src/hotspot/share/runtime/safepoint.hpp
author chegar
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/*
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 * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#ifndef SHARE_RUNTIME_SAFEPOINT_HPP
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#define SHARE_RUNTIME_SAFEPOINT_HPP
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#include "memory/allocation.hpp"
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#include "runtime/os.hpp"
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#include "runtime/thread.hpp"
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#include "runtime/vmOperations.hpp"
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#include "utilities/ostream.hpp"
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#include "utilities/waitBarrier.hpp"
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//
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// Safepoint synchronization
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////
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// The VMThread uses the SafepointSynchronize::begin/end
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// methods to enter/exit a safepoint region. The begin method will roll
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// all JavaThreads forward to a safepoint.
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//
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// JavaThreads must use the ThreadSafepointState abstraction (defined in
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// thread.hpp) to indicate that that they are at a safepoint.
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//
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// The Mutex/Condition variable and ObjectLocker classes calls the enter/
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// exit safepoint methods, when a thread is blocked/restarted. Hence, all mutex exter/
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// exit points *must* be at a safepoint.
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class ThreadSafepointState;
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class SafepointStateTracker {
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  uint64_t _safepoint_id;
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  bool     _at_safepoint;
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public:
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  SafepointStateTracker(uint64_t safepoint_id, bool at_safepoint);
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  bool safepoint_state_changed();
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};
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//
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// Implements roll-forward to safepoint (safepoint synchronization)
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//
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class SafepointSynchronize : AllStatic {
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  enum SynchronizeState {
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      _not_synchronized = 0,                   // Threads not synchronized at a safepoint. Keep this value 0.
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      _synchronizing    = 1,                   // Synchronizing in progress
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      _synchronized     = 2                    // All Java threads are running in native, blocked in OS or stopped at safepoint.
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                                               // VM thread and any NonJavaThread may be running.
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  };
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  // The enums are listed in the order of the tasks when done serially.
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  enum SafepointCleanupTasks {
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    SAFEPOINT_CLEANUP_DEFLATE_MONITORS,
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    SAFEPOINT_CLEANUP_UPDATE_INLINE_CACHES,
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    SAFEPOINT_CLEANUP_COMPILATION_POLICY,
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    SAFEPOINT_CLEANUP_SYMBOL_TABLE_REHASH,
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    SAFEPOINT_CLEANUP_STRING_TABLE_REHASH,
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    SAFEPOINT_CLEANUP_CLD_PURGE,
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    SAFEPOINT_CLEANUP_SYSTEM_DICTIONARY_RESIZE,
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    SAFEPOINT_CLEANUP_REQUEST_OOPSTORAGE_CLEANUP,
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    // Leave this one last.
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    SAFEPOINT_CLEANUP_NUM_TASKS
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  };
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 private:
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  friend class SafepointMechanism;
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  friend class ThreadSafepointState;
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  friend class HandshakeState;
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  friend class SafepointStateTracker;
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  // Threads might read this flag directly, without acquiring the Threads_lock:
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  static volatile SynchronizeState _state;
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  // Number of threads we are waiting for to block:
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  static int              _waiting_to_block;
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  // Counts the number of active critical natives during the safepoint:
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  static int              _current_jni_active_count;
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  // This counter is used for fast versions of jni_Get<Primitive>Field.
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  // An even value means there are no ongoing safepoint operations.
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  // The counter is incremented ONLY at the beginning and end of each
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  // safepoint.
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  static volatile uint64_t _safepoint_counter;
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  // A change in this counter or a change in the result of
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  // is_at_safepoint() are used by SafepointStateTracker::
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  // safepoint_state_changed() to determine its answer.
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  static uint64_t _safepoint_id;
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  // JavaThreads that need to block for the safepoint will stop on the
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  // _wait_barrier, where they can quickly be started again.
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  static WaitBarrier* _wait_barrier;
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  static long         _end_of_last_safepoint;     // Time of last safepoint in milliseconds
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  static julong       _coalesced_vmop_count;     // coalesced vmop count
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  // For debug long safepoint
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  static void print_safepoint_timeout();
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  // Helper methods for safepoint procedure:
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  static void arm_safepoint();
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  static int synchronize_threads(jlong safepoint_limit_time, int nof_threads, int* initial_running);
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  static void disarm_safepoint();
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  static void increment_jni_active_count();
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  static void decrement_waiting_to_block();
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  static bool thread_not_running(ThreadSafepointState *cur_state);
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  // Used in safepoint_safe to do a stable load of the thread state.
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  static bool try_stable_load_state(JavaThreadState *state,
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                                    JavaThread *thread,
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                                    uint64_t safepoint_count);
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  // Called when a thread voluntarily blocks
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  static void block(JavaThread *thread);
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  // Called from VMThread during handshakes.
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  // If true the VMThread may safely process the handshake operation for the JavaThread.
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  static bool handshake_safe(JavaThread *thread);
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  static uint64_t safepoint_counter()             { return _safepoint_counter; }
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  static void init(Thread* vmthread);
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  // Roll all threads forward to safepoint. Must be called by the VMThread.
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  static void begin();
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  static void end();                    // Start all suspended threads again...
