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 // No need to set number of compiler threads if the VM is started with -Xint
138 assert ((c1_count() == 0) && (c2_count() == 0), "Must be initialized to 0");
139 if (Arguments::mode() != Arguments::_int) {
140 if (FLAG_IS_DEFAULT(CICompilerCount)) {
141 FLAG_SET_DEFAULT(CICompilerCount, 3);
142 }
143 int count = CICompilerCount;
144 if (CICompilerCountPerCPU) {
145 count = MAX2(log2_intptr(os::active_processor_count()), 1) * 3 / 2;
146 }
147 set_c1_count(MAX2(count / 3, 1));
148 set_c2_count(MAX2(count - count / 3, 1));
149 }
150 }
151
152 void SimpleThresholdPolicy::set_carry_if_necessary(InvocationCounter *counter) {
153 if (!counter->carry() && counter->count() > InvocationCounter::count_limit / 2) {
154 counter->set_carry_flag();
155 }
156 }
157
158 // Set carry flags on the counters if necessary
159 void SimpleThresholdPolicy::handle_counter_overflow(Method* method) {
160 MethodCounters *mcs = method->method_counters();
161 if (mcs != NULL) {
162 set_carry_if_necessary(mcs->invocation_counter());
163 set_carry_if_necessary(mcs->backedge_counter());
164 }
165 MethodData* mdo = method->method_data();
166 if (mdo != NULL) {
167 set_carry_if_necessary(mdo->invocation_counter());
168 set_carry_if_necessary(mdo->backedge_counter());
169 }
170 }
171
172 // Called with the queue locked and with at least one element
173 CompileTask* SimpleThresholdPolicy::select_task(CompileQueue* compile_queue) {
174 return compile_queue->first();
175 }
176
177 void SimpleThresholdPolicy::reprofile(ScopeDesc* trap_scope, bool is_osr) {
178 for (ScopeDesc* sd = trap_scope;; sd = sd->sender()) {
179 if (PrintTieredEvents) {
180 methodHandle mh(sd->method());
181 print_event(REPROFILE, mh, mh, InvocationEntryBci, CompLevel_none);
182 }
183 MethodData* mdo = sd->method()->method_data();
184 if (mdo != NULL) {
185 mdo->reset_start_counters();
186 }
187 if (sd->is_top()) break;
188 }
189 }
190
191 nmethod* SimpleThresholdPolicy::event(methodHandle method, methodHandle inlinee,
192 int branch_bci, int bci, CompLevel comp_level, nmethod* nm, JavaThread* thread) {
193 if (comp_level == CompLevel_none &&
194 JvmtiExport::can_post_interpreter_events() &&
195 thread->is_interp_only_mode()) {
196 return NULL;
197 }
198 nmethod *osr_nm = NULL;
199
200 handle_counter_overflow(method());
201 if (method() != inlinee()) {
202 handle_counter_overflow(inlinee());
203 }
204
205 if (PrintTieredEvents) {
206 print_event(bci == InvocationEntryBci ? CALL : LOOP, method, inlinee, bci, comp_level);
207 }
208
209 if (bci == InvocationEntryBci) {
210 method_invocation_event(method, inlinee, comp_level, nm, thread);
211 } else {
212 method_back_branch_event(method, inlinee, bci, comp_level, nm, thread);
213 // method == inlinee if the event originated in the main method
214 int highest_level = inlinee->highest_osr_comp_level();
215 if (highest_level > comp_level) {
216 osr_nm = inlinee->lookup_osr_nmethod_for(bci, highest_level, false);
217 }
218 }
219 return osr_nm;
220 }
221
222 // Check if the method can be compiled, change level if necessary
223 void SimpleThresholdPolicy::compile(methodHandle mh, int bci, CompLevel level, JavaThread* thread) {
224 assert(level <= TieredStopAtLevel, "Invalid compilation level");
225 if (level == CompLevel_none) {
226 return;
227 }
228 // Check if the method can be compiled. If it cannot be compiled with C1, continue profiling
229 // in the interpreter and then compile with C2 (the transition function will request that,
230 // see common() ). If the method cannot be compiled with C2 but still can with C1, compile it with
231 // pure C1.
