src/hotspot/share/runtime/safepoint.hpp
author erikj
Tue, 12 Sep 2017 19:03:39 +0200
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parent 46702 hotspot/src/share/vm/runtime/safepoint.hpp@13ae789b982e
child 47774 69c081ca110a
permissions -rw-r--r--
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/*
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 * Copyright (c) 1997, 2017, 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_VM_RUNTIME_SAFEPOINT_HPP
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#define SHARE_VM_RUNTIME_SAFEPOINT_HPP
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#include "asm/assembler.hpp"
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#include "code/nmethod.hpp"
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#include "memory/allocation.hpp"
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#include "runtime/extendedPC.hpp"
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#include "runtime/mutexLocker.hpp"
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#include "runtime/os.hpp"
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#include "utilities/ostream.hpp"
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//
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// Safepoint synchronization
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////
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// The VMThread or CMS_thread 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 SnippetCache;
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class nmethod;
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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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 public:
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  enum SynchronizeState {
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      _not_synchronized = 0,                   // Threads not synchronized at a safepoint
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                                               // Keep this value 0. See the comment in do_call_back()
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      _synchronizing    = 1,                   // Synchronizing in progress
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      _synchronized     = 2                    // All Java threads are stopped at a safepoint. Only VM thread is running
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  };
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  enum SafepointingThread {
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      _null_thread  = 0,
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      _vm_thread    = 1,
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      _other_thread = 2
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  };
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  enum SafepointTimeoutReason {
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    _spinning_timeout = 0,
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    _blocking_timeout = 1
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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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    // Leave this one last.
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    SAFEPOINT_CLEANUP_NUM_TASKS
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  };
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  typedef struct {
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    float  _time_stamp;                        // record when the current safepoint occurs in seconds
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    int    _vmop_type;                         // type of VM operation triggers the safepoint
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    int    _nof_total_threads;                 // total number of Java threads
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    int    _nof_initial_running_threads;       // total number of initially seen running threads
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    int    _nof_threads_wait_to_block;         // total number of threads waiting for to block
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    bool   _page_armed;                        // true if polling page is armed, false otherwise
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    int    _nof_threads_hit_page_trap;         // total number of threads hitting the page trap
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    jlong  _time_to_spin;                      // total time in millis spent in spinning
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    jlong  _time_to_wait_to_block;             // total time in millis spent in waiting for to block
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    jlong  _time_to_do_cleanups;               // total time in millis spent in performing cleanups
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    jlong  _time_to_sync;                      // total time in millis spent in getting to _synchronized
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    jlong  _time_to_exec_vmop;                 // total time in millis spent in vm operation itself
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  } SafepointStats;
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 private:
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  static volatile SynchronizeState _state;     // Threads might read this flag directly, without acquiring the Threads_lock
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  static volatile int _waiting_to_block;       // number of threads we are waiting for to block
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  static int _current_jni_active_count;        // Counts the number of active critical natives during the safepoint
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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 is 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. The fact that Threads_lock is held throughout each pair of
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  // increments (at the beginning and end of each safepoint) guarantees
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  // race freedom.
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  static volatile int _safepoint_counter;
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  static long       _end_of_last_safepoint;     // Time of last safepoint in milliseconds
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  // Statistics
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  static jlong            _safepoint_begin_time;     // time when safepoint begins
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  static SafepointStats*  _safepoint_stats;          // array of SafepointStats struct
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  static int              _cur_stat_index;           // current index to the above array
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  static julong           _safepoint_reasons[];      // safepoint count for each VM op
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  static julong           _coalesced_vmop_count;     // coalesced vmop count
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  static jlong            _max_sync_time;            // maximum sync time in nanos
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  static jlong            _max_vmop_time;            // maximum vm operation time in nanos
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  static float            _ts_of_current_safepoint;  // time stamp of current safepoint in seconds
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  static void begin_statistics(int nof_threads, int nof_running);
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  static void update_statistics_on_spin_end();
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  static void update_statistics_on_sync_end(jlong end_time);
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  static void update_statistics_on_cleanup_end(jlong end_time);
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  static void end_statistics(jlong end_time);
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  static void print_statistics();
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  inline static void inc_page_trap_count() {
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    Atomic::inc(&_safepoint_stats[_cur_stat_index]._nof_threads_hit_page_trap);
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  }
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  // For debug long safepoint
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  static void print_safepoint_timeout(SafepointTimeoutReason timeout_reason);
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  // Main entry points
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  // Roll all threads forward to safepoint. Must be called by the
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  // VMThread or CMS_thread.
