duke@435: /*
duke@435:  * Copyright 1999-2007 Sun Microsystems, Inc.  All Rights Reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
duke@435:  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435:  * CA 95054 USA or visit www.sun.com if you need additional information or
duke@435:  * have any questions.
duke@435:  *
duke@435:  */
duke@435: 
duke@435: inline HeapWord* ThreadLocalAllocBuffer::allocate(size_t size) {
duke@435:   invariants();
duke@435:   HeapWord* obj = top();
duke@435:   if (pointer_delta(end(), obj) >= size) {
duke@435:     // successful thread-local allocation
duke@435: 
duke@435:     DEBUG_ONLY(Copy::fill_to_words(obj, size, badHeapWordVal));
duke@435:     // This addition is safe because we know that top is
duke@435:     // at least size below end, so the add can't wrap.
duke@435:     set_top(obj + size);
duke@435: 
duke@435:     invariants();
duke@435:     return obj;
duke@435:   }
duke@435:   return NULL;
duke@435: }
duke@435: 
duke@435: inline size_t ThreadLocalAllocBuffer::compute_size(size_t obj_size) {
duke@435:   const size_t aligned_obj_size = align_object_size(obj_size);
duke@435: 
duke@435:   // Compute the size for the new TLAB.
duke@435:   // The "last" tlab may be smaller to reduce fragmentation.
duke@435:   // unsafe_max_tlab_alloc is just a hint.
duke@435:   const size_t available_size = Universe::heap()->unsafe_max_tlab_alloc(myThread()) /
duke@435:                                                   HeapWordSize;
duke@435:   size_t new_tlab_size = MIN2(available_size, desired_size() + aligned_obj_size);
duke@435: 
duke@435:   // Make sure there's enough room for object and filler int[].
duke@435:   const size_t obj_plus_filler_size = aligned_obj_size + alignment_reserve();
duke@435:   if (new_tlab_size < obj_plus_filler_size) {
duke@435:     // If there isn't enough room for the allocation, return failure.
duke@435:     if (PrintTLAB && Verbose) {
duke@435:       gclog_or_tty->print_cr("ThreadLocalAllocBuffer::compute_size(" SIZE_FORMAT ")"
duke@435:                     " returns failure",
duke@435:                     obj_size);
duke@435:     }
duke@435:     return 0;
duke@435:   }
duke@435:   if (PrintTLAB && Verbose) {
duke@435:     gclog_or_tty->print_cr("ThreadLocalAllocBuffer::compute_size(" SIZE_FORMAT ")"
duke@435:                   " returns " SIZE_FORMAT,
duke@435:                   obj_size, new_tlab_size);
duke@435:   }
duke@435:   return new_tlab_size;
duke@435: }
duke@435: 
duke@435: 
duke@435: void ThreadLocalAllocBuffer::record_slow_allocation(size_t obj_size) {
duke@435:   // Raise size required to bypass TLAB next time. Why? Else there's
duke@435:   // a risk that a thread that repeatedly allocates objects of one
duke@435:   // size will get stuck on this slow path.
duke@435: 
duke@435:   set_refill_waste_limit(refill_waste_limit() + refill_waste_limit_increment());
duke@435: 
duke@435:   _slow_allocations++;
duke@435: 
duke@435:   if (PrintTLAB && Verbose) {
duke@435:     Thread* thrd = myThread();
duke@435:     gclog_or_tty->print("TLAB: %s thread: "INTPTR_FORMAT" [id: %2d]"
duke@435:                         " obj: "SIZE_FORMAT
duke@435:                         " free: "SIZE_FORMAT
duke@435:                         " waste: "SIZE_FORMAT"\n",
duke@435:                         "slow", thrd, thrd->osthread()->thread_id(),
duke@435:                         obj_size, free(), refill_waste_limit());
duke@435:   }
duke@435: }