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src/hotspot/share/memory/metaspace.cpp
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rev 49736 : [mq]: metaspace-additions-to-jcmd
@@ -41,10 +41,11 @@
#include "runtime/atomic.hpp"
#include "runtime/globals.hpp"
#include "runtime/init.hpp"
#include "runtime/java.hpp"
#include "runtime/mutex.hpp"
+#include "runtime/mutexLocker.hpp"
#include "runtime/orderAccess.inline.hpp"
#include "services/memTracker.hpp"
#include "services/memoryService.hpp"
#include "utilities/align.hpp"
#include "utilities/copy.hpp"
@@ -68,10 +69,32 @@
size_t Metaspace::_compressed_class_space_size;
const MetaspaceTracer* Metaspace::_tracer = NULL;
DEBUG_ONLY(bool Metaspace::_frozen = false;)
+// Internal statistics.
+#ifdef ASSERT
+struct {
+ // Number of allocations (from outside)
+ uintx num_allocs;
+ // Number of times a ClassLoaderMetaspace was born.
+ uintx num_metaspace_births;
+ // Number of times a ClassLoaderMetaspace died.
+ uintx num_metaspace_deaths;
+ // Number of times VirtualSpaceListNodes were created...
+ uintx num_vsnodes_created;
+ // ... and purged.
+ uintx num_vsnodes_purged;
+ // Number of times we expanded the committed section of the space.
+ uintx num_committed_space_expanded;
+ // Number of deallocations (e.g. retransformClasses etc)
+ uintx num_deallocs;
+ // Number of times an alloc was satisfied from deallocated blocks.
+ uintx num_allocs_from_deallocated_blocks;
+} g_internal_statistics;
+#endif
+
enum ChunkSizes { // in words.
ClassSpecializedChunk = 128,
SpecializedChunk = 128,
ClassSmallChunk = 256,
SmallChunk = 512,
@@ -142,26 +165,409 @@
static ChunkIndex prev_chunk_index(ChunkIndex i) {
assert(i > ZeroIndex, "Out of bound");
return (ChunkIndex) (i-1);
}
+static const char* space_type_name(Metaspace::MetaspaceType t) {
+ const char* s = NULL;
+ switch (t) {
+ case Metaspace::StandardMetaspaceType: s = "Standard"; break;
+ case Metaspace::BootMetaspaceType: s = "Boot"; break;
+ case Metaspace::AnonymousMetaspaceType: s = "Anonymous"; break;
+ case Metaspace::ReflectionMetaspaceType: s = "Reflection"; break;
+ }
+ assert(s != NULL, "Invalid space type");
+ return s;
+}
+
static const char* scale_unit(size_t scale) {
switch(scale) {
- case 1: return "BYTES";
+ case 1: return "bytes";
+ case sizeof(MetaWord): return "words";
case K: return "KB";
case M: return "MB";
case G: return "GB";
default:
ShouldNotReachHere();
return NULL;
}
}
+// Print a size, in bytes, scaled.
+static void print_scaled_bytes(outputStream* st, size_t byte_size, size_t scale = 0, int width = -1) {
+ if (scale == 0) {
+ // Dynamic mode. Choose scale for this value.
+ if (byte_size == 0) {
+ // Zero values are printed as bytes.
+ scale = 1;
+ } else {
+ if (byte_size >= G) {
+ scale = G;
+ } else if (byte_size >= M) {
+ scale = M;
+ } else if (byte_size >= K) {
+ scale = K;
+ } else {
+ scale = 1;
+ }
+ }
+ return print_scaled_bytes(st, byte_size, scale, width);
+ }
+
+#ifdef ASSERT
+ assert(scale == 1 || scale == sizeof(MetaWord) || scale == K || scale == M || scale == G, "Invalid scale");
+ // Special case: printing wordsize should only be done with word-sized values
+ if (scale == sizeof(MetaWord)) {
+ assert(byte_size % sizeof(MetaWord) == 0, "not word sized");
+ }
+#endif
+
+ if (scale == 1) {
+ st->print("%*" PRIuPTR " bytes", width, byte_size);
+ } else if (scale == sizeof(MetaWord)) {
+ st->print("%*" PRIuPTR " words", width, byte_size / sizeof(MetaWord));
+ } else {
+ const char* const unit = scale_unit(scale);
+ float display_value = (float) byte_size / scale;
+ // Since we use width to display a number with two trailing digits, increase it a bit.
+ width += 3;
+ // Prevent very small but non-null values showing up as 0.00.
+ if (byte_size > 0 && display_value < 0.01f) {
+ st->print("%*s %s", width, "<0.01", unit);
+ } else {
+ st->print("%*.2f %s", width, display_value, unit);
+ }
+ }
+}
+
+// Print a size, in words, scaled.
+static void print_scaled_words(outputStream* st, size_t word_size, size_t scale = 0, int width = -1) {
+ print_scaled_bytes(st, word_size * sizeof(MetaWord), scale, width);
+}
+
+static void print_percentage(outputStream* st, size_t total, size_t part) {
+ if (total == 0) {
+ st->print(" ?%%");
+ } else if (part == 0) {
+ st->print(" 0%%");
+ } else {
+ float p = ((float)part / total) * 100.0f;
+ if (p < 1.0f) {
+ st->print(" <1%%");
+ } else {
+ st->print("%3.0f%%", p);
+ }
+ }
+}
+
+// Convenience helper: prints a size value and a percentage.
+static void print_scaled_words_and_percentage(outputStream* st, size_t word_size, size_t compare_word_size, size_t scale = 0, int width = -1) {
+ print_scaled_words(st, word_size, scale, width);
+ st->print(" (");
+ print_percentage(st, compare_word_size, word_size);
+ st->print(")");
+}
+
volatile intptr_t MetaspaceGC::_capacity_until_GC = 0;
uint MetaspaceGC::_shrink_factor = 0;
bool MetaspaceGC::_should_concurrent_collect = false;
+/// statistics ///////
+
+// Contains statistics for a number of free chunks.
+class FreeChunksStatistics {
+ uintx _num; // Number of chunks
+ size_t _cap; // Total capacity, in words
+
+public:
+ FreeChunksStatistics() : _num(0), _cap(0) {}
+
+ void reset() {
+ _num = 0; _cap = 0;
+ }
+
+ uintx num() const { return _num; }
+ size_t cap() const { return _cap; }
+
+ void add(uintx n, size_t s) { _num += n; _cap += s; }
+ void add(const FreeChunksStatistics& other) {
+ _num += other._num;
+ _cap += other._cap;
+ }
+
+ void print_on(outputStream* st, size_t scale) const {
+ st->print(UINTX_FORMAT, _num);
+ st->print(" chunks, total capacity ");
+ print_scaled_words(st, _cap, scale);
+ }
+
+}; // end: FreeChunksStatistics
+
+// Contains statistics for a ChunkManager.
+class ChunkManagerStatistics {
+
+ FreeChunksStatistics _chunk_stats[NumberOfInUseLists];
+
+public:
+
+ // Free chunk statistics, by chunk index.
+ const FreeChunksStatistics& chunk_stats(ChunkIndex index) const { return _chunk_stats[index]; }
+ FreeChunksStatistics& chunk_stats(ChunkIndex index) { return _chunk_stats[index]; }
+
+ void reset() {
+ for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
+ _chunk_stats[i].reset();
+ }
+ }
+
+ size_t total_capacity() const {
+ return _chunk_stats[SpecializedIndex].cap() +
+ _chunk_stats[SmallIndex].cap() +
+ _chunk_stats[MediumIndex].cap() +
+ _chunk_stats[HumongousIndex].cap();
+ }
+
+ void print_on(outputStream* st, size_t scale) const {
+ FreeChunksStatistics totals;
+ for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
+ st->cr();
+ st->print("%12s chunks: ", chunk_size_name(i));
+ if (_chunk_stats[i].num() > 0) {
+ st->print(UINTX_FORMAT_W(4) ", capacity ", _chunk_stats[i].num());
+ print_scaled_words(st, _chunk_stats[i].cap(), scale);
+ } else {
+ st->print("(none)");
+ }
+ totals.add(_chunk_stats[i]);
+ }
+ st->cr();
+ st->print("%19s: " UINTX_FORMAT_W(4) ", capacity=", "Total", totals.num());
+ print_scaled_words(st, totals.cap(), scale);
+ st->cr();
+ }
+
+}; // ChunkManagerStatistics
+
+// Contains statistics for a number of chunks in use.
+// Each chunk has a used and free portion; however, there are current chunks (serving
+// potential future metaspace allocations) and non-current chunks. Unused portion of the
+// former is counted as free, unused portion of the latter counts as waste.
+class UsedChunksStatistics {
+ uintx _num; // Number of chunks
+ size_t _cap; // Total capacity, in words
+ size_t _used; // Total used area, in words
+ size_t _free; // Total free area (unused portions of current chunks), in words
+ size_t _waste; // Total waste area (unused portions of non-current chunks), in words
+
+public:
+
+ UsedChunksStatistics()
+ : _num(0), _cap(0), _used(0), _free(0), _waste(0)
+ {}
+
+ void reset() {
+ _num = 0;
+ _cap = _used = _free = _waste = 0;
+ }
+
+ uintx num() const { return _num; }
+
+ // Total capacity, in words
+ size_t cap() const { return _cap; }
+
+ // Total used area, in words
+ size_t used() const { return _used; }
+
+ // Total free area (unused portions of current chunks), in words
+ size_t free() const { return _free; }
+
+ // Total waste area (unused portions of non-current chunks), in words
+ size_t waste() const { return _waste; }
+
+ void add_num(uintx n) { _num += n; }
+ void add_cap(size_t s) { _cap += s; }
+ void add_used(size_t s) { _used += s; }
+ void add_free(size_t s) { _free += s; }
+ void add_waste(size_t s) { _waste += s; }
+
+ void add(const UsedChunksStatistics& other) {
+ _num += other._num;
+ _cap += other._cap;
+ _used += other._used;
+ _free += other._free;
+ _waste += other._waste;
+ }
+
+ void print_on(outputStream* st, size_t scale) const {
+ int col = st->position();
+ st->print(UINTX_FORMAT_W(3) " chunk%s, ", _num, _num != 1 ? "s" : "");
+ if (_num > 0) {
+ col += 12; st->fill_to(col);
+
+ print_scaled_words(st, _cap, scale, 5);
+ st->print(" capacity, ");
+
+ col += 18; st->fill_to(col);
+ print_scaled_words_and_percentage(st, _used, _cap, scale, 5);
+ st->print(" used, ");
+
+ col += 20; st->fill_to(col);
+ print_scaled_words_and_percentage(st, _free, _cap, scale, 5);
+ st->print(" free, ");
+
+ col += 20; st->fill_to(col);
+ print_scaled_words_and_percentage(st, _waste, _cap, scale, 5);
+ st->print(" waste");
+ }
+ }
+
+}; // UsedChunksStatistics
+
+// Class containing statistics for one or more space managers.
