jdk8-mips64-public/hotspot: src/share/vm/services/threadService.hpp@eef07cd490d4 (annotated)

src/share/vm/services/threadService.hpp@eef07cd490d4 (annotated)

src/share/vm/services/threadService.hpp

Wed, 03 Jul 2019 20:42:37 +0800

author: aoqi
date: Wed, 03 Jul 2019 20:42:37 +0800
changeset 9637: eef07cd490d4
parent 8604: 04d83ba48607
permissions: -rw-r--r--

Merge

 /*
  * Copyright (c) 2003, 2013, 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_SERVICES_THREADSERVICE_HPP
 #define SHARE_VM_SERVICES_THREADSERVICE_HPP
 #include "classfile/javaClasses.hpp"
 #include "runtime/handles.hpp"
 #include "runtime/init.hpp"
 #include "runtime/jniHandles.hpp"
 #include "runtime/objectMonitor.hpp"
 #include "runtime/objectMonitor.inline.hpp"
 #include "runtime/perfData.hpp"
 #include "services/management.hpp"
 #include "services/serviceUtil.hpp"
 class OopClosure;
 class ThreadDumpResult;
 class ThreadStackTrace;
 class ThreadSnapshot;
 class StackFrameInfo;
 class ThreadConcurrentLocks;
 class DeadlockCycle;
 // VM monitoring and management support for the thread and
 // synchronization subsystem
 //
 // Thread contention monitoring is disabled by default.
 // When enabled, the VM will begin measuring the accumulated
 // elapsed time a thread blocked on synchronization.
 //
 class ThreadService : public AllStatic {
 private:
   // These counters could be moved to Threads class
   static PerfCounter*  _total_threads_count;
   static PerfVariable* _live_threads_count;
   static PerfVariable* _peak_threads_count;
   static PerfVariable* _daemon_threads_count;
   // These 2 counters are atomically incremented once the thread is exiting.
   // They will be atomically decremented when ThreadService::remove_thread is called.
   static volatile int  _exiting_threads_count;
   static volatile int  _exiting_daemon_threads_count;
   static bool          _thread_monitoring_contention_enabled;
   static bool          _thread_cpu_time_enabled;
   static bool          _thread_allocated_memory_enabled;
   // Need to keep the list of thread dump result that
   // keep references to Method* since thread dump can be
   // requested by multiple threads concurrently.
   static ThreadDumpResult* _threaddump_list;
 public:
   static void init();
   static void add_thread(JavaThread* thread, bool daemon);
   static void remove_thread(JavaThread* thread, bool daemon);
   static void current_thread_exiting(JavaThread* jt);
   static bool set_thread_monitoring_contention(bool flag);
   static bool is_thread_monitoring_contention() { return _thread_monitoring_contention_enabled; }
   static bool set_thread_cpu_time_enabled(bool flag);
   static bool is_thread_cpu_time_enabled()    { return _thread_cpu_time_enabled; }
   static bool set_thread_allocated_memory_enabled(bool flag);
   static bool is_thread_allocated_memory_enabled() { return _thread_cpu_time_enabled; }
   static jlong get_total_thread_count()       { return _total_threads_count->get_value(); }
   static jlong get_peak_thread_count()        { return _peak_threads_count->get_value(); }
   static jlong get_live_thread_count()        { return _live_threads_count->get_value() - _exiting_threads_count; }
   static jlong get_daemon_thread_count()      { return _daemon_threads_count->get_value() - _exiting_daemon_threads_count; }
   static int   exiting_threads_count()        { return _exiting_threads_count; }
   static int   exiting_daemon_threads_count() { return _exiting_daemon_threads_count; }
   // Support for thread dump
   static void   add_thread_dump(ThreadDumpResult* dump);
   static void   remove_thread_dump(ThreadDumpResult* dump);
   static Handle get_current_contended_monitor(JavaThread* thread);
   // This function is called by JVM_DumpThreads.
   static Handle dump_stack_traces(GrowableArray<instanceHandle>* threads,
                                   int num_threads, TRAPS);
   static void   reset_peak_thread_count();
   static void   reset_contention_count_stat(JavaThread* thread);
   static void   reset_contention_time_stat(JavaThread* thread);
   static DeadlockCycle*       find_deadlocks_at_safepoint(bool object_monitors_only);
   // GC support
   static void   oops_do(OopClosure* f);
   static void   metadata_do(void f(Metadata*));
 };
 // Per-thread Statistics for synchronization
 class ThreadStatistics : public CHeapObj<mtInternal> {
 private:
   // The following contention statistics are only updated by
   // the thread owning these statistics when contention occurs.
