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compileBroker.cpp
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compileBroker.cpp
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/*
* Copyright (c) 1999, 2024, 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 "precompiled.hpp"
#include "classfile/javaClasses.inline.hpp"
#include "classfile/symbolTable.hpp"
#include "classfile/vmClasses.hpp"
#include "classfile/vmSymbols.hpp"
#include "code/codeCache.hpp"
#include "code/codeHeapState.hpp"
#include "code/dependencyContext.hpp"
#include "compiler/compilationLog.hpp"
#include "compiler/compilationMemoryStatistic.hpp"
#include "compiler/compilationPolicy.hpp"
#include "compiler/compileBroker.hpp"
#include "compiler/compileLog.hpp"
#include "compiler/compilerEvent.hpp"
#include "compiler/compilerOracle.hpp"
#include "compiler/directivesParser.hpp"
#include "gc/shared/memAllocator.hpp"
#include "interpreter/linkResolver.hpp"
#include "jvm.h"
#include "jfr/jfrEvents.hpp"
#include "logging/log.hpp"
#include "logging/logStream.hpp"
#include "memory/allocation.inline.hpp"
#include "memory/resourceArea.hpp"
#include "memory/universe.hpp"
#include "oops/methodData.hpp"
#include "oops/method.inline.hpp"
#include "oops/oop.inline.hpp"
#include "prims/jvmtiExport.hpp"
#include "prims/nativeLookup.hpp"
#include "prims/whitebox.hpp"
#include "runtime/atomic.hpp"
#include "runtime/escapeBarrier.hpp"
#include "runtime/globals_extension.hpp"
#include "runtime/handles.inline.hpp"
#include "runtime/init.hpp"
#include "runtime/interfaceSupport.inline.hpp"
#include "runtime/java.hpp"
#include "runtime/javaCalls.hpp"
#include "runtime/jniHandles.inline.hpp"
#include "runtime/os.hpp"
#include "runtime/perfData.hpp"
#include "runtime/safepointVerifiers.hpp"
#include "runtime/sharedRuntime.hpp"
#include "runtime/threads.hpp"
#include "runtime/threadSMR.hpp"
#include "runtime/timerTrace.hpp"
#include "runtime/vframe.inline.hpp"
#include "utilities/debug.hpp"
#include "utilities/dtrace.hpp"
#include "utilities/events.hpp"
#include "utilities/formatBuffer.hpp"
#include "utilities/macros.hpp"
#ifdef COMPILER1
#include "c1/c1_Compiler.hpp"
#endif
#ifdef COMPILER2
#include "opto/c2compiler.hpp"
#endif
#if INCLUDE_JVMCI
#include "jvmci/jvmciEnv.hpp"
#include "jvmci/jvmciRuntime.hpp"
#endif
#ifdef DTRACE_ENABLED
// Only bother with this argument setup if dtrace is available
#define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name) \
{ \
Symbol* klass_name = (method)->klass_name(); \
Symbol* name = (method)->name(); \
Symbol* signature = (method)->signature(); \
HOTSPOT_METHOD_COMPILE_BEGIN( \
(char *) comp_name, strlen(comp_name), \
(char *) klass_name->bytes(), klass_name->utf8_length(), \
(char *) name->bytes(), name->utf8_length(), \
(char *) signature->bytes(), signature->utf8_length()); \
}
#define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success) \
{ \
Symbol* klass_name = (method)->klass_name(); \
Symbol* name = (method)->name(); \
Symbol* signature = (method)->signature(); \
HOTSPOT_METHOD_COMPILE_END( \
(char *) comp_name, strlen(comp_name), \
(char *) klass_name->bytes(), klass_name->utf8_length(), \
(char *) name->bytes(), name->utf8_length(), \
(char *) signature->bytes(), signature->utf8_length(), (success)); \
}
#else // ndef DTRACE_ENABLED
#define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name)
#define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success)
#endif // ndef DTRACE_ENABLED
bool CompileBroker::_initialized = false;
volatile bool CompileBroker::_should_block = false;
volatile int CompileBroker::_print_compilation_warning = 0;
volatile jint CompileBroker::_should_compile_new_jobs = run_compilation;
// The installed compiler(s)
AbstractCompiler* CompileBroker::_compilers[2];
// The maximum numbers of compiler threads to be determined during startup.
