--- a/src/hotspot/share/memory/metachunk.hpp Thu May 03 17:36:25 2018 -0700
+++ b/src/hotspot/share/memory/metachunk.hpp Tue Apr 24 18:06:32 2018 +0200
@@ -110,6 +110,9 @@
size_t get_size_for_nonhumongous_chunktype(ChunkIndex chunk_type, bool is_class);
ChunkIndex get_chunk_type_by_size(size_t size, bool is_class);
+ChunkIndex next_chunk_index(ChunkIndex i);
+ChunkIndex prev_chunk_index(ChunkIndex i);
+
// Returns a descriptive name for a chunk type.
const char* chunk_size_name(ChunkIndex index);
@@ -184,7 +187,7 @@
// Alignment of each allocation in the chunks.
static size_t object_alignment();
- // Size of the Metachunk header, including alignment.
+ // Size of the Metachunk header, in words, including alignment.
static size_t overhead();
Metachunk(ChunkIndex chunktype, bool is_class, size_t word_size, VirtualSpaceNode* container);
--- a/src/hotspot/share/memory/metaspace.cpp Thu May 03 17:36:25 2018 -0700
+++ b/src/hotspot/share/memory/metaspace.cpp Tue Apr 24 18:06:32 2018 +0200
@@ -33,6 +33,8 @@
#include "memory/freeList.inline.hpp"
#include "memory/metachunk.hpp"
#include "memory/metaspace.hpp"
+#include "memory/metaspace/metaspaceCommon.hpp"
+#include "memory/metaspace/metaspaceStatistics.hpp"
#include "memory/metaspaceGCThresholdUpdater.hpp"
#include "memory/metaspaceShared.hpp"
#include "memory/metaspaceTracer.hpp"
@@ -43,14 +45,18 @@
#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"
#include "utilities/debug.hpp"
+#include "utilities/globalDefinitions.hpp"
#include "utilities/macros.hpp"
+using namespace metaspace::internals;
+
typedef BinaryTreeDictionary<Metablock, FreeList<Metablock> > BlockTreeDictionary;
typedef BinaryTreeDictionary<Metachunk, FreeList<Metachunk> > ChunkTreeDictionary;
@@ -70,6 +76,30 @@
DEBUG_ONLY(bool Metaspace::_frozen = false;)
+// Internal statistics.
+#ifdef ASSERT
+static struct {
+ // Number of allocations.
+ uintx num_allocs;
+ // Number of times a ClassLoaderMetaspace was born...
+ uintx num_metaspace_births;
+ // ... and 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
+ uintx num_deallocs;
+ // Number of deallocations triggered from outside ("real" deallocations).
+ uintx num_external_deallocs;
+ // Number of times an allocation was satisfied from deallocated blocks.
+ uintx num_allocs_from_deallocated_blocks;
+} g_internal_statistics;
+#endif
+
enum ChunkSizes { // in words.
ClassSpecializedChunk = 128,
SpecializedChunk = 128,
@@ -133,33 +163,33 @@
return (ChunkIndex)-1;
}
-
-static ChunkIndex next_chunk_index(ChunkIndex i) {
+ChunkIndex next_chunk_index(ChunkIndex i) {
assert(i < NumberOfInUseLists, "Out of bound");
return (ChunkIndex) (i+1);
}
-static ChunkIndex prev_chunk_index(ChunkIndex i) {
+ChunkIndex prev_chunk_index(ChunkIndex i) {
assert(i > ZeroIndex, "Out of bound");
return (ChunkIndex) (i-1);
}
-static const char* scale_unit(size_t scale) {
- switch(scale) {
- case 1: return "BYTES";
- case K: return "KB";
- case M: return "MB";
- case G: return "GB";
- default:
- ShouldNotReachHere();
- return NULL;
- }
+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;
+ default: ShouldNotReachHere();
+ }
+ return s;
}
volatile intptr_t MetaspaceGC::_capacity_until_GC = 0;
uint MetaspaceGC::_shrink_factor = 0;
bool MetaspaceGC::_should_concurrent_collect = false;
+
typedef class FreeList<Metachunk> ChunkList;
// Manages the global free lists of chunks.
