157 * - TieredRateUpdateMinTime and TieredRateUpdateMaxTime are parameters of the rate computation.
158 * Basically, the rate is not computed more frequently than TieredRateUpdateMinTime and is considered
159 * to be zero if no events occurred in TieredRateUpdateMaxTime.
160 */
161
162
163 class AdvancedThresholdPolicy : public SimpleThresholdPolicy {
164 jlong _start_time;
165
166 // Call and loop predicates determine whether a transition to a higher compilation
167 // level should be performed (pointers to predicate functions are passed to common().
168 // Predicates also take compiler load into account.
169 typedef bool (AdvancedThresholdPolicy::*Predicate)(int i, int b, CompLevel cur_level, Method* method);
170 bool call_predicate(int i, int b, CompLevel cur_level, Method* method);
171 bool loop_predicate(int i, int b, CompLevel cur_level, Method* method);
172 // Common transition function. Given a predicate determines if a method should transition to another level.
173 CompLevel common(Predicate p, Method* method, CompLevel cur_level, bool disable_feedback = false);
174 // Transition functions.
175 // call_event determines if a method should be compiled at a different
176 // level with a regular invocation entry.
177 CompLevel call_event(Method* method, CompLevel cur_level);
178 // loop_event checks if a method should be OSR compiled at a different
179 // level.
180 CompLevel loop_event(Method* method, CompLevel cur_level);
181 // Has a method been long around?
182 // We don't remove old methods from the compile queue even if they have
183 // very low activity (see select_task()).
184 inline bool is_old(Method* method);
185 // Was a given method inactive for a given number of milliseconds.
186 // If it is, we would remove it from the queue (see select_task()).
187 inline bool is_stale(jlong t, jlong timeout, Method* m);
188 // Compute the weight of the method for the compilation scheduling
189 inline double weight(Method* method);
190 // Apply heuristics and return true if x should be compiled before y
191 inline bool compare_methods(Method* x, Method* y);
192 // Compute event rate for a given method. The rate is the number of event (invocations + backedges)
193 // per millisecond.
194 inline void update_rate(jlong t, Method* m);
195 // Compute threshold scaling coefficient
196 inline double threshold_scale(CompLevel level, int feedback_k);
197 // If a method is old enough and is still in the interpreter we would want to
198 // start profiling without waiting for the compiled method to arrive. This function
199 // determines whether we should do that.
200 inline bool should_create_mdo(Method* method, CompLevel cur_level);
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157 * - TieredRateUpdateMinTime and TieredRateUpdateMaxTime are parameters of the rate computation.
158 * Basically, the rate is not computed more frequently than TieredRateUpdateMinTime and is considered
159 * to be zero if no events occurred in TieredRateUpdateMaxTime.
160 */
161
162
163 class AdvancedThresholdPolicy : public SimpleThresholdPolicy {
164 jlong _start_time;
165
166 // Call and loop predicates determine whether a transition to a higher compilation
167 // level should be performed (pointers to predicate functions are passed to common().
168 // Predicates also take compiler load into account.
169 typedef bool (AdvancedThresholdPolicy::*Predicate)(int i, int b, CompLevel cur_level, Method* method);
170 bool call_predicate(int i, int b, CompLevel cur_level, Method* method);
171 bool loop_predicate(int i, int b, CompLevel cur_level, Method* method);
172 // Common transition function. Given a predicate determines if a method should transition to another level.
173 CompLevel common(Predicate p, Method* method, CompLevel cur_level, bool disable_feedback = false);
174 // Transition functions.
175 // call_event determines if a method should be compiled at a different
176 // level with a regular invocation entry.
177 CompLevel call_event(Method* method, CompLevel cur_level, JavaThread * thread);
178 // loop_event checks if a method should be OSR compiled at a different
179 // level.
180 CompLevel loop_event(Method* method, CompLevel cur_level, JavaThread * thread);
181 // Has a method been long around?
182 // We don't remove old methods from the compile queue even if they have
183 // very low activity (see select_task()).
184 inline bool is_old(Method* method);
185 // Was a given method inactive for a given number of milliseconds.
186 // If it is, we would remove it from the queue (see select_task()).
187 inline bool is_stale(jlong t, jlong timeout, Method* m);
188 // Compute the weight of the method for the compilation scheduling
189 inline double weight(Method* method);
190 // Apply heuristics and return true if x should be compiled before y
191 inline bool compare_methods(Method* x, Method* y);
192 // Compute event rate for a given method. The rate is the number of event (invocations + backedges)
193 // per millisecond.
194 inline void update_rate(jlong t, Method* m);
195 // Compute threshold scaling coefficient
196 inline double threshold_scale(CompLevel level, int feedback_k);
197 // If a method is old enough and is still in the interpreter we would want to
198 // start profiling without waiting for the compiled method to arrive. This function
199 // determines whether we should do that.
200 inline bool should_create_mdo(Method* method, CompLevel cur_level);
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