68 T* value = nullptr;
69 if (n != nullptr) {
70 value = n->value();
71 delete n;
72 }
73 return value;
74 }
75 public:
76 Queue() : _head(nullptr), _tail(nullptr) { }
77 void push(T* value, Monitor* lock, TRAPS) {
78 MonitorLocker locker(THREAD, lock);
79 push_unlocked(value);
80 locker.notify_all();
81 }
82
83 bool is_empty_unlocked() const { return _head == nullptr; }
84
85 T* pop(Monitor* lock, TRAPS) {
86 MonitorLocker locker(THREAD, lock);
87 while(is_empty_unlocked() && !CompileBroker::is_compilation_disabled_forever()) {
88 locker.wait();
89 }
90 T* value = pop_unlocked();
91 return value;
92 }
93
94 T* try_pop(Monitor* lock, TRAPS) {
95 MonitorLocker locker(THREAD, lock);
96 T* value = nullptr;
97 if (!is_empty_unlocked()) {
98 value = pop_unlocked();
99 }
100 return value;
101 }
102
103 void print_on(outputStream* st);
104 };
105 } // namespace CompilationPolicyUtils
106
107 class CompileTask;
229 *
230 * - TieredStopAtLevel, is used mostly for testing. It allows to bypass the policy logic and stick
231 * to a given level. For example it's useful to set TieredStopAtLevel = 1 in order to compile everything
232 * with pure c1.
233 *
234 * - Tier0ProfilingStartPercentage allows the interpreter to start profiling when the inequalities in the
235 * 0->3 predicate are already exceeded by the given percentage but the level 3 version of the
236 * method is still not ready. We can even go directly from level 0 to 4 if c1 doesn't produce a compiled
237 * version in time. This reduces the overall transition to level 4 and decreases the startup time.
238 * Note that this behavior is also guarded by the Tier3Delay mechanism: when the c2 queue is too long
239 * these is not reason to start profiling prematurely.
240 *
241 * - TieredRateUpdateMinTime and TieredRateUpdateMaxTime are parameters of the rate computation.
242 * Basically, the rate is not computed more frequently than TieredRateUpdateMinTime and is considered
243 * to be zero if no events occurred in TieredRateUpdateMaxTime.
244 */
245
246 class CompilationPolicy : AllStatic {
247 friend class CallPredicate;
248 friend class LoopPredicate;
249
250 typedef CompilationPolicyUtils::Queue<InstanceKlass> TrainingReplayQueue;
251
252 static int64_t _start_time;
253 static int _c1_count, _c2_count;
254 static double _increase_threshold_at_ratio;
255 static TrainingReplayQueue _training_replay_queue;
256
257 // Set carry flags in the counters (in Method* and MDO).
258 inline static void handle_counter_overflow(const methodHandle& method);
259 #ifdef ASSERT
260 // Verify that a level is consistent with the compilation mode
261 static bool verify_level(CompLevel level);
262 #endif
263 // Clamp the request level according to various constraints.
264 inline static CompLevel limit_level(CompLevel level);
265 // Common transition function. Given a predicate determines if a method should transition to another level.
266 template<typename Predicate>
267 static CompLevel common(const methodHandle& method, CompLevel cur_level, JavaThread* THREAD, bool disable_feedback = false);
268
269 template<typename Predicate>
270 static CompLevel transition_from_none(const methodHandle& method, CompLevel cur_level, bool delay_profiling, bool disable_feedback);
271 template<typename Predicate>
272 static CompLevel transition_from_limited_profile(const methodHandle& method, CompLevel cur_level, bool delay_profiling, bool disable_feedback);
273 template<typename Predicate>
283 // Transition functions.
284 // call_event determines if a method should be compiled at a different
285 // level with a regular invocation entry.
286 static CompLevel call_event(const methodHandle& method, CompLevel cur_level, JavaThread* THREAD);
287 // loop_event checks if a method should be OSR compiled at a different
288 // level.
