truffle: src/share/vm/memory/metachunk.cpp annotate

annotate src/share/vm/memory/metachunk.cpp @ 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
7208 eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	1 /*
17937 78bbf4d43a14 8037816: Fix for 8036122 breaks build with Xcode5/clang drchase parents: 12903 diff changeset	2 * Copyright (c) 2012, 2014, Oracle and/or its affiliates. All rights reserved.
7208 eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	4 *
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	5 * This code is free software; you can redistribute it and/or modify it
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	6 * under the terms of the GNU General Public License version 2 only, as
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	7 * published by the Free Software Foundation.
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	8 *
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	9 * This code is distributed in the hope that it will be useful, but WITHOUT
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	12 * version 2 for more details (a copy is included in the LICENSE file that
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	13 * accompanied this code).
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	14 *
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	15 * You should have received a copy of the GNU General Public License version
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	16 * 2 along with this work; if not, write to the Free Software Foundation,
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	18 *
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	20 * or visit www.oracle.com if you need additional information or have any
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	21 * questions.
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	22 *
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	23 */
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	24
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	25 #include "precompiled.hpp"
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	26 #include "memory/allocation.hpp"
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	27 #include "memory/metachunk.hpp"
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	28 #include "utilities/copy.hpp"
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	29 #include "utilities/debug.hpp"
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	30
17937 78bbf4d43a14 8037816: Fix for 8036122 breaks build with Xcode5/clang drchase parents: 12903 diff changeset	31 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
78bbf4d43a14 8037816: Fix for 8036122 breaks build with Xcode5/clang drchase parents: 12903 diff changeset	32
10175 c23dbf0e8ab7 8011268: NPG: Free unused VirtualSpaceNodes jmasa parents: 7446 diff changeset	33 class VirtualSpaceNode;
7208 eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	34
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	35 const size_t metadata_chunk_initialize = 0xf7f7f7f7;
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	36
12902 bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	37 size_t Metachunk::object_alignment() {
12903 ec2e26e26183 8026392: Metachunks and Metablocks are using a too large alignment stefank parents: 12902 diff changeset	38 // Must align pointers and sizes to 8,
ec2e26e26183 8026392: Metachunks and Metablocks are using a too large alignment stefank parents: 12902 diff changeset	39 // so that 64 bit types get correctly aligned.
ec2e26e26183 8026392: Metachunks and Metablocks are using a too large alignment stefank parents: 12902 diff changeset	40 const size_t alignment = 8;
ec2e26e26183 8026392: Metachunks and Metablocks are using a too large alignment stefank parents: 12902 diff changeset	41
ec2e26e26183 8026392: Metachunks and Metablocks are using a too large alignment stefank parents: 12902 diff changeset	42 // Make sure that the Klass alignment also agree.
ec2e26e26183 8026392: Metachunks and Metablocks are using a too large alignment stefank parents: 12902 diff changeset	43 STATIC_ASSERT(alignment == (size_t)KlassAlignmentInBytes);
ec2e26e26183 8026392: Metachunks and Metablocks are using a too large alignment stefank parents: 12902 diff changeset	44
ec2e26e26183 8026392: Metachunks and Metablocks are using a too large alignment stefank parents: 12902 diff changeset	45 return alignment;
12902 bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	46 }
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	47
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	48 size_t Metachunk::overhead() {
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	49 return align_size_up(sizeof(Metachunk), object_alignment()) / BytesPerWord;
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	50 }
7208 eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	51
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	52 // Metachunk methods
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	53
10175 c23dbf0e8ab7 8011268: NPG: Free unused VirtualSpaceNodes jmasa parents: 7446 diff changeset	54 Metachunk::Metachunk(size_t word_size,
12902 bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	55 VirtualSpaceNode* container)
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	56 : Metabase<Metachunk>(word_size),
10175 c23dbf0e8ab7 8011268: NPG: Free unused VirtualSpaceNodes jmasa parents: 7446 diff changeset	57 _top(NULL),
c23dbf0e8ab7 8011268: NPG: Free unused VirtualSpaceNodes jmasa parents: 7446 diff changeset	58 _container(container)
c23dbf0e8ab7 8011268: NPG: Free unused VirtualSpaceNodes jmasa parents: 7446 diff changeset	59 {
12902 bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	60 _top = initial_top();
7208 eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	61 #ifdef ASSERT
12902 bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	62 set_is_tagged_free(false);
10175 c23dbf0e8ab7 8011268: NPG: Free unused VirtualSpaceNodes jmasa parents: 7446 diff changeset	63 size_t data_word_size = pointer_delta(end(),
12902 bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	64 _top,
10175 c23dbf0e8ab7 8011268: NPG: Free unused VirtualSpaceNodes jmasa parents: 7446 diff changeset	65 sizeof(MetaWord));
12902 bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	66 Copy::fill_to_words((HeapWord*)_top,
10175 c23dbf0e8ab7 8011268: NPG: Free unused VirtualSpaceNodes jmasa parents: 7446 diff changeset	67 data_word_size,
c23dbf0e8ab7 8011268: NPG: Free unused VirtualSpaceNodes jmasa parents: 7446 diff changeset	68 metadata_chunk_initialize);
7208 eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	69 #endif
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	70 }
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	71
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	72 MetaWord* Metachunk::allocate(size_t word_size) {
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	73 MetaWord* result = NULL;
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	74 // If available, bump the pointer to allocate.
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	75 if (free_word_size() >= word_size) {
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	76 result = _top;
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	77 _top = _top + word_size;
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	78 }
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	79 return result;
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	80 }
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	81
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	82 // _bottom points to the start of the chunk including the overhead.
7446 e51c9860cf66 8005082: NPG: Add specialized Metachunk sizes for reflection and anonymous classloaders jmasa parents: 7208 diff changeset	83 size_t Metachunk::used_word_size() const {
12902 bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	84 return pointer_delta(_top, bottom(), sizeof(MetaWord));
7208 eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	85 }
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	86
7446 e51c9860cf66 8005082: NPG: Add specialized Metachunk sizes for reflection and anonymous classloaders jmasa parents: 7208 diff changeset	87 size_t Metachunk::free_word_size() const {
12902 bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	88 return pointer_delta(end(), _top, sizeof(MetaWord));
7208 eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	89 }
