612 lines
23 KiB
C++
612 lines
23 KiB
C++
/*
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* Copyright (c) 2003, 2018, 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_SERVICES_THREADSERVICE_HPP
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#define SHARE_VM_SERVICES_THREADSERVICE_HPP
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#include "classfile/javaClasses.hpp"
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#include "runtime/handles.hpp"
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#include "runtime/init.hpp"
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#include "runtime/jniHandles.hpp"
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#include "runtime/objectMonitor.hpp"
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#include "runtime/perfData.hpp"
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#include "runtime/thread.hpp"
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#include "runtime/threadSMR.hpp"
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#include "services/management.hpp"
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class OopClosure;
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class ThreadDumpResult;
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class ThreadStackTrace;
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class ThreadSnapshot;
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class StackFrameInfo;
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class ThreadConcurrentLocks;
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class DeadlockCycle;
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// VM monitoring and management support for the thread and
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// synchronization subsystem
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//
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// Thread contention monitoring is disabled by default.
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// When enabled, the VM will begin measuring the accumulated
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// elapsed time a thread blocked on synchronization.
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//
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class ThreadService : public AllStatic {
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private:
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// These counters could be moved to Threads class
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static PerfCounter* _total_threads_count;
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static PerfVariable* _live_threads_count;
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static PerfVariable* _peak_threads_count;
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static PerfVariable* _daemon_threads_count;
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// These 2 counters are atomically incremented once the thread is exiting.
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// They will be atomically decremented when ThreadService::remove_thread is called.
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static volatile int _exiting_threads_count;
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static volatile int _exiting_daemon_threads_count;
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static bool _thread_monitoring_contention_enabled;
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static bool _thread_cpu_time_enabled;
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static bool _thread_allocated_memory_enabled;
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// Need to keep the list of thread dump result that
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// keep references to Method* since thread dump can be
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// requested by multiple threads concurrently.
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static ThreadDumpResult* _threaddump_list;
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public:
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static void init();
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static void add_thread(JavaThread* thread, bool daemon);
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static void remove_thread(JavaThread* thread, bool daemon);
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static void current_thread_exiting(JavaThread* jt);
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static bool set_thread_monitoring_contention(bool flag);
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static bool is_thread_monitoring_contention() { return _thread_monitoring_contention_enabled; }
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static bool set_thread_cpu_time_enabled(bool flag);
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static bool is_thread_cpu_time_enabled() { return _thread_cpu_time_enabled; }
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static bool set_thread_allocated_memory_enabled(bool flag);
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static bool is_thread_allocated_memory_enabled() { return _thread_cpu_time_enabled; }
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static jlong get_total_thread_count() { return _total_threads_count->get_value(); }
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static jlong get_peak_thread_count() { return _peak_threads_count->get_value(); }
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static jlong get_live_thread_count() { return _live_threads_count->get_value() - _exiting_threads_count; }
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static jlong get_daemon_thread_count() { return _daemon_threads_count->get_value() - _exiting_daemon_threads_count; }
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static int exiting_threads_count() { return _exiting_threads_count; }
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static int exiting_daemon_threads_count() { return _exiting_daemon_threads_count; }
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// Support for thread dump
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static void add_thread_dump(ThreadDumpResult* dump);
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static void remove_thread_dump(ThreadDumpResult* dump);
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static Handle get_current_contended_monitor(JavaThread* thread);
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// This function is called by JVM_DumpThreads.
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static Handle dump_stack_traces(GrowableArray<instanceHandle>* threads,
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int num_threads, TRAPS);
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static void reset_peak_thread_count();
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static void reset_contention_count_stat(JavaThread* thread);
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static void reset_contention_time_stat(JavaThread* thread);
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static DeadlockCycle* find_deadlocks_at_safepoint(ThreadsList * t_list, bool object_monitors_only);
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// GC support
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static void oops_do(OopClosure* f);
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static void metadata_do(void f(Metadata*));
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};
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// Per-thread Statistics for synchronization
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class ThreadStatistics : public CHeapObj<mtInternal> {
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private:
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// The following contention statistics are only updated by
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// the thread owning these statistics when contention occurs.
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jlong _contended_enter_count;
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elapsedTimer _contended_enter_timer;
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jlong _monitor_wait_count;
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elapsedTimer _monitor_wait_timer;
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jlong _sleep_count;
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elapsedTimer _sleep_timer;
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// These two reset flags are set to true when another thread
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// requests to reset the statistics. The actual statistics
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// are reset when the thread contention occurs and attempts
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// to update the statistics.
