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src/hotspot/share/memory/metaspace/metachunk.cpp
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rev 57511 : [mq]: metaspace-improvement
*** 20,172 ****
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
#include "precompiled.hpp"
! #include "memory/allocation.hpp"
#include "memory/metaspace/metachunk.hpp"
! #include "memory/metaspace/occupancyMap.hpp"
#include "memory/metaspace/virtualSpaceNode.hpp"
#include "utilities/align.hpp"
#include "utilities/copy.hpp"
#include "utilities/debug.hpp"
namespace metaspace {
! size_t Metachunk::object_alignment() {
! // Must align pointers and sizes to 8,
! // so that 64 bit types get correctly aligned.
! const size_t alignment = 8;
!
! // Make sure that the Klass alignment also agree.
! STATIC_ASSERT(alignment == (size_t)KlassAlignmentInBytes);
!
! return alignment;
! }
!
! size_t Metachunk::overhead() {
! return align_up(sizeof(Metachunk), object_alignment()) / BytesPerWord;
! }
!
! // Metachunk methods
!
! Metachunk::Metachunk(ChunkIndex chunktype, bool is_class, size_t word_size,
! VirtualSpaceNode* container)
! : Metabase<Metachunk>(word_size),
! _container(container),
! _top(NULL),
! _sentinel(CHUNK_SENTINEL),
! _chunk_type(chunktype),
! _is_class(is_class),
! _origin(origin_normal),
! _use_count(0)
! {
! _top = initial_top();
! set_is_tagged_free(false);
! #ifdef ASSERT
! mangle(uninitMetaWordVal);
! verify();
! #endif
! }
! MetaWord* Metachunk::allocate(size_t word_size) {
! MetaWord* result = NULL;
! // If available, bump the pointer to allocate.
! if (free_word_size() >= word_size) {
! result = _top;
! _top = _top + word_size;
}
! return result;
}
! // _bottom points to the start of the chunk including the overhead.
! size_t Metachunk::used_word_size() const {
! return pointer_delta(_top, bottom(), sizeof(MetaWord));
! }
- size_t Metachunk::free_word_size() const {
- return pointer_delta(end(), _top, sizeof(MetaWord));
}
! void Metachunk::print_on(outputStream* st) const {
! st->print_cr("Metachunk:"
! " bottom " PTR_FORMAT " top " PTR_FORMAT
! " end " PTR_FORMAT " size " SIZE_FORMAT " (%s)",
! p2i(bottom()), p2i(_top), p2i(end()), word_size(),
! chunk_size_name(get_chunk_type()));
! if (Verbose) {
! st->print_cr(" used " SIZE_FORMAT " free " SIZE_FORMAT,
! used_word_size(), free_word_size());
}
}
#ifdef ASSERT
- void Metachunk::mangle(juint word_value) {
- // Overwrite the payload of the chunk and not the links that
- // maintain list of chunks.
- HeapWord* start = (HeapWord*)initial_top();
- size_t size = word_size() - overhead();
- Copy::fill_to_words(start, size, word_value);
- }
-
- void Metachunk::verify() const {
- assert(is_valid_sentinel(), "Chunk " PTR_FORMAT ": sentinel invalid", p2i(this));
- const ChunkIndex chunk_type = get_chunk_type();
- assert(is_valid_chunktype(chunk_type), "Chunk " PTR_FORMAT ": Invalid chunk type.", p2i(this));
- if (chunk_type != HumongousIndex) {
- assert(word_size() == get_size_for_nonhumongous_chunktype(chunk_type, is_class()),
- "Chunk " PTR_FORMAT ": wordsize " SIZE_FORMAT " does not fit chunk type %s.",
- p2i(this), word_size(), chunk_size_name(chunk_type));
- }
- assert(is_valid_chunkorigin(get_origin()), "Chunk " PTR_FORMAT ": Invalid chunk origin.", p2i(this));
- assert(bottom() <= _top && _top <= (MetaWord*)end(),
- "Chunk " PTR_FORMAT ": Chunk top out of chunk bounds.", p2i(this));
-
- // For non-humongous chunks, starting address shall be aligned
- // to its chunk size. Humongous chunks start address is
- // aligned to specialized chunk size.
- const size_t required_alignment =
- (chunk_type != HumongousIndex ? word_size() : get_size_for_nonhumongous_chunktype(SpecializedIndex, is_class())) * sizeof(MetaWord);
- assert(is_aligned((address)this, required_alignment),
- "Chunk " PTR_FORMAT ": (size " SIZE_FORMAT ") not aligned to " SIZE_FORMAT ".",
- p2i(this), word_size() * sizeof(MetaWord), required_alignment);
- }
#endif // ASSERT
! // Helper, returns a descriptive name for the given index.
! const char* chunk_size_name(ChunkIndex index) {
! switch (index) {
! case SpecializedIndex:
! return "specialized";
! case SmallIndex:
! return "small";
! case MediumIndex:
! return "medium";
! case HumongousIndex:
! return "humongous";
! default:
! return "Invalid index";
}
}
! #ifdef ASSERT
! void do_verify_chunk(Metachunk* chunk) {
! guarantee(chunk != NULL, "Sanity");
! // Verify chunk itself; then verify that it is consistent with the
! // occupany map of its containing node.