289 static CompLevel loop_event(const methodHandle& method, CompLevel cur_level, JavaThread* THREAD);
290 static void print_counters(const char* prefix, Method* m);
291 static void print_training_data(const char* prefix, Method* method);
292 // Has a method been long around?
293 // We don't remove old methods from the compile queue even if they have
294 // very low activity (see select_task()).
295 inline static bool is_old(const methodHandle& method);
296 // Was a given method inactive for a given number of milliseconds.
297 // If it is, we would remove it from the queue (see select_task()).
298 inline static bool is_stale(int64_t t, int64_t timeout, const methodHandle& method);
299 // Compute the weight of the method for the compilation scheduling
300 inline static double weight(Method* method);
301 // Apply heuristics and return true if x should be compiled before y
302 inline static bool compare_methods(Method* x, Method* y);
303 // Compute event rate for a given method. The rate is the number of event (invocations + backedges)
304 // per millisecond.
305 inline static void update_rate(int64_t t, const methodHandle& method);
306 // Compute threshold scaling coefficient
307 inline static double threshold_scale(CompLevel level, int feedback_k);
308 // If a method is old enough and is still in the interpreter we would want to
309 // start profiling without waiting for the compiled method to arrive. This function
310 // determines whether we should do that.
311 inline static bool should_create_mdo(const methodHandle& method, CompLevel cur_level);
312 // Create MDO if necessary.
313 static void create_mdo(const methodHandle& mh, JavaThread* THREAD);
314 // Is method profiled enough?
315 static bool is_method_profiled(const methodHandle& method);
316
317 static void set_c1_count(int x) { _c1_count = x; }
318 static void set_c2_count(int x) { _c2_count = x; }
319
320 enum EventType { CALL, LOOP, COMPILE, FORCE_COMPILE, FORCE_RECOMPILE, REMOVE_FROM_QUEUE, UPDATE_IN_QUEUE, REPROFILE, MAKE_NOT_ENTRANT };
321 static void print_event(EventType type, Method* m, Method* im, int bci, CompLevel level);
322 // Check if the method can be compiled, change level if necessary
323 static void compile(const methodHandle& mh, int bci, CompLevel level, TRAPS);
324 // Simple methods are as good being compiled with C1 as C2.
325 // This function tells if it's such a function.
326 inline static bool is_trivial(const methodHandle& method);
327 // Force method to be compiled at CompLevel_simple?
328 inline static bool force_comp_at_level_simple(const methodHandle& method);
329
330 // Get a compilation level for a given method.
331 static CompLevel comp_level(Method* method);
332 static void method_invocation_event(const methodHandle& method, const methodHandle& inlinee,
333 CompLevel level, nmethod* nm, TRAPS);
334 static void method_back_branch_event(const methodHandle& method, const methodHandle& inlinee,
335 int bci, CompLevel level, nmethod* nm, TRAPS);
336
337 static void set_increase_threshold_at_ratio() { _increase_threshold_at_ratio = 100 / (100 - (double)IncreaseFirstTierCompileThresholdAt); }
338 static void set_start_time(int64_t t) { _start_time = t; }
339 static int64_t start_time() { return _start_time; }
340
341 // m must be compiled before executing it
342 static bool must_be_compiled(const methodHandle& m, int comp_level = CompLevel_any);
343 static void maybe_compile_early(const methodHandle& m, TRAPS);
344 static void replay_training_at_init_impl(InstanceKlass* klass, TRAPS);
345 public:
346 static int min_invocations() { return Tier4MinInvocationThreshold; }
347 static int c1_count() { return _c1_count; }
348 static int c2_count() { return _c2_count; }
349 static int compiler_count(CompLevel comp_level);
350 // If m must_be_compiled then request a compilation from the CompileBroker.
351 // This supports the -Xcomp option.
