jdk8-mips64-public/hotspot: src/share/vm/jfr/recorder/checkpoint/types/jfrThreadGroup.cpp@a248d0be1309 (annotated)

src/share/vm/jfr/recorder/checkpoint/types/jfrThreadGroup.cpp@a248d0be1309 (annotated)

src/share/vm/jfr/recorder/checkpoint/types/jfrThreadGroup.cpp

Mon, 19 Aug 2019 10:11:31 +0200

author: neugens
date: Mon, 19 Aug 2019 10:11:31 +0200
changeset 9861: a248d0be1309
parent 9858: b985cbb00e68
child 9880: 3549c2f110d2
permissions: -rw-r--r--

8229401: Fix JFR code cache test failures
8223689: Add JFR Thread Sampling Support
8223690: Add JFR BiasedLock Event Support
8223691: Add JFR G1 Region Type Change Event Support
8223692: Add JFR G1 Heap Summary Event Support
Summary: Backport JFR from JDK11, additional fixes
Reviewed-by: neugens, apetushkov
Contributed-by: denghui.ddh@alibaba-inc.com

 /*
  * Copyright (c) 2016, 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.
  *
  * 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 "jfr/recorder/checkpoint/jfrCheckpointWriter.hpp"
 #include "jfr/recorder/checkpoint/types/jfrThreadGroup.hpp"
 #include "jfr/utilities/jfrResourceManager.hpp"
 #include "jfr/utilities/jfrTypes.hpp"
 #include "runtime/handles.inline.hpp"
 #include "runtime/jniHandles.hpp"
 #include "runtime/safepoint.hpp"
 #include "runtime/semaphore.hpp"
 #include "utilities/growableArray.hpp"
 class ThreadGroupExclusiveAccess : public StackObj {
  private:
   static Semaphore _mutex_semaphore;
  public:
   ThreadGroupExclusiveAccess() { _mutex_semaphore.wait(); }
   ~ThreadGroupExclusiveAccess() { _mutex_semaphore.signal(); }
 };
 Semaphore ThreadGroupExclusiveAccess::_mutex_semaphore(1);
 JfrThreadGroup* JfrThreadGroup::_instance = NULL;
 class JfrThreadGroupPointers : public ResourceObj {
  private:
   const Handle _thread_group_handle;
   jweak _thread_group_weak_ref;
  public:
   JfrThreadGroupPointers(Handle thread_group_handle, jweak thread_group_weak_ref);
   Handle thread_group_handle() const;
   jweak thread_group_weak_ref() const;
   oopDesc* const thread_group_oop() const;
   jweak transfer_weak_global_handle_ownership();
   void clear_weak_ref();
 };
 JfrThreadGroupPointers::JfrThreadGroupPointers(Handle thread_group_handle, jweak thread_group_weak_ref) :
   _thread_group_handle(thread_group_handle),
   _thread_group_weak_ref(thread_group_weak_ref) {}
 Handle JfrThreadGroupPointers::thread_group_handle() const {
   return _thread_group_handle;
 }
 jweak JfrThreadGroupPointers::thread_group_weak_ref() const {
   return _thread_group_weak_ref;
 }
 oopDesc* const JfrThreadGroupPointers::thread_group_oop() const {
   assert(_thread_group_weak_ref == NULL ||
          JNIHandles::resolve_non_null(_thread_group_weak_ref) == _thread_group_handle(), "invariant");
   return _thread_group_handle();
 }
 jweak JfrThreadGroupPointers::transfer_weak_global_handle_ownership() {
   jweak temp = _thread_group_weak_ref;
   _thread_group_weak_ref = NULL;
   return temp;
 }
 void JfrThreadGroupPointers::clear_weak_ref() {
   if (NULL != _thread_group_weak_ref) {
     JNIHandles::destroy_weak_global(_thread_group_weak_ref);
   }
 }
 class JfrThreadGroupsHelper : public ResourceObj {
  private:
   static const int invalid_iterator_pos = -1;
   GrowableArray<JfrThreadGroupPointers*>* _thread_group_hierarchy;
   int _current_iterator_pos;
   int populate_thread_group_hierarchy(const JavaThread* jt, Thread* current);
   JfrThreadGroupPointers& at(int index);
  public:
   JfrThreadGroupsHelper(const JavaThread* jt, Thread* current);
   ~JfrThreadGroupsHelper();
   JfrThreadGroupPointers& next();
   bool is_valid() const;
   bool has_next() const;
 };
 JfrThreadGroupsHelper::JfrThreadGroupsHelper(const JavaThread* jt, Thread* current) {
   _thread_group_hierarchy = new GrowableArray<JfrThreadGroupPointers*>(10, false, mtTracing);
   _current_iterator_pos = populate_thread_group_hierarchy(jt, current) - 1;
 }
 JfrThreadGroupsHelper::~JfrThreadGroupsHelper() {
