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 /*

  * Copyright (c) 1999, 2010, 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

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  */

 #ifndef SHARE_VM_MEMORY_THREADLOCALALLOCBUFFER_INLINE_HPP

 #define SHARE_VM_MEMORY_THREADLOCALALLOCBUFFER_INLINE_HPP

 #include "gc_interface/collectedHeap.hpp"

 #include "memory/threadLocalAllocBuffer.hpp"

 #include "runtime/atomic.hpp"

 #include "runtime/thread.hpp"

 #include "utilities/copy.hpp"

 inline HeapWord* ThreadLocalAllocBuffer::allocate(size_t size) {

   invariants();

   HeapWord* obj = top();

   if (pointer_delta(end(), obj) >= size) {

     // successful thread-local allocation

 #ifdef ASSERT

     // Skip mangling the space corresponding to the object header to

     // ensure that the returned space is not considered parsable by

     // any concurrent GC thread.

     size_t hdr_size = oopDesc::header_size();

     Copy::fill_to_words(obj + hdr_size, size - hdr_size, badHeapWordVal);

 #endif // ASSERT

     // This addition is safe because we know that top is

     // at least size below end, so the add can't wrap.

     set_top(obj + size);

     invariants();

     return obj;

   }

   return NULL;

 }

 inline size_t ThreadLocalAllocBuffer::compute_size(size_t obj_size) {

   const size_t aligned_obj_size = align_object_size(obj_size);

   // Compute the size for the new TLAB.

   // The "last" tlab may be smaller to reduce fragmentation.

   // unsafe_max_tlab_alloc is just a hint.

   const size_t available_size = Universe::heap()->unsafe_max_tlab_alloc(myThread()) /

                                                   HeapWordSize;

   size_t new_tlab_size = MIN2(available_size, desired_size() + aligned_obj_size);

   // Make sure there's enough room for object and filler int[].

   const size_t obj_plus_filler_size = aligned_obj_size + alignment_reserve();

   if (new_tlab_size < obj_plus_filler_size) {

     // If there isn't enough room for the allocation, return failure.

     if (PrintTLAB && Verbose) {

       gclog_or_tty->print_cr("ThreadLocalAllocBuffer::compute_size(" SIZE_FORMAT ")"

                     " returns failure",

                     obj_size);

     }

     return 0;

   }

   if (PrintTLAB && Verbose) {

     gclog_or_tty->print_cr("ThreadLocalAllocBuffer::compute_size(" SIZE_FORMAT ")"

                   " returns " SIZE_FORMAT,

                   obj_size, new_tlab_size);

   }

   return new_tlab_size;

 }

 void ThreadLocalAllocBuffer::record_slow_allocation(size_t obj_size) {

   // Raise size required to bypass TLAB next time. Why? Else there's

   // a risk that a thread that repeatedly allocates objects of one

   // size will get stuck on this slow path.

   set_refill_waste_limit(refill_waste_limit() + refill_waste_limit_increment());

   _slow_allocations++;

   if (PrintTLAB && Verbose) {

     Thread* thrd = myThread();

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

                         " obj: "SIZE_FORMAT

                         " free: "SIZE_FORMAT

                         " waste: "SIZE_FORMAT"\n",

                         "slow", thrd, thrd->osthread()->thread_id(),

                         obj_size, free(), refill_waste_limit());

   }

 }

 #endif // SHARE_VM_MEMORY_THREADLOCALALLOCBUFFER_INLINE_HPP