int CompileBroker::_c1_count = 0;
int CompileBroker::_c2_count = 0;
// An array of compiler names as Java String objects
jobject* CompileBroker::_compiler1_objects = nullptr;
jobject* CompileBroker::_compiler2_objects = nullptr;
CompileLog** CompileBroker::_compiler1_logs = nullptr;
CompileLog** CompileBroker::_compiler2_logs = nullptr;
// These counters are used to assign an unique ID to each compilation.
volatile jint CompileBroker::_compilation_id = 0;
volatile jint CompileBroker::_osr_compilation_id = 0;
volatile jint CompileBroker::_native_compilation_id = 0;
// Performance counters
PerfCounter* CompileBroker::_perf_total_compilation = nullptr;
PerfCounter* CompileBroker::_perf_osr_compilation = nullptr;
PerfCounter* CompileBroker::_perf_standard_compilation = nullptr;
PerfCounter* CompileBroker::_perf_total_bailout_count = nullptr;
PerfCounter* CompileBroker::_perf_total_invalidated_count = nullptr;
PerfCounter* CompileBroker::_perf_total_compile_count = nullptr;
PerfCounter* CompileBroker::_perf_total_osr_compile_count = nullptr;
PerfCounter* CompileBroker::_perf_total_standard_compile_count = nullptr;
PerfCounter* CompileBroker::_perf_sum_osr_bytes_compiled = nullptr;
PerfCounter* CompileBroker::_perf_sum_standard_bytes_compiled = nullptr;
PerfCounter* CompileBroker::_perf_sum_nmethod_size = nullptr;
PerfCounter* CompileBroker::_perf_sum_nmethod_code_size = nullptr;
PerfStringVariable* CompileBroker::_perf_last_method = nullptr;
PerfStringVariable* CompileBroker::_perf_last_failed_method = nullptr;
PerfStringVariable* CompileBroker::_perf_last_invalidated_method = nullptr;
PerfVariable* CompileBroker::_perf_last_compile_type = nullptr;
PerfVariable* CompileBroker::_perf_last_compile_size = nullptr;
PerfVariable* CompileBroker::_perf_last_failed_type = nullptr;
PerfVariable* CompileBroker::_perf_last_invalidated_type = nullptr;
// Timers and counters for generating statistics
elapsedTimer CompileBroker::_t_total_compilation;
elapsedTimer CompileBroker::_t_osr_compilation;
elapsedTimer CompileBroker::_t_standard_compilation;
elapsedTimer CompileBroker::_t_invalidated_compilation;
elapsedTimer CompileBroker::_t_bailedout_compilation;
uint CompileBroker::_total_bailout_count = 0;
uint CompileBroker::_total_invalidated_count = 0;
uint CompileBroker::_total_compile_count = 0;
uint CompileBroker::_total_osr_compile_count = 0;
uint CompileBroker::_total_standard_compile_count = 0;
uint CompileBroker::_total_compiler_stopped_count = 0;
uint CompileBroker::_total_compiler_restarted_count = 0;
uint CompileBroker::_sum_osr_bytes_compiled = 0;
uint CompileBroker::_sum_standard_bytes_compiled = 0;
uint CompileBroker::_sum_nmethod_size = 0;
uint CompileBroker::_sum_nmethod_code_size = 0;
jlong CompileBroker::_peak_compilation_time = 0;
CompilerStatistics CompileBroker::_stats_per_level[CompLevel_full_optimization];
CompileQueue* CompileBroker::_c2_compile_queue = nullptr;
CompileQueue* CompileBroker::_c1_compile_queue = nullptr;
bool compileBroker_init() {
if (LogEvents) {
CompilationLog::init();
}
// init directives stack, adding default directive
DirectivesStack::init();
if (DirectivesParser::has_file()) {
return DirectivesParser::parse_from_flag();
} else if (CompilerDirectivesPrint) {
// Print default directive even when no other was added
DirectivesStack::print(tty);
}
return true;
}
CompileTaskWrapper::CompileTaskWrapper(CompileTask* task) {
CompilerThread* thread = CompilerThread::current();
thread->set_task(task);
CompileLog* log = thread->log();
if (log != nullptr && !task->is_unloaded()) task->log_task_start(log);
}
CompileTaskWrapper::~CompileTaskWrapper() {
CompilerThread* thread = CompilerThread::current();
CompileTask* task = thread->task();
CompileLog* log = thread->log();
if (log != nullptr && !task->is_unloaded()) task->log_task_done(log);
thread->set_task(nullptr);
thread->set_env(nullptr);
if (task->is_blocking()) {
bool free_task = false;
{
MutexLocker notifier(thread, task->lock());
task->mark_complete();
#if INCLUDE_JVMCI
if (CompileBroker::compiler(task->comp_level())->is_jvmci()) {
if (!task->has_waiter()) {
// The waiting thread timed out and thus did not free the task.
free_task = true;
}
task->set_blocking_jvmci_compile_state(nullptr);
}
#endif
if (!free_task) {
// Notify the waiting thread that the compilation has completed
// so that it can free the task.
task->lock()->notify_all();
}
}
if (free_task) {
// The task can only be freed once the task lock is released.
