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 /*

  * Copyright (c) 2014, 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_MALLOC_TRACKER_HPP

 #define SHARE_VM_SERVICES_MALLOC_TRACKER_HPP

 #if INCLUDE_NMT

 #include "memory/allocation.hpp"

 #include "runtime/atomic.hpp"

 #include "services/nmtCommon.hpp"

 #include "utilities/nativeCallStack.hpp"

 /*

  * This counter class counts memory allocation and deallocation,

  * records total memory allocation size and number of allocations.

  * The counters are updated atomically.

  */

 class MemoryCounter VALUE_OBJ_CLASS_SPEC {

  private:

   size_t   _count;

   size_t   _size;

   DEBUG_ONLY(size_t   _peak_count;)

   DEBUG_ONLY(size_t   _peak_size; )

  public:

   MemoryCounter() : _count(0), _size(0) {

     DEBUG_ONLY(_peak_count = 0;)

     DEBUG_ONLY(_peak_size  = 0;)

   }

   inline void allocate(size_t sz) {

     Atomic::add(1, (volatile MemoryCounterType*)&_count);

     if (sz > 0) {

       Atomic::add((MemoryCounterType)sz, (volatile MemoryCounterType*)&_size);

       DEBUG_ONLY(_peak_size = MAX2(_peak_size, _size));

     }

     DEBUG_ONLY(_peak_count = MAX2(_peak_count, _count);)

   }

   inline void deallocate(size_t sz) {

     assert(_count > 0, "Negative counter");

     assert(_size >= sz, "Negative size");

     Atomic::add(-1, (volatile MemoryCounterType*)&_count);

     if (sz > 0) {

       Atomic::add(-(MemoryCounterType)sz, (volatile MemoryCounterType*)&_size);

     }

   }

   inline void resize(long sz) {

     if (sz != 0) {

       Atomic::add((MemoryCounterType)sz, (volatile MemoryCounterType*)&_size);

       DEBUG_ONLY(_peak_size = MAX2(_size, _peak_size);)

     }

   }

   inline size_t count() const { return _count; }

   inline size_t size()  const { return _size;  }

   DEBUG_ONLY(inline size_t peak_count() const { return _peak_count; })

   DEBUG_ONLY(inline size_t peak_size()  const { return _peak_size; })

 };

 /*

  * Malloc memory used by a particular subsystem.

  * It includes the memory acquired through os::malloc()

  * call and arena's backing memory.

  */

 class MallocMemory VALUE_OBJ_CLASS_SPEC {

  private:

   MemoryCounter _malloc;

   MemoryCounter _arena;

  public:

   MallocMemory() { }

   inline void record_malloc(size_t sz) {

     _malloc.allocate(sz);

   }

   inline void record_free(size_t sz) {

     _malloc.deallocate(sz);

   }

   inline void record_new_arena() {

     _arena.allocate(0);

   }

   inline void record_arena_free() {

     _arena.deallocate(0);

   }

   inline void record_arena_size_change(long sz) {

     _arena.resize(sz);

   }

   inline size_t malloc_size()  const { return _malloc.size(); }

   inline size_t malloc_count() const { return _malloc.count();}

   inline size_t arena_size()   const { return _arena.size();  }

   inline size_t arena_count()  const { return _arena.count(); }

   DEBUG_ONLY(inline const MemoryCounter& malloc_counter() const { return _malloc; })

   DEBUG_ONLY(inline const MemoryCounter& arena_counter()  const { return _arena;  })

 };

 class MallocMemorySummary;

 // A snapshot of malloc'd memory, includes malloc memory

 // usage by types and memory used by tracking itself.

 class MallocMemorySnapshot : public ResourceObj {

   friend class MallocMemorySummary;

  private:

   MallocMemory      _malloc[mt_number_of_types];

   MemoryCounter     _tracking_header;

  public:

   inline MallocMemory*  by_type(MEMFLAGS flags) {

     int index = NMTUtil::flag_to_index(flags);

     return &_malloc[index];

   }

   inline MallocMemory* by_index(int index) {

     assert(index >= 0, "Index out of bound");

     assert(index < mt_number_of_types, "Index out of bound");

     return &_malloc[index];

   }

   inline MemoryCounter* malloc_overhead() {

     return &_tracking_header;

   }

   // Total malloc'd memory amount

   size_t total() const;

