jdk8-mips64-public/hotspot: comparison src/share/vm/jfr/leakprofiler/sampling/objectSampler.cpp

-:1258121876f8
+:8e875c964f41
 /*
-* Copyright (c) 2014, 2018, Oracle and/or its affiliates. All rights reserved.
+* Copyright (c) 2017, 2018, 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.
 #include "jfr/recorder/stacktrace/jfrStackTraceRepository.hpp"
 #include "jfr/support/jfrThreadLocal.hpp"
 #include "jfr/utilities/jfrTryLock.hpp"
 #include "memory/universe.hpp"
 #include "oops/oop.inline.hpp"
+#include "runtime/atomic.hpp"
+#include "runtime/orderAccess.hpp"
+#include "runtime/safepoint.hpp"
 #include "runtime/thread.hpp"
+static ObjectSampler* _instance = NULL;
+static ObjectSampler& instance() {
+assert(_instance != NULL, "invariant");
+return *_instance;
+}
 ObjectSampler::ObjectSampler(size_t size) :
 _priority_queue(new SamplePriorityQueue(size)),
 _list(new SampleList(size)),
 _last_sweep(JfrTicks::now()),
 _total_allocated(0),
 _threshold(0),
 _size(size),
-_tryLock(0),
 _dead_samples(false) {}
 ObjectSampler::~ObjectSampler() {
 delete _priority_queue;
 _priority_queue = NULL;
 delete _list;
 _list = NULL;
 }
-void ObjectSampler::add(HeapWord* obj, size_t allocated, JavaThread* thread) {
+bool ObjectSampler::create(size_t size) {
-assert(thread != NULL, "invariant");
+assert(SafepointSynchronize::is_at_safepoint(), "invariant");
-const traceid thread_id = thread->threadObj() != NULL ? thread->jfr_thread_local()->thread_id() : 0;
+assert(_instance == NULL, "invariant");
+_instance = new ObjectSampler(size);
+return _instance != NULL;
+}
+bool ObjectSampler::is_created() {
+return _instance != NULL;
+}
+ObjectSampler* ObjectSampler::sampler() {
+assert(is_created(), "invariant");
+return _instance;
+}
+void ObjectSampler::destroy() {
+assert(SafepointSynchronize::is_at_safepoint(), "invariant");
+if (_instance != NULL) {
+ObjectSampler* const sampler = _instance;
+_instance = NULL;
+delete sampler;
+}
+}
+static volatile int _lock = 0;
+ObjectSampler* ObjectSampler::acquire() {
+assert(is_created(), "invariant");
+while (Atomic::cmpxchg(1, &_lock, 0) == 1) {}
+return _instance;
+}
+void ObjectSampler::release() {
+assert(is_created(), "invariant");
+OrderAccess::fence();
+_lock = 0;
+}
+static traceid get_thread_id(JavaThread* thread) {
+assert(thread != NULL, "invariant");
+if (thread->threadObj() == NULL) {
+return 0;
+}
+const JfrThreadLocal* const tl = thread->jfr_thread_local();
+assert(tl != NULL, "invariant");
+if (!tl->has_thread_checkpoint()) {
+JfrCheckpointManager::create_thread_checkpoint(thread);
+}
+assert(tl->has_thread_checkpoint(), "invariant");
+return tl->thread_id();
+}
+// Populates the thread local stack frames, but does not add them
+// to the stacktrace repository (...yet, see stacktrace_id() below)
+//
+void ObjectSampler::fill_stacktrace(JfrStackTrace* stacktrace, JavaThread* thread) {
+assert(stacktrace != NULL, "invariant");
+assert(thread != NULL, "invariant");
+if (JfrEventSetting::has_stacktrace(EventOldObjectSample::eventId)) {
+JfrStackTraceRepository::fill_stacktrace_for(thread, stacktrace, 0);
+}
+}
+// We were successful in acquiring the try lock and have been selected for adding a sample.
+// Go ahead with installing our previously taken stacktrace into the stacktrace repository.
+//
+traceid ObjectSampler::stacktrace_id(const JfrStackTrace* stacktrace, JavaThread* thread) {
+assert(stacktrace != NULL, "invariant");
+assert(stacktrace->hash() != 0, "invariant");
+const traceid stacktrace_id = JfrStackTraceRepository::add(stacktrace, thread);
+thread->jfr_thread_local()->set_cached_stack_trace_id(stacktrace_id, stacktrace->hash());
+return stacktrace_id;
+}
+void ObjectSampler::sample(HeapWord* obj, size_t allocated, JavaThread* thread) {
+assert(thread != NULL, "invariant");
+assert(is_created(), "invariant");
+const traceid thread_id = get_thread_id(thread);
 if (thread_id == 0) {
 return;
 }
-assert(thread_id != 0, "invariant");
+const JfrThreadLocal* const tl = thread->jfr_thread_local();
+JfrStackTrace stacktrace(tl->stackframes(), tl->stackdepth());
-if (!thread->jfr_thread_local()->has_thread_checkpoint()) {
+fill_stacktrace(&stacktrace, thread);
-JfrCheckpointManager::create_thread_checkpoint(thread);
-assert(thread->jfr_thread_local()->has_thread_checkpoint(), "invariant");
+// try enter critical section
-}
+JfrTryLock tryLock(&_lock);
-traceid stack_trace_id = 0;
-unsigned int stack_trace_hash = 0;