CompileTask::free(task);
}
} else {
task->mark_complete();
// By convention, the compiling thread is responsible for
// recycling a non-blocking CompileTask.
CompileTask::free(task);
}
}
/**
* Check if a CompilerThread can be removed and update count if requested.
*/
bool CompileBroker::can_remove(CompilerThread *ct, bool do_it) {
assert(UseDynamicNumberOfCompilerThreads, "or shouldn't be here");
if (!ReduceNumberOfCompilerThreads) return false;
AbstractCompiler *compiler = ct->compiler();
int compiler_count = compiler->num_compiler_threads();
bool c1 = compiler->is_c1();
// Keep at least 1 compiler thread of each type.
if (compiler_count < 2) return false;
// Keep thread alive for at least some time.
if (ct->idle_time_millis() < (c1 ? 500 : 100)) return false;
#if INCLUDE_JVMCI
if (compiler->is_jvmci() && !UseJVMCINativeLibrary) {
// Handles for JVMCI thread objects may get released concurrently.
if (do_it) {
assert(CompileThread_lock->owner() == ct, "must be holding lock");
} else {
// Skip check if it's the last thread and let caller check again.
return true;
}
}
#endif
// We only allow the last compiler thread of each type to get removed.
jobject last_compiler = c1 ? compiler1_object(compiler_count - 1)
: compiler2_object(compiler_count - 1);
if (ct->threadObj() == JNIHandles::resolve_non_null(last_compiler)) {
if (do_it) {
assert_locked_or_safepoint(CompileThread_lock); // Update must be consistent.
compiler->set_num_compiler_threads(compiler_count - 1);
#if INCLUDE_JVMCI
if (compiler->is_jvmci() && !UseJVMCINativeLibrary) {
// Old j.l.Thread object can die when no longer referenced elsewhere.
JNIHandles::destroy_global(compiler2_object(compiler_count - 1));
_compiler2_objects[compiler_count - 1] = nullptr;
}
#endif
}
return true;
}
return false;
}
/**
* Add a CompileTask to a CompileQueue.
*/
void CompileQueue::add(CompileTask* task) {
assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
task->set_next(nullptr);
task->set_prev(nullptr);
if (_last == nullptr) {
// The compile queue is empty.
assert(_first == nullptr, "queue is empty");
_first = task;
_last = task;
} else {
// Append the task to the queue.
assert(_last->next() == nullptr, "not last");
_last->set_next(task);
task->set_prev(_last);
_last = task;
}
++_size;
++_total_added;
if (_size > _peak_size) {
_peak_size = _size;
}
// Mark the method as being in the compile queue.
task->method()->set_queued_for_compilation();
if (CIPrintCompileQueue) {
print_tty();
}
if (LogCompilation && xtty != nullptr) {
task->log_task_queued();
}
// Notify CompilerThreads that a task is available.
MethodCompileQueue_lock->notify_all();
}
/**
* Empties compilation queue by putting all compilation tasks onto
* a freelist. Furthermore, the method wakes up all threads that are
* waiting on a compilation task to finish. This can happen if background
* compilation is disabled.
*/
void CompileQueue::free_all() {
MutexLocker mu(MethodCompileQueue_lock);
CompileTask* next = _first;
// Iterate over all tasks in the compile queue
while (next != nullptr) {
CompileTask* current = next;
next = current->next();
{
// Wake up thread that blocks on the compile task.
MutexLocker ct_lock(current->lock());
current->lock()->notify();
}
// Put the task back on the freelist.
CompileTask::free(current);
}
_first = nullptr;
_last = nullptr;
// Wake up all threads that block on the queue.
