hotspot/src/share/vm/runtime/simpleThresholdPolicy.cpp
author sla
Wed, 18 Dec 2013 08:39:06 +0100
changeset 22190 d306a75a70d3
parent 17130 6853aae617cb
child 22551 9bf46d16dcc6
permissions -rw-r--r--
8029726: On OS X some dtrace probe names are mismatched with Solaris 8029727: On OS X dtrace probes Call<type>MethodA/Call<type>MethodV are not fired. 8029728: On OS X dtrace probes SetStaticBooleanField are not fired Reviewed-by: kamg, dsamersoff
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/*
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 * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#include "precompiled.hpp"
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#include "compiler/compileBroker.hpp"
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#include "memory/resourceArea.hpp"
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#include "runtime/arguments.hpp"
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#include "runtime/simpleThresholdPolicy.hpp"
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#include "runtime/simpleThresholdPolicy.inline.hpp"
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#include "code/scopeDesc.hpp"
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void SimpleThresholdPolicy::print_counters(const char* prefix, methodHandle mh) {
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  int invocation_count = mh->invocation_count();
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  int backedge_count = mh->backedge_count();
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  MethodData* mdh = mh->method_data();
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  int mdo_invocations = 0, mdo_backedges = 0;
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  int mdo_invocations_start = 0, mdo_backedges_start = 0;
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  if (mdh != NULL) {
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    mdo_invocations = mdh->invocation_count();
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    mdo_backedges = mdh->backedge_count();
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    mdo_invocations_start = mdh->invocation_count_start();
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    mdo_backedges_start = mdh->backedge_count_start();
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  }
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  tty->print(" %stotal=%d,%d %smdo=%d(%d),%d(%d)", prefix,
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      invocation_count, backedge_count, prefix,
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      mdo_invocations, mdo_invocations_start,
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      mdo_backedges, mdo_backedges_start);
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  tty->print(" %smax levels=%d,%d", prefix,
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      mh->highest_comp_level(), mh->highest_osr_comp_level());
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}
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// Print an event.
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void SimpleThresholdPolicy::print_event(EventType type, methodHandle mh, methodHandle imh,
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                                        int bci, CompLevel level) {
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  bool inlinee_event = mh() != imh();
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  ttyLocker tty_lock;
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  tty->print("%lf: [", os::elapsedTime());
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  switch(type) {
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  case CALL:
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    tty->print("call");
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    break;
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  case LOOP:
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    tty->print("loop");
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    break;
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  case COMPILE:
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    tty->print("compile");
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    break;
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  case REMOVE_FROM_QUEUE:
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    tty->print("remove-from-queue");
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    break;
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  case UPDATE_IN_QUEUE:
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    tty->print("update-in-queue");
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    break;
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  case REPROFILE:
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    tty->print("reprofile");
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    break;
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  case MAKE_NOT_ENTRANT:
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    tty->print("make-not-entrant");
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    break;
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  default:
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    tty->print("unknown");
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  }
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  tty->print(" level=%d ", level);
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  ResourceMark rm;
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  char *method_name = mh->name_and_sig_as_C_string();
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  tty->print("[%s", method_name);
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  if (inlinee_event) {
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    char *inlinee_name = imh->name_and_sig_as_C_string();
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    tty->print(" [%s]] ", inlinee_name);
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  }
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  else tty->print("] ");
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  tty->print("@%d queues=%d,%d", bci, CompileBroker::queue_size(CompLevel_full_profile),
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                                      CompileBroker::queue_size(CompLevel_full_optimization));
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  print_specific(type, mh, imh, bci, level);
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  if (type != COMPILE) {
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    print_counters("", mh);
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    if (inlinee_event) {
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      print_counters("inlinee ", imh);
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    }
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    tty->print(" compilable=");
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    bool need_comma = false;
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    if (!mh->is_not_compilable(CompLevel_full_profile)) {
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      tty->print("c1");
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      need_comma = true;
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    }
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    if (!mh->is_not_osr_compilable(CompLevel_full_profile)) {
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      if (need_comma) tty->print(",");
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      tty->print("c1-osr");
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      need_comma = true;
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    }
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    if (!mh->is_not_compilable(CompLevel_full_optimization)) {
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      if (need_comma) tty->print(",");
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      tty->print("c2");
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      need_comma = true;
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    }
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    if (!mh->is_not_osr_compilable(CompLevel_full_optimization)) {
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      if (need_comma) tty->print(",");
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      tty->print("c2-osr");
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    }
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    tty->print(" status=");
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    if (mh->queued_for_compilation()) {
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      tty->print("in-queue");
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    } else tty->print("idle");
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  }
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  tty->print_cr("]");
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}
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void SimpleThresholdPolicy::initialize() {
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  if (FLAG_IS_DEFAULT(CICompilerCount)) {
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    FLAG_SET_DEFAULT(CICompilerCount, 3);
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  }
