/*
* 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 COMPILER2_OR_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 COMPILER2_OR_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 // COMPILER2_OR_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 // COMPILER2_OR_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 COMPILER2_OR_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 // COMPILER2_OR_JVMCI
static ByteSize interpreter_invocation_counter_offset() {
ShouldNotReachHere();
return in_ByteSize(0);
}
#endif // COMPILER2_OR_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