MethodCompileQueue_lock->notify_all();
}
/**
* Get the next CompileTask from a CompileQueue
*/
CompileTask* CompileQueue::get(CompilerThread* thread) {
// save methods from RedefineClasses across safepoint
// across MethodCompileQueue_lock below.
methodHandle save_method;
methodHandle save_hot_method;
MonitorLocker locker(MethodCompileQueue_lock);
// If _first is null we have no more compile jobs. There are two reasons for
// having no compile jobs: First, we compiled everything we wanted. Second,
// we ran out of code cache so compilation has been disabled. In the latter
// case we perform code cache sweeps to free memory such that we can re-enable
// compilation.
while (_first == nullptr) {
// Exit loop if compilation is disabled forever
if (CompileBroker::is_compilation_disabled_forever()) {
return nullptr;
}
AbstractCompiler* compiler = thread->compiler();
guarantee(compiler != nullptr, "Compiler object must exist");
compiler->on_empty_queue(this, thread);
if (_first != nullptr) {
// The call to on_empty_queue may have temporarily unlocked the MCQ lock
// so check again whether any tasks were added to the queue.
break;
}
// If there are no compilation tasks and we can compile new jobs
// (i.e., there is enough free space in the code cache) there is
// no need to invoke the GC.
// We need a timed wait here, since compiler threads can exit if compilation
// is disabled forever. We use 5 seconds wait time; the exiting of compiler threads
// is not critical and we do not want idle compiler threads to wake up too often.
locker.wait(5*1000);
if (UseDynamicNumberOfCompilerThreads && _first == nullptr) {
// Still nothing to compile. Give caller a chance to stop this thread.
if (CompileBroker::can_remove(CompilerThread::current(), false)) return nullptr;
}
}
if (CompileBroker::is_compilation_disabled_forever()) {
return nullptr;
}
CompileTask* task;
{
NoSafepointVerifier nsv;
task = CompilationPolicy::select_task(this);
if (task != nullptr) {
task = task->select_for_compilation();
}
}
if (task != nullptr) {
// Save method pointers across unlock safepoint. The task is removed from
// the compilation queue, which is walked during RedefineClasses.
Thread* thread = Thread::current();
save_method = methodHandle(thread, task->method());
save_hot_method = methodHandle(thread, task->hot_method());
remove(task);
}
purge_stale_tasks(); // may temporarily release MCQ lock
return task;
}
// Clean & deallocate stale compile tasks.
// Temporarily releases MethodCompileQueue lock.
void CompileQueue::purge_stale_tasks() {
assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
if (_first_stale != nullptr) {
// Stale tasks are purged when MCQ lock is released,
// but _first_stale updates are protected by MCQ lock.
// Once task processing starts and MCQ lock is released,
// other compiler threads can reuse _first_stale.
CompileTask* head = _first_stale;
_first_stale = nullptr;
{
MutexUnlocker ul(MethodCompileQueue_lock);
for (CompileTask* task = head; task != nullptr; ) {
CompileTask* next_task = task->next();
CompileTaskWrapper ctw(task); // Frees the task
task->set_failure_reason("stale task");
task = next_task;
}
}
}
}
void CompileQueue::remove(CompileTask* task) {
assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
if (task->prev() != nullptr) {
task->prev()->set_next(task->next());
} else {
// max is the first element
assert(task == _first, "Sanity");
_first = task->next();
}
if (task->next() != nullptr) {
task->next()->set_prev(task->prev());
} else {
// max is the last element
assert(task == _last, "Sanity");
_last = task->prev();
}
--_size;
++_total_removed;
}
void CompileQueue::remove_and_mark_stale(CompileTask* task) {
assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
remove(task);
// Enqueue the task for reclamation (should be done outside MCQ lock)
task->set_next(_first_stale);
task->set_prev(nullptr);
_first_stale = task;
}
// methods in the compile queue need to be marked as used on the stack
// so that they don't get reclaimed by Redefine Classes