+class SpaceManagerStatistics {
+
+ UsedChunksStatistics _chunk_stats[NumberOfInUseLists];
+ uintx _free_blocks_num;
+ size_t _free_blocks_cap_words;
+
+public:
+
+ SpaceManagerStatistics() { reset(); }
+
+ void reset() {
+ for (int i = 0; i < NumberOfInUseLists; i ++) {
+ _chunk_stats[i].reset();
+ _free_blocks_num = 0; _free_blocks_cap_words = 0;
+ }
+ }
+
+ void add_free_blocks(uintx num, size_t cap) {
+ _free_blocks_num += num;
+ _free_blocks_cap_words += cap;
+ }
+
+ // Chunk statistics by chunk index
+ const UsedChunksStatistics& chunk_stats(ChunkIndex index) const { return _chunk_stats[index]; }
+ UsedChunksStatistics& chunk_stats(ChunkIndex index) { return _chunk_stats[index]; }
+
+ uintx free_blocks_num () const { return _free_blocks_num; }
+ size_t free_blocks_cap_words () const { return _free_blocks_cap_words; }
+
+ // Returns total chunk statistics over all chunk types.
+ UsedChunksStatistics totals() const {
+ UsedChunksStatistics stat;
+ for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
+ stat.add(_chunk_stats[i]);
+ }
+ return stat;
+ }
+
+ void add(const SpaceManagerStatistics& other) {
+ for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
+ _chunk_stats[i].add(other._chunk_stats[i]);
+ }
+ _free_blocks_num += other._free_blocks_num;
+ _free_blocks_cap_words += other._free_blocks_cap_words;
+ }
+
+ void print_on(outputStream* st, size_t scale, bool detailed) const {
+ UsedChunksStatistics totals;
+ for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
+ totals.add(_chunk_stats[i]);
+ }
+ streamIndentor sti(st);
+ if (detailed) {
+ st->cr_indent();
+ }
+ totals.print_on(st, scale);
+ if (_free_blocks_num > 0) {
+ if (detailed) {
+ st->cr_indent();
+ } else {
+ st->print(", ");
+ }
+ st->print("deallocated: " UINTX_FORMAT " blocks with ", _free_blocks_num);
+ print_scaled_words(st, _free_blocks_cap_words, scale);
+ }
+ if (detailed) {
+ st->cr_indent();
+ st->print("By chunk type:");
+ {
+ streamIndentor sti2(st);
+ for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
+ st->cr_indent();
+ st->print("%15s: ", chunk_size_name(i));
+ if (_chunk_stats[i].num() == 0) {
+ st->print(" (none)");
+ } else {
+ _chunk_stats[i].print_on(st, scale);
+ }
+ }
+ }
+ }
+ }
+
+}; // SpaceManagerStatistics
+
+class ClassLoaderMetaspaceStatistics {
+
+ SpaceManagerStatistics _sm_stats[Metaspace::MetadataTypeCount];
+
+public:
+
+ ClassLoaderMetaspaceStatistics() { reset(); }
+
+ void reset() {
+ nonclass_sm_stats().reset();
+ if (Metaspace::using_class_space()) {
+ class_sm_stats().reset();
+ }
+ }
+
+ const SpaceManagerStatistics& sm_stats(Metaspace::MetadataType mdType) const { return _sm_stats[mdType]; }
+ SpaceManagerStatistics& sm_stats(Metaspace::MetadataType mdType) { return _sm_stats[mdType]; }
+
+ const SpaceManagerStatistics& nonclass_sm_stats() const { return sm_stats(Metaspace::NonClassType); }
+ SpaceManagerStatistics& nonclass_sm_stats() { return sm_stats(Metaspace::NonClassType); }
+ const SpaceManagerStatistics& class_sm_stats() const { return sm_stats(Metaspace::ClassType); }
+ SpaceManagerStatistics& class_sm_stats() { return sm_stats(Metaspace::ClassType); }
+
+ // Returns total space manager statistics for both class and non-class metaspace
+ SpaceManagerStatistics totals() const {
+ SpaceManagerStatistics stats;
+ stats.add(nonclass_sm_stats());
+ if (Metaspace::using_class_space()) {
+ stats.add(class_sm_stats());
+ }
+ return stats;
+ }
+
+ void add(const ClassLoaderMetaspaceStatistics& other) {
+ nonclass_sm_stats().add(other.nonclass_sm_stats());
+ if (Metaspace::using_class_space()) {
+ class_sm_stats().add(other.class_sm_stats());
+ }
+ }
+
+ void print_on(outputStream* st, size_t scale, bool detailed) const {
+ streamIndentor sti(st);
+ st->cr_indent();
+ if (Metaspace::using_class_space()) {
+ st->print("Non-Class: ");
+ }
+ nonclass_sm_stats().print_on(st, scale, detailed);
+ if (Metaspace::using_class_space()) {
+ st->cr_indent();
+ st->print("Class: ");
+ class_sm_stats().print_on(st, scale, detailed);
+ }
+ st->cr();
+ }
+
+}; // ClassLoaderMetaspaceStatistics
+
+
typedef class FreeList<Metachunk> ChunkList;
// Manages the global free lists of chunks.
class ChunkManager : public CHeapObj<mtInternal> {
friend class TestVirtualSpaceNodeTest;
@@ -238,23 +644,10 @@
// Note that this chunk is supposed to be removed from the freelist right away.
Metachunk* split_chunk(size_t target_chunk_word_size, Metachunk* chunk);
public:
- struct ChunkManagerStatistics {
- size_t num_by_type[NumberOfFreeLists];
- size_t single_size_by_type[NumberOfFreeLists];
- size_t total_size_by_type[NumberOfFreeLists];
- size_t num_humongous_chunks;
- size_t total_size_humongous_chunks;
- };
-
- void locked_get_statistics(ChunkManagerStatistics* stat) const;
- void get_statistics(ChunkManagerStatistics* stat) const;
- static void print_statistics(const ChunkManagerStatistics* stat, outputStream* out, size_t scale);
-
-
ChunkManager(bool is_class)
: _is_class(is_class), _free_chunks_total(0), _free_chunks_count(0) {
_free_chunks[SpecializedIndex].set_size(get_size_for_nonhumongous_chunktype(SpecializedIndex, is_class));
_free_chunks[SmallIndex].set_size(get_size_for_nonhumongous_chunktype(SmallIndex, is_class));
_free_chunks[MediumIndex].set_size(get_size_for_nonhumongous_chunktype(MediumIndex, is_class));
@@ -356,13 +749,12 @@
void locked_print_free_chunks(outputStream* st);
void locked_print_sum_free_chunks(outputStream* st);
void print_on(outputStream* st) const;
- // Prints composition for both non-class and (if available)
- // class chunk manager.
- static void print_all_chunkmanagers(outputStream* out, size_t scale = 1);
+ void get_statistics(ChunkManagerStatistics* out) const;
+
};
class SmallBlocks : public CHeapObj<mtClass> {
const static uint _small_block_max_size = sizeof(TreeChunk<Metablock, FreeList<Metablock> >)/HeapWordSize;
const static uint _small_block_min_size = sizeof(Metablock)/HeapWordSize;
@@ -390,10 +782,19 @@
result = result + _small_lists[k].count() * _small_lists[k].size();
}
return result;
}
+ uintx total_num_blocks() const {
+ uintx result = 0;
+ for (uint i = _small_block_min_size; i < _small_block_max_size; i++) {
+ uint k = i - _small_block_min_size;
+ result = result + _small_lists[k].count();
+ }
+ return result;
+ }
+
static uint small_block_max_size() { return _small_block_max_size; }
static uint small_block_min_size() { return _small_block_min_size; }
MetaWord* get_block(size_t word_size) {
if (list_at(word_size).count() > 0) {
@@ -450,10 +851,18 @@
result = result + _small_blocks->total_size();
}
return result;
}
+ uintx num_blocks() const {
+ uintx result = dictionary()->total_free_blocks();
+ if (_small_blocks != NULL) {
+ result = result + _small_blocks->total_num_blocks();
+ }
+ return result;
+ }
+
static size_t min_dictionary_size() { return TreeChunk<Metablock, FreeList<Metablock> >::min_size(); }
void print_on(outputStream* st) const;
};
// Helper for Occupancy Bitmap. A type trait to give an all-bits-are-one-unsigned constant.
@@ -856,10 +1265,11 @@
// the smallest chunk size.
void retire(ChunkManager* chunk_manager);
void print_on(outputStream* st) const;
+ void print_on(outputStream* st, size_t scale) const;
void print_map(outputStream* st, bool is_class) const;
// Debug support
DEBUG_ONLY(void mangle();)
// Verify counters, all chunks in this list node and the occupancy map.
@@ -873,10 +1283,16 @@
#define assert_is_aligned(value, alignment) \
assert(is_aligned((value), (alignment)), \
SIZE_FORMAT_HEX " is not aligned to " \
SIZE_FORMAT, (size_t)(uintptr_t)value, (alignment))
+#define assert_counter(expected_value, real_value, msg) \
+ assert( (expected_value) == (real_value), \
+ "Counter mismatch (%s): expected " SIZE_FORMAT \
+ ", but got: " SIZE_FORMAT ".", msg, expected_value, \
+ real_value);
+
// Decide if large pages should be committed when the memory is reserved.
static bool should_commit_large_pages_when_reserving(size_t bytes) {
if (UseLargePages && UseLargePagesInMetaspace && !os::can_commit_large_page_memory()) {
size_t words = bytes / BytesPerWord;
bool is_class = false; // We never reserve large pages for the class space.
@@ -1180,10 +1596,11 @@
// Unlink empty VirtualSpaceNodes and free it.
void purge(ChunkManager* chunk_manager);
void print_on(outputStream* st) const;
+ void print_on(outputStream* st, size_t scale) const;
void print_map(outputStream* st) const;
class VirtualSpaceListIterator : public StackObj {
VirtualSpaceNode* _virtual_spaces;
public:
@@ -1216,10 +1633,11 @@
#endif
};
int Metadebug::_allocation_fail_alot_count = 0;
+
// SpaceManager - used by Metaspace to handle allocations
class SpaceManager : public CHeapObj<mtClass> {
friend class ClassLoaderMetaspace;
friend class Metadebug;
@@ -1245,12 +1663,12 @@
// Maximum number of specialize chunks to allocate for anonymous and delegating
// metadata space to a SpaceManager
static uint const _anon_and_delegating_metadata_specialize_chunk_limit;
- // Sum of all space in allocated chunks
- size_t _allocated_blocks_words;
+ // Sum of used space in chunks, including overhead incurred by chunk headers.
+ size_t _allocated_block_words;
// Sum of all allocated chunks
size_t _allocated_chunks_words;
size_t _allocated_chunks_count;
@@ -1285,10 +1703,16 @@
void add_chunk(Metachunk* v, bool make_current);
void retire_current_chunk();
Mutex* lock() const { return _lock; }
+ // Adds to the given statistic object. Must be locked with CLD metaspace lock.
+ void add_to_statistics_locked(SpaceManagerStatistics* out) const;
+
+ // Verify internal counters against the current state. Must be locked with CLD metaspace lock.