352 static void compile_if_required(const methodHandle& m, TRAPS);
353
354 static void replay_training_at_init(InstanceKlass* klass, TRAPS);
355 static void replay_training_at_init_loop(TRAPS);
356
357 // m is allowed to be compiled
358 static bool can_be_compiled(const methodHandle& m, int comp_level = CompLevel_any);
359 // m is allowed to be osr compiled
360 static bool can_be_osr_compiled(const methodHandle& m, int comp_level = CompLevel_any);
361 static bool is_compilation_enabled();
362
363 static CompileTask* select_task_helper(CompileQueue* compile_queue);
364 // Return initial compile level to use with Xcomp (depends on compilation mode).
365 static void reprofile(ScopeDesc* trap_scope, bool is_osr);
366 static nmethod* event(const methodHandle& method, const methodHandle& inlinee,
367 int branch_bci, int bci, CompLevel comp_level, nmethod* nm, TRAPS);
368 // Select task is called by CompileBroker. We should return a task or nullptr.
369 static CompileTask* select_task(CompileQueue* compile_queue, JavaThread* THREAD);
370 // Tell the runtime if we think a given method is adequately profiled.
371 static bool is_mature(MethodData* mdo);
372 // Initialize: set compiler thread count
373 static void initialize();
374 static bool should_not_inline(ciEnv* env, ciMethod* callee);
375
376 // Return desired initial compilation level for Xcomp
377 static CompLevel initial_compile_level(const methodHandle& method);
378 // Return highest level possible
379 static CompLevel highest_compile_level();
380 static void dump();
381 };
382
383 #endif // SHARE_COMPILER_COMPILATIONPOLICY_HPP
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68 T* value = nullptr;
69 if (n != nullptr) {
70 value = n->value();
71 delete n;
72 }
73 return value;
74 }
75 public:
76 Queue() : _head(nullptr), _tail(nullptr) { }
77 void push(T* value, Monitor* lock, TRAPS) {
78 MonitorLocker locker(THREAD, lock);
79 push_unlocked(value);
80 locker.notify_all();
81 }
82
83 bool is_empty_unlocked() const { return _head == nullptr; }
84
85 T* pop(Monitor* lock, TRAPS) {
86 MonitorLocker locker(THREAD, lock);
87 while(is_empty_unlocked() && !CompileBroker::is_compilation_disabled_forever()) {
88 locker.notify_all(); // notify that queue is empty
89 locker.wait();
90 }
91 T* value = pop_unlocked();
92 return value;
93 }
94
95 T* try_pop(Monitor* lock, TRAPS) {
96 MonitorLocker locker(THREAD, lock);
97 T* value = nullptr;
98 if (!is_empty_unlocked()) {
99 value = pop_unlocked();
100 }
101 return value;
102 }
103
104 void print_on(outputStream* st);
105 };
106 } // namespace CompilationPolicyUtils
107
108 class CompileTask;
230 *
231 * - TieredStopAtLevel, is used mostly for testing. It allows to bypass the policy logic and stick
232 * to a given level. For example it's useful to set TieredStopAtLevel = 1 in order to compile everything
233 * with pure c1.
234 *
235 * - Tier0ProfilingStartPercentage allows the interpreter to start profiling when the inequalities in the
236 * 0->3 predicate are already exceeded by the given percentage but the level 3 version of the
237 * method is still not ready. We can even go directly from level 0 to 4 if c1 doesn't produce a compiled
238 * version in time. This reduces the overall transition to level 4 and decreases the startup time.
239 * Note that this behavior is also guarded by the Tier3Delay mechanism: when the c2 queue is too long
240 * these is not reason to start profiling prematurely.
241 *
242 * - TieredRateUpdateMinTime and TieredRateUpdateMaxTime are parameters of the rate computation.
243 * Basically, the rate is not computed more frequently than TieredRateUpdateMinTime and is considered
244 * to be zero if no events occurred in TieredRateUpdateMaxTime.