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  int count = CICompilerCount;
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  if (CICompilerCountPerCPU) {
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    count = MAX2(log2_intptr(os::active_processor_count()), 1) * 3 / 2;
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  }
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  set_c1_count(MAX2(count / 3, 1));
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  set_c2_count(MAX2(count - count / 3, 1));
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}
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void SimpleThresholdPolicy::set_carry_if_necessary(InvocationCounter *counter) {
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  if (!counter->carry() && counter->count() > InvocationCounter::count_limit / 2) {
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    counter->set_carry_flag();
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  }
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}
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// Set carry flags on the counters if necessary
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void SimpleThresholdPolicy::handle_counter_overflow(Method* method) {
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  MethodCounters *mcs = method->method_counters();
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  if (mcs != NULL) {
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    set_carry_if_necessary(mcs->invocation_counter());
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    set_carry_if_necessary(mcs->backedge_counter());
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  }
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  MethodData* mdo = method->method_data();
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  if (mdo != NULL) {
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    set_carry_if_necessary(mdo->invocation_counter());
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    set_carry_if_necessary(mdo->backedge_counter());
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  }
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}
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// Called with the queue locked and with at least one element
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CompileTask* SimpleThresholdPolicy::select_task(CompileQueue* compile_queue) {
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  return compile_queue->first();
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}
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void SimpleThresholdPolicy::reprofile(ScopeDesc* trap_scope, bool is_osr) {
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  for (ScopeDesc* sd = trap_scope;; sd = sd->sender()) {
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    if (PrintTieredEvents) {
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      methodHandle mh(sd->method());
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      print_event(REPROFILE, mh, mh, InvocationEntryBci, CompLevel_none);
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    }
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    MethodData* mdo = sd->method()->method_data();
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    if (mdo != NULL) {
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      mdo->reset_start_counters();
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    }
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    if (sd->is_top()) break;
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  }
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}
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nmethod* SimpleThresholdPolicy::event(methodHandle method, methodHandle inlinee,
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                                      int branch_bci, int bci, CompLevel comp_level, nmethod* nm, JavaThread* thread) {
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  if (comp_level == CompLevel_none &&
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      JvmtiExport::can_post_interpreter_events() &&
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      thread->is_interp_only_mode()) {
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    return NULL;
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  }
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  nmethod *osr_nm = NULL;
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  handle_counter_overflow(method());
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  if (method() != inlinee()) {
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    handle_counter_overflow(inlinee());
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  }
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  if (PrintTieredEvents) {
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    print_event(bci == InvocationEntryBci ? CALL : LOOP, method, inlinee, bci, comp_level);
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  }
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  if (bci == InvocationEntryBci) {
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    method_invocation_event(method, inlinee, comp_level, nm, thread);
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  } else {
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    method_back_branch_event(method, inlinee, bci, comp_level, nm, thread);
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    // method == inlinee if the event originated in the main method
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    int highest_level = inlinee->highest_osr_comp_level();
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    if (highest_level > comp_level) {
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      osr_nm = inlinee->lookup_osr_nmethod_for(bci, highest_level, false);
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    }
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  }
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  return osr_nm;
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}
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// Check if the method can be compiled, change level if necessary
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void SimpleThresholdPolicy::compile(methodHandle mh, int bci, CompLevel level, JavaThread* thread) {
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  assert(level <= TieredStopAtLevel, "Invalid compilation level");
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  if (level == CompLevel_none) {
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    return;
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  }
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  // Check if the method can be compiled. If it cannot be compiled with C1, continue profiling
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  // in the interpreter and then compile with C2 (the transition function will request that,
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  // see common() ). If the method cannot be compiled with C2 but still can with C1, compile it with
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  // pure C1.
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  if (!can_be_compiled(mh, level)) {
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    if (level == CompLevel_full_optimization && can_be_compiled(mh, CompLevel_simple)) {
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        compile(mh, bci, CompLevel_simple, thread);
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    }
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    return;
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   233
  }
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  if (bci != InvocationEntryBci && mh->is_not_osr_compilable(level)) {
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    return;
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   236
  }
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  if (!CompileBroker::compilation_is_in_queue(mh, bci)) {
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    if (PrintTieredEvents) {
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      print_event(COMPILE, mh, mh, bci, level);
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    }
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    submit_compile(mh, bci, level, thread);
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  }
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}
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// Tell the broker to compile the method
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void SimpleThresholdPolicy::submit_compile(methodHandle mh, int bci, CompLevel level, JavaThread* thread) {
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  int hot_count = (bci == InvocationEntryBci) ? mh->invocation_count() : mh->backedge_count();
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  CompileBroker::compile_method(mh, bci, level, mh, hot_count, "tiered", thread);
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}
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// Call and loop predicates determine whether a transition to a higher
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// compilation level should be performed (pointers to predicate functions
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// are passed to common() transition function).