   // Total malloc'd memory used by arenas

   size_t total_arena() const;

   inline size_t thread_count() const {

     MallocMemorySnapshot* s = const_cast<MallocMemorySnapshot*>(this);

     return s->by_type(mtThreadStack)->malloc_count();

   }

   void copy_to(MallocMemorySnapshot* s) {

     s->_tracking_header = _tracking_header;

     for (int index = 0; index < mt_number_of_types; index ++) {

       s->_malloc[index] = _malloc[index];

     }

   }

   // Make adjustment by subtracting chunks used by arenas

   // from total chunks to get total free chunk size

   void make_adjustment();

 };

 /*

  * This class is for collecting malloc statistics at summary level

  */

 class MallocMemorySummary : AllStatic {

  private:

   // Reserve memory for placement of MallocMemorySnapshot object

   static size_t _snapshot[CALC_OBJ_SIZE_IN_TYPE(MallocMemorySnapshot, size_t)];

  public:

    static void initialize();

    static inline void record_malloc(size_t size, MEMFLAGS flag) {

      as_snapshot()->by_type(flag)->record_malloc(size);

    }

    static inline void record_free(size_t size, MEMFLAGS flag) {

      as_snapshot()->by_type(flag)->record_free(size);

    }

    static inline void record_new_arena(MEMFLAGS flag) {

      as_snapshot()->by_type(flag)->record_new_arena();

    }

    static inline void record_arena_free(MEMFLAGS flag) {

      as_snapshot()->by_type(flag)->record_arena_free();

    }

    static inline void record_arena_size_change(long size, MEMFLAGS flag) {

      as_snapshot()->by_type(flag)->record_arena_size_change(size);

    }

    static void snapshot(MallocMemorySnapshot* s) {

      as_snapshot()->copy_to(s);

      s->make_adjustment();

    }

    // Record memory used by malloc tracking header

    static inline void record_new_malloc_header(size_t sz) {

      as_snapshot()->malloc_overhead()->allocate(sz);

    }

    static inline void record_free_malloc_header(size_t sz) {

      as_snapshot()->malloc_overhead()->deallocate(sz);

    }

    // The memory used by malloc tracking headers

    static inline size_t tracking_overhead() {

      return as_snapshot()->malloc_overhead()->size();

    }

   static MallocMemorySnapshot* as_snapshot() {

     return (MallocMemorySnapshot*)_snapshot;

   }

 };

 /*

  * Malloc tracking header.

  * To satisfy malloc alignment requirement, NMT uses 2 machine words for tracking purpose,

  * which ensures 8-bytes alignment on 32-bit systems and 16-bytes on 64-bit systems (Product build).

  */

 class MallocHeader VALUE_OBJ_CLASS_SPEC {

 #ifdef _LP64

   size_t           _size      : 62;

   size_t           _level     : 2;

   size_t           _flags     : 8;

   size_t           _pos_idx   : 16;

   size_t           _bucket_idx: 40;

 #define MAX_MALLOCSITE_TABLE_SIZE ((size_t)1 << 40)

 #define MAX_BUCKET_LENGTH         ((size_t)(1 << 16))

 #define MAX_MALLOC_SIZE           (((size_t)1 << 62) - 1)

 #else

   size_t           _size      : 30;

   size_t           _level     : 2;

   size_t           _flags     : 8;

   size_t           _pos_idx   : 8;

   size_t           _bucket_idx: 16;

 #define MAX_MALLOCSITE_TABLE_SIZE  ((size_t)(1 << 16))

 #define MAX_BUCKET_LENGTH          ((size_t)(1 << 8))

 // Max malloc size = 1GB - 1 on 32 bit system, such has total 4GB memory

 #define MAX_MALLOC_SIZE            ((size_t)(1 << 30) - 1)

 #endif  // _LP64

  public:

   // Summary tracking header

   MallocHeader(size_t size, MEMFLAGS flags) {

     assert(sizeof(MallocHeader) == sizeof(void*) * 2,

       "Wrong header size");

     _level = NMT_summary;

     _flags = flags;

     set_size(size);

     MallocMemorySummary::record_malloc(size, flags);

     MallocMemorySummary::record_new_malloc_header(sizeof(MallocHeader));

   }

   // Detail tracking header

   MallocHeader(size_t size, MEMFLAGS flags, const NativeCallStack& stack) {

     assert(sizeof(MallocHeader) == sizeof(void*) * 2,

       "Wrong header size");

     _level = NMT_detail;