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bool _count_pending_reset;
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bool _timer_pending_reset;
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// Keep accurate times for potentially recursive class operations
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int _perf_recursion_counts[6];
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elapsedTimer _perf_timers[6];
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// utility functions
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void check_and_reset_count() {
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if (!_count_pending_reset) return;
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_contended_enter_count = 0;
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_monitor_wait_count = 0;
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_sleep_count = 0;
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_count_pending_reset = 0;
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}
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void check_and_reset_timer() {
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if (!_timer_pending_reset) return;
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_contended_enter_timer.reset();
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_monitor_wait_timer.reset();
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_sleep_timer.reset();
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_timer_pending_reset = 0;
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}
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public:
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ThreadStatistics();
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jlong contended_enter_count() { return (_count_pending_reset ? 0 : _contended_enter_count); }
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jlong contended_enter_ticks() { return (_timer_pending_reset ? 0 : _contended_enter_timer.active_ticks()); }
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jlong monitor_wait_count() { return (_count_pending_reset ? 0 : _monitor_wait_count); }
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jlong monitor_wait_ticks() { return (_timer_pending_reset ? 0 : _monitor_wait_timer.active_ticks()); }
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jlong sleep_count() { return (_count_pending_reset ? 0 : _sleep_count); }
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jlong sleep_ticks() { return (_timer_pending_reset ? 0 : _sleep_timer.active_ticks()); }
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void monitor_wait() { check_and_reset_count(); _monitor_wait_count++; }
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void monitor_wait_begin() { check_and_reset_timer(); _monitor_wait_timer.start(); }
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void monitor_wait_end() { _monitor_wait_timer.stop(); check_and_reset_timer(); }
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void thread_sleep() { check_and_reset_count(); _sleep_count++; }
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void thread_sleep_begin() { check_and_reset_timer(); _sleep_timer.start(); }
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void thread_sleep_end() { _sleep_timer.stop(); check_and_reset_timer(); }
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void contended_enter() { check_and_reset_count(); _contended_enter_count++; }
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void contended_enter_begin() { check_and_reset_timer(); _contended_enter_timer.start(); }
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void contended_enter_end() { _contended_enter_timer.stop(); check_and_reset_timer(); }
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void reset_count_stat() { _count_pending_reset = true; }
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void reset_time_stat() { _timer_pending_reset = true; }
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int* perf_recursion_counts_addr() { return _perf_recursion_counts; }
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elapsedTimer* perf_timers_addr() { return _perf_timers; }
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};
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// Thread snapshot to represent the thread state and statistics
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class ThreadSnapshot : public CHeapObj<mtInternal> {
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private:
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// This JavaThread* is protected by being stored in objects that are
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// protected by a ThreadsListSetter (ThreadDumpResult).
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JavaThread* _thread;
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oop _threadObj;
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java_lang_Thread::ThreadStatus _thread_status;
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bool _is_ext_suspended;
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bool _is_in_native;
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jlong _contended_enter_ticks;
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jlong _contended_enter_count;
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jlong _monitor_wait_ticks;
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jlong _monitor_wait_count;
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jlong _sleep_ticks;
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jlong _sleep_count;
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oop _blocker_object;
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oop _blocker_object_owner;
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ThreadStackTrace* _stack_trace;
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ThreadConcurrentLocks* _concurrent_locks;
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ThreadSnapshot* _next;
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public:
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// Dummy snapshot
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ThreadSnapshot() : _thread(NULL), _threadObj(NULL),
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_blocker_object(NULL), _blocker_object_owner(NULL),
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_stack_trace(NULL), _concurrent_locks(NULL), _next(NULL) {};
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ThreadSnapshot(ThreadsList * t_list, JavaThread* thread);
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~ThreadSnapshot();
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java_lang_Thread::ThreadStatus thread_status() { return _thread_status; }
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oop threadObj() const { return _threadObj; }
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void set_next(ThreadSnapshot* n) { _next = n; }
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bool is_ext_suspended() { return _is_ext_suspended; }
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bool is_in_native() { return _is_in_native; }
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jlong contended_enter_count() { return _contended_enter_count; }
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jlong contended_enter_ticks() { return _contended_enter_ticks; }
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jlong monitor_wait_count() { return _monitor_wait_count; }
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jlong monitor_wait_ticks() { return _monitor_wait_ticks; }
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jlong sleep_count() { return _sleep_count; }
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jlong sleep_ticks() { return _sleep_ticks; }
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oop blocker_object() { return _blocker_object; }
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oop blocker_object_owner() { return _blocker_object_owner; }
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ThreadSnapshot* next() const { return _next; }
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ThreadStackTrace* get_stack_trace() { return _stack_trace; }
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ThreadConcurrentLocks* get_concurrent_locks() { return _concurrent_locks; }
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void dump_stack_at_safepoint(int max_depth, bool with_locked_monitors);
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void set_concurrent_locks(ThreadConcurrentLocks* l) { _concurrent_locks = l; }
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void oops_do(OopClosure* f);
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void metadata_do(void f(Metadata*));
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};
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class ThreadStackTrace : public CHeapObj<mtInternal> {
