Mercurial > jdk8-mips64-public > hotspot / file comparison
comparison: src/share/vm/memory/threadLocalAllocBuffer.inline.hpp
src/share/vm/memory/threadLocalAllocBuffer.inline.hpp
- changeset 435
- a61af66fc99e
- child 1600
- 2dd52dea6d28
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| 1 /* | |
| 2 * Copyright 1999-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 inline HeapWord* ThreadLocalAllocBuffer::allocate(size_t size) { | |
| 26 invariants(); | |
| 27 HeapWord* obj = top(); | |
| 28 if (pointer_delta(end(), obj) >= size) { | |
| 29 // successful thread-local allocation | |
| 30 | |
| 31 DEBUG_ONLY(Copy::fill_to_words(obj, size, badHeapWordVal)); | |
| 32 // This addition is safe because we know that top is | |
| 33 // at least size below end, so the add can't wrap. | |
| 34 set_top(obj + size); | |
| 35 | |
| 36 invariants(); | |
| 37 return obj; | |
| 38 } | |
| 39 return NULL; | |
| 40 } | |
| 41 | |
| 42 inline size_t ThreadLocalAllocBuffer::compute_size(size_t obj_size) { | |
| 43 const size_t aligned_obj_size = align_object_size(obj_size); | |
| 44 | |
| 45 // Compute the size for the new TLAB. | |
| 46 // The "last" tlab may be smaller to reduce fragmentation. | |
| 47 // unsafe_max_tlab_alloc is just a hint. | |
| 48 const size_t available_size = Universe::heap()->unsafe_max_tlab_alloc(myThread()) / | |
| 49 HeapWordSize; | |
| 50 size_t new_tlab_size = MIN2(available_size, desired_size() + aligned_obj_size); | |
| 51 | |
| 52 // Make sure there's enough room for object and filler int[]. | |
| 53 const size_t obj_plus_filler_size = aligned_obj_size + alignment_reserve(); | |
| 54 if (new_tlab_size < obj_plus_filler_size) { | |
| 55 // If there isn't enough room for the allocation, return failure. | |
| 56 if (PrintTLAB && Verbose) { | |
| 57 gclog_or_tty->print_cr("ThreadLocalAllocBuffer::compute_size(" SIZE_FORMAT ")" | |
| 58 " returns failure", | |
| 59 obj_size); | |
| 60 } | |
| 61 return 0; | |
| 62 } | |
| 63 if (PrintTLAB && Verbose) { | |
| 64 gclog_or_tty->print_cr("ThreadLocalAllocBuffer::compute_size(" SIZE_FORMAT ")" | |
| 65 " returns " SIZE_FORMAT, | |
| 66 obj_size, new_tlab_size); | |
| 67 } | |
| 68 return new_tlab_size; | |
| 69 } | |
| 70 | |
| 71 | |
| 72 void ThreadLocalAllocBuffer::record_slow_allocation(size_t obj_size) { | |
| 73 // Raise size required to bypass TLAB next time. Why? Else there's | |
| 74 // a risk that a thread that repeatedly allocates objects of one | |
| 75 // size will get stuck on this slow path. | |
| 76 | |
| 77 set_refill_waste_limit(refill_waste_limit() + refill_waste_limit_increment()); | |
| 78 | |
| 79 _slow_allocations++; | |
| 80 | |
| 81 if (PrintTLAB && Verbose) { | |
| 82 Thread* thrd = myThread(); | |
| 83 gclog_or_tty->print("TLAB: %s thread: "INTPTR_FORMAT" [id: %2d]" | |
| 84 " obj: "SIZE_FORMAT | |
| 85 " free: "SIZE_FORMAT | |
| 86 " waste: "SIZE_FORMAT"\n", | |
| 87 "slow", thrd, thrd->osthread()->thread_id(), | |
| 88 obj_size, free(), refill_waste_limit()); | |
| 89 } | |
| 90 } |
