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 /*

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  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

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  * 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

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 #ifndef SHARE_VM_MEMORY_THREADLOCALALLOCBUFFER_HPP

 #define SHARE_VM_MEMORY_THREADLOCALALLOCBUFFER_HPP

 #include "gc_implementation/shared/gcUtil.hpp"

 #include "oops/typeArrayOop.hpp"

 #include "runtime/perfData.hpp"

 class GlobalTLABStats;

 // ThreadLocalAllocBuffer: a descriptor for thread-local storage used by

 // the threads for allocation.

 //            It is thread-private at any time, but maybe multiplexed over

 //            time across multiple threads. The park()/unpark() pair is

 //            used to make it available for such multiplexing.

 class ThreadLocalAllocBuffer: public CHeapObj<mtThread> {

   friend class VMStructs;

 private:

   HeapWord* _start;                              // address of TLAB

   HeapWord* _top;                                // address after last allocation

   HeapWord* _pf_top;                             // allocation prefetch watermark

   HeapWord* _end;                                // allocation end (excluding alignment_reserve)

   size_t    _desired_size;                       // desired size   (including alignment_reserve)

   size_t    _refill_waste_limit;                 // hold onto tlab if free() is larger than this

   static unsigned _target_refills;               // expected number of refills between GCs

   unsigned  _number_of_refills;

   unsigned  _fast_refill_waste;

   unsigned  _slow_refill_waste;

   unsigned  _gc_waste;

   unsigned  _slow_allocations;

   AdaptiveWeightedAverage _allocation_fraction;  // fraction of eden allocated in tlabs

   void accumulate_statistics();

   void initialize_statistics();

   void set_start(HeapWord* start)                { _start = start; }

   void set_end(HeapWord* end)                    { _end = end; }

   void set_top(HeapWord* top)                    { _top = top; }

   void set_pf_top(HeapWord* pf_top)              { _pf_top = pf_top; }

   void set_desired_size(size_t desired_size)     { _desired_size = desired_size; }

   void set_refill_waste_limit(size_t waste)      { _refill_waste_limit = waste;  }

   size_t initial_refill_waste_limit()            { return desired_size() / TLABRefillWasteFraction; }

   static int    target_refills()                 { return _target_refills; }

   size_t initial_desired_size();

   size_t remaining() const                       { return end() == NULL ? 0 : pointer_delta(hard_end(), top()); }

   // Make parsable and release it.

   void reset();

   // Resize based on amount of allocation, etc.

   void resize();

   void invariants() const { assert(top() >= start() && top() <= end(), "invalid tlab"); }

   void initialize(HeapWord* start, HeapWord* top, HeapWord* end);

   void print_stats(const char* tag);

   Thread* myThread();

   // statistics

   int number_of_refills() const { return _number_of_refills; }

   int fast_refill_waste() const { return _fast_refill_waste; }

   int slow_refill_waste() const { return _slow_refill_waste; }

   int gc_waste() const          { return _gc_waste; }

   int slow_allocations() const  { return _slow_allocations; }

   static GlobalTLABStats* _global_stats;

   static GlobalTLABStats* global_stats() { return _global_stats; }

 public:

   ThreadLocalAllocBuffer() : _allocation_fraction(TLABAllocationWeight) {

     // do nothing.  tlabs must be inited by initialize() calls

   }

   static const size_t min_size()                 { return align_object_size(MinTLABSize / HeapWordSize); }

   static const size_t max_size();

   HeapWord* start() const                        { return _start; }

   HeapWord* end() const                          { return _end; }

   HeapWord* hard_end() const                     { return _end + alignment_reserve(); }

   HeapWord* top() const                          { return _top; }

   HeapWord* pf_top() const                       { return _pf_top; }

   size_t desired_size() const                    { return _desired_size; }

   size_t used() const                            { return pointer_delta(top(), start()); }

   size_t used_bytes() const                      { return pointer_delta(top(), start(), 1); }

   size_t free() const                            { return pointer_delta(end(), top()); }

   // Don't discard tlab if remaining space is larger than this.

   size_t refill_waste_limit() const              { return _refill_waste_limit; }

   // Allocate size HeapWords. The memory is NOT initialized to zero.

   inline HeapWord* allocate(size_t size);

   // Reserve space at the end of TLAB

   static size_t end_reserve() {

     int reserve_size = typeArrayOopDesc::header_size(T_INT);

     return MAX2(reserve_size, VM_Version::reserve_for_allocation_prefetch());

   }

   static size_t alignment_reserve()              { return align_object_size(end_reserve()); }

   static size_t alignment_reserve_in_bytes()     { return alignment_reserve() * HeapWordSize; }

   // Return tlab size or remaining space in eden such that the

   // space is large enough to hold obj_size and necessary fill space.