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private:
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JavaThread* _thread;
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int _depth; // number of stack frames added
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bool _with_locked_monitors;
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GrowableArray<StackFrameInfo*>* _frames;
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GrowableArray<oop>* _jni_locked_monitors;
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public:
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ThreadStackTrace(JavaThread* thread, bool with_locked_monitors);
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~ThreadStackTrace();
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JavaThread* thread() { return _thread; }
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StackFrameInfo* stack_frame_at(int i) { return _frames->at(i); }
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int get_stack_depth() { return _depth; }
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void add_stack_frame(javaVFrame* jvf);
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void dump_stack_at_safepoint(int max_depth);
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Handle allocate_fill_stack_trace_element_array(TRAPS);
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void oops_do(OopClosure* f);
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void metadata_do(void f(Metadata*));
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GrowableArray<oop>* jni_locked_monitors() { return _jni_locked_monitors; }
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int num_jni_locked_monitors() { return (_jni_locked_monitors != NULL ? _jni_locked_monitors->length() : 0); }
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bool is_owned_monitor_on_stack(oop object);
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void add_jni_locked_monitor(oop object) { _jni_locked_monitors->append(object); }
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};
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// StackFrameInfo for keeping Method* and bci during
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// stack walking for later construction of StackTraceElement[]
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// Java instances
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class StackFrameInfo : public CHeapObj<mtInternal> {
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private:
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Method* _method;
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int _bci;
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GrowableArray<oop>* _locked_monitors; // list of object monitors locked by this frame
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// We need to save the mirrors in the backtrace to keep the class
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// from being unloaded while we still have this stack trace.
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oop _class_holder;
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public:
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StackFrameInfo(javaVFrame* jvf, bool with_locked_monitors);
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~StackFrameInfo() {
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if (_locked_monitors != NULL) {
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delete _locked_monitors;
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}
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};
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Method* method() const { return _method; }
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int bci() const { return _bci; }
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void oops_do(OopClosure* f);
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void metadata_do(void f(Metadata*));
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int num_locked_monitors() { return (_locked_monitors != NULL ? _locked_monitors->length() : 0); }
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GrowableArray<oop>* locked_monitors() { return _locked_monitors; }
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void print_on(outputStream* st) const;
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};
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class ThreadConcurrentLocks : public CHeapObj<mtInternal> {
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private:
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GrowableArray<instanceOop>* _owned_locks;
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ThreadConcurrentLocks* _next;
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// This JavaThread* is protected in one of two different ways
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// depending on the usage of the ThreadConcurrentLocks object:
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// 1) by being stored in objects that are only allocated and used at a
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// safepoint (ConcurrentLocksDump), or 2) by being stored in objects
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// that are protected by a ThreadsListSetter (ThreadSnapshot inside
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// ThreadDumpResult).
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JavaThread* _thread;
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public:
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ThreadConcurrentLocks(JavaThread* thread);
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~ThreadConcurrentLocks();
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void add_lock(instanceOop o);
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void set_next(ThreadConcurrentLocks* n) { _next = n; }
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ThreadConcurrentLocks* next() { return _next; }
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JavaThread* java_thread() { return _thread; }
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GrowableArray<instanceOop>* owned_locks() { return _owned_locks; }
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void oops_do(OopClosure* f);
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};
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class ConcurrentLocksDump : public StackObj {
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private:
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ThreadConcurrentLocks* _map;
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ThreadConcurrentLocks* _last; // Last ThreadConcurrentLocks in the map
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bool _retain_map_on_free;
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void build_map(GrowableArray<oop>* aos_objects);
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void add_lock(JavaThread* thread, instanceOop o);
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public:
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ConcurrentLocksDump(bool retain_map_on_free) : _map(NULL), _last(NULL), _retain_map_on_free(retain_map_on_free) {
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assert(SafepointSynchronize::is_at_safepoint(), "Must be constructed at a safepoint.");
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};
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ConcurrentLocksDump() : _map(NULL), _last(NULL), _retain_map_on_free(false) {
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assert(SafepointSynchronize::is_at_safepoint(), "Must be constructed at a safepoint.");
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};
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~ConcurrentLocksDump();
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void dump_at_safepoint();
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ThreadConcurrentLocks* thread_concurrent_locks(JavaThread* thread);
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void print_locks_on(JavaThread* t, outputStream* st);
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};
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class ThreadDumpResult : public StackObj {
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private:
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int _num_threads;
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int _num_snapshots;
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ThreadSnapshot* _snapshots;
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ThreadSnapshot* _last;
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ThreadDumpResult* _next;
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ThreadsListSetter _setter; // Helper to set hazard ptr in the originating thread
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// which protects the JavaThreads in _snapshots.