+ DEBUG_ONLY(void verify_metrics_locked() const;)
+
protected:
void initialize();
public:
SpaceManager(Metaspace::MetadataType mdtype,
@@ -1315,12 +1739,12 @@
size_t smallest_chunk_size() const { return smallest_chunk_size(is_class()); }
size_t medium_chunk_bunch() const { return medium_chunk_size() * MediumChunkMultiple; }
- size_t allocated_blocks_words() const { return _allocated_blocks_words; }
- size_t allocated_blocks_bytes() const { return _allocated_blocks_words * BytesPerWord; }
+ size_t allocated_blocks_words() const { return _allocated_block_words; }
+ size_t allocated_blocks_bytes() const { return _allocated_block_words * BytesPerWord; }
size_t allocated_chunks_words() const { return _allocated_chunks_words; }
size_t allocated_chunks_bytes() const { return _allocated_chunks_words * BytesPerWord; }
size_t allocated_chunks_count() const { return _allocated_chunks_count; }
bool is_humongous(size_t word_size) { return word_size > medium_chunk_size(); }
@@ -1343,17 +1767,11 @@
size_t adjust_initial_chunk_size(size_t requested) const;
// Get the initial chunks size for this metaspace type.
size_t get_initial_chunk_size(Metaspace::MetaspaceType type) const;
- size_t sum_capacity_in_chunks_in_use() const;
- size_t sum_used_in_chunks_in_use() const;
- size_t sum_free_in_chunks_in_use() const;
- size_t sum_waste_in_chunks_in_use() const;
- size_t sum_waste_in_chunks_in_use(ChunkIndex index ) const;
-
- size_t sum_count_in_chunks_in_use();
+ // Todo: remove this if we have counters by chunk type.
size_t sum_count_in_chunks_in_use(ChunkIndex i);
Metachunk* get_new_chunk(size_t chunk_word_size);
// Block allocation and deallocation.
@@ -1378,19 +1796,15 @@
// Notify memory usage to MemoryService.
void track_metaspace_memory_usage();
// debugging support.
- void dump(outputStream* const out) const;
void print_on(outputStream* st) const;
void locked_print_chunks_in_use_on(outputStream* st) const;
void verify();
void verify_chunk_size(Metachunk* chunk);
-#ifdef ASSERT
- void verify_allocated_blocks_words();
-#endif
// This adjusts the size given to be greater than the minimum allocation size in
// words for data in metaspace. Esentially the minimum size is currently 3 words.
size_t get_allocation_word_size(size_t word_size) {
size_t byte_size = word_size * BytesPerWord;
@@ -1401,10 +1815,17 @@
size_t raw_word_size = raw_bytes_size / BytesPerWord;
assert(raw_word_size * BytesPerWord == raw_bytes_size, "Size problem");
return raw_word_size;
}
+
+ // Adds to the given statistic object. Will lock with CLD metaspace lock.
+ void add_to_statistics(SpaceManagerStatistics* out) const;
+
+ // Verify internal counters against the current state. Will lock with CLD metaspace lock.
+ DEBUG_ONLY(void verify_metrics() const;)
+
};
uint const SpaceManager::_small_chunk_limit = 4;
uint const SpaceManager::_anon_and_delegating_metadata_specialize_chunk_limit = 4;
@@ -1701,10 +2122,11 @@
bool result = virtual_space()->expand_by(commit, false);
if (result) {
log_trace(gc, metaspace, freelist)("Expanded %s virtual space list node by " SIZE_FORMAT " words.",
(is_class() ? "class" : "non-class"), commit);
+ DEBUG_ONLY(Atomic::inc(&g_internal_statistics.num_committed_space_expanded));
} else {
log_trace(gc, metaspace, freelist)("Failed to expand %s virtual space list node by " SIZE_FORMAT " words.",
(is_class() ? "class" : "non-class"), commit);
}
@@ -1761,18 +2183,29 @@
return result;
}
void VirtualSpaceNode::print_on(outputStream* st) const {
- size_t used = used_words_in_vs();
- size_t capacity = capacity_words_in_vs();
+ print_on(st, K);
+}
+
+void VirtualSpaceNode::print_on(outputStream* st, size_t scale) const {
+ size_t used_words = used_words_in_vs();
+ size_t commit_words = committed_words();
+ size_t res_words = reserved_words();
VirtualSpace* vs = virtual_space();
- st->print_cr(" space @ " PTR_FORMAT " " SIZE_FORMAT "K, " SIZE_FORMAT_W(3) "%% used "
- "[" PTR_FORMAT ", " PTR_FORMAT ", "
+
+ st->print("node @" PTR_FORMAT ": ", p2i(this));
+ st->print("reserved=");
+ print_scaled_words(st, res_words, scale);
+ st->print(", committed=");
+ print_scaled_words_and_percentage(st, commit_words, res_words, scale);
+ st->print(", used=");
+ print_scaled_words_and_percentage(st, used_words, res_words, scale);
+ st->cr();
+ st->print(" [" PTR_FORMAT ", " PTR_FORMAT ", "
PTR_FORMAT ", " PTR_FORMAT ")",
- p2i(vs), capacity / K,
- capacity == 0 ? 0 : used * 100 / capacity,
p2i(bottom()), p2i(top()), p2i(end()),
p2i(vs->high_boundary()));
}
#ifdef ASSERT
@@ -1990,10 +2423,11 @@
// Don't free the current virtual space since it will likely
// be needed soon.
if (vsl->container_count() == 0 && vsl != current_virtual_space()) {
log_trace(gc, metaspace, freelist)("Purging VirtualSpaceNode " PTR_FORMAT " (capacity: " SIZE_FORMAT
", used: " SIZE_FORMAT ").", p2i(vsl), vsl->capacity_words_in_vs(), vsl->used_words_in_vs());
+ DEBUG_ONLY(Atomic::inc(&g_internal_statistics.num_vsnodes_purged));
// Unlink it from the list
if (prev_vsl == vsl) {
// This is the case of the current node being the first node.
assert(vsl == virtual_space_list(), "Expected to be the first node");
set_virtual_space_list(vsl->next());
@@ -2137,10 +2571,11 @@
assert(new_entry->reserved_words() == vs_word_size,
"Reserved memory size differs from requested memory size");
// ensure lock-free iteration sees fully initialized node
OrderAccess::storestore();
link_vs(new_entry);
+ DEBUG_ONLY(Atomic::inc(&g_internal_statistics.num_vsnodes_created));
return true;
}
}
void VirtualSpaceList::link_vs(VirtualSpaceNode* new_entry) {
@@ -2286,14 +2721,21 @@
return next;
}
void VirtualSpaceList::print_on(outputStream* st) const {
+ print_on(st, K);
+}
+
+void VirtualSpaceList::print_on(outputStream* st, size_t scale) const {
+ st->print_cr(SIZE_FORMAT " nodes, current node: " PTR_FORMAT,
+ _virtual_space_count, p2i(_current_virtual_space));
VirtualSpaceListIterator iter(virtual_space_list());
while (iter.repeat()) {
+ st->cr();
VirtualSpaceNode* node = iter.get_next();
- node->print_on(st);
+ node->print_on(st, scale);
}
}
void VirtualSpaceList::print_map(outputStream* st) const {
VirtualSpaceNode* list = virtual_space_list();
@@ -3070,84 +3512,14 @@
void ChunkManager::print_on(outputStream* out) const {
_humongous_dictionary.report_statistics(out);
}
-void ChunkManager::locked_get_statistics(ChunkManagerStatistics* stat) const {
- assert_lock_strong(MetaspaceExpand_lock);
- for (ChunkIndex i = ZeroIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) {
- stat->num_by_type[i] = num_free_chunks(i);
- stat->single_size_by_type[i] = size_by_index(i);
- stat->total_size_by_type[i] = size_free_chunks_in_bytes(i);
- }
- stat->num_humongous_chunks = num_free_chunks(HumongousIndex);
- stat->total_size_humongous_chunks = size_free_chunks_in_bytes(HumongousIndex);
-}
-
-void ChunkManager::get_statistics(ChunkManagerStatistics* stat) const {
- MutexLockerEx cl(MetaspaceExpand_lock,
- Mutex::_no_safepoint_check_flag);
- locked_get_statistics(stat);
-}
-
-void ChunkManager::print_statistics(const ChunkManagerStatistics* stat, outputStream* out, size_t scale) {
- size_t total = 0;
- assert(scale == 1 || scale == K || scale == M || scale == G, "Invalid scale");
-
- const char* unit = scale_unit(scale);
- for (ChunkIndex i = ZeroIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) {
- out->print(" " SIZE_FORMAT " %s (" SIZE_FORMAT " bytes) chunks, total ",
- stat->num_by_type[i], chunk_size_name(i),
- stat->single_size_by_type[i]);
- if (scale == 1) {
- out->print_cr(SIZE_FORMAT " bytes", stat->total_size_by_type[i]);
- } else {
- out->print_cr("%.2f%s", (float)stat->total_size_by_type[i] / scale, unit);
- }
-
- total += stat->total_size_by_type[i];
- }
-
-
- total += stat->total_size_humongous_chunks;
-
- if (scale == 1) {
- out->print_cr(" " SIZE_FORMAT " humongous chunks, total " SIZE_FORMAT " bytes",
- stat->num_humongous_chunks, stat->total_size_humongous_chunks);
-
- out->print_cr(" total size: " SIZE_FORMAT " bytes.", total);
- } else {
- out->print_cr(" " SIZE_FORMAT " humongous chunks, total %.2f%s",
- stat->num_humongous_chunks,
- (float)stat->total_size_humongous_chunks / scale, unit);
-
- out->print_cr(" total size: %.2f%s.", (float)total / scale, unit);
- }
-
-}
-
-void ChunkManager::print_all_chunkmanagers(outputStream* out, size_t scale) {
- assert(scale == 1 || scale == K || scale == M || scale == G, "Invalid scale");
-
- // Note: keep lock protection only to retrieving statistics; keep printing
- // out of lock protection
- ChunkManagerStatistics stat;
- out->print_cr("Chunkmanager (non-class):");
- const ChunkManager* const non_class_cm = Metaspace::chunk_manager_metadata();
- if (non_class_cm != NULL) {
- non_class_cm->get_statistics(&stat);
- ChunkManager::print_statistics(&stat, out, scale);
- } else {
- out->print_cr("unavailable.");
- }
- out->print_cr("Chunkmanager (class):");
- const ChunkManager* const class_cm = Metaspace::chunk_manager_class();
- if (class_cm != NULL) {
- class_cm->get_statistics(&stat);
- ChunkManager::print_statistics(&stat, out, scale);
- } else {
- out->print_cr("unavailable.");
+void ChunkManager::get_statistics(ChunkManagerStatistics* out) const {
+ MutexLockerEx cl(MetaspaceExpand_lock, Mutex::_no_safepoint_check_flag);
+ for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
+ out->chunk_stats(i).add(num_free_chunks(i), size_free_chunks_in_bytes(i) / sizeof(MetaWord));
}
}
// SpaceManager methods
@@ -3199,105 +3571,20 @@
SIZE_FORMAT " adjusted: " SIZE_FORMAT, requested, adjusted);
return adjusted;
}
-size_t SpaceManager::sum_free_in_chunks_in_use() const {
- MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
- size_t free = 0;
- for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
- Metachunk* chunk = chunks_in_use(i);
- while (chunk != NULL) {
- free += chunk->free_word_size();
- chunk = chunk->next();
- }
- }
- return free;
-}
-
-size_t SpaceManager::sum_waste_in_chunks_in_use() const {
- MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
- size_t result = 0;
- for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
- result += sum_waste_in_chunks_in_use(i);
- }
-
- return result;
-}
-
-size_t SpaceManager::sum_waste_in_chunks_in_use(ChunkIndex index) const {
- size_t result = 0;
- Metachunk* chunk = chunks_in_use(index);
- // Count the free space in all the chunk but not the
- // current chunk from which allocations are still being done.