@@ -240,19 +270,6 @@
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));
@@ -358,9 +375,9 @@
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);
+ // Fill in current statistic values to the given statistics object.
+ void collect_statistics(ChunkManagerStatistics* out) const;
+
};
class SmallBlocks : public CHeapObj<mtClass> {
@@ -384,6 +401,7 @@
}
}
+ // Returns the total size, in words, of all blocks, across all block sizes.
size_t total_size() const {
size_t result = 0;
for (uint i = _small_block_min_size; i < _small_block_max_size; i++) {
@@ -393,6 +411,16 @@
return result;
}
+ // Returns the total number of all blocks across all block sizes.
+ 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; }
@@ -445,6 +473,7 @@
MetaWord* get_block(size_t word_size);
void return_block(MetaWord* p, size_t word_size);
+ // Returns the total size, in words, of all blocks kept in this structure.
size_t total_size() const {
size_t result = dictionary()->total_size();
if (_small_blocks != NULL) {
@@ -453,6 +482,15 @@
return result;
}
+ // Returns the number of all blocks kept in this structure.
+ 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;
};
@@ -858,7 +896,8 @@
void retire(ChunkManager* chunk_manager);
- void print_on(outputStream* st) const;
+ void print_on(outputStream* st) const { print_on(st, K); }
+ void print_on(outputStream* st, size_t scale) const;
void print_map(outputStream* st, bool is_class) const;
// Debug support
@@ -876,6 +915,12 @@
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()) {
@@ -1182,7 +1227,8 @@
// Unlink empty VirtualSpaceNodes and free it.
void purge(ChunkManager* chunk_manager);
- void print_on(outputStream* st) const;
+ void print_on(outputStream* st) const { print_on(st, K); }
+ void print_on(outputStream* st, size_t scale) const;
void print_map(outputStream* st) const;
class VirtualSpaceListIterator : public StackObj {
@@ -1219,6 +1265,7 @@
int Metadebug::_allocation_fail_alot_count = 0;
+
// SpaceManager - used by Metaspace to handle allocations
class SpaceManager : public CHeapObj<mtClass> {
friend class ClassLoaderMetaspace;
@@ -1248,12 +1295,13 @@
// 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 all allocated chunks
- size_t _allocated_chunks_words;
- size_t _allocated_chunks_count;
+ // Some running counters, but lets keep their number small to not add to much to
+ // the per-classloader footprint.
+ // Note: capacity = used + free + waste + overhead. We do not keep running counters for
+ // free and waste. Their sum can be deduced from the three other values.
+ size_t _overhead_words;
+ size_t _capacity_words;
+ size_t _used_words;
// Free lists of blocks are per SpaceManager since they
// are assumed to be in chunks in use by the SpaceManager
@@ -1288,6 +1336,12 @@
Mutex* lock() const { return _lock; }
+ // Adds to the given statistic object. Expects to be locked with lock().
+ void add_to_statistics_locked(SpaceManagerStatistics* out) const;
+
+ // Verify internal counters against the current state. Expects to be locked with lock().
+ DEBUG_ONLY(void verify_metrics_locked() const;)
+
protected:
void initialize();
@@ -1318,25 +1372,21 @@
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_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(); }
- // Increment the per Metaspace and global running sums for Metachunks
- // by the given size. This is used when a Metachunk to added to
- // the in-use list.
- void inc_size_metrics(size_t words);
- // Increment the per Metaspace and global running sums Metablocks by the given
- // size. This is used when a Metablock is allocated.
- void inc_used_metrics(size_t words);
- // Delete the portion of the running sums for this SpaceManager. That is,
- // the globals running sums for the Metachunks and Metablocks are
- // decremented for all the Metachunks in-use by this SpaceManager.