void CompileQueue::mark_on_stack() {
CompileTask* task = _first;
while (task != nullptr) {
task->mark_on_stack();
task = task->next();
}
}
CompileQueue* CompileBroker::compile_queue(int comp_level) {
if (is_c2_compile(comp_level)) return _c2_compile_queue;
if (is_c1_compile(comp_level)) return _c1_compile_queue;
return nullptr;
}
CompileQueue* CompileBroker::c1_compile_queue() {
return _c1_compile_queue;
}
CompileQueue* CompileBroker::c2_compile_queue() {
return _c2_compile_queue;
}
void CompileBroker::print_compile_queues(outputStream* st) {
st->print_cr("Current compiles: ");
char buf[2000];
int buflen = sizeof(buf);
Threads::print_threads_compiling(st, buf, buflen, /* short_form = */ true);
st->cr();
if (_c1_compile_queue != nullptr) {
_c1_compile_queue->print(st);
}
if (_c2_compile_queue != nullptr) {
_c2_compile_queue->print(st);
}
}
void CompileQueue::print(outputStream* st) {
assert_locked_or_safepoint(MethodCompileQueue_lock);
st->print_cr("%s:", name());
CompileTask* task = _first;
if (task == nullptr) {
st->print_cr("Empty");
} else {
while (task != nullptr) {
task->print(st, nullptr, true, true);
task = task->next();
}
}
st->cr();
}
void CompileQueue::print_tty() {
stringStream ss;
// Dump the compile queue into a buffer before locking the tty
print(&ss);
{
ttyLocker ttyl;
tty->print("%s", ss.freeze());
}
}
CompilerCounters::CompilerCounters() {
_current_method[0] = '\0';
_compile_type = CompileBroker::no_compile;
}
#if INCLUDE_JFR && COMPILER2_OR_JVMCI
// It appends new compiler phase names to growable array phase_names(a new CompilerPhaseType mapping
// in compiler/compilerEvent.cpp) and registers it with its serializer.
//
// c2 uses explicit CompilerPhaseType idToPhase mapping in opto/phasetype.hpp,
// so if c2 is used, it should be always registered first.
// This function is called during vm initialization.
static void register_jfr_phasetype_serializer(CompilerType compiler_type) {
ResourceMark rm;
static bool first_registration = true;
if (compiler_type == compiler_jvmci) {
CompilerEvent::PhaseEvent::get_phase_id("NOT_A_PHASE_NAME", false, false, false);
first_registration = false;
#ifdef COMPILER2
} else if (compiler_type == compiler_c2) {
assert(first_registration, "invariant"); // c2 must be registered first.
for (int i = 0; i < PHASE_NUM_TYPES; i++) {
const char* phase_name = CompilerPhaseTypeHelper::to_description((CompilerPhaseType) i);
CompilerEvent::PhaseEvent::get_phase_id(phase_name, false, false, false);
}
first_registration = false;
#endif // COMPILER2
}
}
#endif // INCLUDE_JFR && COMPILER2_OR_JVMCI
// ------------------------------------------------------------------
// CompileBroker::compilation_init
//
// Initialize the Compilation object
void CompileBroker::compilation_init(JavaThread* THREAD) {
// No need to initialize compilation system if we do not use it.
if (!UseCompiler) {
return;
}
// Set the interface to the current compiler(s).
_c1_count = CompilationPolicy::c1_count();
_c2_count = CompilationPolicy::c2_count();
#if INCLUDE_JVMCI
if (EnableJVMCI) {
// This is creating a JVMCICompiler singleton.
JVMCICompiler* jvmci = new JVMCICompiler();
if (UseJVMCICompiler) {
_compilers[1] = jvmci;
if (FLAG_IS_DEFAULT(JVMCIThreads)) {
if (BootstrapJVMCI) {
// JVMCI will bootstrap so give it more threads
_c2_count = MIN2(32, os::active_processor_count());
}
} else {
_c2_count = JVMCIThreads;
}
if (FLAG_IS_DEFAULT(JVMCIHostThreads)) {
} else {
#ifdef COMPILER1
_c1_count = JVMCIHostThreads;
#endif // COMPILER1
}
}
}
#endif // INCLUDE_JVMCI
#ifdef COMPILER1
if (_c1_count > 0) {
_compilers[0] = new Compiler();
}
#endif // COMPILER1
#ifdef COMPILER2
if (true JVMCI_ONLY( && !UseJVMCICompiler)) {
if (_c2_count > 0) {
_compilers[1] = new C2Compiler();
// Register c2 first as c2 CompilerPhaseType idToPhase mapping is explicit.
// idToPhase mapping for c2 is in opto/phasetype.hpp
JFR_ONLY(register_jfr_phasetype_serializer(compiler_c2);)
}
}
#endif // COMPILER2
#if INCLUDE_JVMCI
// Register after c2 registration.
