iveresov@2138: /*
iveresov@2138:  * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
iveresov@2138:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
iveresov@2138:  *
iveresov@2138:  * This code is free software; you can redistribute it and/or modify it
iveresov@2138:  * under the terms of the GNU General Public License version 2 only, as
iveresov@2138:  * published by the Free Software Foundation.
iveresov@2138:  *
iveresov@2138:  * This code is distributed in the hope that it will be useful, but WITHOUT
iveresov@2138:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
iveresov@2138:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
iveresov@2138:  * version 2 for more details (a copy is included in the LICENSE file that
iveresov@2138:  * accompanied this code).
iveresov@2138:  *
iveresov@2138:  * You should have received a copy of the GNU General Public License version
iveresov@2138:  * 2 along with this work; if not, write to the Free Software Foundation,
iveresov@2138:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
iveresov@2138:  *
iveresov@2138:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
iveresov@2138:  * or visit www.oracle.com if you need additional information or have any
iveresov@2138:  * questions.
iveresov@2138:  *
iveresov@2138:  */
iveresov@2138: 
iveresov@2138: # include "incls/_precompiled.incl"
iveresov@2138: # include "incls/_simpleThresholdPolicy.cpp.incl"
iveresov@2138: 
iveresov@2138: // Print an event.
iveresov@2138: void SimpleThresholdPolicy::print_event(EventType type, methodHandle mh, methodHandle imh,
iveresov@2138:                                         int bci, CompLevel level) {
iveresov@2138:   bool inlinee_event = mh() != imh();
iveresov@2138: 
iveresov@2138:   ttyLocker tty_lock;
iveresov@2138:   tty->print("%lf: [", os::elapsedTime());
iveresov@2138: 
iveresov@2138:   int invocation_count = mh->invocation_count();
iveresov@2138:   int backedge_count = mh->backedge_count();
iveresov@2138:   switch(type) {
iveresov@2138:   case CALL:
iveresov@2138:     tty->print("call");
iveresov@2138:     break;
iveresov@2138:   case LOOP:
iveresov@2138:     tty->print("loop");
iveresov@2138:     break;
iveresov@2138:   case COMPILE:
iveresov@2138:     tty->print("compile");
iveresov@2138:   }
iveresov@2138: 
iveresov@2138:   tty->print(" level: %d ", level);
iveresov@2138: 
iveresov@2138:   ResourceMark rm;
iveresov@2138:   char *method_name = mh->name_and_sig_as_C_string();
iveresov@2138:   tty->print("[%s", method_name);
iveresov@2138:   // We can have an inlinee, although currently we don't generate any notifications for the inlined methods.
iveresov@2138:   if (inlinee_event) {
iveresov@2138:     char *inlinee_name = imh->name_and_sig_as_C_string();
iveresov@2138:     tty->print(" [%s]] ", inlinee_name);
iveresov@2138:   }
iveresov@2138:   else tty->print("] ");
iveresov@2138:   tty->print("@%d queues: %d,%d", bci, CompileBroker::queue_size(CompLevel_full_profile),
iveresov@2138:                                        CompileBroker::queue_size(CompLevel_full_optimization));
iveresov@2138: 
iveresov@2138:   print_specific(type, mh, imh, bci, level);
iveresov@2138: 
iveresov@2138:   if (type != COMPILE) {
iveresov@2138:     methodDataHandle mdh = mh->method_data();
iveresov@2138:     int mdo_invocations = 0, mdo_backedges = 0;
iveresov@2138:     if (mdh() != NULL) {
iveresov@2138:       mdo_invocations = mdh->invocation_count();
iveresov@2138:       mdo_backedges = mdh->backedge_count();
iveresov@2138:     }
iveresov@2138:     tty->print(" total: %d,%d mdo: %d,%d",
iveresov@2138:                invocation_count, backedge_count,
iveresov@2138:                mdo_invocations, mdo_backedges);
iveresov@2138:     tty->print(" max levels: %d,%d",
iveresov@2138:                 mh->highest_comp_level(), mh->highest_osr_comp_level());
iveresov@2138:     if (inlinee_event) {
iveresov@2138:       tty->print(" inlinee max levels: %d,%d", imh->highest_comp_level(), imh->highest_osr_comp_level());
iveresov@2138:     }
iveresov@2138:     tty->print(" compilable: ");
iveresov@2138:     bool need_comma = false;
iveresov@2138:     if (!mh->is_not_compilable(CompLevel_full_profile)) {
