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8011268: NPG: Free unused VirtualSpaceNodes

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Reviewed-by: mgerdin, coleenp, johnc
This commit is contained in:
Jon Masamitsu 2013-03-01 10:19:29 -08:00
parent 687b6a8d44
commit e1cbb28f3f
5 changed files with 233 additions and 52 deletions
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38
hotspot/src/share/vm/memory/metachunk.cpp
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@ -28,6 +28,7 @@
#include "utilities/copy.hpp"
#include "utilities/debug.hpp"
class VirtualSpaceNode;
//
// Future modification
//
@ -45,27 +46,30 @@ size_t Metachunk::_overhead =
// Metachunk methods
Metachunk* Metachunk::initialize(MetaWord* ptr, size_t word_size) {
// Set bottom, top, and end. Allow space for the Metachunk itself
Metachunk* chunk = (Metachunk*) ptr;
MetaWord* chunk_bottom = ptr + _overhead;
chunk->set_bottom(ptr);
chunk->set_top(chunk_bottom);
MetaWord* chunk_end = ptr + word_size;
assert(chunk_end > chunk_bottom, "Chunk must be too small");
chunk->set_end(chunk_end);
chunk->set_next(NULL);
chunk->set_prev(NULL);
chunk->set_word_size(word_size);
Metachunk::Metachunk(size_t word_size,
VirtualSpaceNode* container) :
_word_size(word_size),
_bottom(NULL),
_end(NULL),
_top(NULL),
_next(NULL),
_prev(NULL),
_container(container)
{
_bottom = (MetaWord*)this;
_top = (MetaWord*)this + _overhead;
_end = (MetaWord*)this + word_size;
#ifdef ASSERT
size_t data_word_size = pointer_delta(chunk_end, chunk_bottom, sizeof(MetaWord));
Copy::fill_to_words((HeapWord*) chunk_bottom, data_word_size, metadata_chunk_initialize);
set_is_free(false);
size_t data_word_size = pointer_delta(end(),
top(),
sizeof(MetaWord));
Copy::fill_to_words((HeapWord*) top(),
data_word_size,
metadata_chunk_initialize);
#endif
return chunk;
}
MetaWord* Metachunk::allocate(size_t word_size) {
MetaWord* result = NULL;
// If available, bump the pointer to allocate.