// JVMCI CompilerPhaseType idToPhase mapping is dynamic.
if (EnableJVMCI) {
JFR_ONLY(register_jfr_phasetype_serializer(compiler_jvmci);)
}
#endif // INCLUDE_JVMCI
if (CompilerOracle::should_collect_memstat()) {
CompilationMemoryStatistic::initialize();
}
// Start the compiler thread(s)
init_compiler_threads();
// totalTime performance counter is always created as it is required
// by the implementation of java.lang.management.CompilationMXBean.
{
// Ensure OOM leads to vm_exit_during_initialization.
EXCEPTION_MARK;
_perf_total_compilation =
PerfDataManager::create_counter(JAVA_CI, "totalTime",
PerfData::U_Ticks, CHECK);
}
if (UsePerfData) {
EXCEPTION_MARK;
// create the jvmstat performance counters
_perf_osr_compilation =
PerfDataManager::create_counter(SUN_CI, "osrTime",
PerfData::U_Ticks, CHECK);
_perf_standard_compilation =
PerfDataManager::create_counter(SUN_CI, "standardTime",
PerfData::U_Ticks, CHECK);
_perf_total_bailout_count =
PerfDataManager::create_counter(SUN_CI, "totalBailouts",
PerfData::U_Events, CHECK);
_perf_total_invalidated_count =
PerfDataManager::create_counter(SUN_CI, "totalInvalidates",
PerfData::U_Events, CHECK);
_perf_total_compile_count =
PerfDataManager::create_counter(SUN_CI, "totalCompiles",
PerfData::U_Events, CHECK);
_perf_total_osr_compile_count =
PerfDataManager::create_counter(SUN_CI, "osrCompiles",
PerfData::U_Events, CHECK);
_perf_total_standard_compile_count =
PerfDataManager::create_counter(SUN_CI, "standardCompiles",
PerfData::U_Events, CHECK);
_perf_sum_osr_bytes_compiled =
PerfDataManager::create_counter(SUN_CI, "osrBytes",
PerfData::U_Bytes, CHECK);
_perf_sum_standard_bytes_compiled =
PerfDataManager::create_counter(SUN_CI, "standardBytes",
PerfData::U_Bytes, CHECK);
_perf_sum_nmethod_size =
PerfDataManager::create_counter(SUN_CI, "nmethodSize",
PerfData::U_Bytes, CHECK);
_perf_sum_nmethod_code_size =
PerfDataManager::create_counter(SUN_CI, "nmethodCodeSize",
PerfData::U_Bytes, CHECK);
_perf_last_method =
PerfDataManager::create_string_variable(SUN_CI, "lastMethod",
CompilerCounters::cmname_buffer_length,
"", CHECK);
_perf_last_failed_method =
PerfDataManager::create_string_variable(SUN_CI, "lastFailedMethod",
CompilerCounters::cmname_buffer_length,
"", CHECK);
_perf_last_invalidated_method =
PerfDataManager::create_string_variable(SUN_CI, "lastInvalidatedMethod",
CompilerCounters::cmname_buffer_length,
"", CHECK);
_perf_last_compile_type =
PerfDataManager::create_variable(SUN_CI, "lastType",
PerfData::U_None,
(jlong)CompileBroker::no_compile,
CHECK);
_perf_last_compile_size =
PerfDataManager::create_variable(SUN_CI, "lastSize",
PerfData::U_Bytes,
(jlong)CompileBroker::no_compile,
CHECK);
_perf_last_failed_type =
PerfDataManager::create_variable(SUN_CI, "lastFailedType",
PerfData::U_None,
(jlong)CompileBroker::no_compile,
CHECK);
_perf_last_invalidated_type =
PerfDataManager::create_variable(SUN_CI, "lastInvalidatedType",
PerfData::U_None,
(jlong)CompileBroker::no_compile,
CHECK);
}
_initialized = true;
}
#if defined(ASSERT) && COMPILER2_OR_JVMCI
// Stress testing. Dedicated threads revert optimizations based on escape analysis concurrently to
// the running java application. Configured with vm options DeoptimizeObjectsALot*.
