--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/runtime/simpleThresholdPolicy.cpp Fri Sep 03 17:51:07 2010 -0700
@@ -0,0 +1,377 @@
+/*
+ * 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);
+ }
+ }
+}