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bool SimpleThresholdPolicy::loop_predicate(int i, int b, CompLevel cur_level) {
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  switch(cur_level) {
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  case CompLevel_none:
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  case CompLevel_limited_profile: {
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   258
    return loop_predicate_helper<CompLevel_none>(i, b, 1.0);
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   259
  }
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  case CompLevel_full_profile: {
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   261
    return loop_predicate_helper<CompLevel_full_profile>(i, b, 1.0);
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   262
  }
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   263
  default:
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    return true;
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   265
  }
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   266
}
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   267
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bool SimpleThresholdPolicy::call_predicate(int i, int b, CompLevel cur_level) {
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  switch(cur_level) {
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  case CompLevel_none:
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  case CompLevel_limited_profile: {
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    return call_predicate_helper<CompLevel_none>(i, b, 1.0);
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   273
  }
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   274
  case CompLevel_full_profile: {
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    return call_predicate_helper<CompLevel_full_profile>(i, b, 1.0);
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   276
  }
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  default:
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   278
    return true;
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   279
  }
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   280
}
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   281
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// Determine is a method is mature.
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bool SimpleThresholdPolicy::is_mature(Method* method) {
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  if (is_trivial(method)) return true;
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  MethodData* mdo = method->method_data();
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   286
  if (mdo != NULL) {
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   287
    int i = mdo->invocation_count();
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   288
    int b = mdo->backedge_count();
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   289
    double k = ProfileMaturityPercentage / 100.0;
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   290
    return call_predicate_helper<CompLevel_full_profile>(i, b, k) ||
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   291
           loop_predicate_helper<CompLevel_full_profile>(i, b, k);
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   292
  }
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   293
  return false;
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   294
}
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   295
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// Common transition function. Given a predicate determines if a method should transition to another level.
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   297
CompLevel SimpleThresholdPolicy::common(Predicate p, Method* method, CompLevel cur_level) {
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   298
  CompLevel next_level = cur_level;
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   299
  int i = method->invocation_count();
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   300
  int b = method->backedge_count();
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   301
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   302
  if (is_trivial(method)) {
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   303
    next_level = CompLevel_simple;
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   304
  } else {
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   305
    switch(cur_level) {
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   306
    case CompLevel_none:
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   307
      // If we were at full profile level, would we switch to full opt?
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   308
      if (common(p, method, CompLevel_full_profile) == CompLevel_full_optimization) {
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   309
        next_level = CompLevel_full_optimization;
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   310
      } else if ((this->*p)(i, b, cur_level)) {
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   311
        next_level = CompLevel_full_profile;
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   312
      }
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   313
      break;
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   314
    case CompLevel_limited_profile:
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   315
    case CompLevel_full_profile:
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   316
      {
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   317
        MethodData* mdo = method->method_data();
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   318
        if (mdo != NULL) {
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   319
          if (mdo->would_profile()) {
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   320
            int mdo_i = mdo->invocation_count_delta();
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   321
            int mdo_b = mdo->backedge_count_delta();
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   322
            if ((this->*p)(mdo_i, mdo_b, cur_level)) {
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   323
              next_level = CompLevel_full_optimization;
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   324
            }
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   325
          } else {
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   326
            next_level = CompLevel_full_optimization;
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   327
          }
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   328
        }
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   329
      }
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      break;
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   331
    }
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   332
  }
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   333
  return MIN2(next_level, (CompLevel)TieredStopAtLevel);
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   334
}
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   335
970dc585ab63 6953144: Tiered compilation
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   336
// Determine if a method should be compiled with a normal entry point at a different level.
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CompLevel SimpleThresholdPolicy::call_event(Method* method,  CompLevel cur_level) {
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  CompLevel osr_level = MIN2((CompLevel) method->highest_osr_comp_level(),
714ad59b56cb 7058689: Tiered: Reprofiling doesn't happen in presence of level 4 OSR methods
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                             common(&SimpleThresholdPolicy::loop_predicate, method, cur_level));
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  CompLevel next_level = common(&SimpleThresholdPolicy::call_predicate, method, cur_level);
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   341
970dc585ab63 6953144: Tiered compilation
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   342
  // If OSR method level is greater than the regular method level, the levels should be
970dc585ab63 6953144: Tiered compilation
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   343
  // equalized by raising the regular method level in order to avoid OSRs during each
970dc585ab63 6953144: Tiered compilation
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   344
  // invocation of the method.