class DeoptimizeObjectsALotThread : public JavaThread {
static void deopt_objs_alot_thread_entry(JavaThread* thread, TRAPS);
void deoptimize_objects_alot_loop_single();
void deoptimize_objects_alot_loop_all();
public:
DeoptimizeObjectsALotThread() : JavaThread(&deopt_objs_alot_thread_entry) { }
bool is_hidden_from_external_view() const { return true; }
};
// Entry for DeoptimizeObjectsALotThread. The threads are started in
// CompileBroker::init_compiler_threads() iff DeoptimizeObjectsALot is enabled
void DeoptimizeObjectsALotThread::deopt_objs_alot_thread_entry(JavaThread* thread, TRAPS) {
DeoptimizeObjectsALotThread* dt = ((DeoptimizeObjectsALotThread*) thread);
bool enter_single_loop;
{
MonitorLocker ml(dt, EscapeBarrier_lock, Mutex::_no_safepoint_check_flag);
static int single_thread_count = 0;
enter_single_loop = single_thread_count++ < DeoptimizeObjectsALotThreadCountSingle;
}
if (enter_single_loop) {
dt->deoptimize_objects_alot_loop_single();
} else {
dt->deoptimize_objects_alot_loop_all();
}
}
// Execute EscapeBarriers in an endless loop to revert optimizations based on escape analysis. Each
// barrier targets a single thread which is selected round robin.
void DeoptimizeObjectsALotThread::deoptimize_objects_alot_loop_single() {
HandleMark hm(this);
while (true) {
for (JavaThreadIteratorWithHandle jtiwh; JavaThread *deoptee_thread = jtiwh.next(); ) {
{ // Begin new scope for escape barrier
HandleMarkCleaner hmc(this);
ResourceMark rm(this);
EscapeBarrier eb(true, this, deoptee_thread);
eb.deoptimize_objects(100);
}
// Now sleep after the escape barriers destructor resumed deoptee_thread.
sleep(DeoptimizeObjectsALotInterval);
}
}
}
// Execute EscapeBarriers in an endless loop to revert optimizations based on escape analysis. Each
// barrier targets all java threads in the vm at once.
void DeoptimizeObjectsALotThread::deoptimize_objects_alot_loop_all() {
HandleMark hm(this);
while (true) {
{ // Begin new scope for escape barrier
HandleMarkCleaner hmc(this);
ResourceMark rm(this);
EscapeBarrier eb(true, this);
eb.deoptimize_objects_all_threads();
}
// Now sleep after the escape barriers destructor resumed the java threads.
sleep(DeoptimizeObjectsALotInterval);
}
}
#endif // defined(ASSERT) && COMPILER2_OR_JVMCI
JavaThread* CompileBroker::make_thread(ThreadType type, jobject thread_handle, CompileQueue* queue, AbstractCompiler* comp, JavaThread* THREAD) {
Handle thread_oop(THREAD, JNIHandles::resolve_non_null(thread_handle));
if (java_lang_Thread::thread(thread_oop()) != nullptr) {
assert(type == compiler_t, "should only happen with reused compiler threads");
// The compiler thread hasn't actually exited yet so don't try to reuse it
return nullptr;
}
JavaThread* new_thread = nullptr;
switch (type) {
case compiler_t:
assert(comp != nullptr, "Compiler instance missing.");
if (!InjectCompilerCreationFailure || comp->num_compiler_threads() == 0) {
CompilerCounters* counters = new CompilerCounters();
new_thread = new CompilerThread(queue, counters);
}
break;
#if defined(ASSERT) && COMPILER2_OR_JVMCI
case deoptimizer_t:
new_thread = new DeoptimizeObjectsALotThread();
break;
#endif // ASSERT
default:
ShouldNotReachHere();
}
// At this point the new CompilerThread data-races with this startup
// thread (which is the main thread and NOT the VM thread).
// This means Java bytecodes being executed at startup can
// queue compile jobs which will run at whatever default priority the
// newly created CompilerThread runs at.
// At this point it may be possible that no osthread was created for the
// JavaThread due to lack of resources. We will handle that failure below.
// Also check new_thread so that static analysis is happy.
if (new_thread != nullptr && new_thread->osthread() != nullptr) {
if (type == compiler_t) {
CompilerThread::cast(new_thread)->set_compiler(comp);
}
// Note that we cannot call os::set_priority because it expects Java
// priorities and we are *explicitly* using OS priorities so that it's
// possible to set the compiler thread priority higher than any Java
// thread.
int native_prio = CompilerThreadPriority;
if (native_prio == -1) {
if (UseCriticalCompilerThreadPriority) {
native_prio = os::java_to_os_priority[CriticalPriority];
} else {
native_prio = os::java_to_os_priority[NearMaxPriority];
}
}
os::set_native_priority(new_thread, native_prio);
// Note that this only sets the JavaThread _priority field, which by
// definition is limited to Java priorities and not OS priorities.