   jlong        _contended_enter_count;
   elapsedTimer _contended_enter_timer;
   jlong        _monitor_wait_count;
   elapsedTimer _monitor_wait_timer;
   jlong        _sleep_count;
   elapsedTimer _sleep_timer;
   // These two reset flags are set to true when another thread
   // requests to reset the statistics.  The actual statistics
   // are reset when the thread contention occurs and attempts
   // to update the statistics.
   bool         _count_pending_reset;
   bool         _timer_pending_reset;
   // Keep accurate times for potentially recursive class operations
   int           _perf_recursion_counts[6];
   elapsedTimer  _perf_timers[6];
   // utility functions
   void  check_and_reset_count()            {
                                              if (!_count_pending_reset) return;
                                              _contended_enter_count = 0;
                                              _monitor_wait_count = 0;
                                              _sleep_count = 0;
                                              _count_pending_reset = 0;
                                            }
   void  check_and_reset_timer()            {
                                              if (!_timer_pending_reset) return;
                                              _contended_enter_timer.reset();
                                              _monitor_wait_timer.reset();
                                              _sleep_timer.reset();
                                              _timer_pending_reset = 0;
                                            }
 public:
   ThreadStatistics();
   jlong contended_enter_count()            { return (_count_pending_reset ? 0 : _contended_enter_count); }
   jlong contended_enter_ticks()            { return (_timer_pending_reset ? 0 : _contended_enter_timer.active_ticks()); }
   jlong monitor_wait_count()               { return (_count_pending_reset ? 0 : _monitor_wait_count); }
   jlong monitor_wait_ticks()               { return (_timer_pending_reset ? 0 : _monitor_wait_timer.active_ticks()); }
   jlong sleep_count()                      { return (_count_pending_reset ? 0 : _sleep_count); }
   jlong sleep_ticks()                      { return (_timer_pending_reset ? 0 : _sleep_timer.active_ticks()); }
   void monitor_wait()                      { check_and_reset_count(); _monitor_wait_count++; }
   void monitor_wait_begin()                { check_and_reset_timer(); _monitor_wait_timer.start(); }
   void monitor_wait_end()                  { _monitor_wait_timer.stop(); check_and_reset_timer(); }
   void thread_sleep()                      { check_and_reset_count(); _sleep_count++; }
   void thread_sleep_begin()                { check_and_reset_timer(); _sleep_timer.start(); }
   void thread_sleep_end()                  { _sleep_timer.stop(); check_and_reset_timer(); }
   void contended_enter()                   { check_and_reset_count(); _contended_enter_count++; }
   void contended_enter_begin()             { check_and_reset_timer(); _contended_enter_timer.start(); }
   void contended_enter_end()               { _contended_enter_timer.stop(); check_and_reset_timer(); }
   void reset_count_stat()                  { _count_pending_reset = true; }
   void reset_time_stat()                   { _timer_pending_reset = true; }
   int* perf_recursion_counts_addr()        { return _perf_recursion_counts; }
   elapsedTimer* perf_timers_addr()         { return _perf_timers; }
 };
 // Thread snapshot to represent the thread state and statistics
 class ThreadSnapshot : public CHeapObj<mtInternal> {
 private:
   JavaThread* _thread;
   oop         _threadObj;
   java_lang_Thread::ThreadStatus _thread_status;
   bool    _is_ext_suspended;
   bool    _is_in_native;
   jlong   _contended_enter_ticks;
   jlong   _contended_enter_count;
   jlong   _monitor_wait_ticks;
   jlong   _monitor_wait_count;
   jlong   _sleep_ticks;
   jlong   _sleep_count;
   oop     _blocker_object;
   oop     _blocker_object_owner;
   ThreadStackTrace*      _stack_trace;
   ThreadConcurrentLocks* _concurrent_locks;
   ThreadSnapshot*        _next;
 public:
   // Dummy snapshot
   ThreadSnapshot() : _thread(NULL), _threadObj(NULL), _stack_trace(NULL), _concurrent_locks(NULL), _next(NULL),
                      _blocker_object(NULL), _blocker_object_owner(NULL) {};
   ThreadSnapshot(JavaThread* thread);
   ~ThreadSnapshot();
   java_lang_Thread::ThreadStatus thread_status() { return _thread_status; }
