--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/oops/methodCounters.hpp Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,267 @@
+/*
+ * Copyright (c) 2013, 2017, 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.
+ *
+ */
+
+#ifndef SHARE_VM_OOPS_METHODCOUNTERS_HPP
+#define SHARE_VM_OOPS_METHODCOUNTERS_HPP
+
+#include "oops/metadata.hpp"
+#include "compiler/compilerOracle.hpp"
+#include "interpreter/invocationCounter.hpp"
+#include "runtime/arguments.hpp"
+#include "utilities/align.hpp"
+
+class MethodCounters : public Metadata {
+ friend class VMStructs;
+ friend class JVMCIVMStructs;
+ private:
+ // If you add a new field that points to any metaspace object, you
+ // must add this field to MethodCounters::metaspace_pointers_do().
+#if INCLUDE_AOT
+ Method* _method; // Back link to Method
+#endif
+#if defined(COMPILER2) || INCLUDE_JVMCI
+ int _interpreter_invocation_count; // Count of times invoked (reused as prev_event_count in tiered)
+ u2 _interpreter_throwout_count; // Count of times method was exited via exception while interpreting
+#endif
+#if INCLUDE_JVMTI
+ u2 _number_of_breakpoints; // fullspeed debugging support
+#endif
+ InvocationCounter _invocation_counter; // Incremented before each activation of the method - used to trigger frequency-based optimizations
+ InvocationCounter _backedge_counter; // Incremented before each backedge taken - used to trigger frequencey-based optimizations
+ // NMethod age is a counter for warm methods detection in the code cache sweeper.
+ // The counter is reset by the sweeper and is decremented by some of the compiled
+ // code. The counter values are interpreted as follows:
+ // 1. (HotMethodDetection..INT_MAX] - initial value, no counters inserted
+ // 2. [1..HotMethodDetectionLimit) - the method is warm, the counter is used
+ // to figure out which methods can be flushed.
+ // 3. (INT_MIN..0] - method is hot and will deopt and get
+ // recompiled without the counters
+ int _nmethod_age;
+ int _interpreter_invocation_limit; // per-method InterpreterInvocationLimit
+ int _interpreter_backward_branch_limit; // per-method InterpreterBackwardBranchLimit
+ int _interpreter_profile_limit; // per-method InterpreterProfileLimit
+ int _invoke_mask; // per-method Tier0InvokeNotifyFreqLog
+ int _backedge_mask; // per-method Tier0BackedgeNotifyFreqLog
+#ifdef TIERED
+ float _rate; // Events (invocation and backedge counter increments) per millisecond
+ jlong _prev_time; // Previous time the rate was acquired
+ u1 _highest_comp_level; // Highest compile level this method has ever seen.
+ u1 _highest_osr_comp_level; // Same for OSR level
+#endif
+
+ MethodCounters(const methodHandle& mh) :
+#if INCLUDE_AOT
+ _method(mh()),
+#endif
+ _nmethod_age(INT_MAX)
+#ifdef TIERED
+ , _rate(0),
+ _prev_time(0),
+ _highest_comp_level(0),
+ _highest_osr_comp_level(0)
+#endif
+ {
+ set_interpreter_invocation_count(0);
+ set_interpreter_throwout_count(0);
+ JVMTI_ONLY(clear_number_of_breakpoints());
+ invocation_counter()->init();
+ backedge_counter()->init();
+
+ if (StressCodeAging) {
+ set_nmethod_age(HotMethodDetectionLimit);
+ }
+
+ // Set per-method thresholds.
+ double scale = 1.0;
+ CompilerOracle::has_option_value(mh, "CompileThresholdScaling", scale);
+
+ int compile_threshold = Arguments::scaled_compile_threshold(CompileThreshold, scale);
+ _interpreter_invocation_limit = compile_threshold << InvocationCounter::count_shift;
+ if (ProfileInterpreter) {
+ // If interpreter profiling is enabled, the backward branch limit
+ // is compared against the method data counter rather than an invocation
+ // counter, therefore no shifting of bits is required.