- void dec_total_from_size_metrics();
+ size_t capacity_words() const { return _capacity_words; }
+ size_t used_words() const { return _used_words; }
+ size_t overhead_words() const { return _overhead_words; }
+
+ // Adjust local, global counters after a new chunk has been added.
+ void account_for_new_chunk(const Metachunk* new_chunk);
+
+ // Adjust local, global counters after space has been allocated from the current chunk.
+ void account_for_allocation(size_t words);
+
+ // Adjust global counters just before the SpaceManager dies, after all its chunks
+ // have been returned to the freelist.
+ void account_for_spacemanager_death();
// Adjust the initial chunk size to match one of the fixed chunk list sizes,
// or return the unadjusted size if the requested size is humongous.
@@ -1346,13 +1396,7 @@
// 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 once 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);
@@ -1381,15 +1425,11 @@
// 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.
@@ -1404,6 +1444,13 @@
return raw_word_size;
}
+
+ // Adds to the given statistic object.
+ void add_to_statistics(SpaceManagerStatistics* out) const;
+
+ // Verify internal counters against the current state.
+ DEBUG_ONLY(void verify_metrics() const;)
+
};
uint const SpaceManager::_small_chunk_limit = 4;
@@ -1658,6 +1705,7 @@
ls.print("VirtualSpaceNode::take_from_committed() not available " SIZE_FORMAT " words ", chunk_word_size);
// Dump some information about the virtual space that is nearly full
print_on(&ls);
+ ls.cr(); // ~LogStream does not autoflush.
}
return NULL;
}
@@ -1704,6 +1752,7 @@
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);
@@ -1763,15 +1812,22 @@
return result;
}
-void VirtualSpaceNode::print_on(outputStream* st) const {
- size_t used = used_words_in_vs();
- size_t capacity = capacity_words_in_vs();
+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()));
}
@@ -1993,6 +2049,7 @@
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.
@@ -2140,6 +2197,7 @@
// 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;
}
}
@@ -2163,6 +2221,7 @@
VirtualSpaceNode* vsl = current_virtual_space();
ResourceMark rm;
vsl->print_on(&ls);
+ ls.cr(); // ~LogStream does not autoflush.
}
}
@@ -2288,11 +2347,14 @@
return next;
}
-void VirtualSpaceList::print_on(outputStream* st) const {
+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);
}
}
@@ -2979,6 +3041,7 @@
p2i(this), p2i(chunk), chunk->word_size(), list_count);
ResourceMark rm;
locked_print_free_chunks(&ls);
+ ls.cr(); // ~LogStream does not autoflush.
}
return chunk;
@@ -3073,80 +3136,10 @@
_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::collect_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));
}
}
@@ -3202,77 +3195,6 @@
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);
@@ -3283,20 +3205,6 @@
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)) {
@@ -3428,24 +3336,9 @@
}
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,
@@ -3453,43 +3346,46 @@
Mutex* lock) :
_mdtype(mdtype),
_space_type(space_type),
- _allocated_blocks_words(0),
- _allocated_chunks_words(0),
- _allocated_chunks_count(0),
+ _capacity_words(0),
+ _used_words(0),
+ _overhead_words(0),
_block_freelists(NULL),
_lock(lock)
{
initialize();
}
-void SpaceManager::inc_size_metrics(size_t words) {
+void SpaceManager::account_for_new_chunk(const Metachunk* new_chunk) {
+
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
- // Metachunk is first added (so only added once per
- // Metachunk).
- MetaspaceUtils::inc_used(mdtype(), Metachunk::overhead());
+
+ _capacity_words += new_chunk->word_size();
+ _overhead_words += Metachunk::overhead();
+
+ // Adjust global counters:
+ MetaspaceUtils::inc_capacity(mdtype(), new_chunk->word_size());
+ MetaspaceUtils::inc_overhead(mdtype(), Metachunk::overhead());
}
-void SpaceManager::inc_used_metrics(size_t words) {
- // Add to the per SpaceManager total
- Atomic::add(words, &_allocated_blocks_words);
- // Add to the global total
+void SpaceManager::account_for_allocation(size_t words) {
+ // Note: we should be locked with the ClassloaderData-specific metaspace lock.