! chunk->verify();
! VirtualSpaceNode* const vsn = chunk->container();
! OccupancyMap* const ocmap = vsn->occupancy_map();
! ocmap->verify_for_chunk(chunk);
! }
! #endif
!
! void do_update_in_use_info_for_chunk(Metachunk* chunk, bool inuse) {
! chunk->set_is_tagged_free(!inuse);
! OccupancyMap* const ocmap = chunk->container()->occupancy_map();
! ocmap->set_region_in_use((MetaWord*)chunk, chunk->word_size(), inuse);
}
} // namespace metaspace
--- 20,169 ----
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
+
#include "precompiled.hpp"
!
! #include "memory/metaspace/chunkLevel.hpp"
! #include "memory/metaspace/constants.hpp"
#include "memory/metaspace/metachunk.hpp"
! #include "memory/metaspace/metaspaceCommon.hpp"
#include "memory/metaspace/virtualSpaceNode.hpp"
+
#include "utilities/align.hpp"
#include "utilities/copy.hpp"
#include "utilities/debug.hpp"
namespace metaspace {
! // Make sure that the Klass alignment also agree.
! STATIC_ASSERT(Metachunk::allocation_alignment_bytes == (size_t)KlassAlignmentInBytes);
! void Metachunk::remove_from_list() {
! if (_prev != NULL) {
! _prev->set_next(_next);
! }
! if (_next != NULL) {
! _next->set_prev(_prev);
}
! _prev = _next = NULL;
}
! // Ensure that chunk is committed up to at least word_size words.
! bool Metachunk::ensure_committed(size_t new_committed_words) {
!
! assert(new_committed_words <= word_size(), "too much.");
!
! if (new_committed_words <= committed_words()) {
! return true;
! }
!
! // Note: we may commit more than the area of our own chunk and that is okay.
! MetaWord* const commit_top = align_down(base() + committed_words(), constants::commit_granule_words);
! MetaWord* const new_commit_top = align_up(base() + new_committed_words, constants::commit_granule_words);
!
! {
! // Expand lock from here on.
! MutexLocker cl(MetaspaceExpand_lock, Mutex::_no_safepoint_check_flag);
! if (!_vsnode->ensure_range_is_committed(commit_top, new_commit_top - commit_top)) {
! return false;
! }
! // Remember how far we have committed.
! _committed_words = new_commit_top - base();
! if (_committed_words > word_size()) {
! _committed_words = word_size();
! }
! }
!
! return true;
}
!
! // Allocate word_size words from this chunk.
! //
! // May cause memory to be committed. That may fail if we hit a commit limit. In that case,
! // NULL is returned and p_did_hit_commit_limit will be set to true.
! // If the remainder portion of the chunk was too small to hold the allocation,
! // NULL is returned and p_did_hit_commit_limit will be set to false.
! MetaWord* Metachunk::allocate(size_t word_size, bool* p_did_hit_commit_limit) {
!
! size_t request_word_size = align_up(word_size, allocation_alignment_words);
!
! // Space enough left?
! if (free_words() < request_word_size) {
! *p_did_hit_commit_limit = false;
! return NULL;
}
+
+ // Expand committed region if necessary.
+ if (ensure_committed(used_words() + request_word_size) == false) {
+ *p_did_hit_commit_limit = true;
+ return NULL;
+ }
+
+ MetaWord* const p = top();
+
+ _used_words += request_word_size;
+
+ return p;
+
}
#ifdef ASSERT
+ void Metachunk::verify(bool slow) const {
+
+ // Note: only call this on a life Metachunk.
+ chklvl::check_valid_level(level());
+
+ assert(base() != NULL, "No base ptr");
+ assert(committed_words() >= used_words(), "Sanity");
+ assert(word_size() >= committed_words(), "Sanity");
+
+ // Test base pointer
+ assert(vsnode() != NULL, "No space");
+ vsnode()->check_pointer(base());
+ assert(base() != NULL, "Base pointer NULL");
+
+ // Starting address shall be aligned to chunk size.
+ const size_t required_alignment = word_size() * sizeof(MetaWord);
+ assert_is_aligned(base(), required_alignment);
+
+ // Used words
+ assert(used_words() < word_size(), "oob");
+
+ // If we are not a root chunk, we shall have a reference to a tree node
+ assert(tree_node_ref() != 0 || level() == chklvl::ROOT_CHUNK_LEVEL, "No parent node.");
+
+ }
#endif // ASSERT
!
! #ifdef ASSERT
!
! bool MetachunkList::contains(const Metachunk* c) const {
! for (Metachunk* c2 = first(); c2 != NULL; c2 = c2->next()) {
! if (c == c2) {
! return true;
! }
}
+ return false;
}
! void MetachunkList::verify(bool slow) const {
! int num = 0;
! for (Metachunk* c = first(); c != NULL; c = c->next()) {
! num ++;
! if (slow) {
! c->verify(false);
! }
! _num.check(num);
! }
}
+ #endif // ASSERT
+
} // namespace metaspace
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