245 */
246
247 class CompilationPolicy : AllStatic {
248 friend class CallPredicate;
249 friend class LoopPredicate;
250 friend class RecompilationPolicy;
251
252 typedef CompilationPolicyUtils::Queue<InstanceKlass> TrainingReplayQueue;
253
254 static int64_t _start_time;
255 static int _c1_count, _c2_count, _c3_count, _ac_count;
256 static double _increase_threshold_at_ratio;
257 static TrainingReplayQueue _training_replay_queue;
258
259 // Set carry flags in the counters (in Method* and MDO).
260 inline static void handle_counter_overflow(const methodHandle& method);
261 #ifdef ASSERT
262 // Verify that a level is consistent with the compilation mode
263 static bool verify_level(CompLevel level);
264 #endif
265 // Clamp the request level according to various constraints.
266 inline static CompLevel limit_level(CompLevel level);
267 // Common transition function. Given a predicate determines if a method should transition to another level.
268 template<typename Predicate>
269 static CompLevel common(const methodHandle& method, CompLevel cur_level, JavaThread* THREAD, bool disable_feedback = false);
270
271 template<typename Predicate>
272 static CompLevel transition_from_none(const methodHandle& method, CompLevel cur_level, bool delay_profiling, bool disable_feedback);
273 template<typename Predicate>
274 static CompLevel transition_from_limited_profile(const methodHandle& method, CompLevel cur_level, bool delay_profiling, bool disable_feedback);
275 template<typename Predicate>
285 // Transition functions.
286 // call_event determines if a method should be compiled at a different
287 // level with a regular invocation entry.
288 static CompLevel call_event(const methodHandle& method, CompLevel cur_level, JavaThread* THREAD);
289 // loop_event checks if a method should be OSR compiled at a different
290 // level.
291 static CompLevel loop_event(const methodHandle& method, CompLevel cur_level, JavaThread* THREAD);
292 static void print_counters(const char* prefix, Method* m);
293 static void print_training_data(const char* prefix, Method* method);
294 // Has a method been long around?
295 // We don't remove old methods from the compile queue even if they have
296 // very low activity (see select_task()).
297 inline static bool is_old(const methodHandle& method);
298 // Was a given method inactive for a given number of milliseconds.
299 // If it is, we would remove it from the queue (see select_task()).
300 inline static bool is_stale(int64_t t, int64_t timeout, const methodHandle& method);
301 // Compute the weight of the method for the compilation scheduling
302 inline static double weight(Method* method);
303 // Apply heuristics and return true if x should be compiled before y
304 inline static bool compare_methods(Method* x, Method* y);
305 inline static bool compare_tasks(CompileTask* x, CompileTask* y);
306 // Compute event rate for a given method. The rate is the number of event (invocations + backedges)
307 // per millisecond.
308 inline static void update_rate(int64_t t, const methodHandle& method);
309 // Compute threshold scaling coefficient
310 inline static double threshold_scale(CompLevel level, int feedback_k);
311 // If a method is old enough and is still in the interpreter we would want to
312 // start profiling without waiting for the compiled method to arrive. This function
313 // determines whether we should do that.
314 inline static bool should_create_mdo(const methodHandle& method, CompLevel cur_level);
315 // Create MDO if necessary.
316 static void create_mdo(const methodHandle& mh, JavaThread* THREAD);
317 // Is method profiled enough?
318 static bool is_method_profiled(const methodHandle& method);
319
320 static void set_c1_count(int x) { _c1_count = x; }
321 static void set_c2_count(int x) { _c2_count = x; }
322 static void set_c3_count(int x) { _c3_count = x; }
323 static void set_ac_count(int x) { _ac_count = x; }
324
325 enum EventType { CALL, LOOP, COMPILE, FORCE_COMPILE, FORCE_RECOMPILE, REMOVE_FROM_QUEUE, UPDATE_IN_QUEUE, REPROFILE, MAKE_NOT_ENTRANT };
326 static void print_event(EventType type, Method* m, Method* im, int bci, CompLevel level);
327 // Check if the method can be compiled, change level if necessary
328 static void compile(const methodHandle& mh, int bci, CompLevel level, TRAPS);
329 // Simple methods are as good being compiled with C1 as C2.