   oop         threadObj() const           { return _threadObj; }
   void        set_next(ThreadSnapshot* n) { _next = n; }
   bool        is_ext_suspended()          { return _is_ext_suspended; }
   bool        is_in_native()              { return _is_in_native; }
   jlong       contended_enter_count()     { return _contended_enter_count; }
   jlong       contended_enter_ticks()     { return _contended_enter_ticks; }
   jlong       monitor_wait_count()        { return _monitor_wait_count; }
   jlong       monitor_wait_ticks()        { return _monitor_wait_ticks; }
   jlong       sleep_count()               { return _sleep_count; }
   jlong       sleep_ticks()               { return _sleep_ticks; }
   oop         blocker_object()            { return _blocker_object; }
   oop         blocker_object_owner()      { return _blocker_object_owner; }
   ThreadSnapshot*   next() const          { return _next; }
   ThreadStackTrace* get_stack_trace()     { return _stack_trace; }
   ThreadConcurrentLocks* get_concurrent_locks()     { return _concurrent_locks; }
   void        dump_stack_at_safepoint(int max_depth, bool with_locked_monitors);
   void        set_concurrent_locks(ThreadConcurrentLocks* l) { _concurrent_locks = l; }
   void        oops_do(OopClosure* f);
   void        metadata_do(void f(Metadata*));
 };
 class ThreadStackTrace : public CHeapObj<mtInternal> {
  private:
   JavaThread*                     _thread;
   int                             _depth;  // number of stack frames added
   bool                            _with_locked_monitors;
   GrowableArray<StackFrameInfo*>* _frames;
   GrowableArray<oop>*             _jni_locked_monitors;
  public:
   ThreadStackTrace(JavaThread* thread, bool with_locked_monitors);
   ~ThreadStackTrace();
   JavaThread*     thread()              { return _thread; }
   StackFrameInfo* stack_frame_at(int i) { return _frames->at(i); }
   int             get_stack_depth()     { return _depth; }
   void            add_stack_frame(javaVFrame* jvf);
   void            dump_stack_at_safepoint(int max_depth);
   Handle          allocate_fill_stack_trace_element_array(TRAPS);
   void            oops_do(OopClosure* f);
   void            metadata_do(void f(Metadata*));
   GrowableArray<oop>* jni_locked_monitors() { return _jni_locked_monitors; }
   int             num_jni_locked_monitors() { return (_jni_locked_monitors != NULL ? _jni_locked_monitors->length() : 0); }
   bool            is_owned_monitor_on_stack(oop object);
   void            add_jni_locked_monitor(oop object) { _jni_locked_monitors->append(object); }
 };
 // StackFrameInfo for keeping Method* and bci during
 // stack walking for later construction of StackTraceElement[]
 // Java instances
 class StackFrameInfo : public CHeapObj<mtInternal> {
  private:
   Method*             _method;
   int                 _bci;
   GrowableArray<oop>* _locked_monitors; // list of object monitors locked by this frame
   // We need to save the mirrors in the backtrace to keep the class
   // from being unloaded while we still have this stack trace.
   oop                 _class_holder;
  public:
   StackFrameInfo(javaVFrame* jvf, bool with_locked_monitors);
   ~StackFrameInfo() {
     if (_locked_monitors != NULL) {
       delete _locked_monitors;
     }
   };
   Method*   method() const       { return _method; }
   int       bci()    const       { return _bci; }
   void      oops_do(OopClosure* f);
   void      metadata_do(void f(Metadata*));
   int       num_locked_monitors()       { return (_locked_monitors != NULL ? _locked_monitors->length() : 0); }
   GrowableArray<oop>* locked_monitors() { return _locked_monitors; }
   void      print_on(outputStream* st) const;
 };
 class ThreadConcurrentLocks : public CHeapObj<mtInternal> {
 private:
   GrowableArray<instanceOop>* _owned_locks;
   ThreadConcurrentLocks*      _next;
   JavaThread*                 _thread;
  public:
   ThreadConcurrentLocks(JavaThread* thread);
   ~ThreadConcurrentLocks();
   void                        add_lock(instanceOop o);
   void                        set_next(ThreadConcurrentLocks* n) { _next = n; }
   ThreadConcurrentLocks*      next() { return _next; }
   JavaThread*                 java_thread()                      { return _thread; }
   GrowableArray<instanceOop>* owned_locks()                      { return _owned_locks; }
   void                        oops_do(OopClosure* f);
 };
 class ConcurrentLocksDump : public StackObj {
  private:
   ThreadConcurrentLocks* _map;
   ThreadConcurrentLocks* _last;   // Last ThreadConcurrentLocks in the map