+ _interpreter_backward_branch_limit = (compile_threshold * (OnStackReplacePercentage - InterpreterProfilePercentage)) / 100;
+ } else {
+ _interpreter_backward_branch_limit = ((compile_threshold * OnStackReplacePercentage) / 100) << InvocationCounter::count_shift;
+ }
+ _interpreter_profile_limit = ((compile_threshold * InterpreterProfilePercentage) / 100) << InvocationCounter::count_shift;
+ _invoke_mask = right_n_bits(Arguments::scaled_freq_log(Tier0InvokeNotifyFreqLog, scale)) << InvocationCounter::count_shift;
+ _backedge_mask = right_n_bits(Arguments::scaled_freq_log(Tier0BackedgeNotifyFreqLog, scale)) << InvocationCounter::count_shift;
+ }
+
+ public:
+ virtual bool is_methodCounters() const volatile { return true; }
+
+ static MethodCounters* allocate(const methodHandle& mh, TRAPS);
+
+ void deallocate_contents(ClassLoaderData* loader_data) {}
+
+ AOT_ONLY(Method* method() const { return _method; })
+
+ static int method_counters_size() {
+ return align_up((int)sizeof(MethodCounters), wordSize) / wordSize;
+ }
+ virtual int size() const {
+ return method_counters_size();
+ }
+ void metaspace_pointers_do(MetaspaceClosure* it);
+ MetaspaceObj::Type type() const { return MethodCountersType; }
+ void clear_counters();
+
+#if defined(COMPILER2) || INCLUDE_JVMCI
+
+ int interpreter_invocation_count() {
+ return _interpreter_invocation_count;
+ }
+ void set_interpreter_invocation_count(int count) {
+ _interpreter_invocation_count = count;
+ }
+ int increment_interpreter_invocation_count() {
+ return ++_interpreter_invocation_count;
+ }
+
+ void interpreter_throwout_increment() {
+ if (_interpreter_throwout_count < 65534) {
+ _interpreter_throwout_count++;
+ }
+ }
+ int interpreter_throwout_count() const {
+ return _interpreter_throwout_count;
+ }
+ void set_interpreter_throwout_count(int count) {
+ _interpreter_throwout_count = count;
+ }
+
+#else // defined(COMPILER2) || INCLUDE_JVMCI
+
+ int interpreter_invocation_count() {
+ return 0;
+ }
+ void set_interpreter_invocation_count(int count) {
+ assert(count == 0, "count must be 0");
+ }
+
+ int interpreter_throwout_count() const {
+ return 0;
+ }
+ void set_interpreter_throwout_count(int count) {
+ assert(count == 0, "count must be 0");
+ }
+
+#endif // defined(COMPILER2) || INCLUDE_JVMCI
+
+#if INCLUDE_JVMTI
+ u2 number_of_breakpoints() const { return _number_of_breakpoints; }
+ void incr_number_of_breakpoints() { ++_number_of_breakpoints; }
+ void decr_number_of_breakpoints() { --_number_of_breakpoints; }
+ void clear_number_of_breakpoints() { _number_of_breakpoints = 0; }
+#endif
+
+#ifdef TIERED
+ jlong prev_time() const { return _prev_time; }
+ void set_prev_time(jlong time) { _prev_time = time; }
+ float rate() const { return _rate; }
+ void set_rate(float rate) { _rate = rate; }
+#endif
+
+ int highest_comp_level() const;
+ void set_highest_comp_level(int level);
+ int highest_osr_comp_level() const;
+ void set_highest_osr_comp_level(int level);
+
+ // invocation counter
+ InvocationCounter* invocation_counter() { return &_invocation_counter; }
+ InvocationCounter* backedge_counter() { return &_backedge_counter; }
+
+ int nmethod_age() {
+ return _nmethod_age;
+ }
+ void set_nmethod_age(int age) {
+ _nmethod_age = age;
+ }
+ void reset_nmethod_age() {
+ set_nmethod_age(HotMethodDetectionLimit);
+ }
+
+ static bool is_nmethod_hot(int age) { return age <= 0; }
+ static bool is_nmethod_warm(int age) { return age < HotMethodDetectionLimit; }
+ static bool is_nmethod_age_unset(int age) { return age > HotMethodDetectionLimit; }
+
+ static ByteSize nmethod_age_offset() {
+ return byte_offset_of(MethodCounters, _nmethod_age);
+ }
+
+#if defined(COMPILER2) || INCLUDE_JVMCI
+
+ static ByteSize interpreter_invocation_counter_offset() {
+ return byte_offset_of(MethodCounters, _interpreter_invocation_count);
+ }
+
+ static int interpreter_invocation_counter_offset_in_bytes() {
+ return offset_of(MethodCounters, _interpreter_invocation_count);
+ }
+
+#else // defined(COMPILER2) || INCLUDE_JVMCI
+
+ static ByteSize interpreter_invocation_counter_offset() {
+ ShouldNotReachHere();
+ return in_ByteSize(0);
+ }
+
+#endif // defined(COMPILER2) || INCLUDE_JVMCI
+
+ static ByteSize invocation_counter_offset() {
+ return byte_offset_of(MethodCounters, _invocation_counter);
+ }
+
+ static ByteSize backedge_counter_offset() {
+ return byte_offset_of(MethodCounters, _backedge_counter);
+ }
+
+ static ByteSize interpreter_invocation_limit_offset() {
+ return byte_offset_of(MethodCounters, _interpreter_invocation_limit);
+ }
+
+ static ByteSize interpreter_backward_branch_limit_offset() {
+ return byte_offset_of(MethodCounters, _interpreter_backward_branch_limit);
+ }
+
+ static ByteSize interpreter_profile_limit_offset() {
+ return byte_offset_of(MethodCounters, _interpreter_profile_limit);
+ }
+
+ static ByteSize invoke_mask_offset() {
+ return byte_offset_of(MethodCounters, _invoke_mask);
+ }
+
+ static ByteSize backedge_mask_offset() {
+ return byte_offset_of(MethodCounters, _backedge_mask);
+ }
+
+ virtual const char* internal_name() const { return "{method counters}"; }
+ virtual void print_value_on(outputStream* st) const;
+
+};
+#endif //SHARE_VM_OOPS_METHODCOUNTERS_HPP