- while (chunk != NULL) {
- if (chunk != current_chunk()) {
- result += chunk->free_word_size();
- }
- chunk = chunk->next();
- }
- return result;
-}
-
-size_t SpaceManager::sum_capacity_in_chunks_in_use() const {
- // For CMS use "allocated_chunks_words()" which does not need the
- // Metaspace lock. For the other collectors sum over the
- // lists. Use both methods as a check that "allocated_chunks_words()"
- // is correct. That is, sum_capacity_in_chunks() is too expensive
- // to use in the product and allocated_chunks_words() should be used
- // but allow for checking that allocated_chunks_words() returns the same
- // value as sum_capacity_in_chunks_in_use() which is the definitive
- // answer.
- if (UseConcMarkSweepGC) {
- return allocated_chunks_words();
- } else {
- MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
- size_t sum = 0;
- for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
- Metachunk* chunk = chunks_in_use(i);
- while (chunk != NULL) {
- sum += chunk->word_size();
- chunk = chunk->next();
- }
- }
- return sum;
- }
-}
-
-size_t SpaceManager::sum_count_in_chunks_in_use() {
- size_t count = 0;
- for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
- count = count + sum_count_in_chunks_in_use(i);
- }
-
- return count;
-}
-
size_t SpaceManager::sum_count_in_chunks_in_use(ChunkIndex i) {
size_t count = 0;
Metachunk* chunk = chunks_in_use(i);
while (chunk != NULL) {
count++;
chunk = chunk->next();
}
return count;
}
-
-size_t SpaceManager::sum_used_in_chunks_in_use() const {
- MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
- size_t used = 0;
- for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
- Metachunk* chunk = chunks_in_use(i);
- while (chunk != NULL) {
- used += chunk->used_word_size();
- chunk = chunk->next();
- }
- }
- return used;
-}
-
void SpaceManager::locked_print_chunks_in_use_on(outputStream* st) const {
for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
Metachunk* chunk = chunks_in_use(i);
st->print("SpaceManager: %s " PTR_FORMAT,
@@ -3415,36 +3702,21 @@
return mem;
}
void SpaceManager::print_on(outputStream* st) const {
-
- for (ChunkIndex i = ZeroIndex;
- i < NumberOfInUseLists ;
- i = next_chunk_index(i) ) {
- st->print_cr(" chunks_in_use " PTR_FORMAT " chunk size " SIZE_FORMAT,
- p2i(chunks_in_use(i)),
- chunks_in_use(i) == NULL ? 0 : chunks_in_use(i)->word_size());
- }
- st->print_cr(" waste: Small " SIZE_FORMAT " Medium " SIZE_FORMAT
- " Humongous " SIZE_FORMAT,
- sum_waste_in_chunks_in_use(SmallIndex),
- sum_waste_in_chunks_in_use(MediumIndex),
- sum_waste_in_chunks_in_use(HumongousIndex));
- // block free lists
- if (block_freelists() != NULL) {
- st->print_cr("total in block free lists " SIZE_FORMAT,
- block_freelists()->total_size());
- }
+ SpaceManagerStatistics stat;
+ add_to_statistics(&stat); // will lock _lock.
+ stat.print_on(st, 1*K, false);
}
SpaceManager::SpaceManager(Metaspace::MetadataType mdtype,
Metaspace::MetaspaceType space_type,
Mutex* lock) :
_mdtype(mdtype),
_space_type(space_type),
- _allocated_blocks_words(0),
+ _allocated_block_words(0),
_allocated_chunks_words(0),
_allocated_chunks_count(0),
_block_freelists(NULL),
_lock(lock)
{
@@ -3455,10 +3727,11 @@
assert_lock_strong(MetaspaceExpand_lock);
// Total of allocated Metachunks and allocated Metachunks count
// for each SpaceManager
_allocated_chunks_words = _allocated_chunks_words + words;
_allocated_chunks_count++;
+
// Global total of capacity in allocated Metachunks
MetaspaceUtils::inc_capacity(mdtype(), words);
// Global total of allocated Metablocks.
// used_words_slow() includes the overhead in each
// Metachunk so include it in the used when the
@@ -3467,20 +3740,18 @@
MetaspaceUtils::inc_used(mdtype(), Metachunk::overhead());
}
void SpaceManager::inc_used_metrics(size_t words) {
// Add to the per SpaceManager total
- Atomic::add(words, &_allocated_blocks_words);
+ Atomic::add(words, &_allocated_block_words);
// Add to the global total
MetaspaceUtils::inc_used(mdtype(), words);
}
void SpaceManager::dec_total_from_size_metrics() {
MetaspaceUtils::dec_capacity(mdtype(), allocated_chunks_words());
MetaspaceUtils::dec_used(mdtype(), allocated_blocks_words());
- // Also deduct the overhead per Metachunk
- MetaspaceUtils::dec_used(mdtype(), allocated_chunks_count() * Metachunk::overhead());
}
void SpaceManager::initialize() {
Metadebug::init_allocation_fail_alot_count();
for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
@@ -3489,24 +3760,17 @@
_current_chunk = NULL;
log_trace(gc, metaspace, freelist)("SpaceManager(): " PTR_FORMAT, p2i(this));
}
SpaceManager::~SpaceManager() {
+
// This call this->_lock which can't be done while holding MetaspaceExpand_lock
- assert(sum_capacity_in_chunks_in_use() == allocated_chunks_words(),
- "sum_capacity_in_chunks_in_use() " SIZE_FORMAT
- " allocated_chunks_words() " SIZE_FORMAT,
- sum_capacity_in_chunks_in_use(), allocated_chunks_words());
+ DEBUG_ONLY(verify_metrics());
MutexLockerEx fcl(MetaspaceExpand_lock,
Mutex::_no_safepoint_check_flag);
- assert(sum_count_in_chunks_in_use() == allocated_chunks_count(),
- "sum_count_in_chunks_in_use() " SIZE_FORMAT
- " allocated_chunks_count() " SIZE_FORMAT,
- sum_count_in_chunks_in_use(), allocated_chunks_count());
-
chunk_manager()->slow_locked_verify();
dec_total_from_size_metrics();
Log(gc, metaspace, freelist) log;
@@ -3538,11 +3802,11 @@
delete _block_freelists;
}
}
void SpaceManager::deallocate(MetaWord* p, size_t word_size) {
- assert_lock_strong(_lock);
+ assert_lock_strong(lock());
// Allocations and deallocations are in raw_word_size
size_t raw_word_size = get_allocation_word_size(word_size);
// Lazily create a block_freelist
if (block_freelists() == NULL) {
_block_freelists = new BlockFreelist();
@@ -3589,11 +3853,11 @@
inc_size_metrics(new_chunk->word_size());
assert(new_chunk->is_empty(), "Not ready for reuse");
Log(gc, metaspace, freelist) log;
if (log.is_trace()) {
- log.trace("SpaceManager::add_chunk: " SIZE_FORMAT ") ", sum_count_in_chunks_in_use());
+ log.trace("SpaceManager::add_chunk: " SIZE_FORMAT ") ", _allocated_chunks_count);
ResourceMark rm;
LogStream ls(log.trace());
new_chunk->print_on(&ls);
chunk_manager()->locked_print_free_chunks(&ls);
}
@@ -3638,10 +3902,13 @@
// from the dictionary until it starts to get fat. Is this
// a reasonable policy? Maybe an skinny dictionary is fast enough
// for allocations. Do some profiling. JJJ
if (fl != NULL && fl->total_size() > allocation_from_dictionary_limit) {
p = fl->get_block(raw_word_size);
+ if (p != NULL) {
+ DEBUG_ONLY(Atomic::inc(&g_internal_statistics.num_allocs_from_deallocated_blocks));
+ }
}
if (p == NULL) {
p = allocate_work(raw_word_size);
}
@@ -3649,11 +3916,11 @@
}
// Returns the address of spaced allocated for "word_size".
// This methods does not know about blocks (Metablocks)
MetaWord* SpaceManager::allocate_work(size_t word_size) {
- assert_lock_strong(_lock);
+ assert_lock_strong(lock());
#ifdef ASSERT
if (Metadebug::test_metadata_failure()) {
return NULL;
}
#endif
@@ -3695,65 +3962,79 @@
chunk->word_size() == specialized_chunk_size(),
"Chunk size is wrong");
return;
}
-#ifdef ASSERT
-void SpaceManager::verify_allocated_blocks_words() {
- // Verification is only guaranteed at a safepoint.
- assert(SafepointSynchronize::is_at_safepoint() || !Universe::is_fully_initialized(),
- "Verification can fail if the applications is running");
- assert(allocated_blocks_words() == sum_used_in_chunks_in_use(),
- "allocation total is not consistent " SIZE_FORMAT
- " vs " SIZE_FORMAT,
- allocated_blocks_words(), sum_used_in_chunks_in_use());
+void SpaceManager::add_to_statistics_locked(SpaceManagerStatistics* out) const {
+ assert_lock_strong(lock());
+ for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
+ UsedChunksStatistics& chunk_stat = out->chunk_stats(i);
+ Metachunk* chunk = chunks_in_use(i);
+ while (chunk != NULL) {
+ chunk_stat.add_num(1);
+ chunk_stat.add_cap(chunk->word_size());
+ chunk_stat.add_used(chunk->used_word_size());
+ if (chunk != current_chunk()) {
+ chunk_stat.add_waste(chunk->free_word_size());
+ } else {
+ chunk_stat.add_free(chunk->free_word_size());
+ }
+ chunk = chunk->next();
+ }
+ }
+ if (block_freelists() != NULL) {
+ out->add_free_blocks(block_freelists()->num_blocks(), block_freelists()->total_size());
+ }
}
-#endif
+void SpaceManager::add_to_statistics(SpaceManagerStatistics* out) const {
+ MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
+ add_to_statistics_locked(out);
+}
-void SpaceManager::dump(outputStream* const out) const {
- size_t curr_total = 0;
- size_t waste = 0;
- uint i = 0;
- size_t used = 0;
- size_t capacity = 0;
-
- // Add up statistics for all chunks in this SpaceManager.
- for (ChunkIndex index = ZeroIndex;
- index < NumberOfInUseLists;
- index = next_chunk_index(index)) {
- for (Metachunk* curr = chunks_in_use(index);
- curr != NULL;
- curr = curr->next()) {
- out->print("%d) ", i++);
- curr->print_on(out);
- curr_total += curr->word_size();
- used += curr->used_word_size();
- capacity += curr->word_size();
- waste += curr->free_word_size() + curr->overhead();;
- }
- }
+#ifdef ASSERT
+void SpaceManager::verify_metrics_locked() const {
+ assert_lock_strong(lock());
- if (log_is_enabled(Trace, gc, metaspace, freelist)) {
- if (block_freelists() != NULL) block_freelists()->print_on(out);
- }
+ SpaceManagerStatistics stat;
+ add_to_statistics_locked(&stat);
+
+ UsedChunksStatistics chunk_stats = stat.totals();
- size_t free = current_chunk() == NULL ? 0 : current_chunk()->free_word_size();
- // Free space isn't wasted.