970dc585ab63 6953144: Tiered compilation
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   345
  if (osr_level == CompLevel_full_optimization && cur_level == CompLevel_full_profile) {
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882756847a04 6964458: Reimplement class meta-data storage to use native memory
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   346
    MethodData* mdo = method->method_data();
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   347
    guarantee(mdo != NULL, "MDO should not be NULL");
970dc585ab63 6953144: Tiered compilation
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parents:
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   348
    if (mdo->invocation_count() >= 1) {
970dc585ab63 6953144: Tiered compilation
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   349
      next_level = CompLevel_full_optimization;
970dc585ab63 6953144: Tiered compilation
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   350
    }
970dc585ab63 6953144: Tiered compilation
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   351
  } else {
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   352
    next_level = MAX2(osr_level, next_level);
970dc585ab63 6953144: Tiered compilation
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   353
  }
970dc585ab63 6953144: Tiered compilation
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   354
970dc585ab63 6953144: Tiered compilation
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   355
  return next_level;
970dc585ab63 6953144: Tiered compilation
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parents:
diff changeset
   356
}
970dc585ab63 6953144: Tiered compilation
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parents:
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   357
970dc585ab63 6953144: Tiered compilation
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parents:
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   358
// Determine if we should do an OSR compilation of a given method.
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882756847a04 6964458: Reimplement class meta-data storage to use native memory
coleenp
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diff changeset
   359
CompLevel SimpleThresholdPolicy::loop_event(Method* method, CompLevel cur_level) {
10013
714ad59b56cb 7058689: Tiered: Reprofiling doesn't happen in presence of level 4 OSR methods
iveresov
parents: 9625
diff changeset
   360
  CompLevel next_level = common(&SimpleThresholdPolicy::loop_predicate, method, cur_level);
6453
970dc585ab63 6953144: Tiered compilation
iveresov
parents:
diff changeset
   361
  if (cur_level == CompLevel_none) {
970dc585ab63 6953144: Tiered compilation
iveresov
parents:
diff changeset
   362
    // If there is a live OSR method that means that we deopted to the interpreter
970dc585ab63 6953144: Tiered compilation
iveresov
parents:
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   363
    // for the transition.
10013
714ad59b56cb 7058689: Tiered: Reprofiling doesn't happen in presence of level 4 OSR methods
iveresov
parents: 9625
diff changeset
   364
    CompLevel osr_level = MIN2((CompLevel)method->highest_osr_comp_level(), next_level);
6453
970dc585ab63 6953144: Tiered compilation
iveresov
parents:
diff changeset
   365
    if (osr_level > CompLevel_none) {
970dc585ab63 6953144: Tiered compilation
iveresov
parents:
diff changeset
   366
      return osr_level;
970dc585ab63 6953144: Tiered compilation
iveresov
parents:
diff changeset
   367
    }
970dc585ab63 6953144: Tiered compilation
iveresov
parents:
diff changeset
   368
  }
10013
714ad59b56cb 7058689: Tiered: Reprofiling doesn't happen in presence of level 4 OSR methods
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diff changeset
   369
  return next_level;
6453
970dc585ab63 6953144: Tiered compilation
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diff changeset
   370
}
970dc585ab63 6953144: Tiered compilation
iveresov
parents:
diff changeset
   371
970dc585ab63 6953144: Tiered compilation
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parents:
diff changeset
   372
970dc585ab63 6953144: Tiered compilation
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parents:
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   373
// Handle the invocation event.