-if (JfrEventSetting::has_stacktrace(EventOldObjectSample::eventId)) {
-stack_trace_id = JfrStackTraceRepository::record(thread, 0, &stack_trace_hash);
-thread->jfr_thread_local()->set_cached_stack_trace_id(stack_trace_id, stack_trace_hash);
-}
-JfrTryLock tryLock(&_tryLock);
 if (!tryLock.has_lock()) {
 if (LogJFR && Verbose) tty->print_cr("Skipping old object sample due to lock contention");
 return;
 }
+instance().add(obj, allocated, thread_id, &stacktrace, thread);
+}
+void ObjectSampler::add(HeapWord* obj, size_t allocated, traceid thread_id, JfrStackTrace* stacktrace, JavaThread* thread) {
+assert(stacktrace != NULL, "invariant");
+assert(thread_id != 0, "invariant");
+assert(thread != NULL, "invariant");
+assert(thread->jfr_thread_local()->has_thread_checkpoint(), "invariant");
 if (_dead_samples) {
 scavenge();
 assert(!_dead_samples, "invariant");
 }
 } else {
 sample = _list->get();
 }
 assert(sample != NULL, "invariant");
-assert(thread_id != 0, "invariant");
 sample->set_thread_id(thread_id);
 sample->set_thread_checkpoint(thread->jfr_thread_local()->thread_checkpoint());
-if (stack_trace_id != 0) {
+const unsigned int stacktrace_hash = stacktrace->hash();
-sample->set_stack_trace_id(stack_trace_id);
+if (stacktrace_hash != 0) {
-sample->set_stack_trace_hash(stack_trace_hash);
+sample->set_stack_trace_id(stacktrace_id(stacktrace, thread));
+sample->set_stack_trace_hash(stacktrace_hash);
 }
 sample->set_span(allocated);
 sample->set_object((oop)obj);
 sample->set_allocated(allocated);
 sample->set_allocation_time(JfrTicks::now());
 sample->set_heap_used_at_last_gc(Universe::get_heap_used_at_last_gc());
 _priority_queue->push(sample);
 }
-const ObjectSample* ObjectSampler::last() const {
+void ObjectSampler::scavenge() {
-return _list->last();
-}
-const ObjectSample* ObjectSampler::first() const {
-return _list->first();
-}
-const ObjectSample* ObjectSampler::last_resolved() const {
-return _list->last_resolved();
-}
-void ObjectSampler::set_last_resolved(const ObjectSample* sample) {
-_list->set_last_resolved(sample);
-}
-void ObjectSampler::oops_do(BoolObjectClosure* is_alive, OopClosure* f) {
 ObjectSample* current = _list->last();
 while (current != NULL) {
 ObjectSample* next = current->next();
-if (!current->is_dead()) {
+if (current->is_dead()) {
-if (is_alive->do_object_b(current->object())) {
+remove_dead(current);
-// The weakly referenced object is alive, update pointer
-f->do_oop(const_cast<oop*>(current->object_addr()));
-} else {
-current->set_dead();
-_dead_samples = true;
-}
 }
 current = next;
 }
-_last_sweep = JfrTicks::now();
+_dead_samples = false;
 }
 void ObjectSampler::remove_dead(ObjectSample* sample) {
 assert(sample != NULL, "invariant");
 assert(sample->is_dead(), "invariant");
 }
 _priority_queue->remove(sample);
 _list->release(sample);
 }
-void ObjectSampler::scavenge() {
+void ObjectSampler::oops_do(BoolObjectClosure* is_alive, OopClosure* f) {
-ObjectSample* current = _list->last();
+assert(is_created(), "invariant");
+assert(SafepointSynchronize::is_at_safepoint(), "invariant");
+ObjectSampler& sampler = instance();
+ObjectSample* current = sampler._list->last();
 while (current != NULL) {
 ObjectSample* next = current->next();
-if (current->is_dead()) {
+if (!current->is_dead()) {
-remove_dead(current);
+if (is_alive->do_object_b(current->object())) {
+// The weakly referenced object is alive, update pointer
+f->do_oop(const_cast<oop*>(current->object_addr()));
+} else {
+current->set_dead();
+sampler._dead_samples = true;
+}
 }
 current = next;
 }
-_dead_samples = false;
+sampler._last_sweep = JfrTicks::now();
+}
+const ObjectSample* ObjectSampler::last() const {
+return _list->last();
+}
+const ObjectSample* ObjectSampler::first() const {
+return _list->first();
+}
+const ObjectSample* ObjectSampler::last_resolved() const {
+return _list->last_resolved();
+}
+void ObjectSampler::set_last_resolved(const ObjectSample* sample) {
+_list->set_last_resolved(sample);
 }
 int ObjectSampler::item_count() const {
 return _priority_queue->count();
 }
 }
 ObjectSample* ObjectSampler::item_at(int index) {
 return const_cast<ObjectSample*>(
 const_cast<const ObjectSampler*>(this)->item_at(index)
 );
 }
 const JfrTicks& ObjectSampler::last_sweep() const {
 return _last_sweep;
 }

Mercurial > jdk8-mips64-public > hotspot / file comparison

comparison: src/share/vm/jfr/leakprofiler/sampling/objectSampler.cpp

src/share/vm/jfr/leakprofiler/sampling/objectSampler.cpp