   // Otherwise return 0;

   inline size_t compute_size(size_t obj_size);

   // Record slow allocation

   inline void record_slow_allocation(size_t obj_size);

   // Initialization at startup

   static void startup_initialization();

   // Make an in-use tlab parsable, optionally also retiring it.

   void make_parsable(bool retire);

   // Retire in-use tlab before allocation of a new tlab

   void clear_before_allocation();

   // Accumulate statistics across all tlabs before gc

   static void accumulate_statistics_before_gc();

   // Resize tlabs for all threads

   static void resize_all_tlabs();

   void fill(HeapWord* start, HeapWord* top, size_t new_size);

   void initialize();

   static size_t refill_waste_limit_increment()   { return TLABWasteIncrement; }

   // Code generation support

   static ByteSize start_offset()                 { return byte_offset_of(ThreadLocalAllocBuffer, _start); }

   static ByteSize end_offset()                   { return byte_offset_of(ThreadLocalAllocBuffer, _end  ); }

   static ByteSize top_offset()                   { return byte_offset_of(ThreadLocalAllocBuffer, _top  ); }

   static ByteSize pf_top_offset()                { return byte_offset_of(ThreadLocalAllocBuffer, _pf_top  ); }

   static ByteSize size_offset()                  { return byte_offset_of(ThreadLocalAllocBuffer, _desired_size ); }

   static ByteSize refill_waste_limit_offset()    { return byte_offset_of(ThreadLocalAllocBuffer, _refill_waste_limit ); }

   static ByteSize number_of_refills_offset()     { return byte_offset_of(ThreadLocalAllocBuffer, _number_of_refills ); }

   static ByteSize fast_refill_waste_offset()     { return byte_offset_of(ThreadLocalAllocBuffer, _fast_refill_waste ); }

   static ByteSize slow_allocations_offset()      { return byte_offset_of(ThreadLocalAllocBuffer, _slow_allocations ); }

   void verify();

 };

 class GlobalTLABStats: public CHeapObj<mtThread> {

 private:

   // Accumulate perfdata in private variables because

   // PerfData should be write-only for security reasons

   // (see perfData.hpp)

   unsigned _allocating_threads;

   unsigned _total_refills;

   unsigned _max_refills;

   size_t   _total_allocation;

   size_t   _total_gc_waste;

   size_t   _max_gc_waste;

   size_t   _total_slow_refill_waste;

   size_t   _max_slow_refill_waste;

   size_t   _total_fast_refill_waste;

   size_t   _max_fast_refill_waste;

   unsigned _total_slow_allocations;

   unsigned _max_slow_allocations;

   PerfVariable* _perf_allocating_threads;

   PerfVariable* _perf_total_refills;

   PerfVariable* _perf_max_refills;

   PerfVariable* _perf_allocation;

   PerfVariable* _perf_gc_waste;

   PerfVariable* _perf_max_gc_waste;

   PerfVariable* _perf_slow_refill_waste;

   PerfVariable* _perf_max_slow_refill_waste;

   PerfVariable* _perf_fast_refill_waste;

   PerfVariable* _perf_max_fast_refill_waste;

   PerfVariable* _perf_slow_allocations;

   PerfVariable* _perf_max_slow_allocations;

   AdaptiveWeightedAverage _allocating_threads_avg;

 public:

   GlobalTLABStats();

   // Initialize all counters

   void initialize();

   // Write all perf counters to the perf_counters

   void publish();

   void print();

   // Accessors

   unsigned allocating_threads_avg() {

     return MAX2((unsigned)(_allocating_threads_avg.average() + 0.5), 1U);

   }

   size_t allocation() {

     return _total_allocation;

   }

   // Update methods

   void update_allocating_threads() {

     _allocating_threads++;

   }

   void update_number_of_refills(unsigned value) {

     _total_refills += value;

     _max_refills    = MAX2(_max_refills, value);

   }

   void update_allocation(size_t value) {

     _total_allocation += value;

   }

   void update_gc_waste(size_t value) {

     _total_gc_waste += value;

     _max_gc_waste    = MAX2(_max_gc_waste, value);

   }

   void update_fast_refill_waste(size_t value) {

     _total_fast_refill_waste += value;

     _max_fast_refill_waste    = MAX2(_max_fast_refill_waste, value);

   }

   void update_slow_refill_waste(size_t value) {

     _total_slow_refill_waste += value;

     _max_slow_refill_waste    = MAX2(_max_slow_refill_waste, value);

   }

   void update_slow_allocations(unsigned value) {

     _total_slow_allocations += value;

     _max_slow_allocations    = MAX2(_max_slow_allocations, value);

   }

 };

 #endif // SHARE_VM_MEMORY_THREADLOCALALLOCBUFFER_HPP