   assert(_current_iterator_pos == invalid_iterator_pos, "invariant");
   for (int i = 0; i < _thread_group_hierarchy->length(); ++i) {
     _thread_group_hierarchy->at(i)->clear_weak_ref();
   }
 }
 JfrThreadGroupPointers& JfrThreadGroupsHelper::at(int index) {
   assert(_thread_group_hierarchy != NULL, "invariant");
   assert(index > invalid_iterator_pos && index < _thread_group_hierarchy->length(), "invariant");
   return *(_thread_group_hierarchy->at(index));
 }
 bool JfrThreadGroupsHelper::has_next() const {
   return _current_iterator_pos > invalid_iterator_pos;
 }
 bool JfrThreadGroupsHelper::is_valid() const {
   return (_thread_group_hierarchy != NULL && _thread_group_hierarchy->length() > 0);
 }
 JfrThreadGroupPointers& JfrThreadGroupsHelper::next() {
   assert(is_valid(), "invariant");
   return at(_current_iterator_pos--);
 }
 /*
  * If not at a safepoint, we create global weak references for
  * all reachable threadgroups for this thread.
  * If we are at a safepoint, the caller is the VMThread during
  * JFR checkpointing. It can use naked oops, because nothing
  * will move before the list of threadgroups is cleared and
  * mutator threads restarted. The threadgroup list is cleared
  * later by the VMThread as one of the final steps in JFR checkpointing
  * (not here).
  */
 int JfrThreadGroupsHelper::populate_thread_group_hierarchy(const JavaThread* jt, Thread* current) {
   assert(jt != NULL && jt->is_Java_thread(), "invariant");
   assert(current != NULL, "invariant");
   assert(_thread_group_hierarchy != NULL, "invariant");
   // immediate thread group
   Handle thread_group_handle(current, java_lang_Thread::threadGroup(jt->threadObj()));
   if (thread_group_handle == NULL) {
     return 0;
   }
   const bool use_weak_handles = !SafepointSynchronize::is_at_safepoint();
   jweak thread_group_weak_ref = use_weak_handles ? JNIHandles::make_weak_global(thread_group_handle) : NULL;
   JfrThreadGroupPointers* thread_group_pointers = new JfrThreadGroupPointers(thread_group_handle, thread_group_weak_ref);
   _thread_group_hierarchy->append(thread_group_pointers);
   // immediate parent thread group
   oop parent_thread_group_obj = java_lang_ThreadGroup::parent(thread_group_handle());
   Handle parent_thread_group_handle(current, parent_thread_group_obj);
   // and check parents parents...
   while (!(parent_thread_group_handle == NULL)) {
     const jweak parent_group_weak_ref = use_weak_handles ? JNIHandles::make_weak_global(parent_thread_group_handle) : NULL;
     thread_group_pointers = new JfrThreadGroupPointers(parent_thread_group_handle, parent_group_weak_ref);
     _thread_group_hierarchy->append(thread_group_pointers);
     parent_thread_group_obj = java_lang_ThreadGroup::parent(parent_thread_group_handle());
     parent_thread_group_handle = Handle(current, parent_thread_group_obj);
   }
   return _thread_group_hierarchy->length();
 }
 static traceid next_id() {
   static traceid _current_threadgroup_id = 0;
   return ++_current_threadgroup_id;
 }
 class JfrThreadGroup::JfrThreadGroupEntry : public JfrCHeapObj {
   friend class JfrThreadGroup;
  private:
   traceid _thread_group_id;
   traceid _parent_group_id;
   char* _thread_group_name; // utf8 format
   // If an entry is created during a safepoint, the
   // _thread_group_oop contains a direct oop to
   // the java.lang.ThreadGroup object.
   // If an entry is created on javathread exit time (not at safepoint),
   // _thread_group_weak_ref contains a JNI weak global handle
   // indirection to the java.lang.ThreadGroup object.
   // Note: we cannot use a union here since CHECK_UNHANDLED_OOPS makes oop have
   //       a ctor which isn't allowed in a union by the SunStudio compiler
   oop _thread_group_oop;
   jweak _thread_group_weak_ref;
   JfrThreadGroupEntry(const char* tgstr, JfrThreadGroupPointers& ptrs);
   ~JfrThreadGroupEntry();