- waste -= free;
+ assert_counter(_allocated_block_words, chunk_stats.used(), "SpaceManager::_allocated_blocks_words");
+ assert_counter(_allocated_chunks_words, chunk_stats.cap(), "SpaceManager::_allocated_chunks_words");
+ assert_counter(_allocated_chunks_count, chunk_stats.num(), "SpaceManager::_allocated_chunks_count");
+}
- out->print_cr("total of all chunks " SIZE_FORMAT " used " SIZE_FORMAT
- " free " SIZE_FORMAT " capacity " SIZE_FORMAT
- " waste " SIZE_FORMAT, curr_total, used, free, capacity, waste);
+void SpaceManager::verify_metrics() const {
+ MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
+ verify_metrics_locked();
}
+#endif // ASSERT
+
// MetaspaceUtils
size_t MetaspaceUtils::_capacity_words[] = {0, 0};
volatile size_t MetaspaceUtils::_used_words[] = {0, 0};
+
+// Collect used metaspace statistics. This involves walking the CLDG. The resulting
+// output will be the accumulated values for all live metaspaces.
+// Note: method does not do any locking.
+void MetaspaceUtils::collect_statistics(ClassLoaderMetaspaceStatistics* out) {
+ out->reset();
+ ClassLoaderDataGraphMetaspaceIterator iter;
+ while (iter.repeat()) {
+ ClassLoaderMetaspace* msp = iter.get_next();
+ if (msp != NULL) {
+ msp->add_to_statistics(out);
+ }
+ }
+}
+
size_t MetaspaceUtils::free_bytes(Metaspace::MetadataType mdtype) {
VirtualSpaceList* list = Metaspace::get_space_list(mdtype);
return list == NULL ? 0 : list->free_bytes();
}
@@ -3765,10 +4046,11 @@
assert_lock_strong(MetaspaceExpand_lock);
assert(words <= capacity_words(mdtype),
"About to decrement below 0: words " SIZE_FORMAT
" is greater than _capacity_words[%u] " SIZE_FORMAT,
words, mdtype, capacity_words(mdtype));
+
_capacity_words[mdtype] -= words;
}
void MetaspaceUtils::inc_capacity(Metaspace::MetadataType mdtype, size_t words) {
assert_lock_strong(MetaspaceExpand_lock);
@@ -3794,69 +4076,10 @@
// generally done concurrently by different application
// threads so must be done atomically.
Atomic::add(words, &_used_words[mdtype]);
}
-size_t MetaspaceUtils::used_bytes_slow(Metaspace::MetadataType mdtype) {
- size_t used = 0;
- ClassLoaderDataGraphMetaspaceIterator iter;
- while (iter.repeat()) {
- ClassLoaderMetaspace* msp = iter.get_next();
- // Sum allocated_blocks_words for each metaspace
- if (msp != NULL) {
- used += msp->used_words_slow(mdtype);
- }
- }
- return used * BytesPerWord;
-}
-
-size_t MetaspaceUtils::free_bytes_slow(Metaspace::MetadataType mdtype) {
- size_t free = 0;
- ClassLoaderDataGraphMetaspaceIterator iter;
- while (iter.repeat()) {
- ClassLoaderMetaspace* msp = iter.get_next();
- if (msp != NULL) {
- free += msp->free_words_slow(mdtype);
- }
- }
- return free * BytesPerWord;
-}
-
-size_t MetaspaceUtils::capacity_bytes_slow(Metaspace::MetadataType mdtype) {
- if ((mdtype == Metaspace::ClassType) && !Metaspace::using_class_space()) {
- return 0;
- }
- // Don't count the space in the freelists. That space will be
- // added to the capacity calculation as needed.
- size_t capacity = 0;
- ClassLoaderDataGraphMetaspaceIterator iter;
- while (iter.repeat()) {
- ClassLoaderMetaspace* msp = iter.get_next();
- if (msp != NULL) {
- capacity += msp->capacity_words_slow(mdtype);
- }
- }
- return capacity * BytesPerWord;
-}
-
-size_t MetaspaceUtils::capacity_bytes_slow() {
-#ifdef PRODUCT
- // Use capacity_bytes() in PRODUCT instead of this function.
- guarantee(false, "Should not call capacity_bytes_slow() in the PRODUCT");
-#endif
- size_t class_capacity = capacity_bytes_slow(Metaspace::ClassType);
- size_t non_class_capacity = capacity_bytes_slow(Metaspace::NonClassType);
- assert(capacity_bytes() == class_capacity + non_class_capacity,
- "bad accounting: capacity_bytes() " SIZE_FORMAT
- " class_capacity + non_class_capacity " SIZE_FORMAT
- " class_capacity " SIZE_FORMAT " non_class_capacity " SIZE_FORMAT,
- capacity_bytes(), class_capacity + non_class_capacity,
- class_capacity, non_class_capacity);
-
- return class_capacity + non_class_capacity;
-}
-
size_t MetaspaceUtils::reserved_bytes(Metaspace::MetadataType mdtype) {
VirtualSpaceList* list = Metaspace::get_space_list(mdtype);
return list == NULL ? 0 : list->reserved_bytes();
}
@@ -3932,284 +4155,363 @@
committed_bytes(ct)/K,
reserved_bytes(ct)/K);
}
}
-// Print information for class space and data space separately.
-// This is almost the same as above.
-void MetaspaceUtils::print_on(outputStream* out, Metaspace::MetadataType mdtype) {
- size_t free_chunks_capacity_bytes = free_chunks_total_bytes(mdtype);
- size_t capacity_bytes = capacity_bytes_slow(mdtype);
- size_t used_bytes = used_bytes_slow(mdtype);
- size_t free_bytes = free_bytes_slow(mdtype);
- size_t used_and_free = used_bytes + free_bytes +
- free_chunks_capacity_bytes;
- out->print_cr(" Chunk accounting: (used in chunks " SIZE_FORMAT
- "K + unused in chunks " SIZE_FORMAT "K + "
- " capacity in free chunks " SIZE_FORMAT "K) = " SIZE_FORMAT
- "K capacity in allocated chunks " SIZE_FORMAT "K",
- used_bytes / K,
- free_bytes / K,
- free_chunks_capacity_bytes / K,
- used_and_free / K,
- capacity_bytes / K);
- // Accounting can only be correct if we got the values during a safepoint
- assert(!SafepointSynchronize::is_at_safepoint() || used_and_free == capacity_bytes, "Accounting is wrong");
-}
-
-// Print total fragmentation for class metaspaces
-void MetaspaceUtils::print_class_waste(outputStream* out) {
- assert(Metaspace::using_class_space(), "class metaspace not used");
- size_t cls_specialized_waste = 0, cls_small_waste = 0, cls_medium_waste = 0;
- size_t cls_specialized_count = 0, cls_small_count = 0, cls_medium_count = 0, cls_humongous_count = 0;
- ClassLoaderDataGraphMetaspaceIterator iter;
- while (iter.repeat()) {
- ClassLoaderMetaspace* msp = iter.get_next();
- if (msp != NULL) {
- cls_specialized_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(SpecializedIndex);
- cls_specialized_count += msp->class_vsm()->sum_count_in_chunks_in_use(SpecializedIndex);
- cls_small_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(SmallIndex);
- cls_small_count += msp->class_vsm()->sum_count_in_chunks_in_use(SmallIndex);
- cls_medium_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(MediumIndex);
- cls_medium_count += msp->class_vsm()->sum_count_in_chunks_in_use(MediumIndex);
- cls_humongous_count += msp->class_vsm()->sum_count_in_chunks_in_use(HumongousIndex);
- }
- }
- out->print_cr(" class: " SIZE_FORMAT " specialized(s) " SIZE_FORMAT ", "
- SIZE_FORMAT " small(s) " SIZE_FORMAT ", "
- SIZE_FORMAT " medium(s) " SIZE_FORMAT ", "
- "large count " SIZE_FORMAT,
- cls_specialized_count, cls_specialized_waste,
- cls_small_count, cls_small_waste,
- cls_medium_count, cls_medium_waste, cls_humongous_count);
-}
-
-// Print total fragmentation for data and class metaspaces separately
-void MetaspaceUtils::print_waste(outputStream* out) {
- size_t specialized_waste = 0, small_waste = 0, medium_waste = 0;
- size_t specialized_count = 0, small_count = 0, medium_count = 0, humongous_count = 0;
-
- ClassLoaderDataGraphMetaspaceIterator iter;
- while (iter.repeat()) {
- ClassLoaderMetaspace* msp = iter.get_next();
- if (msp != NULL) {
- specialized_waste += msp->vsm()->sum_waste_in_chunks_in_use(SpecializedIndex);
- specialized_count += msp->vsm()->sum_count_in_chunks_in_use(SpecializedIndex);
- small_waste += msp->vsm()->sum_waste_in_chunks_in_use(SmallIndex);
- small_count += msp->vsm()->sum_count_in_chunks_in_use(SmallIndex);
- medium_waste += msp->vsm()->sum_waste_in_chunks_in_use(MediumIndex);
- medium_count += msp->vsm()->sum_count_in_chunks_in_use(MediumIndex);
- humongous_count += msp->vsm()->sum_count_in_chunks_in_use(HumongousIndex);
- }
- }
- out->print_cr("Total fragmentation waste (words) doesn't count free space");
- out->print_cr(" data: " SIZE_FORMAT " specialized(s) " SIZE_FORMAT ", "
- SIZE_FORMAT " small(s) " SIZE_FORMAT ", "
- SIZE_FORMAT " medium(s) " SIZE_FORMAT ", "
- "large count " SIZE_FORMAT,
- specialized_count, specialized_waste, small_count,
- small_waste, medium_count, medium_waste, humongous_count);
- if (Metaspace::using_class_space()) {
- print_class_waste(out);
- }
-}
-
-class MetadataStats {
+class PrintCLDMetaspaceInfoClosure : public CLDClosure {
private:
- size_t _capacity;
- size_t _used;
- size_t _free;
- size_t _waste;
+ outputStream* const _out;
+ const size_t _scale;
+ const bool _do_print;
+ const bool _break_down_by_chunktype;
public:
- MetadataStats() : _capacity(0), _used(0), _free(0), _waste(0) { }
- MetadataStats(size_t capacity, size_t used, size_t free, size_t waste)
- : _capacity(capacity), _used(used), _free(free), _waste(waste) { }
-
- void add(const MetadataStats& stats) {
- _capacity += stats.capacity();
- _used += stats.used();
- _free += stats.free();
- _waste += stats.waste();
- }
-
- size_t capacity() const { return _capacity; }
- size_t used() const { return _used; }
- size_t free() const { return _free; }
- size_t waste() const { return _waste; }
- void print_on(outputStream* out, size_t scale) const;
-};
+ uintx _num_loaders_with_metaspace;
+ uintx _num_loaders_without_metaspace;
+ ClassLoaderMetaspaceStatistics _stats_total;
-
-void MetadataStats::print_on(outputStream* out, size_t scale) const {
- const char* unit = scale_unit(scale);
- out->print_cr("capacity=%10.2f%s used=%10.2f%s free=%10.2f%s waste=%10.2f%s",
- (float)capacity() / scale, unit,
- (float)used() / scale, unit,
- (float)free() / scale, unit,
- (float)waste() / scale, unit);
-}
-
-class PrintCLDMetaspaceInfoClosure : public CLDClosure {
-private:
- outputStream* _out;
- size_t _scale;
-
- size_t _total_count;
- MetadataStats _total_metadata;
- MetadataStats _total_class;
-
- size_t _total_anon_count;
- MetadataStats _total_anon_metadata;
- MetadataStats _total_anon_class;
+ uintx _num_loaders_by_spacetype [Metaspace::MetaspaceTypeCount];
+ ClassLoaderMetaspaceStatistics _stats_by_spacetype [Metaspace::MetaspaceTypeCount];
public:
- PrintCLDMetaspaceInfoClosure(outputStream* out, size_t scale = K)
- : _out(out), _scale(scale), _total_count(0), _total_anon_count(0) { }
-
- ~PrintCLDMetaspaceInfoClosure() {
- print_summary();
+ PrintCLDMetaspaceInfoClosure(outputStream* out, size_t scale, bool do_print, bool break_down_by_chunktype)
+ : _out(out), _scale(scale), _do_print(do_print), _break_down_by_chunktype(break_down_by_chunktype)
+ , _num_loaders_with_metaspace(0)
+ , _num_loaders_without_metaspace(0)
+ {
+ memset(_num_loaders_by_spacetype, 0, sizeof(_num_loaders_by_spacetype));
}
void do_cld(ClassLoaderData* cld) {
+
assert(SafepointSynchronize::is_at_safepoint(), "Must be at a safepoint");
- if (cld->is_unloading()) return;
ClassLoaderMetaspace* msp = cld->metaspace_or_null();
if (msp == NULL) {
+ _num_loaders_without_metaspace ++;
return;
}
- bool anonymous = false;
+ // Collect statistics for this class loader metaspace
+ ClassLoaderMetaspaceStatistics this_cld_stat;
+ msp->add_to_statistics(&this_cld_stat);
+
+ // And add it to the running totals
+ _stats_total.add(this_cld_stat);
+ _num_loaders_with_metaspace ++;
+ _stats_by_spacetype[msp->space_type()].add(this_cld_stat);
+ _num_loaders_by_spacetype[msp->space_type()] ++;
+
+ // Optionally, print.
