jdk8-mips64-public/hotspot: src/share/vm/memory/threadLocalAllocBuffer.cpp@09d00c18e323

     1 /*

     2  * Copyright (c) 1999, 2011, Oracle and/or its affiliates. All rights reserved.

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

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  *

    23  */

    25 #include "precompiled.hpp"

    26 #include "memory/genCollectedHeap.hpp"

    27 #include "memory/resourceArea.hpp"

    28 #include "memory/threadLocalAllocBuffer.inline.hpp"

    29 #include "memory/universe.inline.hpp"

    30 #include "oops/oop.inline.hpp"

    31 #include "utilities/copy.hpp"

    32 #ifdef TARGET_OS_FAMILY_linux

    33 # include "thread_linux.inline.hpp"

    34 #endif

    35 #ifdef TARGET_OS_FAMILY_solaris

    36 # include "thread_solaris.inline.hpp"

    37 #endif

    38 #ifdef TARGET_OS_FAMILY_windows

    39 # include "thread_windows.inline.hpp"

    40 #endif

    41 #ifdef TARGET_OS_FAMILY_bsd

    42 # include "thread_bsd.inline.hpp"

    43 #endif

    45 // Thread-Local Edens support

    47 // static member initialization

    48 unsigned         ThreadLocalAllocBuffer::_target_refills = 0;

    49 GlobalTLABStats* ThreadLocalAllocBuffer::_global_stats   = NULL;

    51 void ThreadLocalAllocBuffer::clear_before_allocation() {

    52   _slow_refill_waste += (unsigned)remaining();

    53   make_parsable(true);   // also retire the TLAB

    54 }

    56 void ThreadLocalAllocBuffer::accumulate_statistics_before_gc() {

    57   global_stats()->initialize();

    59   for(JavaThread *thread = Threads::first(); thread; thread = thread->next()) {

    60     thread->tlab().accumulate_statistics();

    61     thread->tlab().initialize_statistics();

    62   }

    64   // Publish new stats if some allocation occurred.

    65   if (global_stats()->allocation() != 0) {

    66     global_stats()->publish();

    67     if (PrintTLAB) {

    68       global_stats()->print();

    69     }

    70   }

    71 }

    73 void ThreadLocalAllocBuffer::accumulate_statistics() {

    74   size_t capacity = Universe::heap()->tlab_capacity(myThread()) / HeapWordSize;

    75   size_t unused   = Universe::heap()->unsafe_max_tlab_alloc(myThread()) / HeapWordSize;

    76   size_t used     = capacity - unused;

    78   // Update allocation history if a reasonable amount of eden was allocated.

    79   bool update_allocation_history = used > 0.5 * capacity;

    81   _gc_waste += (unsigned)remaining();

    83   if (PrintTLAB && (_number_of_refills > 0 || Verbose)) {

    84     print_stats("gc");

    85   }

    87   if (_number_of_refills > 0) {

    89     if (update_allocation_history) {

    90       // Average the fraction of eden allocated in a tlab by this

    91       // thread for use in the next resize operation.

    92       // _gc_waste is not subtracted because it's included in

    93       // "used".

    94       size_t allocation = _number_of_refills * desired_size();

    95       double alloc_frac = allocation / (double) used;

    96       _allocation_fraction.sample(alloc_frac);

    97     }

    98     global_stats()->update_allocating_threads();

    99     global_stats()->update_number_of_refills(_number_of_refills);

   100     global_stats()->update_allocation(_number_of_refills * desired_size());

   101     global_stats()->update_gc_waste(_gc_waste);

   102     global_stats()->update_slow_refill_waste(_slow_refill_waste);

   103     global_stats()->update_fast_refill_waste(_fast_refill_waste);

   105   } else {

   106     assert(_number_of_refills == 0 && _fast_refill_waste == 0 &&

   107            _slow_refill_waste == 0 && _gc_waste          == 0,

   108            "tlab stats == 0");

   109   }

   110   global_stats()->update_slow_allocations(_slow_allocations);

   111 }

   113 // Fills the current tlab with a dummy filler array to create

   114 // an illusion of a contiguous Eden and optionally retires the tlab.

   115 // Waste accounting should be done in caller as appropriate; see,

   116 // for example, clear_before_allocation().

