1 /*
2 * Copyright (c) 2010, 2013, 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
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"
32
33
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 }
53
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();
58
59 ttyLocker tty_lock;
60 tty->print("%lf: [", os::elapsedTime());
61
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 }
87
88 tty->print(" level=%d ", level);
89
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));
100
101 print_specific(type, mh, imh, bci, level);
102
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 }
135
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 - count / 3, 1));
146 }
147
148 void SimpleThresholdPolicy::set_carry_if_necessary(InvocationCounter *counter) {
149 if (!counter->carry() && counter->count() > InvocationCounter::count_limit / 2) {
150 counter->set_carry_flag();
151 }
152 }
153
154 // Set carry flags on the counters if necessary
155 void SimpleThresholdPolicy::handle_counter_overflow(Method* method) {
156 MethodCounters *mcs = method->method_counters();
157 if (mcs != NULL) {
158 set_carry_if_necessary(mcs->invocation_counter());
159 set_carry_if_necessary(mcs->backedge_counter());
160 }
161 MethodData* mdo = method->method_data();
162 if (mdo != NULL) {
163 set_carry_if_necessary(mdo->invocation_counter());
164 set_carry_if_necessary(mdo->backedge_counter());
165 }
166 }
167
168 // Called with the queue locked and with at least one element
169 CompileTask* SimpleThresholdPolicy::select_task(CompileQueue* compile_queue) {
170 return compile_queue->first();
171 }
172
173 void SimpleThresholdPolicy::reprofile(ScopeDesc* trap_scope, bool is_osr) {
174 for (ScopeDesc* sd = trap_scope;; sd = sd->sender()) {
175 if (PrintTieredEvents) {
176 methodHandle mh(sd->method());
177 print_event(REPROFILE, mh, mh, InvocationEntryBci, CompLevel_none);
178 }
179 MethodData* mdo = sd->method()->method_data();
180 if (mdo != NULL) {
181 mdo->reset_start_counters();
182 }
183 if (sd->is_top()) break;
184 }
185 }
186
187 nmethod* SimpleThresholdPolicy::event(methodHandle method, methodHandle inlinee,
188 int branch_bci, int bci, CompLevel comp_level, nmethod* nm, JavaThread* thread) {
189 if (comp_level == CompLevel_none &&
190 JvmtiExport::can_post_interpreter_events() &&
191 thread->is_interp_only_mode()) {
192 return NULL;
193 }
194 nmethod *osr_nm = NULL;
195
196 handle_counter_overflow(method());
197 if (method() != inlinee()) {
198 handle_counter_overflow(inlinee());
199 }
200
201 if (PrintTieredEvents) {
202 print_event(bci == InvocationEntryBci ? CALL : LOOP, method, inlinee, bci, comp_level);
203 }
204
205 if (bci == InvocationEntryBci) {
206 method_invocation_event(method, inlinee, comp_level, nm, thread);
207 } else {
208 method_back_branch_event(method, inlinee, bci, comp_level, nm, thread);
209 // method == inlinee if the event originated in the main method
210 int highest_level = inlinee->highest_osr_comp_level();
211 if (highest_level > comp_level) {
212 osr_nm = inlinee->lookup_osr_nmethod_for(bci, highest_level, false);
213 }
214 }
215 return osr_nm;
216 }
217
218 // Check if the method can be compiled, change level if necessary
219 void SimpleThresholdPolicy::compile(methodHandle mh, int bci, CompLevel level, JavaThread* thread) {
220 assert(level <= TieredStopAtLevel, "Invalid compilation level - level too large");
221 assert(level >= TieredStartAtLevel, "Invalid compilation level - level too small");
222 if (level == CompLevel_none) {
223 return;
224 }
225 // Check if the method can be compiled. If it cannot be compiled with C1, continue profiling
226 // in the interpreter and then compile with C2 (the transition function will request that,
227 // see common() ). If the method cannot be compiled with C2 but still can with C1, compile it with
228 // pure C1.