+ if (_do_print) {
+
+ _out->print(UINTX_FORMAT_W(4) ": ", _num_loaders_with_metaspace);
+
if (cld->is_anonymous()) {
- _out->print_cr("ClassLoader: for anonymous class");
- anonymous = true;
+ _out->print("ClassLoaderData " PTR_FORMAT " for anonymous class", p2i(cld));
} else {
ResourceMark rm;
- _out->print_cr("ClassLoader: %s", cld->loader_name());
+ _out->print("ClassLoaderData " PTR_FORMAT " for %s", p2i(cld), cld->loader_name());
}
- print_metaspace(msp, anonymous);
- _out->cr();
+ if (msp->space_type() != Metaspace::StandardMetaspaceType) {
+ _out->print(", %s loader", space_type_name(msp->space_type()));
}
-private:
- void print_metaspace(ClassLoaderMetaspace* msp, bool anonymous);
- void print_summary() const;
-};
-
-void PrintCLDMetaspaceInfoClosure::print_metaspace(ClassLoaderMetaspace* msp, bool anonymous){
- assert(msp != NULL, "Sanity");
- SpaceManager* vsm = msp->vsm();
- const char* unit = scale_unit(_scale);
-
- size_t capacity = vsm->sum_capacity_in_chunks_in_use() * BytesPerWord;
- size_t used = vsm->sum_used_in_chunks_in_use() * BytesPerWord;
- size_t free = vsm->sum_free_in_chunks_in_use() * BytesPerWord;
- size_t waste = vsm->sum_waste_in_chunks_in_use() * BytesPerWord;
-
- _total_count ++;
- MetadataStats metadata_stats(capacity, used, free, waste);
- _total_metadata.add(metadata_stats);
-
- if (anonymous) {
- _total_anon_count ++;
- _total_anon_metadata.add(metadata_stats);
+ if (cld->is_unloading()) {
+ _out->print(", unloading");
}
- _out->print(" Metadata ");
- metadata_stats.print_on(_out, _scale);
+ _out->cr();
+ this_cld_stat.print_on(_out, _scale, _break_down_by_chunktype);
+ _out->cr();
- if (Metaspace::using_class_space()) {
- vsm = msp->class_vsm();
+ }
+
+ } // do_cld
- capacity = vsm->sum_capacity_in_chunks_in_use() * BytesPerWord;
- used = vsm->sum_used_in_chunks_in_use() * BytesPerWord;
- free = vsm->sum_free_in_chunks_in_use() * BytesPerWord;
- waste = vsm->sum_waste_in_chunks_in_use() * BytesPerWord;
+};
- MetadataStats class_stats(capacity, used, free, waste);
- _total_class.add(class_stats);
+void MetaspaceUtils::print_report(outputStream* out, size_t scale, int flags) {
- if (anonymous) {
- _total_anon_class.add(class_stats);
+ const bool print_loaders = (flags & rf_show_loaders) > 0;
+ const bool print_by_chunktype = (flags & rf_break_down_by_chunktype) > 0;
+ const bool print_by_spacetype = (flags & rf_break_down_by_spacetype) > 0;
+ bool have_detailed_cl_data = false;
+
+ // Some report options require walking the class loader data graph.
+ PrintCLDMetaspaceInfoClosure cl(out, scale, print_loaders, print_by_chunktype);
+ if (print_loaders) {
+ out->cr();
+ out->print_cr("Usage per loader:");
+ out->cr();
+ }
+ if (print_loaders || print_by_chunktype || print_by_spacetype) {
+ ClassLoaderDataGraph::cld_do(&cl); // collect data and optionally print
+ have_detailed_cl_data = true;
}
- _out->print(" Class data ");
- class_stats.print_on(_out, _scale);
+ // Print totals, broken up by space type.
+ if (print_by_spacetype) {
+ out->cr();
+ out->print_cr("Usage per space type:");
+ out->cr();
+ for (int space_type = (int)Metaspace::ZeroMetaspaceType;
+ space_type < (int)Metaspace::MetaspaceTypeCount; space_type ++)
+ {
+ uintx num = cl._num_loaders_by_spacetype[space_type];
+ out->print("%s: " UINTX_FORMAT " spaces%c",
+ space_type_name((Metaspace::MetaspaceType)space_type),
+ num, num > 0 ? ':' : '.');
+ if (num > 0) {
+ out->cr();
+ cl._stats_by_spacetype[space_type].print_on(out, scale, print_by_chunktype);
+ }
+ out->cr();
+ }
}
-}
-void PrintCLDMetaspaceInfoClosure::print_summary() const {
- const char* unit = scale_unit(_scale);
- _out->cr();
- _out->print_cr("Summary:");
+ // Print totals for in-use data:
+ out->cr();
+ out->print_cr("Total Usage:");
+ out->cr();
- MetadataStats total;
- total.add(_total_metadata);
- total.add(_total_class);
+ if (have_detailed_cl_data) {
+ out->print_cr(UINTX_FORMAT " loaders (" UINTX_FORMAT " without metaspace)",
+ cl._num_loaders_with_metaspace + cl._num_loaders_without_metaspace, cl._num_loaders_without_metaspace);
+ out->cr();
+ cl._stats_total.print_on(out, scale, print_by_chunktype);
+ } else {
+ // In its most basic form, we do not require walking the CLDG. Instead, just print the running totals from
+ // MetaspaceUtils.
+ const size_t cap_nonclass = MetaspaceUtils::capacity_words(Metaspace::NonClassType);
+ const size_t used_nonclass = MetaspaceUtils::used_words(Metaspace::NonClassType);
+ const size_t free_and_waste_nonclass = cap_nonclass - used_nonclass;
+ if (Metaspace::using_class_space()) {
+ out->print_cr(" Non-class space:");
+ }
+ print_scaled_words(out, cap_nonclass, scale, 6);
+ out->print(" capacity, ");
+ print_scaled_words_and_percentage(out, used_nonclass, cap_nonclass, scale, 6);
+ out->print(" used, ");
+ print_scaled_words_and_percentage(out, free_and_waste_nonclass, cap_nonclass, scale, 6);
+ out->print(" free+waste. ");
- _out->print(" Total class loaders=" SIZE_FORMAT_W(6) " ", _total_count);
- total.print_on(_out, _scale);
+ if (Metaspace::using_class_space()) {
+ out->print_cr(" Class space:");
+ const size_t cap_class = MetaspaceUtils::capacity_words(Metaspace::ClassType);
+ const size_t used_class = MetaspaceUtils::used_words(Metaspace::ClassType);
+ const size_t free_and_waste_class = cap_class - used_class;
+ print_scaled_words(out, cap_class, scale, 6);
+ out->print(" capacity, ");
+ print_scaled_words_and_percentage(out, used_class, cap_class, scale, 6);
+ out->print(" used, ");
+ print_scaled_words_and_percentage(out, free_and_waste_class, cap_class, scale, 6);
+ out->print(" free+waste. ");
+
+ out->print_cr(" Total:");
+ const size_t cap = cap_nonclass + cap_class;
+ const size_t used = used_nonclass + used_class;
+ const size_t free_and_waste = free_and_waste_nonclass + free_and_waste_class;
+ print_scaled_words(out, cap, scale, 6);
+ out->print(" capacity, ");
+ print_scaled_words_and_percentage(out, used, cap, scale, 6);
+ out->print(" used, ");
+ print_scaled_words_and_percentage(out, free_and_waste, cap, scale, 6);
+ out->print(" free+waste. ");
+ }
+ out->cr();
+ }
- _out->print(" Metadata ");
- _total_metadata.print_on(_out, _scale);
+ // -- Print Virtual space.