   117 void ThreadLocalAllocBuffer::make_parsable(bool retire) {

   118   if (end() != NULL) {

   119     invariants();

   121     if (retire) {

   122       myThread()->incr_allocated_bytes(used_bytes());

   123     }

   125     CollectedHeap::fill_with_object(top(), hard_end(), retire);

   127     if (retire || ZeroTLAB) {  // "Reset" the TLAB

   128       set_start(NULL);

   129       set_top(NULL);

   130       set_pf_top(NULL);

   131       set_end(NULL);

   132     }

   133   }

   134   assert(!(retire || ZeroTLAB)  ||

   135          (start() == NULL && end() == NULL && top() == NULL),

   136          "TLAB must be reset");

   137 }

   139 void ThreadLocalAllocBuffer::resize_all_tlabs() {

   140   for(JavaThread *thread = Threads::first(); thread; thread = thread->next()) {

   141     thread->tlab().resize();

   142   }

   143 }

   145 void ThreadLocalAllocBuffer::resize() {

   147   if (ResizeTLAB) {

   148     // Compute the next tlab size using expected allocation amount

   149     size_t alloc = (size_t)(_allocation_fraction.average() *

   150                             (Universe::heap()->tlab_capacity(myThread()) / HeapWordSize));

   151     size_t new_size = alloc / _target_refills;

   153     new_size = MIN2(MAX2(new_size, min_size()), max_size());

   155     size_t aligned_new_size = align_object_size(new_size);

   157     if (PrintTLAB && Verbose) {

   158       gclog_or_tty->print("TLAB new size: thread: " INTPTR_FORMAT " [id: %2d]"

   159                           " refills %d  alloc: %8.6f desired_size: " SIZE_FORMAT " -> " SIZE_FORMAT "\n",

   160                           myThread(), myThread()->osthread()->thread_id(),

   161                           _target_refills, _allocation_fraction.average(), desired_size(), aligned_new_size);

   162     }

   163     set_desired_size(aligned_new_size);

   165     set_refill_waste_limit(initial_refill_waste_limit());

   166   }

   167 }

   169 void ThreadLocalAllocBuffer::initialize_statistics() {

   170     _number_of_refills = 0;

   171     _fast_refill_waste = 0;

   172     _slow_refill_waste = 0;

   173     _gc_waste          = 0;

   174     _slow_allocations  = 0;

   175 }

   177 void ThreadLocalAllocBuffer::fill(HeapWord* start,

   178                                   HeapWord* top,

   179                                   size_t    new_size) {

   180   _number_of_refills++;

   181   if (PrintTLAB && Verbose) {

   182     print_stats("fill");

   183   }

   184   assert(top <= start + new_size - alignment_reserve(), "size too small");

   185   initialize(start, top, start + new_size - alignment_reserve());

   187   // Reset amount of internal fragmentation

   188   set_refill_waste_limit(initial_refill_waste_limit());

   189 }

   191 void ThreadLocalAllocBuffer::initialize(HeapWord* start,

   192                                         HeapWord* top,

   193                                         HeapWord* end) {

   194   set_start(start);

   195   set_top(top);

   196   set_pf_top(top);

   197   set_end(end);

   198   invariants();

   199 }

   201 void ThreadLocalAllocBuffer::initialize() {

   202   initialize(NULL,                    // start

   203              NULL,                    // top

   204              NULL);                   // end

   206   set_desired_size(initial_desired_size());

   208   // Following check is needed because at startup the main (primordial)

   209   // thread is initialized before the heap is.  The initialization for

   210   // this thread is redone in startup_initialization below.

   211   if (Universe::heap() != NULL) {

   212     size_t capacity   = Universe::heap()->tlab_capacity(myThread()) / HeapWordSize;

   213     double alloc_frac = desired_size() * target_refills() / (double) capacity;

   214     _allocation_fraction.sample(alloc_frac);

   215   }

   217   set_refill_waste_limit(initial_refill_waste_limit());

   219   initialize_statistics();

   220 }

   222 void ThreadLocalAllocBuffer::startup_initialization() {

   224   // Assuming each thread's active tlab is, on average,

   225   // 1/2 full at a GC

   226   _target_refills = 100 / (2 * TLABWasteTargetPercent);

   227   _target_refills = MAX2(_target_refills, (unsigned)1U);

   229   _global_stats = new GlobalTLABStats();

   231   // During jvm startup, the main (primordial) thread is initialized

   232   // before the heap is initialized.  So reinitialize it now.

   233   guarantee(Thread::current()->is_Java_thread(), "tlab initialization thread not Java thread");

   234   Thread::current()->tlab().initialize();

   236   if (PrintTLAB && Verbose) {

   237     gclog_or_tty->print("TLAB min: " SIZE_FORMAT " initial: " SIZE_FORMAT " max: " SIZE_FORMAT "\n",

   238                         min_size(), Thread::current()->tlab().initial_desired_size(), max_size());

   239   }

   240 }

   242 size_t ThreadLocalAllocBuffer::initial_desired_size() {

   243   size_t init_sz;

   245   if (TLABSize > 0) {

   246     init_sz = MIN2(TLABSize / HeapWordSize, max_size());

   247   } else if (global_stats() == NULL) {

   248     // Startup issue - main thread initialized before heap initialized.