229 if (!can_be_compiled(mh, level)) {
230 if (level == CompLevel_full_optimization && can_be_compiled(mh, CompLevel_simple)) {
231 compile(mh, bci, CompLevel_simple, thread);
232 }
233 return;
234 }
235 if (bci != InvocationEntryBci && mh->is_not_osr_compilable(level)) {
236 return;
237 }
238 if (!CompileBroker::compilation_is_in_queue(mh, bci)) {
239 if (PrintTieredEvents) {
240 print_event(COMPILE, mh, mh, bci, level);
241 }
242 submit_compile(mh, bci, level, thread);
243 }
244 }
245
246 // Tell the broker to compile the method
247 void SimpleThresholdPolicy::submit_compile(methodHandle mh, int bci, CompLevel level, JavaThread* thread) {
248 int hot_count = (bci == InvocationEntryBci) ? mh->invocation_count() : mh->backedge_count();
249 CompileBroker::compile_method(mh, bci, level, mh, hot_count, "tiered", thread);
250 }
251
252 // Call and loop predicates determine whether a transition to a higher
253 // compilation level should be performed (pointers to predicate functions
254 // are passed to common() transition function).
255 bool SimpleThresholdPolicy::loop_predicate(int i, int b, CompLevel cur_level) {
256 switch(cur_level) {
257 case CompLevel_none:
258 case CompLevel_limited_profile: {
259 return loop_predicate_helper<CompLevel_none>(i, b, 1.0);
260 }
261 case CompLevel_full_profile: {
262 return loop_predicate_helper<CompLevel_full_profile>(i, b, 1.0);
263 }
264 default:
265 return true;
266 }
267 }
268
269 bool SimpleThresholdPolicy::call_predicate(int i, int b, CompLevel cur_level) {
270 switch(cur_level) {
271 case CompLevel_none:
272 case CompLevel_limited_profile: {
273 return call_predicate_helper<CompLevel_none>(i, b, 1.0);
274 }
275 case CompLevel_full_profile: {
276 return call_predicate_helper<CompLevel_full_profile>(i, b, 1.0);
277 }
278 default:
279 return true;
280 }
281 }
282
283 // Determine is a method is mature.
284 bool SimpleThresholdPolicy::is_mature(Method* method) {
285 if (is_trivial(method)) return true;
286 MethodData* mdo = method->method_data();
287 if (mdo != NULL) {
288 int i = mdo->invocation_count();
289 int b = mdo->backedge_count();
290 double k = ProfileMaturityPercentage / 100.0;
291 return call_predicate_helper<CompLevel_full_profile>(i, b, k) ||
292 loop_predicate_helper<CompLevel_full_profile>(i, b, k);
293 }
294 return false;
295 }
296
297 // Common transition function. Given a predicate determines if a method should transition to another level.
298 CompLevel SimpleThresholdPolicy::common(Predicate p, Method* method, CompLevel cur_level) {
299 CompLevel next_level = cur_level;
300 int i = method->invocation_count();
301 int b = method->backedge_count();
302
303 if (is_trivial(method)) {
304 next_level = CompLevel_simple;
305 } else {
306 switch(cur_level) {
307 case CompLevel_none:
308 // If we were at full profile level, would we switch to full opt?
309 if (common(p, method, CompLevel_full_profile) == CompLevel_full_optimization) {
310 next_level = CompLevel_full_optimization;
311 } else if ((this->*p)(i, b, cur_level)) {
312 next_level = CompLevel_full_profile;
313 }
314 break;
315 case CompLevel_limited_profile:
316 case CompLevel_full_profile:
317 {
318 MethodData* mdo = method->method_data();
319 if (mdo != NULL) {
320 if (mdo->would_profile()) {
321 int mdo_i = mdo->invocation_count_delta();
322 int mdo_b = mdo->backedge_count_delta();
323 if ((this->*p)(mdo_i, mdo_b, cur_level)) {
324 next_level = CompLevel_full_optimization;
325 }
326 } else {
327 next_level = CompLevel_full_optimization;
328 }
329 }
330 }
331 break;
332 }
333 }
334 next_level = MIN2(next_level, (CompLevel)TieredStopAtLevel);
335 return MAX2(next_level, (CompLevel)TieredStartAtLevel);
336 }
337
338 // Determine if a method should be compiled with a normal entry point at a different level.