iveresov@2138:       tty->print("c1");
iveresov@2138:       need_comma = true;
iveresov@2138:     }
iveresov@2138:     if (!mh->is_not_compilable(CompLevel_full_optimization)) {
iveresov@2138:       if (need_comma) tty->print(", ");
iveresov@2138:       tty->print("c2");
iveresov@2138:       need_comma = true;
iveresov@2138:     }
iveresov@2138:     if (!mh->is_not_osr_compilable()) {
iveresov@2138:       if (need_comma) tty->print(", ");
iveresov@2138:       tty->print("osr");
iveresov@2138:     }
iveresov@2138:     tty->print(" status:");
iveresov@2138:     if (mh->queued_for_compilation()) {
iveresov@2138:       tty->print(" in queue");
iveresov@2138:     } else tty->print(" idle");
iveresov@2138:   }
iveresov@2138:   tty->print_cr("]");
iveresov@2138: }
iveresov@2138: 
iveresov@2138: void SimpleThresholdPolicy::initialize() {
iveresov@2138:   if (FLAG_IS_DEFAULT(CICompilerCount)) {
iveresov@2138:     FLAG_SET_DEFAULT(CICompilerCount, 3);
iveresov@2138:   }
iveresov@2138:   int count = CICompilerCount;
iveresov@2138:   if (CICompilerCountPerCPU) {
iveresov@2138:     count = MAX2(log2_intptr(os::active_processor_count()), 1) * 3 / 2;
iveresov@2138:   }
iveresov@2138:   set_c1_count(MAX2(count / 3, 1));
iveresov@2138:   set_c2_count(MAX2(count - count / 3, 1));
iveresov@2138: }
iveresov@2138: 
iveresov@2138: void SimpleThresholdPolicy::set_carry_if_necessary(InvocationCounter *counter) {
iveresov@2138:   if (!counter->carry() && counter->count() > InvocationCounter::count_limit / 2) {
iveresov@2138:     counter->set_carry_flag();
iveresov@2138:   }
iveresov@2138: }
iveresov@2138: 
iveresov@2138: // Set carry flags on the counters if necessary
iveresov@2138: void SimpleThresholdPolicy::handle_counter_overflow(methodOop method) {
iveresov@2138:   set_carry_if_necessary(method->invocation_counter());
iveresov@2138:   set_carry_if_necessary(method->backedge_counter());
iveresov@2138:   methodDataOop mdo = method->method_data();
iveresov@2138:   if (mdo != NULL) {
iveresov@2138:     set_carry_if_necessary(mdo->invocation_counter());
iveresov@2138:     set_carry_if_necessary(mdo->backedge_counter());
iveresov@2138:   }
iveresov@2138: }
iveresov@2138: 
iveresov@2138: // Called with the queue locked and with at least one element
iveresov@2138: CompileTask* SimpleThresholdPolicy::select_task(CompileQueue* compile_queue) {
iveresov@2138:   return compile_queue->first();
iveresov@2138: }
iveresov@2138: 
iveresov@2138: nmethod* SimpleThresholdPolicy::event(methodHandle method, methodHandle inlinee,
iveresov@2138:                                       int branch_bci, int bci, CompLevel comp_level, TRAPS) {
iveresov@2138:   if (comp_level == CompLevel_none &&
iveresov@2138:       JvmtiExport::can_post_interpreter_events()) {
iveresov@2138:     assert(THREAD->is_Java_thread(), "Should be java thread");
iveresov@2138:     if (((JavaThread*)THREAD)->is_interp_only_mode()) {
iveresov@2138:       return NULL;
iveresov@2138:     }
iveresov@2138:   }
iveresov@2138:   nmethod *osr_nm = NULL;
iveresov@2138: 
iveresov@2138:   handle_counter_overflow(method());
iveresov@2138:   if (method() != inlinee()) {
iveresov@2138:     handle_counter_overflow(inlinee());
iveresov@2138:   }
iveresov@2138: 
iveresov@2138:   if (PrintTieredEvents) {
iveresov@2138:     print_event(bci == InvocationEntryBci ? CALL : LOOP, method, inlinee, bci, comp_level);
iveresov@2138:   }
iveresov@2138: 
iveresov@2138:   if (bci == InvocationEntryBci) {
iveresov@2138:     method_invocation_event(method, inlinee, comp_level, THREAD);
iveresov@2138:   } else {
iveresov@2138:     method_back_branch_event(method, inlinee, bci, comp_level, THREAD);
iveresov@2138:     int highest_level = method->highest_osr_comp_level();
iveresov@2138:     if (highest_level > comp_level) {
iveresov@2138:       osr_nm = method->lookup_osr_nmethod_for(bci, highest_level, false);
iveresov@2138:     }
iveresov@2138:   }
iveresov@2138:   return osr_nm;
iveresov@2138: }
iveresov@2138: 
iveresov@2138: // Check if the method can be compiled, change level if necessary
iveresov@2138: void SimpleThresholdPolicy::compile(methodHandle mh, int bci, CompLevel level, TRAPS) {
iveresov@2138:   // Take the given ceiling into the account.