+ out->cr();
+ out->print_cr("Virtual Space:");
+ out->cr();
+ const size_t reserved_nonclass_words = reserved_bytes(Metaspace::NonClassType) / sizeof(MetaWord);
+ const size_t committed_nonclass_words = committed_bytes(Metaspace::NonClassType) / sizeof(MetaWord);
+ const size_t reserved_class_words = reserved_bytes(Metaspace::ClassType) / sizeof(MetaWord);
+ const size_t committed_class_words = committed_bytes(Metaspace::ClassType) / sizeof(MetaWord);
+ const size_t reserved_words = reserved_nonclass_words + reserved_class_words;
+ const size_t committed_words = committed_nonclass_words + committed_class_words;
+ {
+ if (Metaspace::using_class_space()) {
+ out->print_cr(" Non-class space:");
+ }
+ print_scaled_words(out, reserved_nonclass_words, scale, 7);
+ out->print(" reserved, ");
+ print_scaled_words_and_percentage(out, committed_nonclass_words, reserved_nonclass_words, scale, 7);
+ out->print(" committed ");
if (Metaspace::using_class_space()) {
- _out->print(" Class data ");
- _total_class.print_on(_out, _scale);
+ out->print_cr(" Class space:");
+ print_scaled_words(out, reserved_nonclass_words, scale, 7);
+ out->print(" reserved, ");
+ print_scaled_words_and_percentage(out, committed_class_words, reserved_class_words, scale, 7);
+ out->print(" committed ");
+
+ out->print_cr(" Total:");
+ print_scaled_words(out, reserved_words, scale, 7);
+ out->print(" reserved, ");
+ print_scaled_words_and_percentage(out, committed_words, reserved_words, scale, 7);
+ out->print(" committed ");
}
- _out->cr();
+ }
+ out->cr();
- MetadataStats total_anon;
- total_anon.add(_total_anon_metadata);
- total_anon.add(_total_anon_class);
+ // -- Print VirtualSpaceList details.
+ if ((flags & rf_show_vslist) > 0) {
+ out->cr();
+ out->print_cr("Virtual Space List%s:", Metaspace::using_class_space() ? "s" : "");
+ out->cr();
+ if (Metaspace::using_class_space()) {
+ out->print_cr(" Non-Class:");
+ }
+ Metaspace::space_list()->print_on(out, scale);
+ if (Metaspace::using_class_space()) {
+ out->print_cr(" Class:");
+ Metaspace::class_space_list()->print_on(out, scale);
+ }
+ }
+ out->cr();
- _out->print("For anonymous classes=" SIZE_FORMAT_W(6) " ", _total_anon_count);
- total_anon.print_on(_out, _scale);
+ // -- Print VirtualSpaceList map.
+ if ((flags & rf_show_vsmap) > 0) {
+ out->cr();
+ out->print_cr("Virtual Space Map:");
+ out->cr();
+ if (Metaspace::using_class_space()) {
+ out->print_cr(" Non-Class:");
+ }
+ Metaspace::space_list()->print_map(out);
+ if (Metaspace::using_class_space()) {
+ out->print_cr(" Class:");
+ Metaspace::class_space_list()->print_map(out);
+ }
+ }
+ out->cr();
+
+ // -- Print Freelists (ChunkManager) details
+ out->cr();
+ out->print("Free Chunk List%s:", Metaspace::using_class_space() ? "s" : "");
+ out->cr();
- _out->print(" Metadata ");
- _total_anon_metadata.print_on(_out, _scale);
+ if ((flags & rf_show_chunk_freelist) > 0) {
+ ChunkManagerStatistics non_class_cm_stat;
+ Metaspace::chunk_manager_metadata()->get_statistics(&non_class_cm_stat);
+ ChunkManagerStatistics class_cm_stat;
+ Metaspace::chunk_manager_class()->get_statistics(&class_cm_stat);
if (Metaspace::using_class_space()) {
- _out->print(" Class data ");
- _total_anon_class.print_on(_out, _scale);
+ out->print_cr(" Non-Class:");
}
-}
+ non_class_cm_stat.print_on(out, scale);
-void MetaspaceUtils::print_metadata_for_nmt(outputStream* out, size_t scale) {
- const char* unit = scale_unit(scale);
- out->print_cr("Metaspaces:");
- out->print_cr(" Metadata space: reserved=" SIZE_FORMAT_W(10) "%s committed=" SIZE_FORMAT_W(10) "%s",
- reserved_bytes(Metaspace::NonClassType) / scale, unit,
- committed_bytes(Metaspace::NonClassType) / scale, unit);
if (Metaspace::using_class_space()) {
- out->print_cr(" Class space: reserved=" SIZE_FORMAT_W(10) "%s committed=" SIZE_FORMAT_W(10) "%s",
- reserved_bytes(Metaspace::ClassType) / scale, unit,
- committed_bytes(Metaspace::ClassType) / scale, unit);
+ out->print_cr(" Class:");
+ class_cm_stat.print_on(out, scale);
+ }
+ } else {
+ // In its basic form, report only capacity in free chunks, but take those numbers from the
+ // running totals in the chunk managers to avoid locking.
+ if (Metaspace::using_class_space()) {
+ out->print_cr(" Non-Class:");
+ }
+ print_scaled_bytes(out, Metaspace::chunk_manager_metadata()->free_chunks_total_words(), scale);
+ out->cr();
+ if (Metaspace::using_class_space()) {
+ out->print_cr(" Class:");
+ print_scaled_bytes(out, Metaspace::chunk_manager_class()->free_chunks_total_words(), scale);
+ out->cr();
+ }
+ out->cr();
}
+ // As a convenience, print a summary of common waste.
+ out->cr();
+ out->print_cr("Waste:");
+ // For all wastages, print percentages from total. As total use the total size of memory committed for metaspace.
+ out->print(" (Percentages are of total committed metaspace size (");
+ print_scaled_words(out, committed_words, scale);
+ out->print_cr(")");
+
+ // Print waste for in-use chunks.
+ if (have_detailed_cl_data) {
+ UsedChunksStatistics ucs_nonclass = cl._stats_total.nonclass_sm_stats().totals();
+ UsedChunksStatistics ucs_class = cl._stats_total.class_sm_stats().totals();
+ UsedChunksStatistics ucs_all;
+ ucs_all.add(ucs_nonclass);
+ ucs_all.add(ucs_class);
+ out->print("Waste in chunks in use: ");
+ print_scaled_words_and_percentage(out, ucs_all.waste(), committed_words, scale, 6);
out->cr();
- ChunkManager::print_all_chunkmanagers(out, scale);
+ out->print("Free in chunks in use: ");
+ print_scaled_words_and_percentage(out, ucs_all.free(), committed_words, scale, 6);
+ out->cr();
+ } else {
+ // if we did not walk the CLDG, use the running numbers.
+ size_t free_and_waste_words = MetaspaceUtils::capacity_words() - MetaspaceUtils::used_words();
+ out->print("Free+Waste in chunks in use: ");
+ print_scaled_words_and_percentage(out, free_and_waste_words, committed_words, scale, 6);
+ out->cr();
+ }
+ // Print waste in deallocated blocks.
+ if (have_detailed_cl_data) {
+ const uintx free_blocks_num =
+ cl._stats_total.nonclass_sm_stats().free_blocks_num() +
+ cl._stats_total.class_sm_stats().free_blocks_num();
+ const size_t free_blocks_cap_words =
+ cl._stats_total.nonclass_sm_stats().free_blocks_cap_words() +
+ cl._stats_total.class_sm_stats().free_blocks_cap_words();
+ out->print("Deallocated from chunks in use: " UINTX_FORMAT " blocks, total size ", free_blocks_num);
+ print_scaled_words_and_percentage(out, free_blocks_cap_words, committed_words, scale, 6);
out->cr();
- out->print_cr("Per-classloader metadata:");
+ }
+
+ // Print waste in free chunks.
+ {
+ const size_t total_capacity_in_free_chunks =
+ Metaspace::chunk_manager_metadata()->free_chunks_total_words() +
+ Metaspace::chunk_manager_class()->free_chunks_total_words();
+ out->print("In free chunks: ");
+ print_scaled_words_and_percentage(out, total_capacity_in_free_chunks, committed_words, scale, 6);
out->cr();
+ }
- PrintCLDMetaspaceInfoClosure cl(out, scale);
- ClassLoaderDataGraph::cld_do(&cl);
-}
+ // Print internal statistics
+#ifdef ASSERT
+ out->cr();
+ out->cr();
+ out->print_cr("Internal statistics:");
+ out->cr();
+ out->print_cr("Number of allocations: " UINTX_FORMAT ".", g_internal_statistics.num_allocs);
+ out->print_cr("Number of space births: " UINTX_FORMAT ".", g_internal_statistics.num_metaspace_births);
+ out->print_cr("Number of space deaths: " UINTX_FORMAT ".", g_internal_statistics.num_metaspace_deaths);
+ out->print_cr("Number of virtual space node births: " UINTX_FORMAT ".", g_internal_statistics.num_vsnodes_created);
+ out->print_cr("Number of virtual space node deaths: " UINTX_FORMAT ".", g_internal_statistics.num_vsnodes_purged);
+ out->print_cr("Number of times virtual space nodes were expanded: " UINTX_FORMAT ".", g_internal_statistics.num_committed_space_expanded);
+ out->print_cr("Number of de-allocations: " UINTX_FORMAT ".", g_internal_statistics.num_deallocs);
+ out->print_cr("Allocs statisfied from deallocated blocks: " UINTX_FORMAT ".", g_internal_statistics.num_allocs_from_deallocated_blocks);
+ out->cr();
+#endif
+ // Print some interesting settings
+ out->cr();
+ out->cr();
+ out->print("MaxMetaspaceSize: ");
+ print_scaled_bytes(out, MaxMetaspaceSize, scale);
+ out->cr();
+ out->print("UseCompressedClassPointers: %s", UseCompressedClassPointers ? "true" : "false");
+ out->cr();
+ out->print("CompressedClassSpaceSize: ");
+ print_scaled_bytes(out, CompressedClassSpaceSize, scale);
-// Dump global metaspace things from the end of ClassLoaderDataGraph
-void MetaspaceUtils::dump(outputStream* out) {
- out->print_cr("All Metaspace:");
- out->print("data space: "); print_on(out, Metaspace::NonClassType);
- out->print("class space: "); print_on(out, Metaspace::ClassType);
- print_waste(out);
-}
+ out->cr();
+ out->cr();
+
+} // MetaspaceUtils::print_report()
// Prints an ASCII representation of the given space.
void MetaspaceUtils::print_metaspace_map(outputStream* out, Metaspace::MetadataType mdtype) {
MutexLockerEx cl(MetaspaceExpand_lock, Mutex::_no_safepoint_check_flag);
const bool for_class = mdtype == Metaspace::ClassType ? true : false;
@@ -4239,57 +4541,43 @@
if (Metaspace::using_class_space()) {
Metaspace::chunk_manager_class()->verify();
}
}
-void MetaspaceUtils::verify_capacity() {
-#ifdef ASSERT
- size_t running_sum_capacity_bytes = capacity_bytes();
- // For purposes of the running sum of capacity, verify against capacity
- size_t capacity_in_use_bytes = capacity_bytes_slow();
- assert(running_sum_capacity_bytes == capacity_in_use_bytes,
- "capacity_words() * BytesPerWord " SIZE_FORMAT
- " capacity_bytes_slow()" SIZE_FORMAT,
- running_sum_capacity_bytes, capacity_in_use_bytes);
- for (Metaspace::MetadataType i = Metaspace::ClassType;
- i < Metaspace:: MetadataTypeCount;
- i = (Metaspace::MetadataType)(i + 1)) {
- size_t capacity_in_use_bytes = capacity_bytes_slow(i);
- assert(capacity_bytes(i) == capacity_in_use_bytes,
- "capacity_bytes(%u) " SIZE_FORMAT
- " capacity_bytes_slow(%u)" SIZE_FORMAT,
- i, capacity_bytes(i), i, capacity_in_use_bytes);
- }
-#endif
-}
-
-void MetaspaceUtils::verify_used() {
+void MetaspaceUtils::verify_metrics() {
#ifdef ASSERT
- size_t running_sum_used_bytes = used_bytes();
- // For purposes of the running sum of used, verify against used
- size_t used_in_use_bytes = used_bytes_slow();
- assert(used_bytes() == used_in_use_bytes,
- "used_bytes() " SIZE_FORMAT
- " used_bytes_slow()" SIZE_FORMAT,
- used_bytes(), used_in_use_bytes);
- for (Metaspace::MetadataType i = Metaspace::ClassType;
- i < Metaspace:: MetadataTypeCount;
- i = (Metaspace::MetadataType)(i + 1)) {
- size_t used_in_use_bytes = used_bytes_slow(i);
- assert(used_bytes(i) == used_in_use_bytes,
- "used_bytes(%u) " SIZE_FORMAT
- " used_bytes_slow(%u)" SIZE_FORMAT,
- i, used_bytes(i), i, used_in_use_bytes);
+ // Please note: there are time windows where the internal counters are out of sync with
+ // reality. For example, when a newly created ClassLoaderMetaspace creates its first chunk -
+ // the ClassLoaderMetaspace is not yet attached to its ClassLoaderData object and hence will
+ // not be counted when iterating the CLDG. So be careful when you call this method.
