0
|
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 }
|