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  // The value for a not set safepoint id.
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  static const uint64_t InactiveSafepointCounter;
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  // Query
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  static bool is_at_safepoint()                   { return _state == _synchronized; }
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  static bool is_synchronizing()                  { return _state == _synchronizing; }
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  static uint64_t safepoint_id() {
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    return _safepoint_id;
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  }
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  static SafepointStateTracker safepoint_state_tracker() {
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    return SafepointStateTracker(safepoint_id(), is_at_safepoint());
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  }
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  // Exception handling for page polling
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  static void handle_polling_page_exception(JavaThread *thread);
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  static bool is_cleanup_needed();
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  static void do_cleanup_tasks();
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  static void set_is_at_safepoint()             { _state = _synchronized; }
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  static void set_is_not_at_safepoint()         { _state = _not_synchronized; }
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  // Assembly support
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  static address address_of_state()             { return (address)&_state; }
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  // Only used for making sure that no safepoint has happened in
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  // JNI_FastGetField. Therefore only the low 32-bits are needed
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  // even if this is a 64-bit counter.
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  static address safepoint_counter_addr() {
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#ifdef VM_LITTLE_ENDIAN
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    return (address)&_safepoint_counter;
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#else /* BIG */
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    // Return pointer to the 32 LSB:
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    return (address) (((uint32_t*)(&_safepoint_counter)) + 1);
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#endif
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  }
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};
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// Some helper assert macros for safepoint checks.
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#define assert_at_safepoint()                                           \
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  assert(SafepointSynchronize::is_at_safepoint(), "should be at a safepoint")
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#define assert_at_safepoint_msg(...)                                    \
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  assert(SafepointSynchronize::is_at_safepoint(), __VA_ARGS__)
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#define assert_not_at_safepoint()                                       \
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  assert(!SafepointSynchronize::is_at_safepoint(), "should not be at a safepoint")
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#define assert_not_at_safepoint_msg(...)                                \
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  assert(!SafepointSynchronize::is_at_safepoint(), __VA_ARGS__)
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// State class for a thread suspended at a safepoint
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class ThreadSafepointState: public CHeapObj<mtThread> {
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 private:
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  // At polling page safepoint (NOT a poll return safepoint):
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  volatile bool                   _at_poll_safepoint;
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  JavaThread*                     _thread;
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  bool                            _safepoint_safe;
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  volatile uint64_t               _safepoint_id;
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  ThreadSafepointState*           _next;
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  void account_safe_thread();
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 public:
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  ThreadSafepointState(JavaThread *thread);
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  // Linked list support:
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  ThreadSafepointState* get_next() const { return _next; }
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  void set_next(ThreadSafepointState* value) { _next = value; }
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  ThreadSafepointState** next_ptr() { return &_next; }
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  // examine/restart
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  void examine_state_of_thread(uint64_t safepoint_count);
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  void restart();
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  // Query
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  JavaThread*  thread() const         { return _thread; }
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  bool         is_running() const     { return !_safepoint_safe; }
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  uint64_t get_safepoint_id() const;
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  void     reset_safepoint_id();
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  void     set_safepoint_id(uint64_t sid);
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  // Support for safepoint timeout (debugging)
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  bool is_at_poll_safepoint()           { return _at_poll_safepoint; }
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  void set_at_poll_safepoint(bool val)  { _at_poll_safepoint = val; }
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  void handle_polling_page_exception();
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  // debugging
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  void print_on(outputStream* st) const;
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  // Initialize
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  static void create(JavaThread *thread);
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  static void destroy(JavaThread *thread);
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};
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class SafepointTracing : public AllStatic {
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private:
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  // Absolute
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  static jlong _last_safepoint_begin_time_ns;
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  static jlong _last_safepoint_sync_time_ns;
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  static jlong _last_safepoint_cleanup_time_ns;
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  static jlong _last_safepoint_end_time_ns;
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  // amount of ms since epoch
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  static jlong _last_safepoint_end_time_epoch_ms;
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  // Relative
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  static jlong _last_app_time_ns;
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  static int _nof_threads;
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  static int _nof_running;
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  static int _page_trap;
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  static VM_Operation::VMOp_Type _current_type;
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  static jlong     _max_sync_time;
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  static jlong     _max_vmop_time;
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  static uint64_t  _op_count[VM_Operation::VMOp_Terminating];
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  static void statistics_log();
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public:
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  static void init();
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  static void begin(VM_Operation::VMOp_Type type);
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  static void synchronized(int nof_threads, int nof_running, int traps);
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  static void cleanup();
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  static void end();
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  static void statistics_exit_log();
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  static jlong time_since_last_safepoint_ms() {
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    return (os::javaTimeNanos() - _last_safepoint_end_time_ns) / (NANOUNITS / MILLIUNITS);
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  }
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  static jlong end_of_last_safepoint_epoch_ms() {
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    return _last_safepoint_end_time_epoch_ms;
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  }
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  static jlong start_of_safepoint() {
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    return _last_safepoint_begin_time_ns;
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  }
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};
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#endif // SHARE_RUNTIME_SAFEPOINT_HPP