+ // We may or may not be locked with the global metaspace expansion lock.
+ assert_lock_strong(lock());
+
+ // Add to the per SpaceManager totals. This can be done non-atomically.
+ _used_words += words;
+
+ // Adjust global counters. This will be done atomically.
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::account_for_spacemanager_death() {
+
+ assert_lock_strong(MetaspaceExpand_lock);
+
+ MetaspaceUtils::dec_capacity(mdtype(), _capacity_words);
+ MetaspaceUtils::dec_overhead(mdtype(), _overhead_words);
+ MetaspaceUtils::dec_used(mdtype(), _used_words);
}
void SpaceManager::initialize() {
@@ -3502,23 +3398,16 @@
}
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();
+ account_for_spacemanager_death();
Log(gc, metaspace, freelist) log;
if (log.is_trace()) {
@@ -3529,6 +3418,7 @@
if (block_freelists() != NULL) {
block_freelists()->print_on(&ls);
}
+ ls.cr(); // ~LogStream does not autoflush.
}
// Add all the chunks in use by this space manager
@@ -3551,7 +3441,7 @@
}
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
@@ -3559,6 +3449,7 @@
_block_freelists = new BlockFreelist();
}
block_freelists()->return_block(p, raw_word_size);
+ DEBUG_ONLY(Atomic::inc(&g_internal_statistics.num_deallocs));
}
// Adds a chunk to the list of chunks in use.
@@ -3585,17 +3476,18 @@
new_chunk->set_next(chunks_in_use(index));
set_chunks_in_use(index, new_chunk);
- // Add to the running sum of capacity
- inc_size_metrics(new_chunk->word_size());
+ // Adjust counters.
+ account_for_new_chunk(new_chunk);
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::added chunk: ");
ResourceMark rm;
LogStream ls(log.trace());
new_chunk->print_on(&ls);
chunk_manager()->locked_print_free_chunks(&ls);
+ ls.cr(); // ~LogStream does not autoflush.
}
}
@@ -3605,7 +3497,7 @@
if (remaining_words >= SmallBlocks::small_block_min_size()) {
MetaWord* ptr = current_chunk()->allocate(remaining_words);
deallocate(ptr, remaining_words);
- inc_used_metrics(remaining_words);
+ account_for_allocation(remaining_words);
}
}
}
@@ -3633,6 +3525,9 @@
size_t raw_word_size = get_allocation_word_size(word_size);
BlockFreelist* fl = block_freelists();
MetaWord* p = NULL;
+
+ DEBUG_ONLY(if (VerifyMetaspace) verify_metrics_locked());
+
// Allocation from the dictionary is expensive in the sense that
// the dictionary has to be searched for a size. Don't allocate
// from the dictionary until it starts to get fat. Is this
@@ -3640,6 +3535,9 @@
// 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);
@@ -3651,7 +3549,7 @@
// 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;
@@ -3669,7 +3567,7 @@
}
if (result != NULL) {
- inc_used_metrics(word_size);
+ account_for_allocation(word_size);
assert(result != (MetaWord*) chunks_in_use(MediumIndex),
"Head of the list is being allocated");
}
@@ -3697,162 +3595,129 @@
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_overhead(Metachunk::overhead());
+ chunk_stat.add_used(chunk->used_word_size() - Metachunk::overhead());
+ 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_info(block_freelists()->num_blocks(), block_freelists()->total_size());
+ }
}
-#endif
-
-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();;
- }
- }
-
- if (log_is_enabled(Trace, gc, metaspace, freelist)) {
- if (block_freelists() != NULL) block_freelists()->print_on(out);
- }
-
- size_t free = current_chunk() == NULL ? 0 : current_chunk()->free_word_size();
- // Free space isn't wasted.