   traceid thread_group_id() const { return _thread_group_id; }
   void set_thread_group_id(traceid tgid) { _thread_group_id = tgid; }
   const char* const thread_group_name() const { return _thread_group_name; }
   void set_thread_group_name(const char* tgname);
   traceid parent_group_id() const { return _parent_group_id; }
   void set_parent_group_id(traceid pgid) { _parent_group_id = pgid; }
   void set_thread_group(JfrThreadGroupPointers& ptrs);
   bool is_equal(const JfrThreadGroupPointers& ptrs) const;
   const oop thread_group() const;
 };
 JfrThreadGroup::JfrThreadGroupEntry::JfrThreadGroupEntry(const char* tgname, JfrThreadGroupPointers& ptrs) :
   _thread_group_id(0),
   _parent_group_id(0),
   _thread_group_name(NULL),
   _thread_group_oop(NULL),
   _thread_group_weak_ref(NULL) {
   set_thread_group_name(tgname);
   set_thread_group(ptrs);
 }
 JfrThreadGroup::JfrThreadGroupEntry::~JfrThreadGroupEntry() {
   if (_thread_group_name != NULL) {
     JfrCHeapObj::free(_thread_group_name, strlen(_thread_group_name) + 1);
   }
   if (_thread_group_weak_ref != NULL) {
     JNIHandles::destroy_weak_global(_thread_group_weak_ref);
   }
 }
 void JfrThreadGroup::JfrThreadGroupEntry::set_thread_group_name(const char* tgname) {
   assert(_thread_group_name == NULL, "invariant");
   if (tgname != NULL) {
     size_t len = strlen(tgname);
     _thread_group_name = JfrCHeapObj::new_array<char>(len+1);
     strncpy(_thread_group_name, tgname, len);
     _thread_group_name[len] = '\0';
   }
 }
 const oop JfrThreadGroup::JfrThreadGroupEntry::thread_group() const {
   return _thread_group_weak_ref != NULL ? JNIHandles::resolve(_thread_group_weak_ref) : _thread_group_oop;
 }
 void JfrThreadGroup::JfrThreadGroupEntry::set_thread_group(JfrThreadGroupPointers& ptrs) {
   _thread_group_weak_ref = ptrs.transfer_weak_global_handle_ownership();
   if (_thread_group_weak_ref == NULL) {
     _thread_group_oop = ptrs.thread_group_oop();
     assert(_thread_group_oop != NULL, "invariant");
   } else {
     _thread_group_oop = NULL;
   }
 }
 JfrThreadGroup::JfrThreadGroup() : _list(NULL) {
   _list = new (ResourceObj::C_HEAP, mtTracing) GrowableArray<JfrThreadGroupEntry*>(30, true);
 }
 JfrThreadGroup::~JfrThreadGroup() {
   assert(SafepointSynchronize::is_at_safepoint(), "invariant");
   if (_list != NULL) {
     for (int i = 0; i < _list->length(); i++) {
       JfrThreadGroupEntry* e = _list->at(i);
       delete e;
     }
     delete _list;
   }
 }
 JfrThreadGroup* JfrThreadGroup::instance() {
   return _instance;
 }
 void JfrThreadGroup::set_instance(JfrThreadGroup* new_instance) {
   _instance = new_instance;
 }
 traceid JfrThreadGroup::thread_group_id(const JavaThread* jt, Thread* current) {
   ResourceMark rm(current);
   HandleMark hm(current);
   JfrThreadGroupsHelper helper(jt, current);
   return helper.is_valid() ? thread_group_id_internal(helper) : 0;
 }
 traceid JfrThreadGroup::thread_group_id(JavaThread* jt) {
   assert(!JfrStream_lock->owned_by_self(), "holding stream lock but should not hold it here");
   return thread_group_id(jt, jt);
 }
 traceid JfrThreadGroup::thread_group_id_internal(JfrThreadGroupsHelper& helper) {
   ThreadGroupExclusiveAccess lock;
   JfrThreadGroup* tg_instance = instance();
   if (tg_instance == NULL) {
     tg_instance = new JfrThreadGroup();
     if (tg_instance == NULL) {
       return 0;
     }
     set_instance(tg_instance);
   }
   JfrThreadGroupEntry* tge = NULL;
   int parent_thread_group_id = 0;
   while (helper.has_next()) {
     JfrThreadGroupPointers& ptrs = helper.next();
     tge = tg_instance->find_entry(ptrs);
     if (NULL == tge) {
       tge = tg_instance->new_entry(ptrs);
       assert(tge != NULL, "invariant");
       tge->set_parent_group_id(parent_thread_group_id);
     }
     parent_thread_group_id = tge->thread_group_id();
   }
   // the last entry in the hierarchy is the immediate thread group
   return tge->thread_group_id();