   249     init_sz = min_size();

   250   } else {

   251     // Initial size is a function of the average number of allocating threads.

   252     unsigned nof_threads = global_stats()->allocating_threads_avg();

   254     init_sz  = (Universe::heap()->tlab_capacity(myThread()) / HeapWordSize) /

   255                       (nof_threads * target_refills());

   256     init_sz = align_object_size(init_sz);

   257     init_sz = MIN2(MAX2(init_sz, min_size()), max_size());

   258   }

   259   return init_sz;

   260 }

   262 const size_t ThreadLocalAllocBuffer::max_size() {

   264   // TLABs can't be bigger than we can fill with a int[Integer.MAX_VALUE].

   265   // This restriction could be removed by enabling filling with multiple arrays.

   266   // If we compute that the reasonable way as

   267   //    header_size + ((sizeof(jint) * max_jint) / HeapWordSize)

   268   // we'll overflow on the multiply, so we do the divide first.

   269   // We actually lose a little by dividing first,

   270   // but that just makes the TLAB  somewhat smaller than the biggest array,

   271   // which is fine, since we'll be able to fill that.

   273   size_t unaligned_max_size = typeArrayOopDesc::header_size(T_INT) +

   274                               sizeof(jint) *

   275                               ((juint) max_jint / (size_t) HeapWordSize);

   276   return align_size_down(unaligned_max_size, MinObjAlignment);

   277 }

   279 void ThreadLocalAllocBuffer::print_stats(const char* tag) {

   280   Thread* thrd = myThread();

   281   size_t waste = _gc_waste + _slow_refill_waste + _fast_refill_waste;

   282   size_t alloc = _number_of_refills * _desired_size;

   283   double waste_percent = alloc == 0 ? 0.0 :

   284                       100.0 * waste / alloc;

   285   size_t tlab_used  = Universe::heap()->tlab_capacity(thrd) -

   286                       Universe::heap()->unsafe_max_tlab_alloc(thrd);

   287   gclog_or_tty->print("TLAB: %s thread: " INTPTR_FORMAT " [id: %2d]"

   288                       " desired_size: " SIZE_FORMAT "KB"

   289                       " slow allocs: %d  refill waste: " SIZE_FORMAT "B"

   290                       " alloc:%8.5f %8.0fKB refills: %d waste %4.1f%% gc: %dB"

   291                       " slow: %dB fast: %dB\n",

   292                       tag, thrd, thrd->osthread()->thread_id(),

   293                       _desired_size / (K / HeapWordSize),

   294                       _slow_allocations, _refill_waste_limit * HeapWordSize,

   295                       _allocation_fraction.average(),

   296                       _allocation_fraction.average() * tlab_used / K,

   297                       _number_of_refills, waste_percent,

   298                       _gc_waste * HeapWordSize,

   299                       _slow_refill_waste * HeapWordSize,

   300                       _fast_refill_waste * HeapWordSize);

   301 }

   303 void ThreadLocalAllocBuffer::verify() {

   304   HeapWord* p = start();

   305   HeapWord* t = top();

   306   HeapWord* prev_p = NULL;

   307   while (p < t) {

   308     oop(p)->verify();

   309     prev_p = p;

   310     p += oop(p)->size();

   311   }

   312   guarantee(p == top(), "end of last object must match end of space");

   313 }

   315 Thread* ThreadLocalAllocBuffer::myThread() {

   316   return (Thread*)(((char *)this) +

   317                    in_bytes(start_offset()) -

   318                    in_bytes(Thread::tlab_start_offset()));

   319 }

   322 GlobalTLABStats::GlobalTLABStats() :

   323   _allocating_threads_avg(TLABAllocationWeight) {

   325   initialize();

   327   _allocating_threads_avg.sample(1); // One allocating thread at startup

   329   if (UsePerfData) {

   331     EXCEPTION_MARK;

   332     ResourceMark rm;

   334     char* cname = PerfDataManager::counter_name("tlab", "allocThreads");

   335     _perf_allocating_threads =

   336       PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK);

   338     cname = PerfDataManager::counter_name("tlab", "fills");

   339     _perf_total_refills =

   340       PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK);

   342     cname = PerfDataManager::counter_name("tlab", "maxFills");