232 if (!can_be_compiled(mh, level)) {
233 if (level == CompLevel_full_optimization && can_be_compiled(mh, CompLevel_simple)) {
234 compile(mh, bci, CompLevel_simple, thread);
235 }
236 return;
237 }
238 if (bci != InvocationEntryBci && mh->is_not_osr_compilable(level)) {
239 return;
240 }
241 if (!CompileBroker::compilation_is_in_queue(mh, bci)) {
242 if (PrintTieredEvents) {
243 print_event(COMPILE, mh, mh, bci, level);
244 }
245 submit_compile(mh, bci, level, thread);
246 }
247 }
248
249 // Tell the broker to compile the method
250 void SimpleThresholdPolicy::submit_compile(methodHandle mh, int bci, CompLevel level, JavaThread* thread) {
251 int hot_count = (bci == InvocationEntryBci) ? mh->invocation_count() : mh->backedge_count();
252 CompileBroker::compile_method(mh, bci, level, mh, hot_count, "tiered", thread);
253 }
254
255 // Call and loop predicates determine whether a transition to a higher
256 // compilation level should be performed (pointers to predicate functions
257 // are passed to common() transition function).
258 bool SimpleThresholdPolicy::loop_predicate(int i, int b, CompLevel cur_level) {
259 switch(cur_level) {
260 case CompLevel_none:
261 case CompLevel_limited_profile: {
262 return loop_predicate_helper<CompLevel_none>(i, b, 1.0);
263 }
264 case CompLevel_full_profile: {
265 return loop_predicate_helper<CompLevel_full_profile>(i, b, 1.0);
266 }
267 default:
268 return true;
269 }
270 }
271
272 bool SimpleThresholdPolicy::call_predicate(int i, int b, CompLevel cur_level) {
273 switch(cur_level) {
274 case CompLevel_none:
275 case CompLevel_limited_profile: {
276 return call_predicate_helper<CompLevel_none>(i, b, 1.0);
277 }
278 case CompLevel_full_profile: {
279 return call_predicate_helper<CompLevel_full_profile>(i, b, 1.0);
280 }
281 default:
282 return true;
283 }
284 }
285
286 // Determine is a method is mature.
287 bool SimpleThresholdPolicy::is_mature(Method* method) {
288 if (is_trivial(method)) return true;
289 MethodData* mdo = method->method_data();
290 if (mdo != NULL) {
291 int i = mdo->invocation_count();
292 int b = mdo->backedge_count();
293 double k = ProfileMaturityPercentage / 100.0;
294 return call_predicate_helper<CompLevel_full_profile>(i, b, k) ||
295 loop_predicate_helper<CompLevel_full_profile>(i, b, k);
296 }
297 return false;
298 }
299
300 // Common transition function. Given a predicate determines if a method should transition to another level.
301 CompLevel SimpleThresholdPolicy::common(Predicate p, Method* method, CompLevel cur_level) {
302 CompLevel next_level = cur_level;
303 int i = method->invocation_count();
304 int b = method->backedge_count();
305
306 if (is_trivial(method)) {
307 next_level = CompLevel_simple;
308 } else {
309 switch(cur_level) {
310 case CompLevel_none:
311 // If we were at full profile level, would we switch to full opt?