 }
 bool JfrThreadGroup::JfrThreadGroupEntry::is_equal(const JfrThreadGroupPointers& ptrs) const {
   return ptrs.thread_group_oop() == thread_group();
 }
 JfrThreadGroup::JfrThreadGroupEntry*
 JfrThreadGroup::find_entry(const JfrThreadGroupPointers& ptrs) const {
   for (int index = 0; index < _list->length(); ++index) {
     JfrThreadGroupEntry* curtge = _list->at(index);
     if (curtge->is_equal(ptrs)) {
       return curtge;
     }
   }
   return (JfrThreadGroupEntry*) NULL;
 }
 // Assumes you already searched for the existence
 // of a corresponding entry in find_entry().
 JfrThreadGroup::JfrThreadGroupEntry*
 JfrThreadGroup::new_entry(JfrThreadGroupPointers& ptrs) {
   typeArrayOop tg_name = java_lang_ThreadGroup::name(ptrs.thread_group_oop());
   JfrThreadGroupEntry* const tge =
     new JfrThreadGroupEntry(UNICODE::as_utf8((jchar*) tg_name->base(T_CHAR), tg_name->length()), ptrs);
   add_entry(tge);
   return tge;
 }
 int JfrThreadGroup::add_entry(JfrThreadGroupEntry* tge) {
   assert(tge != NULL, "attempting to add a null entry!");
   assert(0 == tge->thread_group_id(), "id must be unassigned!");
   tge->set_thread_group_id(next_id());
   return _list->append(tge);
 }
 void JfrThreadGroup::write_thread_group_entries(JfrCheckpointWriter& writer) const {
   assert(_list != NULL && !_list->is_empty(), "should not need be here!");
   const int number_of_tg_entries = _list->length();
   writer.write_count(number_of_tg_entries);
   for (int index = 0; index < number_of_tg_entries; ++index) {
     const JfrThreadGroupEntry* const curtge = _list->at(index);
     writer.write_key(curtge->thread_group_id());
     writer.write(curtge->parent_group_id());
     writer.write(curtge->thread_group_name());
   }
 }
 void JfrThreadGroup::write_selective_thread_group(JfrCheckpointWriter* writer, traceid thread_group_id) const {
   assert(writer != NULL, "invariant");
   assert(_list != NULL && !_list->is_empty(), "should not need be here!");
   const int number_of_tg_entries = _list->length();
   // save context
   const JfrCheckpointContext ctx = writer->context();
   writer->write_type(TYPE_THREADGROUP);
   const jlong count_offset = writer->reserve(sizeof(u4)); // Don't know how many yet
   int number_of_entries_written = 0;
   for (int index = number_of_tg_entries - 1; index >= 0; --index) {
     const JfrThreadGroupEntry* const curtge = _list->at(index);
     if (thread_group_id == curtge->thread_group_id()) {
       writer->write_key(curtge->thread_group_id());
       writer->write(curtge->parent_group_id());
       writer->write(curtge->thread_group_name());
       ++number_of_entries_written;
       thread_group_id = curtge->parent_group_id();
     }
   }
   if (number_of_entries_written == 0) {
     // nothing to write, restore context
     writer->set_context(ctx);
     return;
   }
   assert(number_of_entries_written > 0, "invariant");
   writer->write_count(number_of_entries_written, count_offset);
 }
 // Write out JfrThreadGroup instance and then delete it
 void JfrThreadGroup::serialize(JfrCheckpointWriter& writer) {
   ThreadGroupExclusiveAccess lock;
   JfrThreadGroup* tg_instance = instance();
   assert(tg_instance != NULL, "invariant");
   ResourceManager<JfrThreadGroup> tg_handle(tg_instance);
   set_instance(NULL);
   tg_handle->write_thread_group_entries(writer);
 }
 // for writing a particular thread group
 void JfrThreadGroup::serialize(JfrCheckpointWriter* writer, traceid thread_group_id) {
   assert(writer != NULL, "invariant");
   ThreadGroupExclusiveAccess lock;
   JfrThreadGroup* const tg_instance = instance();
   assert(tg_instance != NULL, "invariant");
   tg_instance->write_selective_thread_group(writer, thread_group_id);
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/jfr/recorder/checkpoint/types/jfrThreadGroup.cpp@a248d0be1309 (annotated)

src/share/vm/jfr/recorder/checkpoint/types/jfrThreadGroup.cpp