Tue, 30 Apr 2013 11:56:52 -0700
8011661: Insufficient memory message says "malloc" when sometimes it should say "mmap"
Reviewed-by: coleenp, zgu, hseigel
1 /*
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25 #include "precompiled.hpp"
26 #include "memory/allocation.hpp"
27 #include "memory/metachunk.hpp"
28 #include "utilities/copy.hpp"
29 #include "utilities/debug.hpp"
31 //
32 // Future modification
33 //
34 // The Metachunk can conceivable be replaced by the Chunk in
35 // allocation.hpp. Note that the latter Chunk is the space for
36 // allocation (allocations from the chunk are out of the space in
37 // the Chunk after the header for the Chunk) where as Metachunks
38 // point to space in a VirtualSpace. To replace Metachunks with
39 // Chunks, change Chunks so that they can be allocated out of a VirtualSpace.
41 const size_t metadata_chunk_initialize = 0xf7f7f7f7;
43 size_t Metachunk::_overhead =
44 Chunk::aligned_overhead_size(sizeof(Metachunk)) / BytesPerWord;
46 // Metachunk methods
48 Metachunk* Metachunk::initialize(MetaWord* ptr, size_t word_size) {
49 // Set bottom, top, and end. Allow space for the Metachunk itself
50 Metachunk* chunk = (Metachunk*) ptr;
52 MetaWord* chunk_bottom = ptr + _overhead;
53 chunk->set_bottom(ptr);
54 chunk->set_top(chunk_bottom);
55 MetaWord* chunk_end = ptr + word_size;
56 assert(chunk_end > chunk_bottom, "Chunk must be too small");
57 chunk->set_end(chunk_end);
58 chunk->set_next(NULL);
59 chunk->set_prev(NULL);
60 chunk->set_word_size(word_size);
61 #ifdef ASSERT
62 size_t data_word_size = pointer_delta(chunk_end, chunk_bottom, sizeof(MetaWord));
63 Copy::fill_to_words((HeapWord*) chunk_bottom, data_word_size, metadata_chunk_initialize);
64 #endif
65 return chunk;
66 }
69 MetaWord* Metachunk::allocate(size_t word_size) {
70 MetaWord* result = NULL;
71 // If available, bump the pointer to allocate.
72 if (free_word_size() >= word_size) {
73 result = _top;
74 _top = _top + word_size;
75 }
76 return result;
77 }
79 // _bottom points to the start of the chunk including the overhead.
80 size_t Metachunk::used_word_size() const {
81 return pointer_delta(_top, _bottom, sizeof(MetaWord));
82 }
84 size_t Metachunk::free_word_size() const {
85 return pointer_delta(_end, _top, sizeof(MetaWord));
86 }
88 size_t Metachunk::capacity_word_size() const {
89 return pointer_delta(_end, _bottom, sizeof(MetaWord));
90 }
92 void Metachunk::print_on(outputStream* st) const {
93 st->print_cr("Metachunk:"
94 " bottom " PTR_FORMAT " top " PTR_FORMAT
95 " end " PTR_FORMAT " size " SIZE_FORMAT,
96 bottom(), top(), end(), word_size());
97 if (Verbose) {
98 st->print_cr(" used " SIZE_FORMAT " free " SIZE_FORMAT,
99 used_word_size(), free_word_size());
100 }
101 }
103 #ifndef PRODUCT
104 void Metachunk::mangle() {
105 // Mangle the payload of the chunk and not the links that
106 // maintain list of chunks.
107 HeapWord* start = (HeapWord*)(bottom() + overhead());
108 size_t word_size = capacity_word_size() - overhead();
109 Copy::fill_to_words(start, word_size, metadata_chunk_initialize);
110 }
111 #endif // PRODUCT
113 void Metachunk::verify() {
114 #ifdef ASSERT
115 // Cannot walk through the blocks unless the blocks have
116 // headers with sizes.
117 assert(_bottom <= _top &&
118 _top <= _end,
119 "Chunk has been smashed");
120 #endif
121 return;
122 }