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public:
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ThreadDumpResult();
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ThreadDumpResult(int num_threads);
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~ThreadDumpResult();
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void add_thread_snapshot(ThreadSnapshot* ts);
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void set_next(ThreadDumpResult* next) { _next = next; }
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ThreadDumpResult* next() { return _next; }
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int num_threads() { return _num_threads; }
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int num_snapshots() { return _num_snapshots; }
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ThreadSnapshot* snapshots() { return _snapshots; }
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void set_t_list() { _setter.set(); }
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ThreadsList* t_list();
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bool t_list_has_been_set() { return _setter.is_set(); }
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void oops_do(OopClosure* f);
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void metadata_do(void f(Metadata*));
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};
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class DeadlockCycle : public CHeapObj<mtInternal> {
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private:
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bool _is_deadlock;
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GrowableArray<JavaThread*>* _threads;
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DeadlockCycle* _next;
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public:
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DeadlockCycle();
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~DeadlockCycle();
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DeadlockCycle* next() { return _next; }
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void set_next(DeadlockCycle* d) { _next = d; }
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void add_thread(JavaThread* t) { _threads->append(t); }
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void reset() { _is_deadlock = false; _threads->clear(); }
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void set_deadlock(bool value) { _is_deadlock = value; }
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bool is_deadlock() { return _is_deadlock; }
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int num_threads() { return _threads->length(); }
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GrowableArray<JavaThread*>* threads() { return _threads; }
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void print_on_with(ThreadsList * t_list, outputStream* st) const;
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};
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// Utility class to get list of java threads.
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class ThreadsListEnumerator : public StackObj {
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private:
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GrowableArray<instanceHandle>* _threads_array;
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public:
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ThreadsListEnumerator(Thread* cur_thread,
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bool include_jvmti_agent_threads = false,
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bool include_jni_attaching_threads = true);
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int num_threads() { return _threads_array->length(); }
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instanceHandle get_threadObj(int index) { return _threads_array->at(index); }
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};
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// abstract utility class to set new thread states, and restore previous after the block exits
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class JavaThreadStatusChanger : public StackObj {
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private:
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java_lang_Thread::ThreadStatus _old_state;
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JavaThread* _java_thread;
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bool _is_alive;
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void save_old_state(JavaThread* java_thread) {
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_java_thread = java_thread;
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_is_alive = is_alive(java_thread);
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if (is_alive()) {
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_old_state = java_lang_Thread::get_thread_status(_java_thread->threadObj());
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}
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}
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public:
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static void set_thread_status(JavaThread* java_thread,
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java_lang_Thread::ThreadStatus state) {
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java_lang_Thread::set_thread_status(java_thread->threadObj(), state);
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}
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void set_thread_status(java_lang_Thread::ThreadStatus state) {
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if (is_alive()) {
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set_thread_status(_java_thread, state);
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}
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}
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JavaThreadStatusChanger(JavaThread* java_thread,
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java_lang_Thread::ThreadStatus state) : _old_state(java_lang_Thread::NEW) {
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save_old_state(java_thread);
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set_thread_status(state);
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}
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JavaThreadStatusChanger(JavaThread* java_thread) : _old_state(java_lang_Thread::NEW) {
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save_old_state(java_thread);
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}
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~JavaThreadStatusChanger() {
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set_thread_status(_old_state);
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}
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static bool is_alive(JavaThread* java_thread) {
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return java_thread != NULL && java_thread->threadObj() != NULL;
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}
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|
|
|
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)) {
|
|
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) :
|
|
JavaThreadStatusChanger(java_thread), _stat(NULL), _active(false) {
|
|
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() && 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
|