/* * Copyright (c) 2012, 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_MEM_TRACKER_HPP #define SHARE_VM_SERVICES_MEM_TRACKER_HPP #include "memory/allocation.hpp" #include "runtime/globals.hpp" #include "runtime/mutex.hpp" #include "runtime/os.hpp" #include "runtime/thread.hpp" #include "services/memPtr.hpp" #include "services/memRecorder.hpp" #include "services/memSnapshot.hpp" #include "services/memTrackWorker.hpp" #ifdef SOLARIS #include "thread_solaris.inline.hpp" #endif #ifdef _DEBUG_ #define DEBUG_CALLER_PC os::get_caller_pc(3) #else #define DEBUG_CALLER_PC 0 #endif // The thread closure walks threads to collect per-thread // memory recorders at NMT sync point class SyncThreadRecorderClosure : public ThreadClosure { private: int _thread_count; public: SyncThreadRecorderClosure() { _thread_count =0; } void do_thread(Thread* thread); int get_thread_count() const { return _thread_count; } }; class BaselineOutputer; class MemSnapshot; class MemTrackWorker; class Thread; /* * MemTracker is the 'gate' class to native memory tracking runtime. */ class MemTracker : AllStatic { friend class MemTrackWorker; friend class MemSnapshot; friend class SyncThreadRecorderClosure; // NMT state enum NMTStates { NMT_uninited, // not yet initialized NMT_bootstrapping_single_thread, // bootstrapping, VM is in single thread mode NMT_bootstrapping_multi_thread, // bootstrapping, VM is about to enter multi-thread mode NMT_started, // NMT fully started NMT_shutdown_pending, // shutdown pending NMT_final_shutdown, // in final phase of shutdown NMT_shutdown // shutdown }; // native memory tracking level enum NMTLevel { NMT_off, // native memory tracking is off NMT_summary, // don't track callsite NMT_detail // track callsite also }; public: enum ShutdownReason { NMT_shutdown_none, // no shutdown requested NMT_shutdown_user, // user requested shutdown NMT_normal, // normal shutdown, process exit NMT_out_of_memory, // shutdown due to out of memory NMT_initialization, // shutdown due to initialization failure NMT_use_malloc_only, // can not combine NMT with UseMallocOnly flag NMT_error_reporting, // shutdown by vmError::report_and_die() NMT_out_of_generation, // running out of generation queue NMT_sequence_overflow // overflow the sequence number }; public: // initialize NMT tracking level from command line options, called // from VM command line parsing code static void init_tracking_options(const char* option_line); // if NMT is enabled to record memory activities static inline bool is_on() { return (_tracking_level >= NMT_summary && _state >= NMT_bootstrapping_single_thread); } // user readable reason for shutting down NMT static const char* reason() { switch(_reason) { case NMT_shutdown_none: return "Native memory tracking is not enabled"; case NMT_shutdown_user: return "Native memory tracking has been shutdown by user"; case NMT_normal: return "Native memory tracking has been shutdown due to process exiting"; case NMT_out_of_memory: return "Native memory tracking has been shutdown due to out of native memory"; case NMT_initialization: return "Native memory tracking failed to initialize"; case NMT_error_reporting: return "Native memory tracking has been shutdown due to error reporting"; case NMT_out_of_generation: return "Native memory tracking has been shutdown due to running out of generation buffer"; case NMT_sequence_overflow: return "Native memory tracking has been shutdown due to overflow the sequence number"; case NMT_use_malloc_only: return "Native memory tracking is not supported when UseMallocOnly is on"; default: ShouldNotReachHere(); return NULL; } } // test if we can walk native stack static bool can_walk_stack() { // native stack is not walkable during bootstrapping on sparc #if defined(SPARC) return (_state == NMT_started); #else return (_state >= NMT_bootstrapping_single_thread && _state <= NMT_started); #endif } // if native memory tracking tracks callsite static inline bool track_callsite() { return _tracking_level == NMT_detail; } // shutdown native memory tracking capability. Native memory tracking // can be shutdown by VM when it encounters low memory scenarios. // Memory tracker should gracefully shutdown itself, and preserve the // latest memory statistics for post morten diagnosis. static void shutdown(ShutdownReason reason); // if there is shutdown requested static inline bool shutdown_in_progress() { return (_state >= NMT_shutdown_pending); } // bootstrap native memory tracking, so it can start to collect raw data // before worker thread can start // the first phase of bootstrapping, when VM still in single-threaded mode static void bootstrap_single_thread(); // the second phase of bootstrapping, VM is about or already in multi-threaded mode static void bootstrap_multi_thread(); // start() has to be called when VM still in single thread mode, but after // command line option parsing is done. static void start(); // record a 'malloc' call static inline void record_malloc(address addr, size_t size, MEMFLAGS flags, address pc = 0, Thread* thread = NULL) { if (NMT_CAN_TRACK(flags)) { create_memory_record(addr, (flags|MemPointerRecord::malloc_tag()), size, pc, thread); } } // record a 'free' call static inline void record_free(address addr, MEMFLAGS flags, Thread* thread = NULL) { if (is_on() && NMT_CAN_TRACK(flags)) { create_memory_record(addr, MemPointerRecord::free_tag(), 0, 0, thread); } } // record a 'realloc' call static inline void record_realloc(address old_addr, address new_addr, size_t size, MEMFLAGS flags, address pc = 