iveresov@2138:   // NOTE: You can set it to 1 to get a pure C1 version.
iveresov@2138:   if ((CompLevel)TieredStopAtLevel < level) {
iveresov@2138:     level = (CompLevel)TieredStopAtLevel;
iveresov@2138:   }
iveresov@2138:   if (level == CompLevel_none) {
iveresov@2138:     return;
iveresov@2138:   }
iveresov@2138:   // Check if the method can be compiled, if not - try different levels.
iveresov@2138:   if (!can_be_compiled(mh, level)) {
iveresov@2138:     if (level < CompLevel_full_optimization && can_be_compiled(mh, CompLevel_full_optimization)) {
iveresov@2138:       compile(mh, bci, CompLevel_full_optimization, THREAD);
iveresov@2138:     }
iveresov@2138:     if (level == CompLevel_full_optimization && can_be_compiled(mh, CompLevel_simple)) {
iveresov@2138:         compile(mh, bci, CompLevel_simple, THREAD);
iveresov@2138:     }
iveresov@2138:     return;
iveresov@2138:   }
iveresov@2138:   if (bci != InvocationEntryBci && mh->is_not_osr_compilable()) {
iveresov@2138:     return;
iveresov@2138:   }
iveresov@2138:   if (PrintTieredEvents) {
iveresov@2138:     print_event(COMPILE, mh, mh, bci, level);
iveresov@2138:   }
iveresov@2138:   if (!CompileBroker::compilation_is_in_queue(mh, bci)) {
iveresov@2138:     submit_compile(mh, bci, level, THREAD);
iveresov@2138:   }
iveresov@2138: }
iveresov@2138: 
iveresov@2138: // Tell the broker to compile the method
iveresov@2138: void SimpleThresholdPolicy::submit_compile(methodHandle mh, int bci, CompLevel level, TRAPS) {
iveresov@2138:   int hot_count = (bci == InvocationEntryBci) ? mh->invocation_count() : mh->backedge_count();
iveresov@2138:   CompileBroker::compile_method(mh, bci, level, mh, hot_count, "tiered", THREAD);
iveresov@2138: }
iveresov@2138: 
iveresov@2138: // Call and loop predicates determine whether a transition to a higher
iveresov@2138: // compilation level should be performed (pointers to predicate functions
iveresov@2138: // are passed to common() transition function).
iveresov@2138: bool SimpleThresholdPolicy::loop_predicate(int i, int b, CompLevel cur_level) {
iveresov@2138:   switch(cur_level) {
iveresov@2138:   case CompLevel_none:
iveresov@2138:   case CompLevel_limited_profile: {
iveresov@2138:     return loop_predicate_helper<CompLevel_none>(i, b, 1.0);
iveresov@2138:   }
iveresov@2138:   case CompLevel_full_profile: {
iveresov@2138:     return loop_predicate_helper<CompLevel_full_profile>(i, b, 1.0);
iveresov@2138:   }
iveresov@2138:   default:
iveresov@2138:     return true;
iveresov@2138:   }
iveresov@2138: }
iveresov@2138: 
iveresov@2138: bool SimpleThresholdPolicy::call_predicate(int i, int b, CompLevel cur_level) {
iveresov@2138:   switch(cur_level) {
iveresov@2138:   case CompLevel_none:
iveresov@2138:   case CompLevel_limited_profile: {
iveresov@2138:     return call_predicate_helper<CompLevel_none>(i, b, 1.0);
iveresov@2138:   }
iveresov@2138:   case CompLevel_full_profile: {
iveresov@2138:     return call_predicate_helper<CompLevel_full_profile>(i, b, 1.0);
iveresov@2138:   }
iveresov@2138:   default:
iveresov@2138:     return true;
iveresov@2138:   }
iveresov@2138: }
iveresov@2138: 
iveresov@2138: // Determine is a method is mature.