339 CompLevel SimpleThresholdPolicy::call_event(Method* method, CompLevel cur_level) {
340 CompLevel osr_level = MIN2((CompLevel) method->highest_osr_comp_level(),
341 common(&SimpleThresholdPolicy::loop_predicate, method, cur_level));
342 CompLevel next_level = common(&SimpleThresholdPolicy::call_predicate, method, cur_level);
343
344 // If OSR method level is greater than the regular method level, the levels should be
345 // equalized by raising the regular method level in order to avoid OSRs during each
346 // invocation of the method.
347 if (osr_level == CompLevel_full_optimization && cur_level == CompLevel_full_profile) {
348 MethodData* mdo = method->method_data();
349 guarantee(mdo != NULL, "MDO should not be NULL");
350 if (mdo->invocation_count() >= 1) {
351 next_level = CompLevel_full_optimization;
352 }
353 } else {
354 next_level = MAX2(osr_level, next_level);
355 }
356
357 return next_level;
358 }
359
360 // Determine if we should do an OSR compilation of a given method.
361 CompLevel SimpleThresholdPolicy::loop_event(Method* method, CompLevel cur_level) {
362 CompLevel next_level = common(&SimpleThresholdPolicy::loop_predicate, method, cur_level);
363 if (cur_level == CompLevel_none) {
364 // If there is a live OSR method that means that we deopted to the interpreter
365 // for the transition.
366 CompLevel osr_level = MIN2((CompLevel)method->highest_osr_comp_level(), next_level);
367 if (osr_level > CompLevel_none) {
368 return osr_level;
369 }
370 }
371 return next_level;
372 }
373
374
375 // Handle the invocation event.
376 void SimpleThresholdPolicy::method_invocation_event(methodHandle mh, methodHandle imh,
377 CompLevel level, nmethod* nm, JavaThread* thread) {
378 if (is_compilation_enabled() && !CompileBroker::compilation_is_in_queue(mh, InvocationEntryBci)) {
379 CompLevel next_level = call_event(mh(), level);
380 if (next_level != level) {
381 compile(mh, InvocationEntryBci, next_level, thread);
382 }
383 }
384 }
385
386 // Handle the back branch event. Notice that we can compile the method
387 // with a regular entry from here.
388 void SimpleThresholdPolicy::method_back_branch_event(methodHandle mh, methodHandle imh,
389 int bci, CompLevel level, nmethod* nm, JavaThread* thread) {
390 // If the method is already compiling, quickly bail out.
391 if (is_compilation_enabled() && !CompileBroker::compilation_is_in_queue(mh, bci)) {
392 // Use loop event as an opportinity to also check there's been
393 // enough calls.
394 CompLevel cur_level = comp_level(mh());
395 CompLevel next_level = call_event(mh(), cur_level);
396 CompLevel next_osr_level = loop_event(mh(), level);
397
398 next_level = MAX2(next_level,
399 next_osr_level < CompLevel_full_optimization ? next_osr_level : cur_level);
400 bool is_compiling = false;
401 if (next_level != cur_level) {
402 compile(mh, InvocationEntryBci, next_level, thread);
403 is_compiling = true;
404 }
405
406 // Do the OSR version
407 if (!is_compiling && next_osr_level != level) {
408 compile(mh, bci, next_osr_level, thread);
409 }
410 }
411 }