     _flags = flags;

     set_size(size);

     size_t bucket_idx;

     size_t pos_idx;

     if (record_malloc_site(stack, size, &bucket_idx, &pos_idx)) {

       assert(bucket_idx <= MAX_MALLOCSITE_TABLE_SIZE, "Overflow bucket index");

       assert(pos_idx <= MAX_BUCKET_LENGTH, "Overflow bucket position index");

       _bucket_idx = bucket_idx;

       _pos_idx = pos_idx;

     }

     MallocMemorySummary::record_malloc(size, flags);

     MallocMemorySummary::record_new_malloc_header(sizeof(MallocHeader));

   }

   // Minimal tracking header

   MallocHeader() {

     assert(sizeof(MallocHeader) == sizeof(void*) * 2,

       "Wrong header size");

     _level = (unsigned short)NMT_minimal;

   }

   inline NMT_TrackingLevel tracking_level() const {

     return (NMT_TrackingLevel)_level;

   }

   inline size_t   size()  const { return _size; }

   inline MEMFLAGS flags() const { return (MEMFLAGS)_flags; }

   bool get_stack(NativeCallStack& stack) const;

   // Cleanup tracking information before the memory is released.

   void release() const;

  private:

   inline void set_size(size_t size) {

     assert(size <= MAX_MALLOC_SIZE, "Malloc size too large, should use virtual memory?");

     _size = size;

   }

   bool record_malloc_site(const NativeCallStack& stack, size_t size,

     size_t* bucket_idx, size_t* pos_idx) const;

 };

 // Main class called from MemTracker to track malloc activities

 class MallocTracker : AllStatic {

  public:

   // Initialize malloc tracker for specific tracking level

   static bool initialize(NMT_TrackingLevel level);

   static bool transition(NMT_TrackingLevel from, NMT_TrackingLevel to);

   // malloc tracking header size for specific tracking level

   static inline size_t malloc_header_size(NMT_TrackingLevel level) {

     return (level == NMT_off) ? 0 : sizeof(MallocHeader);

   }

   // Parameter name convention:

   // memblock :   the beginning address for user data

   // malloc_base: the beginning address that includes malloc tracking header

   //

   // The relationship:

   // memblock = (char*)malloc_base + sizeof(nmt header)

   //

   // Record  malloc on specified memory block

   static void* record_malloc(void* malloc_base, size_t size, MEMFLAGS flags,

     const NativeCallStack& stack, NMT_TrackingLevel level);

   // Record free on specified memory block

   static void* record_free(void* memblock);

   // Get tracking level of specified memory block

   static inline NMT_TrackingLevel get_memory_tracking_level(void* memblock);

   // Offset memory address to header address

   static inline void* get_base(void* memblock);

   static inline void* get_base(void* memblock, NMT_TrackingLevel level) {

     if (memblock == NULL || level == NMT_off) return memblock;

     return (char*)memblock - malloc_header_size(level);

   }

   // Get memory size

   static inline size_t get_size(void* memblock) {

     MallocHeader* header = malloc_header(memblock);

     assert(header->tracking_level() >= NMT_summary,

       "Wrong tracking level");

     return header->size();

   }

   // Get memory type

   static inline MEMFLAGS get_flags(void* memblock) {

     MallocHeader* header = malloc_header(memblock);

     assert(header->tracking_level() >= NMT_summary,

       "Wrong tracking level");

     return header->flags();

   }

   // Get header size

   static inline size_t get_header_size(void* memblock) {

     return (memblock == NULL) ? 0 : sizeof(MallocHeader);

   }

   static inline void record_new_arena(MEMFLAGS flags) {

     MallocMemorySummary::record_new_arena(flags);

   }

   static inline void record_arena_free(MEMFLAGS flags) {

     MallocMemorySummary::record_arena_free(flags);

   }

   static inline void record_arena_size_change(int size, MEMFLAGS flags) {

     MallocMemorySummary::record_arena_size_change(size, flags);

   }

  private:

   static inline MallocHeader* malloc_header(void *memblock) {

     assert(memblock != NULL, "NULL pointer");

     MallocHeader* header = (MallocHeader*)((char*)memblock - sizeof(MallocHeader));

     assert(header->tracking_level() >= NMT_minimal, "Bad header");

     return header;

   }

 };

 #endif // INCLUDE_NMT

 #endif //SHARE_VM_SERVICES_MALLOC_TRACKER_HPP