   bool                   _retain_map_on_free;
   void build_map(GrowableArray<oop>* aos_objects);
   void add_lock(JavaThread* thread, instanceOop o);
  public:
   ConcurrentLocksDump(bool retain_map_on_free) : _map(NULL), _last(NULL), _retain_map_on_free(retain_map_on_free) {};
   ConcurrentLocksDump() : _map(NULL), _last(NULL), _retain_map_on_free(false) {};
   ~ConcurrentLocksDump();
   void                        dump_at_safepoint();
   ThreadConcurrentLocks*      thread_concurrent_locks(JavaThread* thread);
   void                        print_locks_on(JavaThread* t, outputStream* st);
 };
 class ThreadDumpResult : public StackObj {
  private:
   int                  _num_threads;
   int                  _num_snapshots;
   ThreadSnapshot*      _snapshots;
   ThreadSnapshot*      _last;
   ThreadDumpResult*    _next;
  public:
   ThreadDumpResult();
   ThreadDumpResult(int num_threads);
   ~ThreadDumpResult();
   void                 add_thread_snapshot(ThreadSnapshot* ts);
   void                 set_next(ThreadDumpResult* next) { _next = next; }
   ThreadDumpResult*    next()                           { return _next; }
   int                  num_threads()                    { return _num_threads; }
   int                  num_snapshots()                  { return _num_snapshots; }
   ThreadSnapshot*      snapshots()                      { return _snapshots; }
   void                 oops_do(OopClosure* f);
   void                 metadata_do(void f(Metadata*));
 };
 class DeadlockCycle : public CHeapObj<mtInternal> {
  private:
   bool _is_deadlock;
   GrowableArray<JavaThread*>* _threads;
   DeadlockCycle*              _next;
  public:
   DeadlockCycle();
   ~DeadlockCycle();
   DeadlockCycle* next()                     { return _next; }
   void           set_next(DeadlockCycle* d) { _next = d; }
   void           add_thread(JavaThread* t)  { _threads->append(t); }
   void           reset()                    { _is_deadlock = false; _threads->clear(); }
   void           set_deadlock(bool value)   { _is_deadlock = value; }
   bool           is_deadlock()              { return _is_deadlock; }
   int            num_threads()              { return _threads->length(); }
   GrowableArray<JavaThread*>* threads()     { return _threads; }
   void           print_on(outputStream* st) const;
 };
 // Utility class to get list of java threads.
 class ThreadsListEnumerator : public StackObj {
 private:
   GrowableArray<instanceHandle>* _threads_array;
 public:
   ThreadsListEnumerator(Thread* cur_thread,
                         bool include_jvmti_agent_threads = false,
                         bool include_jni_attaching_threads = true);
   int            num_threads()            { return _threads_array->length(); }
   instanceHandle get_threadObj(int index) { return _threads_array->at(index); }
 };
 // abstract utility class to set new thread states, and restore previous after the block exits
 class JavaThreadStatusChanger : public StackObj {
  private:
   java_lang_Thread::ThreadStatus _old_state;
   JavaThread*  _java_thread;
   bool _is_alive;
   void save_old_state(JavaThread* java_thread) {
     _java_thread  = java_thread;
     _is_alive = is_alive(java_thread);
     if (is_alive()) {
       _old_state = java_lang_Thread::get_thread_status(_java_thread->threadObj());
     }
   }
  public:
   static void set_thread_status(JavaThread* java_thread,
                                 java_lang_Thread::ThreadStatus state) {
     java_lang_Thread::set_thread_status(java_thread->threadObj(), state);
   }
   void set_thread_status(java_lang_Thread::ThreadStatus state) {
     if (is_alive()) {
       set_thread_status(_java_thread, state);
     }
   }
   JavaThreadStatusChanger(JavaThread* java_thread,
                           java_lang_Thread::ThreadStatus state) : _old_state(java_lang_Thread::NEW) {
     save_old_state(java_thread);
     set_thread_status(state);
   }
   JavaThreadStatusChanger(JavaThread* java_thread) : _old_state(java_lang_Thread::NEW) {
     save_old_state(java_thread);
   }
   ~JavaThreadStatusChanger() {
     set_thread_status(_old_state);
   }
   static bool is_alive(JavaThread* java_thread) {
     return java_thread != NULL && java_thread->threadObj() != NULL;
   }
   bool is_alive() {
     return _is_alive;
   }
 };
 // Change status to waiting on an object  (timed or indefinite)
 class JavaThreadInObjectWaitState : public JavaThreadStatusChanger {
  private:
   ThreadStatistics* _stat;
