jdk8-mips64-public/hotspot: src/share/vm/runtime/simpleThresholdPolicy.cpp@fa83ab460c54 (annotated)

src/share/vm/runtime/simpleThresholdPolicy.cpp@fa83ab460c54 (annotated)

src/share/vm/runtime/simpleThresholdPolicy.cpp

Fri, 22 Oct 2010 15:59:34 -0400

author: acorn
date: Fri, 22 Oct 2010 15:59:34 -0400
changeset 2233: fa83ab460c54
parent 2138: d5d065957597
child 2306: 22ef3370343b
permissions: -rw-r--r--

6988353: refactor contended sync subsystem
Summary: reduce complexity by factoring synchronizer.cpp
Reviewed-by: dholmes, never, coleenp

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

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/runtime/simpleThresholdPolicy.cpp@fa83ab460c54 (annotated)

src/share/vm/runtime/simpleThresholdPolicy.cpp