iveresov@2138: bool SimpleThresholdPolicy::is_mature(methodOop method) {
iveresov@2138:   if (is_trivial(method)) return true;
iveresov@2138:   methodDataOop mdo = method->method_data();
iveresov@2138:   if (mdo != NULL) {
iveresov@2138:     int i = mdo->invocation_count();
iveresov@2138:     int b = mdo->backedge_count();
iveresov@2138:     double k = ProfileMaturityPercentage / 100.0;
iveresov@2138:     return call_predicate_helper<CompLevel_full_profile>(i, b, k) ||
iveresov@2138:            loop_predicate_helper<CompLevel_full_profile>(i, b, k);
iveresov@2138:   }
iveresov@2138:   return false;
iveresov@2138: }
iveresov@2138: 
iveresov@2138: // Common transition function. Given a predicate determines if a method should transition to another level.
iveresov@2138: CompLevel SimpleThresholdPolicy::common(Predicate p, methodOop method, CompLevel cur_level) {
iveresov@2138:   CompLevel next_level = cur_level;
iveresov@2138:   int i = method->invocation_count();
iveresov@2138:   int b = method->backedge_count();
iveresov@2138: 
iveresov@2138:   switch(cur_level) {
iveresov@2138:   case CompLevel_none:
iveresov@2138:     {
iveresov@2138:       methodDataOop mdo = method->method_data();
iveresov@2138:       if (mdo != NULL) {
iveresov@2138:         int mdo_i = mdo->invocation_count();
iveresov@2138:         int mdo_b = mdo->backedge_count();
iveresov@2138:         // If we were at full profile level, would we switch to full opt?
iveresov@2138:         if ((this->*p)(mdo_i, mdo_b, CompLevel_full_profile)) {
iveresov@2138:           next_level = CompLevel_full_optimization;
iveresov@2138:         }
iveresov@2138:       }
iveresov@2138:     }
iveresov@2138:     if (next_level == cur_level && (this->*p)(i, b, cur_level)) {
iveresov@2138:       if (is_trivial(method)) {
iveresov@2138:         next_level = CompLevel_simple;
iveresov@2138:       } else {
iveresov@2138:         next_level = CompLevel_full_profile;
iveresov@2138:       }
iveresov@2138:     }
iveresov@2138:     break;
iveresov@2138:   case CompLevel_limited_profile:
iveresov@2138:   case CompLevel_full_profile:
iveresov@2138:     if (is_trivial(method)) {
iveresov@2138:       next_level = CompLevel_simple;
iveresov@2138:     } else {
iveresov@2138:       methodDataOop mdo = method->method_data();
iveresov@2138:       guarantee(mdo != NULL, "MDO should always exist");
iveresov@2138:       if (mdo->would_profile()) {
iveresov@2138:         int mdo_i = mdo->invocation_count();
iveresov@2138:         int mdo_b = mdo->backedge_count();
iveresov@2138:         if ((this->*p)(mdo_i, mdo_b, cur_level)) {
iveresov@2138:           next_level = CompLevel_full_optimization;
iveresov@2138:         }
iveresov@2138:       } else {
iveresov@2138:         next_level = CompLevel_full_optimization;
iveresov@2138:       }
iveresov@2138:     }
iveresov@2138:     break;
iveresov@2138:   }
iveresov@2138:   return next_level;
iveresov@2138: }
iveresov@2138: 
iveresov@2138: // Determine if a method should be compiled with a normal entry point at a different level.
iveresov@2138: CompLevel SimpleThresholdPolicy::call_event(methodOop method,  CompLevel cur_level) {
iveresov@2138:   CompLevel highest_level = (CompLevel)method->highest_comp_level();
iveresov@2138:   if (cur_level == CompLevel_none && highest_level > cur_level) {
iveresov@2138:     // TODO: We may want to try to do more extensive reprofiling in this case.