- waste -= free;
-
- 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::add_to_statistics(SpaceManagerStatistics* out) const {
+ MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
+ add_to_statistics_locked(out);
}
+#ifdef ASSERT
+void SpaceManager::verify_metrics_locked() const {
+ assert_lock_strong(lock());
+
+ SpaceManagerStatistics stat;
+ add_to_statistics_locked(&stat);
+
+ UsedChunksStatistics chunk_stats = stat.totals();
+
+ DEBUG_ONLY(chunk_stats.check_sanity());
+
+ assert_counter(_capacity_words, chunk_stats.cap(), "SpaceManager::_capacity_words");
+ assert_counter(_used_words, chunk_stats.used(), "SpaceManager::_used_words");
+ assert_counter(_overhead_words, chunk_stats.overhead(), "SpaceManager::_overhead_words");
+}
+
+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};
-
-size_t MetaspaceUtils::free_bytes(Metaspace::MetadataType mdtype) {
+size_t MetaspaceUtils::_capacity_words [Metaspace:: MetadataTypeCount] = {0, 0};
+size_t MetaspaceUtils::_overhead_words [Metaspace:: MetadataTypeCount] = {0, 0};
+volatile size_t MetaspaceUtils::_used_words [Metaspace:: MetadataTypeCount] = {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_in_vs_bytes(Metaspace::MetadataType mdtype) {
VirtualSpaceList* list = Metaspace::get_space_list(mdtype);
return list == NULL ? 0 : list->free_bytes();
}
-size_t MetaspaceUtils::free_bytes() {
- return free_bytes(Metaspace::ClassType) + free_bytes(Metaspace::NonClassType);
+size_t MetaspaceUtils::free_in_vs_bytes() {
+ return free_in_vs_bytes(Metaspace::ClassType) + free_in_vs_bytes(Metaspace::NonClassType);
+}
+
+static void inc_stat_nonatomically(size_t* pstat, size_t words) {
+ assert_lock_strong(MetaspaceExpand_lock);
+ (*pstat) += words;
+}
+
+static void dec_stat_nonatomically(size_t* pstat, size_t words) {
+ assert_lock_strong(MetaspaceExpand_lock);
+ const size_t size_now = *pstat;
+ assert(size_now >= words, "About to decrement counter below zero "
+ "(current value: " SIZE_FORMAT ", decrement value: " SIZE_FORMAT ".",
+ size_now, words);
+ *pstat = size_now - words;
+}
+
+static void inc_stat_atomically(volatile size_t* pstat, size_t words) {
+ Atomic::add(words, pstat);
+}
+
+static void dec_stat_atomically(volatile size_t* pstat, size_t words) {
+ const size_t size_now = *pstat;
+ assert(size_now >= words, "About to decrement counter below zero "
+ "(current value: " SIZE_FORMAT ", decrement value: " SIZE_FORMAT ".",
+ size_now, words);
+ Atomic::sub(words, pstat);
}
void MetaspaceUtils::dec_capacity(Metaspace::MetadataType mdtype, size_t words) {
- 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;
+ dec_stat_nonatomically(&_capacity_words[mdtype], words);
}
-
void MetaspaceUtils::inc_capacity(Metaspace::MetadataType mdtype, size_t words) {
- assert_lock_strong(MetaspaceExpand_lock);
- // Needs to be atomic
- _capacity_words[mdtype] += words;
+ inc_stat_nonatomically(&_capacity_words[mdtype], words);
}
-
void MetaspaceUtils::dec_used(Metaspace::MetadataType mdtype, size_t words) {
- assert(words <= used_words(mdtype),
- "About to decrement below 0: words " SIZE_FORMAT
- " is greater than _used_words[%u] " SIZE_FORMAT,
- words, mdtype, used_words(mdtype));
- // For CMS deallocation of the Metaspaces occurs during the
- // sweep which is a concurrent phase. Protection by the MetaspaceExpand_lock
- // is not enough since allocation is on a per Metaspace basis
- // and protected by the Metaspace lock.