JavaThread::start_internal_daemon(THREAD, new_thread, thread_oop, NearMaxPriority);
} else { // osthread initialization failure
if (UseDynamicNumberOfCompilerThreads && type == compiler_t
&& comp->num_compiler_threads() > 0) {
// The new thread is not known to Thread-SMR yet so we can just delete.
delete new_thread;
return nullptr;
} else {
vm_exit_during_initialization("java.lang.OutOfMemoryError",
os::native_thread_creation_failed_msg());
}
}
os::naked_yield(); // make sure that the compiler thread is started early (especially helpful on SOLARIS)
return new_thread;
}
static bool trace_compiler_threads() {
LogTarget(Debug, jit, thread) lt;
return TraceCompilerThreads || lt.is_enabled();
}
static jobject create_compiler_thread(AbstractCompiler* compiler, int i, TRAPS) {
char name_buffer[256];
os::snprintf_checked(name_buffer, sizeof(name_buffer), "%s CompilerThread%d", compiler->name(), i);
Handle thread_oop = JavaThread::create_system_thread_object(name_buffer, CHECK_NULL);
return JNIHandles::make_global(thread_oop);
}
static void print_compiler_threads(stringStream& msg) {
if (TraceCompilerThreads) {
tty->print_cr("%7d %s", (int)tty->time_stamp().milliseconds(), msg.as_string());
}
LogTarget(Debug, jit, thread) lt;
if (lt.is_enabled()) {
LogStream ls(lt);
ls.print_cr("%s", msg.as_string());
}
}
void CompileBroker::init_compiler_threads() {
// Ensure any exceptions lead to vm_exit_during_initialization.
EXCEPTION_MARK;
#if !defined(ZERO)
assert(_c2_count > 0 || _c1_count > 0, "No compilers?");
#endif // !ZERO
// Initialize the compilation queue
if (_c2_count > 0) {
const char* name = JVMCI_ONLY(UseJVMCICompiler ? "JVMCI compile queue" :) "C2 compile queue";
_c2_compile_queue = new CompileQueue(name);
_compiler2_objects = NEW_C_HEAP_ARRAY(jobject, _c2_count, mtCompiler);
_compiler2_logs = NEW_C_HEAP_ARRAY(CompileLog*, _c2_count, mtCompiler);
}
if (_c1_count > 0) {
_c1_compile_queue = new CompileQueue("C1 compile queue");
_compiler1_objects = NEW_C_HEAP_ARRAY(jobject, _c1_count, mtCompiler);
_compiler1_logs = NEW_C_HEAP_ARRAY(CompileLog*, _c1_count, mtCompiler);
}
for (int i = 0; i < _c2_count; i++) {
// Create a name for our thread.
jobject thread_handle = create_compiler_thread(_compilers[1], i, CHECK);
_compiler2_objects[i] = thread_handle;
_compiler2_logs[i] = nullptr;
if (!UseDynamicNumberOfCompilerThreads || i == 0) {
JavaThread *ct = make_thread(compiler_t, thread_handle, _c2_compile_queue, _compilers[1], THREAD);
assert(ct != nullptr, "should have been handled for initial thread");
_compilers[1]->set_num_compiler_threads(i + 1);
if (trace_compiler_threads()) {
ResourceMark rm;
ThreadsListHandle tlh; // name() depends on the TLH.
assert(tlh.includes(ct), "ct=" INTPTR_FORMAT " exited unexpectedly.", p2i(ct));
stringStream msg;
msg.print("Added initial compiler thread %s", ct->name());
print_compiler_threads(msg);
}
}
}
for (int i = 0; i < _c1_count; i++) {
// Create a name for our thread.
jobject thread_handle = create_compiler_thread(_compilers[0], i, CHECK);
_compiler1_objects[i] = thread_handle;
_compiler1_logs[i] = nullptr;
if (!UseDynamicNumberOfCompilerThreads || i == 0) {
JavaThread *ct = make_thread(compiler_t, thread_handle, _c1_compile_queue, _compilers[0], THREAD);
assert(ct != nullptr, "should have been handled for initial thread");
_compilers[0]->set_num_compiler_threads(i + 1);
if (trace_compiler_threads()) {
ResourceMark rm;
ThreadsListHandle tlh; // name() depends on the TLH.
assert(tlh.includes(ct), "ct=" INTPTR_FORMAT " exited unexpectedly.", p2i(ct));
stringStream msg;