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annotate src/share/vm/memory/threadLocalAllocBuffer.inline.hpp @ 21187:f74b9f898cf2
NodeLIRBuilder: move creation of jump from moveToPhi() to visitEndNode().
author | Josef Eisl <josef.eisl@jku.at> |
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date | Mon, 20 Apr 2015 11:56:21 +0200 |
parents | 78bbf4d43a14 |
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0 | 1 /* |
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2 * Copyright (c) 1999, 2014, Oracle and/or its affiliates. All rights reserved. |
0 | 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 | |
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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). | |
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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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_MEMORY_THREADLOCALALLOCBUFFER_INLINE_HPP |
26 #define SHARE_VM_MEMORY_THREADLOCALALLOCBUFFER_INLINE_HPP | |
27 | |
28 #include "gc_interface/collectedHeap.hpp" | |
29 #include "memory/threadLocalAllocBuffer.hpp" | |
30 #include "runtime/atomic.hpp" | |
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31 #include "runtime/thread.hpp" |
1972 | 32 #include "utilities/copy.hpp" |
33 | |
0 | 34 inline HeapWord* ThreadLocalAllocBuffer::allocate(size_t size) { |
35 invariants(); | |
36 HeapWord* obj = top(); | |
37 if (pointer_delta(end(), obj) >= size) { | |
38 // successful thread-local allocation | |
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39 #ifdef ASSERT |
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40 // Skip mangling the space corresponding to the object header to |
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41 // ensure that the returned space is not considered parsable by |
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42 // any concurrent GC thread. |
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43 size_t hdr_size = oopDesc::header_size(); |
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44 Copy::fill_to_words(obj + hdr_size, size - hdr_size, badHeapWordVal); |
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45 #endif // ASSERT |
0 | 46 // This addition is safe because we know that top is |
47 // at least size below end, so the add can't wrap. | |
48 set_top(obj + size); | |
49 | |
50 invariants(); | |
51 return obj; | |
52 } | |
53 return NULL; | |
54 } | |
55 | |
56 inline size_t ThreadLocalAllocBuffer::compute_size(size_t obj_size) { | |
57 const size_t aligned_obj_size = align_object_size(obj_size); | |
58 | |
59 // Compute the size for the new TLAB. | |
60 // The "last" tlab may be smaller to reduce fragmentation. | |
61 // unsafe_max_tlab_alloc is just a hint. | |
62 const size_t available_size = Universe::heap()->unsafe_max_tlab_alloc(myThread()) / | |
63 HeapWordSize; | |
64 size_t new_tlab_size = MIN2(available_size, desired_size() + aligned_obj_size); | |
65 | |
66 // Make sure there's enough room for object and filler int[]. | |
67 const size_t obj_plus_filler_size = aligned_obj_size + alignment_reserve(); | |
68 if (new_tlab_size < obj_plus_filler_size) { | |
69 // If there isn't enough room for the allocation, return failure. | |
70 if (PrintTLAB && Verbose) { | |
71 gclog_or_tty->print_cr("ThreadLocalAllocBuffer::compute_size(" SIZE_FORMAT ")" | |
72 " returns failure", | |
73 obj_size); | |
74 } | |
75 return 0; | |
76 } | |
77 if (PrintTLAB && Verbose) { | |
78 gclog_or_tty->print_cr("ThreadLocalAllocBuffer::compute_size(" SIZE_FORMAT ")" | |
79 " returns " SIZE_FORMAT, | |
80 obj_size, new_tlab_size); | |
81 } | |
82 return new_tlab_size; | |
83 } | |
84 | |
85 | |
86 void ThreadLocalAllocBuffer::record_slow_allocation(size_t obj_size) { | |
87 // Raise size required to bypass TLAB next time. Why? Else there's | |
88 // a risk that a thread that repeatedly allocates objects of one | |
89 // size will get stuck on this slow path. | |
90 | |
91 set_refill_waste_limit(refill_waste_limit() + refill_waste_limit_increment()); | |
92 | |
93 _slow_allocations++; | |
94 | |
95 if (PrintTLAB && Verbose) { | |
96 Thread* thrd = myThread(); | |
97 gclog_or_tty->print("TLAB: %s thread: "INTPTR_FORMAT" [id: %2d]" | |
98 " obj: "SIZE_FORMAT | |
99 " free: "SIZE_FORMAT | |
100 " waste: "SIZE_FORMAT"\n", | |
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101 "slow", p2i(thrd), thrd->osthread()->thread_id(), |
0 | 102 obj_size, free(), refill_waste_limit()); |
103 } | |
104 } | |
1972 | 105 |
106 #endif // SHARE_VM_MEMORY_THREADLOCALALLOCBUFFER_INLINE_HPP |