cur_level)) {
317 next_level = CompLevel_full_profile;
318 }
319 break;
320 case CompLevel_limited_profile:
321 case CompLevel_full_profile:
322 {
323 MethodData* mdo = method->method_data();
324 if (mdo != NULL) {
325 if (mdo->would_profile()) {
326 int mdo_i = mdo->invocation_count_delta();
327 int mdo_b = mdo->backedge_count_delta();
328 if ((this->*p)(mdo_i, mdo_b, cur_level)) {
329 next_level = CompLevel_full_optimization;
330 }
331 } else {
332 next_level = CompLevel_full_optimization;
333 }
334 }
335 }
336 break;
337 }
338 }
339 return MIN2(next_level, (CompLevel)TieredStopAtLevel);
340 }
342 // Determine if a method should be compiled with a normal entry point at a different level.
343 CompLevel SimpleThresholdPolicy::call_event(Method* method, CompLevel cur_level) {
344 CompLevel osr_level = MIN2((CompLevel) method->highest_osr_comp_level(),
345 common(&SimpleThresholdPolicy::loop_predicate, method, cur_level));
346 CompLevel next_level = common(&SimpleThresholdPolicy::call_predicate, method, cur_level);
348 // If OSR method level is greater than the regular method level, the levels should be
349 // equalized by raising the regular method level in order to avoid OSRs during each
350 // invocation of the method.
351 if (osr_level == CompLevel_full_optimization && cur_level == CompLevel_full_profile) {
352 MethodData* mdo = method->method_data();
353 guarantee(mdo != NULL, "MDO should not be NULL");
354 if (mdo->invocation_count() >= 1) {
355 next_level = CompLevel_full_optimization;
356 }
357 } else {
358 next_level = MAX2(osr_level, next_level);
359 }
361 return next_level;
362 }
364 // Determine if we should do an OSR compilation of a given method.
365 CompLevel SimpleThresholdPolicy::loop_event(Method* method, CompLevel cur_level) {
366 CompLevel next_level = common(&SimpleThresholdPolicy::loop_predicate, method, cur_level);
367 if (cur_level == CompLevel_none) {
368 // If there is a live OSR method that means that we deopted to the interpreter
369 // for the transition.
370 CompLevel osr_level = MIN2((CompLevel)method->highest_osr_comp_level(), next_level);
371 if (osr_level > CompLevel_none) {
372 return osr_level;
373 }
374 }
375 return next_level;
376 }
379 // Handle the invocation event.
380 void SimpleThresholdPolicy::method_invocation_event(methodHandle mh, methodHandle imh,
381 CompLevel level, nmethod* nm, JavaThread* thread) {
382 if (is_compilation_enabled() && !CompileBroker::compilation_is_in_queue(mh)) {
383 CompLevel next_level = call_event(mh(), level);
384 if (next_level != level) {
385 compile(mh, InvocationEntryBci, next_level, thread);
386 }
387 }
388 }
390 // Handle the back branch event. Notice that we can compile the method
391 // with a regular entry from here.
392 void SimpleThresholdPolicy::method_back_branch_event(methodHandle mh, methodHandle imh,
393 int bci, CompLevel level, nmethod* nm, JavaThread* thread) {
394 // If the method is already compiling, quickly bail out.
395 if (is_compilation_enabled() && !CompileBroker::compilation_is_in_queue(mh)) {
396 // Use loop event as an opportunity to also check there's been
397 // enough calls.
398 CompLevel cur_level = comp_level(mh());
399 CompLevel next_level = call_event(mh(), cur_level);
400 CompLevel next_osr_level = loop_event(mh(), level);
402 next_level = MAX2(next_level,
403 next_osr_level < CompLevel_full_optimization ? next_osr_level : cur_level);
404 bool is_compiling = false;
405 if (next_level != cur_level) {
406 compile(mh, InvocationEntryBci, next_level, thread);
407 is_compiling = true;
408 }
410 // Do the OSR version
411 if (!is_compiling && next_osr_level != level) {
412 compile(mh, bci, next_osr_level, thread);
413 }
414 }
415 }