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	90
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	91 void Metachunk::print_on(outputStream* st) const {
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	92 st->print_cr("Metachunk:"
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	93 " bottom " PTR_FORMAT " top " PTR_FORMAT
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	94 " end " PTR_FORMAT " size " SIZE_FORMAT,
12902 bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	95 bottom(), _top, end(), word_size());
7446 e51c9860cf66 8005082: NPG: Add specialized Metachunk sizes for reflection and anonymous classloaders jmasa parents: 7208 diff changeset	96 if (Verbose) {
e51c9860cf66 8005082: NPG: Add specialized Metachunk sizes for reflection and anonymous classloaders jmasa parents: 7208 diff changeset	97 st->print_cr(" used " SIZE_FORMAT " free " SIZE_FORMAT,
e51c9860cf66 8005082: NPG: Add specialized Metachunk sizes for reflection and anonymous classloaders jmasa parents: 7208 diff changeset	98 used_word_size(), free_word_size());
e51c9860cf66 8005082: NPG: Add specialized Metachunk sizes for reflection and anonymous classloaders jmasa parents: 7208 diff changeset	99 }
7208 eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	100 }
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	101
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	102 #ifndef PRODUCT
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	103 void Metachunk::mangle() {
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	104 // Mangle the payload of the chunk and not the links that
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	105 // maintain list of chunks.
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	106 HeapWord* start = (HeapWord*)(bottom() + overhead());
12902 bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	107 size_t size = word_size() - overhead();
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	108 Copy::fill_to_words(start, size, metadata_chunk_initialize);
7208 eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	109 }
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	110 #endif // PRODUCT
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	111
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	112 void Metachunk::verify() {
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	113 #ifdef ASSERT
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	114 // Cannot walk through the blocks unless the blocks have
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	115 // headers with sizes.
12902 bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	116 assert(bottom() <= _top &&
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	117 _top <= (MetaWord*)end(),
7208 eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	118 "Chunk has been smashed");
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	119 #endif
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	120 return;
eade6b2e4782 8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp jmasa parents: diff changeset	121 }
12902 bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	122
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	123 /////////////// Unit tests ///////////////
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	124
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	125 #ifndef PRODUCT
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	126
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	127 class TestMetachunk {
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	128 public:
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	129 static void test() {
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	130 size_t size = 2 * 1024 * 1024;
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	131 void* memory = malloc(size);
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	132 assert(memory != NULL, "Failed to malloc 2MB");
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	133
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	134 Metachunk* metachunk = ::new (memory) Metachunk(size / BytesPerWord, NULL);
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	135
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	136 assert(metachunk->bottom() == (MetaWord*)metachunk, "assert");
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	137 assert(metachunk->end() == (uintptr_t*)metachunk + metachunk->size(), "assert");
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	138
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	139 // Check sizes
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	140 assert(metachunk->size() == metachunk->word_size(), "assert");
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	141 assert(metachunk->word_size() == pointer_delta(metachunk->end(), metachunk->bottom(),
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	142 sizeof(MetaWord*)), "assert");
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	143
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	144 // Check usage
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	145 assert(metachunk->used_word_size() == metachunk->overhead(), "assert");
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	146 assert(metachunk->free_word_size() == metachunk->word_size() - metachunk->used_word_size(), "assert");
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	147 assert(metachunk->top() == metachunk->initial_top(), "assert");
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	148 assert(metachunk->is_empty(), "assert");
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	149
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	150 // Allocate
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	151 size_t alloc_size = 64; // Words
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	152 assert(is_size_aligned(alloc_size, Metachunk::object_alignment()), "assert");
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	153
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	154 MetaWord* mem = metachunk->allocate(alloc_size);
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	155
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	156 // Check post alloc
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	157 assert(mem == metachunk->initial_top(), "assert");
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	158 assert(mem + alloc_size == metachunk->top(), "assert");
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	159 assert(metachunk->used_word_size() == metachunk->overhead() + alloc_size, "assert");
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	160 assert(metachunk->free_word_size() == metachunk->word_size() - metachunk->used_word_size(), "assert");
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	161 assert(!metachunk->is_empty(), "assert");
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	162
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	163 // Clear chunk
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	164 metachunk->reset_empty();
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	165
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	166 // Check post clear
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	167 assert(metachunk->used_word_size() == metachunk->overhead(), "assert");
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	168 assert(metachunk->free_word_size() == metachunk->word_size() - metachunk->used_word_size(), "assert");
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	169 assert(metachunk->top() == metachunk->initial_top(), "assert");
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	170 assert(metachunk->is_empty(), "assert");
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	171
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	172 free(memory);
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	173 }
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	174 };
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	175
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	176 void TestMetachunk_test() {
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	177 TestMetachunk::test();
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	178 }
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	179
bdfbb1fb19ca 8026391: The Metachunk header wastes memory stefank parents: 10175 diff changeset	180 #endif

Mercurial > hg > truffle

annotate src/share/vm/memory/metachunk.cpp @ 20543:e7d0505c8a30