| /* |
| * Copyright (c) 1999, 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_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", p2i(thrd), thrd->osthread()->thread_id(), |
| obj_size, free(), refill_waste_limit()); |
| } |
| } |
| |
| #endif // SHARE_VM_MEMORY_THREADLOCALALLOCBUFFER_INLINE_HPP |