330 // This function tells if it's such a function.
331 inline static bool is_trivial(const methodHandle& method);
332 // Force method to be compiled at CompLevel_simple?
333 inline static bool force_comp_at_level_simple(const methodHandle& method);
334
335 // Get a compilation level for a given method.
336 static CompLevel comp_level(Method* method);
337 static void method_invocation_event(const methodHandle& method, const methodHandle& inlinee,
338 CompLevel level, nmethod* nm, TRAPS);
339 static void method_back_branch_event(const methodHandle& method, const methodHandle& inlinee,
340 int bci, CompLevel level, nmethod* nm, TRAPS);
341
342 static void set_increase_threshold_at_ratio() { _increase_threshold_at_ratio = 100 / (100 - (double)IncreaseFirstTierCompileThresholdAt); }
343 static void set_start_time(int64_t t) { _start_time = t; }
344 static int64_t start_time() { return _start_time; }
345
346 // m must be compiled before executing it
347 static bool must_be_compiled(const methodHandle& m, int comp_level = CompLevel_any);
348 static void maybe_compile_early(const methodHandle& m, TRAPS);
349 static void maybe_compile_early_after_init(const methodHandle& m, TRAPS);
350 static void replay_training_at_init_impl(InstanceKlass* klass, TRAPS);
351 public:
352 static int min_invocations() { return Tier4MinInvocationThreshold; }
353 static int c1_count() { return _c1_count; }
354 static int c2_count() { return _c2_count; }
355 static int c3_count() { return _c3_count; }
356 static int ac_count() { return _ac_count; }
357 static int compiler_count(CompLevel comp_level);
358 // If m must_be_compiled then request a compilation from the CompileBroker.
359 // This supports the -Xcomp option.
360 static void compile_if_required(const methodHandle& m, TRAPS);
361
362 static void flush_replay_training_at_init(TRAPS);
363 static void replay_training_at_init(InstanceKlass* klass, TRAPS);
364 static void replay_training_at_init_loop(TRAPS);
365
366 // m is allowed to be compiled
367 static bool can_be_compiled(const methodHandle& m, int comp_level = CompLevel_any);
368 // m is allowed to be osr compiled
369 static bool can_be_osr_compiled(const methodHandle& m, int comp_level = CompLevel_any);
370 static bool is_compilation_enabled();
371
372 static CompileTask* select_task_helper(CompileQueue* compile_queue);
373 // Return initial compile level to use with Xcomp (depends on compilation mode).
374 static void reprofile(ScopeDesc* trap_scope, bool is_osr);
375 static nmethod* event(const methodHandle& method, const methodHandle& inlinee,
376 int branch_bci, int bci, CompLevel comp_level, nmethod* nm, TRAPS);
377 // Select task is called by CompileBroker. We should return a task or nullptr.
378 static CompileTask* select_task(CompileQueue* compile_queue, JavaThread* THREAD);
379 // Tell the runtime if we think a given method is adequately profiled.
380 static bool is_mature(MethodData* mdo);
381 // Initialize: set compiler thread count
382 static void initialize();
383 static bool should_not_inline(ciEnv* env, ciMethod* callee);
384
385 // Return desired initial compilation level for Xcomp
386 static CompLevel initial_compile_level(const methodHandle& method);
387 // Return highest level possible
388 static CompLevel highest_compile_level();
389 static void dump();
390
391 static void sample_load_average();
392 static bool have_recompilation_work();
393 static bool recompilation_step(int step, TRAPS);
394 };
395
396 #endif // SHARE_COMPILER_COMPILATIONPOLICY_HPP
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