   343     _perf_max_refills =

   344       PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK);

   346     cname = PerfDataManager::counter_name("tlab", "alloc");

   347     _perf_allocation =

   348       PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK);

   350     cname = PerfDataManager::counter_name("tlab", "gcWaste");

   351     _perf_gc_waste =

   352       PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK);

   354     cname = PerfDataManager::counter_name("tlab", "maxGcWaste");

   355     _perf_max_gc_waste =

   356       PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK);

   358     cname = PerfDataManager::counter_name("tlab", "slowWaste");

   359     _perf_slow_refill_waste =

   360       PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK);

   362     cname = PerfDataManager::counter_name("tlab", "maxSlowWaste");

   363     _perf_max_slow_refill_waste =

   364       PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK);

   366     cname = PerfDataManager::counter_name("tlab", "fastWaste");

   367     _perf_fast_refill_waste =

   368       PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK);

   370     cname = PerfDataManager::counter_name("tlab", "maxFastWaste");

   371     _perf_max_fast_refill_waste =

   372       PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK);

   374     cname = PerfDataManager::counter_name("tlab", "slowAlloc");

   375     _perf_slow_allocations =

   376       PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK);

   378     cname = PerfDataManager::counter_name("tlab", "maxSlowAlloc");

   379     _perf_max_slow_allocations =

   380       PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK);

   381   }

   382 }

   384 void GlobalTLABStats::initialize() {

   385   // Clear counters summarizing info from all threads

   386   _allocating_threads      = 0;

   387   _total_refills           = 0;

   388   _max_refills             = 0;

   389   _total_allocation        = 0;

   390   _total_gc_waste          = 0;

   391   _max_gc_waste            = 0;

   392   _total_slow_refill_waste = 0;

   393   _max_slow_refill_waste   = 0;

   394   _total_fast_refill_waste = 0;

   395   _max_fast_refill_waste   = 0;

   396   _total_slow_allocations  = 0;

   397   _max_slow_allocations    = 0;

   398 }

   400 void GlobalTLABStats::publish() {

   401   _allocating_threads_avg.sample(_allocating_threads);

   402   if (UsePerfData) {

   403     _perf_allocating_threads   ->set_value(_allocating_threads);

   404     _perf_total_refills        ->set_value(_total_refills);

   405     _perf_max_refills          ->set_value(_max_refills);

   406     _perf_allocation           ->set_value(_total_allocation);

   407     _perf_gc_waste             ->set_value(_total_gc_waste);

   408     _perf_max_gc_waste         ->set_value(_max_gc_waste);

   409     _perf_slow_refill_waste    ->set_value(_total_slow_refill_waste);

   410     _perf_max_slow_refill_waste->set_value(_max_slow_refill_waste);

   411     _perf_fast_refill_waste    ->set_value(_total_fast_refill_waste);

   412     _perf_max_fast_refill_waste->set_value(_max_fast_refill_waste);

   413     _perf_slow_allocations     ->set_value(_total_slow_allocations);

   414     _perf_max_slow_allocations ->set_value(_max_slow_allocations);

   415   }

   416 }

   418 void GlobalTLABStats::print() {

   419   size_t waste = _total_gc_waste + _total_slow_refill_waste + _total_fast_refill_waste;

   420   double waste_percent = _total_allocation == 0 ? 0.0 :

   421                          100.0 * waste / _total_allocation;

   422   gclog_or_tty->print("TLAB totals: thrds: %d  refills: %d max: %d"

   423                       " slow allocs: %d max %d waste: %4.1f%%"

   424                       " gc: " SIZE_FORMAT "B max: " SIZE_FORMAT "B"

   425                       " slow: " SIZE_FORMAT "B max: " SIZE_FORMAT "B"

   426                       " fast: " SIZE_FORMAT "B max: " SIZE_FORMAT "B\n",

   427                       _allocating_threads,

   428                       _total_refills, _max_refills,

   429                       _total_slow_allocations, _max_slow_allocations,

   430                       waste_percent,

   431                       _total_gc_waste * HeapWordSize,

   432                       _max_gc_waste * HeapWordSize,

   433                       _total_slow_refill_waste * HeapWordSize,

   434                       _max_slow_refill_waste * HeapWordSize,

   435                       _total_fast_refill_waste * HeapWordSize,

   436                       _max_fast_refill_waste * HeapWordSize);

   437 }

Mercurial > jdk8-mips64-public > hotspot / file revision

src/share/vm/memory/threadLocalAllocBuffer.cpp@09d00c18e323

src/share/vm/memory/threadLocalAllocBuffer.cpp