+ ClassLoaderMetaspaceStatistics total_stat;
+ collect_statistics(&total_stat);
+ UsedChunksStatistics nonclass_chunk_stat = total_stat.nonclass_sm_stats().totals();
+ UsedChunksStatistics class_chunk_stat = total_stat.class_sm_stats().totals();
+ bool mismatch =
+ _capacity_words[Metaspace::NonClassType] != nonclass_chunk_stat.cap() ||
+ _used_words[Metaspace::NonClassType] != nonclass_chunk_stat.used() ||
+ _capacity_words[Metaspace::ClassType] != class_chunk_stat.cap() ||
+ _used_words[Metaspace::ClassType] != class_chunk_stat.used();
+ if (mismatch) {
+ tty->print_cr("MetaspaceUtils::verify_metrics: counter mismatch.");
+ tty->print_cr("Expected: non-class cap: " SIZE_FORMAT ", non-class used: " SIZE_FORMAT
+ ", class cap: " SIZE_FORMAT ", class used: " SIZE_FORMAT ".",
+ _capacity_words[Metaspace::NonClassType], _used_words[Metaspace::NonClassType],
+ _capacity_words[Metaspace::ClassType], _used_words[Metaspace::ClassType]);
+ tty->print_cr("Got: non-class: ");
+ nonclass_chunk_stat.print_on(tty, sizeof(MetaWord));
+ tty->cr();
+ tty->print_cr(" class: ");
+ class_chunk_stat.print_on(tty, sizeof(MetaWord));
+ tty->cr();
+ tty->flush();
}
+ assert(mismatch == false, "MetaspaceUtils::verify_metrics: counter mismatch.");
#endif
}
-void MetaspaceUtils::verify_metrics() {
- verify_capacity();
- verify_used();
-}
-
// Metaspace methods
size_t Metaspace::_first_chunk_word_size = 0;
size_t Metaspace::_first_class_chunk_word_size = 0;
@@ -4708,13 +4996,12 @@
LogStream ls(log.debug());
loader_data->print_value_on(&ls);
}
}
LogStream ls(log.info());
- MetaspaceUtils::dump(&ls);
- MetaspaceUtils::print_metaspace_map(&ls, mdtype);
- ChunkManager::print_all_chunkmanagers(&ls);
+ // In case of an OOM, log out a short but still useful report.
+ MetaspaceUtils::print_report(&ls);
}
bool out_of_compressed_class_space = false;
if (is_class_space_allocation(mdtype)) {
ClassLoaderMetaspace* metaspace = loader_data->metaspace_non_null();
@@ -4785,20 +5072,27 @@
return get_space_list(NonClassType)->contains(ptr);
}
// ClassLoaderMetaspace
-ClassLoaderMetaspace::ClassLoaderMetaspace(Mutex* lock, Metaspace::MetaspaceType type) {
+ClassLoaderMetaspace::ClassLoaderMetaspace(Mutex* lock, Metaspace::MetaspaceType type)
+ : _lock(lock)
+ , _space_type(type)
+ , _vsm(NULL)
+ , _class_vsm(NULL)
+{
initialize(lock, type);
}
ClassLoaderMetaspace::~ClassLoaderMetaspace() {
+ DEBUG_ONLY(Atomic::inc(&g_internal_statistics.num_metaspace_deaths));
delete _vsm;
if (Metaspace::using_class_space()) {
delete _class_vsm;
}
}
+
void ClassLoaderMetaspace::initialize_first_chunk(Metaspace::MetaspaceType type, Metaspace::MetadataType mdtype) {
Metachunk* chunk = get_initialization_chunk(type, mdtype);
if (chunk != NULL) {
// Add to this manager's list of chunks in use and current_chunk().
get_space_manager(mdtype)->add_chunk(chunk, true);
@@ -4820,10 +5114,12 @@
}
void ClassLoaderMetaspace::initialize(Mutex* lock, Metaspace::MetaspaceType type) {
Metaspace::verify_global_initialization();
+ DEBUG_ONLY(Atomic::inc(&g_internal_statistics.num_metaspace_births));
+
// Allocate SpaceManager for metadata objects.
_vsm = new SpaceManager(Metaspace::NonClassType, type, lock);
if (Metaspace::using_class_space()) {
// Allocate SpaceManager for classes.
@@ -4841,10 +5137,13 @@
}
}
MetaWord* ClassLoaderMetaspace::allocate(size_t word_size, Metaspace::MetadataType mdtype) {
Metaspace::assert_not_frozen();
+
+ DEBUG_ONLY(Atomic::inc(&g_internal_statistics.num_allocs));
+
// Don't use class_vsm() unless UseCompressedClassPointers is true.
if (Metaspace::is_class_space_allocation(mdtype)) {
return class_vsm()->allocate(word_size);
} else {
return vsm()->allocate(word_size);
@@ -4876,48 +5175,10 @@
}
return res;
}
-size_t ClassLoaderMetaspace::used_words_slow(Metaspace::MetadataType mdtype) const {
- if (mdtype == Metaspace::ClassType) {
- return Metaspace::using_class_space() ? class_vsm()->sum_used_in_chunks_in_use() : 0;
- } else {
- return vsm()->sum_used_in_chunks_in_use(); // includes overhead!
- }
-}
-
-size_t ClassLoaderMetaspace::free_words_slow(Metaspace::MetadataType mdtype) const {
- Metaspace::assert_not_frozen();
- if (mdtype == Metaspace::ClassType) {
- return Metaspace::using_class_space() ? class_vsm()->sum_free_in_chunks_in_use() : 0;
- } else {
- return vsm()->sum_free_in_chunks_in_use();
- }
-}
-
-// Space capacity in the Metaspace. It includes
-// space in the list of chunks from which allocations
-// have been made. Don't include space in the global freelist and
-// in the space available in the dictionary which
-// is already counted in some chunk.
-size_t ClassLoaderMetaspace::capacity_words_slow(Metaspace::MetadataType mdtype) const {
- if (mdtype == Metaspace::ClassType) {
- return Metaspace::using_class_space() ? class_vsm()->sum_capacity_in_chunks_in_use() : 0;
- } else {
- return vsm()->sum_capacity_in_chunks_in_use();
- }
-}
-
-size_t ClassLoaderMetaspace::used_bytes_slow(Metaspace::MetadataType mdtype) const {
- return used_words_slow(mdtype) * BytesPerWord;
-}
-
-size_t ClassLoaderMetaspace::capacity_bytes_slow(Metaspace::MetadataType mdtype) const {
- return capacity_words_slow(mdtype) * BytesPerWord;
-}
-
size_t ClassLoaderMetaspace::allocated_blocks_bytes() const {
return vsm()->allocated_blocks_bytes() +
(Metaspace::using_class_space() ? class_vsm()->allocated_blocks_bytes() : 0);
}
@@ -4929,10 +5190,12 @@
void ClassLoaderMetaspace::deallocate(MetaWord* ptr, size_t word_size, bool is_class) {
Metaspace::assert_not_frozen();
assert(!SafepointSynchronize::is_at_safepoint()
|| Thread::current()->is_VM_thread(), "should be the VM thread");
+ DEBUG_ONLY(Atomic::inc(&g_internal_statistics.num_deallocs));
+
MutexLockerEx ml(vsm()->lock(), Mutex::_no_safepoint_check_flag);
if (is_class && Metaspace::using_class_space()) {
class_vsm()->deallocate(ptr, word_size);
} else {
@@ -4960,20 +5223,22 @@
if (Metaspace::using_class_space()) {
class_vsm()->verify();
}
}
-void ClassLoaderMetaspace::dump(outputStream* const out) const {
- out->print_cr("\nVirtual space manager: " INTPTR_FORMAT, p2i(vsm()));
- vsm()->dump(out);
+void ClassLoaderMetaspace::add_to_statistics_locked(ClassLoaderMetaspaceStatistics* out) const {
+ assert_lock_strong(lock());
+ vsm()->add_to_statistics_locked(&out->nonclass_sm_stats());
if (Metaspace::using_class_space()) {
- out->print_cr("\nClass space manager: " INTPTR_FORMAT, p2i(class_vsm()));
- class_vsm()->dump(out);
+ class_vsm()->add_to_statistics_locked(&out->class_sm_stats());
}
}
-
+void ClassLoaderMetaspace::add_to_statistics(ClassLoaderMetaspaceStatistics* out) const {
+ MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
+ add_to_statistics_locked(out);
+}
#ifdef ASSERT
static void do_verify_chunk(Metachunk* chunk) {
guarantee(chunk != NULL, "Sanity");
// Verify chunk itself; then verify that it is consistent with the
@@ -5315,16 +5580,16 @@
int num_humongous_chunks;
};
extern void test_metaspace_retrieve_chunkmanager_statistics(Metaspace::MetadataType mdType, chunkmanager_statistics_t* out) {
ChunkManager* const chunk_manager = Metaspace::get_chunk_manager(mdType);
- ChunkManager::ChunkManagerStatistics stat;
+ ChunkManagerStatistics stat;
chunk_manager->get_statistics(&stat);
- out->num_specialized_chunks = (int)stat.num_by_type[SpecializedIndex];
- out->num_small_chunks = (int)stat.num_by_type[SmallIndex];
- out->num_medium_chunks = (int)stat.num_by_type[MediumIndex];
- out->num_humongous_chunks = (int)stat.num_humongous_chunks;
+ out->num_specialized_chunks = (int)stat.chunk_stats(SpecializedIndex).num();
+ out->num_small_chunks = (int)stat.chunk_stats(SmallIndex).num();
+ out->num_medium_chunks = (int)stat.chunk_stats(MediumIndex).num();
+ out->num_humongous_chunks = (int)stat.chunk_stats(HumongousIndex).num();
}
struct chunk_geometry_t {
size_t specialized_chunk_word_size;
size_t small_chunk_word_size;
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