   bool _active;
  public:
   JavaThreadInObjectWaitState(JavaThread *java_thread, bool timed) :
     JavaThreadStatusChanger(java_thread,
                             timed ? java_lang_Thread::IN_OBJECT_WAIT_TIMED : java_lang_Thread::IN_OBJECT_WAIT) {
     if (is_alive()) {
       _stat = java_thread->get_thread_stat();
       _active = ThreadService::is_thread_monitoring_contention();
       _stat->monitor_wait();
       if (_active) {
         _stat->monitor_wait_begin();
       }
     } else {
       _active = false;
     }
   }
   ~JavaThreadInObjectWaitState() {
     if (_active) {
       _stat->monitor_wait_end();
     }
   }
 };
 // Change status to parked (timed or indefinite)
 class JavaThreadParkedState : public JavaThreadStatusChanger {
  private:
   ThreadStatistics* _stat;
   bool _active;
  public:
   JavaThreadParkedState(JavaThread *java_thread, bool timed) :
     JavaThreadStatusChanger(java_thread,
                             timed ? java_lang_Thread::PARKED_TIMED : java_lang_Thread::PARKED) {
     if (is_alive()) {
       _stat = java_thread->get_thread_stat();
       _active = ThreadService::is_thread_monitoring_contention();
       _stat->monitor_wait();
       if (_active) {
         _stat->monitor_wait_begin();
       }
     } else {
       _active = false;
     }
   }
   ~JavaThreadParkedState() {
     if (_active) {
       _stat->monitor_wait_end();
     }
   }
 };
 // Change status to blocked on (re-)entering a synchronization block
 class JavaThreadBlockedOnMonitorEnterState : public JavaThreadStatusChanger {
  private:
   ThreadStatistics* _stat;
   bool _active;
   static bool contended_enter_begin(JavaThread *java_thread) {
     set_thread_status(java_thread, java_lang_Thread::BLOCKED_ON_MONITOR_ENTER);
     ThreadStatistics* stat = java_thread->get_thread_stat();
     stat->contended_enter();
     bool active = ThreadService::is_thread_monitoring_contention();
     if (active) {
       stat->contended_enter_begin();
     }
     return active;
   }
  public:
   // java_thread is waiting thread being blocked on monitor reenter.
   // Current thread is the notifying thread which holds the monitor.
   static bool wait_reenter_begin(JavaThread *java_thread, ObjectMonitor *obj_m) {
     assert((java_thread != NULL), "Java thread should not be null here");
     bool active = false;
     if (is_alive(java_thread) && ServiceUtil::visible_oop((oop)obj_m->object())) {
       active = contended_enter_begin(java_thread);
     }
     return active;
   }
   static void wait_reenter_end(JavaThread *java_thread, bool active) {
     if (active) {
       java_thread->get_thread_stat()->contended_enter_end();
     }
     set_thread_status(java_thread, java_lang_Thread::RUNNABLE);
   }
   JavaThreadBlockedOnMonitorEnterState(JavaThread *java_thread, ObjectMonitor *obj_m) :
     _stat(NULL), _active(false), JavaThreadStatusChanger(java_thread) {
     assert((java_thread != NULL), "Java thread should not be null here");
     // Change thread status and collect contended enter stats for monitor contended
     // enter done for external java world objects and it is contended. All other cases
     // like for vm internal objects and for external objects which are not contended
     // thread status is not changed and contended enter stat is not collected.
     _active = false;
     if (is_alive() && ServiceUtil::visible_oop((oop)obj_m->object()) && obj_m->contentions() > 0) {
       _stat = java_thread->get_thread_stat();
       _active = contended_enter_begin(java_thread);
     }
   }
   ~JavaThreadBlockedOnMonitorEnterState() {
     if (_active) {
       _stat->contended_enter_end();
     }
   }
 };
 // Change status to sleeping
 class JavaThreadSleepState : public JavaThreadStatusChanger {
  private:
   ThreadStatistics* _stat;
   bool _active;
  public:
   JavaThreadSleepState(JavaThread *java_thread) :
     JavaThreadStatusChanger(java_thread, java_lang_Thread::SLEEPING) {
     if (is_alive()) {
       _stat = java_thread->get_thread_stat();
       _active = ThreadService::is_thread_monitoring_contention();
       _stat->thread_sleep();
       if (_active) {
         _stat->thread_sleep_begin();
       }
     } else {
       _active = false;
     }
   }
   ~JavaThreadSleepState() {
     if (_active) {
       _stat->thread_sleep_end();
     }
   }
 };
 #endif // SHARE_VM_SERVICES_THREADSERVICE_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/services/threadService.hpp@eef07cd490d4 (annotated)

src/share/vm/services/threadService.hpp