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 /*

  * 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) {

     assert(is_on(), "check by caller");

     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() {

     assert(is_on(), "native memory tracking is off");

     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