iveresov@2138:     return highest_level;
iveresov@2138:   }
iveresov@2138: 
iveresov@2138:   CompLevel osr_level = (CompLevel) method->highest_osr_comp_level();
iveresov@2138:   CompLevel next_level = common(&SimpleThresholdPolicy::call_predicate, method, cur_level);
iveresov@2138: 
iveresov@2138:   // If OSR method level is greater than the regular method level, the levels should be
iveresov@2138:   // equalized by raising the regular method level in order to avoid OSRs during each
iveresov@2138:   // invocation of the method.
iveresov@2138:   if (osr_level == CompLevel_full_optimization && cur_level == CompLevel_full_profile) {
iveresov@2138:     methodDataOop mdo = method->method_data();
iveresov@2138:     guarantee(mdo != NULL, "MDO should not be NULL");
iveresov@2138:     if (mdo->invocation_count() >= 1) {
iveresov@2138:       next_level = CompLevel_full_optimization;
iveresov@2138:     }
iveresov@2138:   } else {
iveresov@2138:     next_level = MAX2(osr_level, next_level);
iveresov@2138:   }
iveresov@2138: 
iveresov@2138:   return next_level;
iveresov@2138: }
iveresov@2138: 
iveresov@2138: // Determine if we should do an OSR compilation of a given method.
iveresov@2138: CompLevel SimpleThresholdPolicy::loop_event(methodOop method, CompLevel cur_level) {
iveresov@2138:   if (cur_level == CompLevel_none) {
iveresov@2138:     // If there is a live OSR method that means that we deopted to the interpreter
iveresov@2138:     // for the transition.
iveresov@2138:     CompLevel osr_level = (CompLevel)method->highest_osr_comp_level();
iveresov@2138:     if (osr_level > CompLevel_none) {
iveresov@2138:       return osr_level;
iveresov@2138:     }
iveresov@2138:   }
iveresov@2138:   return common(&SimpleThresholdPolicy::loop_predicate, method, cur_level);
iveresov@2138: }
iveresov@2138: 
iveresov@2138: 
iveresov@2138: // Handle the invocation event.
iveresov@2138: void SimpleThresholdPolicy::method_invocation_event(methodHandle mh, methodHandle imh,
iveresov@2138:                                               CompLevel level, TRAPS) {
iveresov@2138:   if (is_compilation_enabled() && !CompileBroker::compilation_is_in_queue(mh, InvocationEntryBci)) {
iveresov@2138:     CompLevel next_level = call_event(mh(), level);
iveresov@2138:     if (next_level != level) {
iveresov@2138:       compile(mh, InvocationEntryBci, next_level, THREAD);
iveresov@2138:     }
iveresov@2138:   }
iveresov@2138: }
iveresov@2138: 
iveresov@2138: // Handle the back branch event. Notice that we can compile the method
iveresov@2138: // with a regular entry from here.
iveresov@2138: void SimpleThresholdPolicy::method_back_branch_event(methodHandle mh, methodHandle imh,
iveresov@2138:                                                int bci, CompLevel level, TRAPS) {
iveresov@2138:   // If the method is already compiling, quickly bail out.
iveresov@2138:   if (is_compilation_enabled() && !CompileBroker::compilation_is_in_queue(mh, bci)) {
iveresov@2138:     // Use loop event as an opportinity to also check there's been
iveresov@2138:     // enough calls.
iveresov@2138:     CompLevel cur_level = comp_level(mh());
iveresov@2138:     CompLevel next_level = call_event(mh(), cur_level);
iveresov@2138:     CompLevel next_osr_level = loop_event(mh(), level);
iveresov@2138: 
iveresov@2138:     next_level = MAX2(next_level,
iveresov@2138:                       next_osr_level < CompLevel_full_optimization ? next_osr_level : cur_level);
iveresov@2138:     bool is_compiling = false;
iveresov@2138:     if (next_level != cur_level) {
iveresov@2138:       compile(mh, InvocationEntryBci, next_level, THREAD);
iveresov@2138:       is_compiling = true;
iveresov@2138:     }
iveresov@2138: 
iveresov@2138:     // Do the OSR version
iveresov@2138:     if (!is_compiling && next_osr_level != level) {
iveresov@2138:       compile(mh, bci, next_osr_level, THREAD);
iveresov@2138:     }
iveresov@2138:   }
iveresov@2138: }