970dc585ab63 6953144: Tiered compilation
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   374
void SimpleThresholdPolicy::method_invocation_event(methodHandle mh, methodHandle imh,
11572
84afef481892 7131259: compile_method and CompilationPolicy::event shouldn't be declared TRAPS
iveresov
parents: 11192
diff changeset
   375
                                              CompLevel level, nmethod* nm, JavaThread* thread) {
6453
970dc585ab63 6953144: Tiered compilation
iveresov
parents:
diff changeset
   376
  if (is_compilation_enabled() && !CompileBroker::compilation_is_in_queue(mh, InvocationEntryBci)) {
970dc585ab63 6953144: Tiered compilation
iveresov
parents:
diff changeset
   377
    CompLevel next_level = call_event(mh(), level);
970dc585ab63 6953144: Tiered compilation
iveresov
parents:
diff changeset
   378
    if (next_level != level) {
11572
84afef481892 7131259: compile_method and CompilationPolicy::event shouldn't be declared TRAPS
iveresov
parents: 11192
diff changeset
   379
      compile(mh, InvocationEntryBci, next_level, thread);
6453
970dc585ab63 6953144: Tiered compilation
iveresov
parents:
diff changeset
   380
    }
970dc585ab63 6953144: Tiered compilation
iveresov
parents:
diff changeset
   381
  }
970dc585ab63 6953144: Tiered compilation
iveresov
parents:
diff changeset
   382
}
970dc585ab63 6953144: Tiered compilation
iveresov
parents:
diff changeset
   383
970dc585ab63 6953144: Tiered compilation
iveresov
parents:
diff changeset
   384
// Handle the back branch event. Notice that we can compile the method
970dc585ab63 6953144: Tiered compilation
iveresov
parents:
diff changeset
   385
// with a regular entry from here.
970dc585ab63 6953144: Tiered compilation
iveresov
parents:
diff changeset
   386
void SimpleThresholdPolicy::method_back_branch_event(methodHandle mh, methodHandle imh,
11572
84afef481892 7131259: compile_method and CompilationPolicy::event shouldn't be declared TRAPS
iveresov
parents: 11192
diff changeset
   387
                                                     int bci, CompLevel level, nmethod* nm, JavaThread* thread) {
6453
970dc585ab63 6953144: Tiered compilation
iveresov
parents:
diff changeset
   388
  // If the method is already compiling, quickly bail out.
970dc585ab63 6953144: Tiered compilation
iveresov
parents:
diff changeset
   389
  if (is_compilation_enabled() && !CompileBroker::compilation_is_in_queue(mh, bci)) {
970dc585ab63 6953144: Tiered compilation
iveresov
parents:
diff changeset
   390
    // Use loop event as an opportinity to also check there's been
970dc585ab63 6953144: Tiered compilation
iveresov
parents:
diff changeset
   391
    // enough calls.
970dc585ab63 6953144: Tiered compilation
iveresov
parents:
diff changeset
   392
    CompLevel cur_level = comp_level(mh());
970dc585ab63 6953144: Tiered compilation
iveresov
parents:
diff changeset
   393
    CompLevel next_level = call_event(mh(), cur_level);
970dc585ab63 6953144: Tiered compilation
iveresov
parents:
diff changeset
   394
    CompLevel next_osr_level = loop_event(mh(), level);
970dc585ab63 6953144: Tiered compilation
iveresov
parents:
diff changeset
   395
970dc585ab63 6953144: Tiered compilation
iveresov
parents:
diff changeset
   396
    next_level = MAX2(next_level,
970dc585ab63 6953144: Tiered compilation
iveresov
parents:
diff changeset
   397
                      next_osr_level < CompLevel_full_optimization ? next_osr_level : cur_level);
970dc585ab63 6953144: Tiered compilation
iveresov
parents:
diff changeset
   398
    bool is_compiling = false;
970dc585ab63 6953144: Tiered compilation
iveresov
parents:
diff changeset
   399
    if (next_level != cur_level) {
11572
84afef481892 7131259: compile_method and CompilationPolicy::event shouldn't be declared TRAPS
iveresov
parents: 11192
diff changeset
   400
      compile(mh, InvocationEntryBci, next_level, thread);
6453
970dc585ab63 6953144: Tiered compilation
iveresov
parents:
diff changeset
   401
      is_compiling = true;
970dc585ab63 6953144: Tiered compilation
iveresov
parents:
diff changeset
   402
    }
970dc585ab63 6953144: Tiered compilation
iveresov
parents:
diff changeset
   403
970dc585ab63 6953144: Tiered compilation
iveresov
parents:
diff changeset
   404
    // Do the OSR version
970dc585ab63 6953144: Tiered compilation
iveresov
parents:
diff changeset
   405
    if (!is_compiling && next_osr_level != level) {
11572
84afef481892 7131259: compile_method and CompilationPolicy::event shouldn't be declared TRAPS
iveresov
parents: 11192
diff changeset
   406
      compile(mh, bci, next_osr_level, thread);
6453
970dc585ab63 6953144: Tiered compilation
iveresov
parents:
diff changeset
   407
    }
970dc585ab63 6953144: Tiered compilation
iveresov
parents:
diff changeset
   408
  }
970dc585ab63 6953144: Tiered compilation
iveresov
parents:
diff changeset
   409
}