Mercurial > hg > graal-jvmci-8
annotate src/share/vm/memory/threadLocalAllocBuffer.inline.hpp @ 1994:6cd6d394f280
7001033: assert(gch->gc_cause() == GCCause::_scavenge_alot || !gch->incremental_collection_failed())
7002546: regression on SpecJbb2005 on 7b118 comparing to 7b117 on small heaps
Summary: Relaxed assertion checking related to incremental_collection_failed flag to allow for ExplicitGCInvokesConcurrent behaviour where we do not want a failing scavenge to bail to a stop-world collection. Parameterized incremental_collection_will_fail() so we can selectively use, or not use, as appropriate, the statistical prediction at specific use sites. This essentially reverts the scavenge bail-out logic to what it was prior to some recent changes that had inadvertently started using the statistical prediction which can be noisy in the presence of bursty loads. Added some associated verbose non-product debugging messages.
Reviewed-by: johnc, tonyp
| author | ysr |
|---|---|
| date | Tue, 07 Dec 2010 21:55:53 -0800 |
| parents | f95d63e2154a |
| children | c760f78e0a53 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1972 | 2 * Copyright (c) 1999, 2010, 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" | |
| 31 #include "utilities/copy.hpp" | |
| 32 | |
| 0 | 33 inline HeapWord* ThreadLocalAllocBuffer::allocate(size_t size) { |
| 34 invariants(); | |
| 35 HeapWord* obj = top(); | |
| 36 if (pointer_delta(end(), obj) >= size) { | |
| 37 // successful thread-local allocation | |
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38 #ifdef ASSERT |
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39 // Skip mangling the space corresponding to the object header to |
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40 // ensure that the returned space is not considered parsable by |
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41 // any concurrent GC thread. |
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6916623: Align object to 16 bytes to use Compressed Oops with java heap up to 64Gb
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42 size_t hdr_size = oopDesc::header_size(); |
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43 Copy::fill_to_words(obj + hdr_size, size - hdr_size, badHeapWordVal); |
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44 #endif // ASSERT |
| 0 | 45 // This addition is safe because we know that top is |
| 46 // at least size below end, so the add can't wrap. | |
| 47 set_top(obj + size); | |
| 48 | |
| 49 invariants(); | |
| 50 return obj; | |
| 51 } | |
| 52 return NULL; | |
| 53 } | |
| 54 | |
| 55 inline size_t ThreadLocalAllocBuffer::compute_size(size_t obj_size) { | |
| 56 const size_t aligned_obj_size = align_object_size(obj_size); | |
| 57 | |
| 58 // Compute the size for the new TLAB. | |
| 59 // The "last" tlab may be smaller to reduce fragmentation. | |
| 60 // unsafe_max_tlab_alloc is just a hint. | |
| 61 const size_t available_size = Universe::heap()->unsafe_max_tlab_alloc(myThread()) / | |
| 62 HeapWordSize; | |
| 63 size_t new_tlab_size = MIN2(available_size, desired_size() + aligned_obj_size); | |
| 64 | |
| 65 // Make sure there's enough room for object and filler int[]. | |
| 66 const size_t obj_plus_filler_size = aligned_obj_size + alignment_reserve(); | |
| 67 if (new_tlab_size < obj_plus_filler_size) { | |
| 68 // If there isn't enough room for the allocation, return failure. | |
| 69 if (PrintTLAB && Verbose) { | |
| 70 gclog_or_tty->print_cr("ThreadLocalAllocBuffer::compute_size(" SIZE_FORMAT ")" | |
| 71 " returns failure", | |
| 72 obj_size); | |
| 73 } | |
| 74 return 0; | |
| 75 } | |
| 76 if (PrintTLAB && Verbose) { | |
| 77 gclog_or_tty->print_cr("ThreadLocalAllocBuffer::compute_size(" SIZE_FORMAT ")" | |
| 78 " returns " SIZE_FORMAT, | |
| 79 obj_size, new_tlab_size); | |
| 80 } | |
| 81 return new_tlab_size; | |
| 82 } | |
| 83 | |
| 84 | |
| 85 void ThreadLocalAllocBuffer::record_slow_allocation(size_t obj_size) { | |
| 86 // Raise size required to bypass TLAB next time. Why? Else there's | |
| 87 // a risk that a thread that repeatedly allocates objects of one | |
| 88 // size will get stuck on this slow path. | |
| 89 | |
| 90 set_refill_waste_limit(refill_waste_limit() + refill_waste_limit_increment()); | |
| 91 | |
| 92 _slow_allocations++; | |
| 93 | |
| 94 if (PrintTLAB && Verbose) { | |
| 95 Thread* thrd = myThread(); | |
| 96 gclog_or_tty->print("TLAB: %s thread: "INTPTR_FORMAT" [id: %2d]" | |
| 97 " obj: "SIZE_FORMAT | |
| 98 " free: "SIZE_FORMAT | |
| 99 " waste: "SIZE_FORMAT"\n", | |
| 100 "slow", thrd, thrd->osthread()->thread_id(), | |
| 101 obj_size, free(), refill_waste_limit()); | |
| 102 } | |
| 103 } | |
| 1972 | 104 |
| 105 #endif // SHARE_VM_MEMORY_THREADLOCALALLOCBUFFER_INLINE_HPP |