312 if (common(p, method, CompLevel_full_profile) == CompLevel_full_optimization) {
313 next_level = CompLevel_full_optimization;
314 } else if ((this->*p)(i, b, cur_level)) {
315 next_level = CompLevel_full_profile;
316 }
317 break;
318 case CompLevel_limited_profile:
319 case CompLevel_full_profile:
320 {
321 MethodData* mdo = method->method_data();
322 if (mdo != NULL) {
323 if (mdo->would_profile()) {
324 int mdo_i = mdo->invocation_count_delta();
325 int mdo_b = mdo->backedge_count_delta();
326 if ((this->*p)(mdo_i, mdo_b, cur_level)) {
327 next_level = CompLevel_full_optimization;
328 }
329 } else {
330 next_level = CompLevel_full_optimization;
331 }
332 }
333 }
334 break;
335 }
336 }
337 return MIN2(next_level, (CompLevel)TieredStopAtLevel);
338 }
339
340 // Determine if a method should be compiled with a normal entry point at a different level.
341 CompLevel SimpleThresholdPolicy::call_event(Method* method, CompLevel cur_level) {
342 CompLevel osr_level = MIN2((CompLevel) method->highest_osr_comp_level(),
343 common(&SimpleThresholdPolicy::loop_predicate, method, cur_level));
344 CompLevel next_level = common(&SimpleThresholdPolicy::call_predicate, method, cur_level);
345
346 // If OSR method level is greater than the regular method level, the levels should be
347 // equalized by raising the regular method level in order to avoid OSRs during each
348 // invocation of the method.
349 if (osr_level == CompLevel_full_optimization && cur_level == CompLevel_full_profile) {
350 MethodData* mdo = method->method_data();
351 guarantee(mdo != NULL, "MDO should not be NULL");
352 if (mdo->invocation_count() >= 1) {
353 next_level = CompLevel_full_optimization;
354 }
355 } else {
356 next_level = MAX2(osr_level, next_level);
357 }
358
359 return next_level;
360 }
361
362 // Determine if we should do an OSR compilation of a given method.
363 CompLevel SimpleThresholdPolicy::loop_event(Method* method, CompLevel cur_level) {
364 CompLevel next_level = common(&SimpleThresholdPolicy::loop_predicate, method, cur_level);
365 if (cur_level == CompLevel_none) {
366 // If there is a live OSR method that means that we deopted to the interpreter
367 // for the transition.
368 CompLevel osr_level = MIN2((CompLevel)method->highest_osr_comp_level(), next_level);
369 if (osr_level > CompLevel_none) {
370 return osr_level;
371 }
372 }
373 return next_level;
374 }
375
376
377 // Handle the invocation event.
378 void SimpleThresholdPolicy::method_invocation_event(methodHandle mh, methodHandle imh,
379 CompLevel level, nmethod* nm, JavaThread* thread) {
380 if (is_compilation_enabled() && !CompileBroker::compilation_is_in_queue(mh, InvocationEntryBci)) {
381 CompLevel next_level = call_event(mh(), level);
382 if (next_level != level) {
383 compile(mh, InvocationEntryBci, next_level, thread);
384 }
385 }
386 }
387
388 // Handle the back branch event. Notice that we can compile the method
389 // with a regular entry from here.
390 void SimpleThresholdPolicy::method_back_branch_event(methodHandle mh, methodHandle imh,
391 int bci, CompLevel level, nmethod* nm, JavaThread* thread) {
392 // If the method is already compiling, quickly bail out.
393 if (is_compilation_enabled() && !CompileBroker::compilation_is_in_queue(mh, bci)) {
394 // Use loop event as an opportinity to also check there's been
395 // enough calls.
396 CompLevel cur_level = comp_level(mh());
397 CompLevel next_level = call_event(mh(), cur_level);
398 CompLevel next_osr_level = loop_event(mh(), level);
399
400 next_level = MAX2(next_level,
401 next_osr_level < CompLevel_full_optimization ? next_osr_level : cur_level);
402 bool is_compiling = false;
403 if (next_level != cur_level) {
404 compile(mh, InvocationEntryBci, next_level, thread);
405 is_compiling = true;
406 }
407
408 // Do the OSR version
409 if (!is_compiling && next_osr_level != level) {
410 compile(mh, bci, next_osr_level, thread);
411 }
412 }
413 }