0, Thread* thread = NULL) { if (is_on()) { record_free(old_addr, flags, thread); record_malloc(new_addr, size, flags, pc, thread); } } // record arena size static inline void record_arena_size(address addr, size_t size) { // we add a positive offset to arena address, so we can have arena size record // sorted after arena record if (is_on() && !UseMallocOnly) { create_memory_record((addr + sizeof(void*)), MemPointerRecord::arena_size_tag(), size, 0, NULL); } } // record a virtual memory 'reserve' call static inline void record_virtual_memory_reserve(address addr, size_t size, address pc = 0, Thread* thread = NULL) { if (is_on()) { assert(size > 0, "reserve szero size"); create_memory_record(addr, MemPointerRecord::virtual_memory_reserve_tag(), size, pc, thread); } } // record a virtual memory 'commit' call static inline void record_virtual_memory_commit(address addr, size_t size, address pc = 0, Thread* thread = NULL) { if (is_on()) { create_memory_record(addr, MemPointerRecord::virtual_memory_commit_tag(), size, pc, thread); } } // record a virtual memory 'uncommit' call static inline void record_virtual_memory_uncommit(address addr, size_t size, Thread* thread = NULL) { if (is_on()) { create_memory_record(addr, MemPointerRecord::virtual_memory_uncommit_tag(), size, 0, thread); } } // record a virtual memory 'release' call static inline void record_virtual_memory_release(address addr, size_t size, Thread* thread = NULL) { if (is_on()) { create_memory_record(addr, MemPointerRecord::virtual_memory_release_tag(), size, 0, thread); } } // record memory type on virtual memory base address static inline void record_virtual_memory_type(address base, MEMFLAGS flags, Thread* thread = NULL) { if (is_on()) { assert(base > 0, "wrong base address"); assert((flags & (~mt_masks)) == 0, "memory type only"); create_memory_record(base, (flags | MemPointerRecord::virtual_memory_type_tag()), 0, 0, thread); } } // create memory baseline of current memory snapshot static bool baseline(); // is there a memory baseline static bool has_baseline() { return _baseline.baselined(); } // print memory usage from current snapshot static bool print_memory_usage(BaselineOutputer& out, size_t unit, bool summary_only = true); // compare memory usage between current snapshot and baseline static bool compare_memory_usage(BaselineOutputer& out, size_t unit, bool summary_only = true); // sync is called within global safepoint to synchronize nmt data static void sync(); // called when a thread is about to exit static void thread_exiting(JavaThread* thread); // retrieve global snapshot static MemSnapshot* get_snapshot() { if (shutdown_in_progress()) { return NULL; } return _snapshot; } // print tracker stats NOT_PRODUCT(static void print_tracker_stats(outputStream* st);) NOT_PRODUCT(static void walk_stack(int toSkip, char* buf, int len);) private: // start native memory tracking worker thread static bool start_worker(); // called by worker thread to complete shutdown process static void final_shutdown(); protected: // retrieve per-thread recorder of the specified thread. // if the recorder is full, it will be enqueued to overflow // queue, a new recorder is acquired from recorder pool or a // new instance is created. // when thread == NULL, it means global recorder static MemRecorder* get_thread_recorder(JavaThread* thread); // per-thread recorder pool static void release_thread_recorder(MemRecorder* rec); static void delete_all_pooled_recorders(); // pending recorder queue. Recorders are queued to pending queue // when they are overflowed or collected at nmt sync point. static void enqueue_pending_recorder(MemRecorder* rec); static MemRecorder* get_pending_recorders(); static void delete_all_pending_recorders(); private: // retrieve a pooled memory record or create new one if there is not // one available static MemRecorder* get_new_or_pooled_instance(); static void create_memory_record(address addr, MEMFLAGS type, size_t size, address pc, Thread* thread); static void create_record_in_recorder(address addr, MEMFLAGS type, size_t size, address pc, JavaThread* thread); private: // global memory snapshot static MemSnapshot* _snapshot; // a memory baseline of snapshot static MemBaseline _baseline; // query lock static Mutex* _query_lock; // a thread can start to allocate memory before it is attached // to VM 'Thread', those memory activities are recorded here. // ThreadCritical is required to guard this global recorder. static MemRecorder* _global_recorder; // main thread id debug_only(static intx _main_thread_tid;) // pending recorders to be merged static volatile MemRecorder* _merge_pending_queue; NOT_PRODUCT(static volatile jint _pending_recorder_count;) // pooled memory recorders static volatile MemRecorder* _pooled_recorders; // memory recorder pool management, uses following // counter to determine if a released memory recorder // should be pooled // latest thread count static int _thread_count; // pooled recorder count static volatile jint _pooled_recorder_count; // worker thread to merge pending recorders into snapshot static MemTrackWorker* _worker_thread; // how many safepoints we skipped without entering sync point static int _sync_point_skip_count; // if the tracker is properly intialized static bool _is_tracker_ready; // tracking level (off, summary and detail) static enum NMTLevel _tracking_level; // current nmt state static volatile enum NMTStates _state; // the reason for shutting down nmt static enum ShutdownReason _reason; }; #endif // SHARE_VM_SERVICES_MEM_TRACKER_HPP