Mercurial > hg > truffle
annotate src/share/vm/memory/threadLocalAllocBuffer.inline.hpp @ 20543:e7d0505c8a30
8059758: Footprint regressions with JDK-8038423
Summary: Changes in JDK-8038423 always initialize (zero out) virtual memory used for auxiliary data structures. This causes a footprint regression for G1 in startup benchmarks. This is because they do not touch that memory at all, so the operating system does not actually commit these pages. The fix is to, if the initialization value of the data structures matches the default value of just committed memory (=0), do not do anything.
Reviewed-by: jwilhelm, brutisso
| author | tschatzl |
|---|---|
| date | Fri, 10 Oct 2014 15:51:58 +0200 |
| parents | 78bbf4d43a14 |
| children |
| rev | line source |
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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 | |
| 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 * | |
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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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78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
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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 |