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  static void begin();
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  static void end();                    // Start all suspended threads again...
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  static bool safepoint_safe(JavaThread *thread, JavaThreadState state);
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  static void check_for_lazy_critical_native(JavaThread *thread, JavaThreadState state);
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  // Query
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  inline static bool is_at_safepoint()   { return _state == _synchronized;  }
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  inline static bool is_synchronizing()  { return _state == _synchronizing;  }
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  inline static int safepoint_counter()  { return _safepoint_counter; }
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  inline static bool do_call_back() {
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    return (_state != _not_synchronized);
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  }
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  inline static void increment_jni_active_count() {
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    assert_locked_or_safepoint(Safepoint_lock);
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    _current_jni_active_count++;
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  }
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  // Called when a thread voluntarily blocks
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  static void   block(JavaThread *thread);
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  static void   signal_thread_at_safepoint()              { _waiting_to_block--; }
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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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  // VM Thread interface for determining safepoint rate
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  static long last_non_safepoint_interval() {
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    return os::javaTimeMillis() - _end_of_last_safepoint;
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  }
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  static long end_of_last_safepoint() {
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    return _end_of_last_safepoint;
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  }
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  static bool is_cleanup_needed();
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  static void do_cleanup_tasks();
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  // Debugging
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  static void print_state()                                PRODUCT_RETURN;
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  static void safepoint_msg(const char* format, ...) ATTRIBUTE_PRINTF(1, 2) PRODUCT_RETURN;
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  static void deferred_initialize_stat();
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  static void print_stat_on_exit();
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  inline static void inc_vmop_coalesced_count() { _coalesced_vmop_count++; }
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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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  static address safepoint_counter_addr()                  { return (address)&_safepoint_counter; }
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};
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// State class for a thread suspended at a safepoint
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class ThreadSafepointState: public CHeapObj<mtInternal> {
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 public:
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  // These states are maintained by VM thread while threads are being brought
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  // to a safepoint.  After SafepointSynchronize::end(), they are reset to
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  // _running.
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  enum suspend_type {
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    _running                =  0, // Thread state not yet determined (i.e., not at a safepoint yet)
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    _at_safepoint           =  1, // Thread at a safepoint (f.ex., when blocked on a lock)
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    _call_back              =  2  // Keep executing and wait for callback (if thread is in interpreted or vm)
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  };
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 private:
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  volatile bool _at_poll_safepoint;  // At polling page safepoint (NOT a poll return safepoint)
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  // Thread has called back the safepoint code (for debugging)
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  bool                           _has_called_back;
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  JavaThread *                   _thread;
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  volatile suspend_type          _type;
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  JavaThreadState                _orig_thread_state;
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 public:
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  ThreadSafepointState(JavaThread *thread);
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  // examine/roll-forward/restart
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  void examine_state_of_thread();
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  void roll_forward(suspend_type type);
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  void restart();
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  // Query
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  JavaThread*  thread() const         { return _thread; }
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  suspend_type type() const           { return _type; }
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  bool         is_running() const     { return (_type==_running); }
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  JavaThreadState orig_thread_state() const { return _orig_thread_state; }
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  // Support for safepoint timeout (debugging)
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  bool has_called_back() const                   { return _has_called_back; }
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  void set_has_called_back(bool val)             { _has_called_back = val; }
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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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  void print() const                        { print_on(tty); }
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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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  void safepoint_msg(const char* format, ...) ATTRIBUTE_PRINTF(2, 3) {
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    if (ShowSafepointMsgs) {
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      va_list ap;
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      va_start(ap, format);
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      tty->vprint_cr(format, ap);
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      va_end(ap);
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    }
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  }
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};
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#endif // SHARE_VM_RUNTIME_SAFEPOINT_HPP