- Atomic::sub(words, &_used_words[mdtype]);
-}
-
-void MetaspaceUtils::inc_used(Metaspace::MetadataType mdtype, size_t words) {
- // _used_words tracks allocations for
- // each piece of metadata. Those allocations are
- // 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;
+ dec_stat_atomically(&_used_words[mdtype], words);
}
-
-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;
+void MetaspaceUtils::inc_used(Metaspace::MetadataType mdtype, size_t words) {
+ inc_stat_atomically(&_used_words[mdtype], words);
}
-
-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;
+void MetaspaceUtils::dec_overhead(Metaspace::MetadataType mdtype, size_t words) {
+ dec_stat_nonatomically(&_overhead_words[mdtype], words);
}
-
-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;
+void MetaspaceUtils::inc_overhead(Metaspace::MetadataType mdtype, size_t words) {
+ inc_stat_nonatomically(&_overhead_words[mdtype], words);
}
size_t MetaspaceUtils::reserved_bytes(Metaspace::MetadataType mdtype) {
@@ -3934,280 +3799,386 @@
}
}
-// 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;
-};
-
-
-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;
+ ClassLoaderMetaspaceStatistics _stats_total;
+
+ 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(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) {
return;
}
- bool anonymous = false;
- if (cld->is_anonymous()) {
- _out->print_cr("ClassLoader: for anonymous class");
- anonymous = true;
- } else {
- ResourceMark rm;
- _out->print_cr("ClassLoader: %s", cld->loader_name());
+ // 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 ++;
+ _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);
+
+ if (cld->is_anonymous()) {
+ _out->print("ClassLoaderData " PTR_FORMAT " for anonymous class", p2i(cld));
+ } else {
+ ResourceMark rm;
+ _out->print("ClassLoaderData " PTR_FORMAT " for %s", p2i(cld), cld->loader_name());
+ }
+
+ if (cld->is_unloading()) {
+ _out->print(" (unloading)");
+ }
+
+ this_cld_stat.print_on(_out, _scale, _break_down_by_chunktype);
+ _out->cr();
+
}
- print_metaspace(msp, anonymous);
- _out->cr();
- }
-
-private:
- void print_metaspace(ClassLoaderMetaspace* msp, bool anonymous);
- void print_summary() const;
+ } // do_cld
+
};
-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);
- }
-
- _out->print(" Metadata ");
- metadata_stats.print_on(_out, _scale);
+void MetaspaceUtils::print_vs(outputStream* out, size_t scale) {
+ const size_t reserved_nonclass_words = reserved_bytes(Metaspace::NonClassType) / sizeof(MetaWord);
+ const size_t committed_nonclass_words = committed_bytes(Metaspace::NonClassType) / sizeof(MetaWord);
+ {
+ if (Metaspace::using_class_space()) {
+ out->print(" 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_cr(" committed ");
+
+ if (Metaspace::using_class_space()) {
+ const size_t reserved_class_words = reserved_bytes(Metaspace::ClassType) / sizeof(MetaWord);
+ const size_t committed_class_words = committed_bytes(Metaspace::ClassType) / sizeof(MetaWord);
+ out->print(" Class space: ");
+ print_scaled_words(out, reserved_class_words, scale, 7);
+ out->print(" reserved, ");
+ print_scaled_words_and_percentage(out, committed_class_words, reserved_class_words, scale, 7);
+ out->print_cr(" committed ");
+
+ const size_t reserved_words = reserved_nonclass_words + reserved_class_words;
+ const size_t committed_words = committed_nonclass_words + committed_class_words;
+ out->print(" Both: ");
+ 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_cr(" committed ");
+ }
+ }
+}
+
+// This will print out a basic metaspace usage report but
+// unlike print_report() is guaranteed not to lock or to walk the CLDG.
+void MetaspaceUtils::print_basic_report(outputStream* out, size_t scale) {
+
+ out->cr();
+ out->print_cr("Usage:");
if (Metaspace::using_class_space()) {
- vsm = msp->class_vsm();
-
- 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);
-
- if (anonymous) {
- _total_anon_class.add(class_stats);
- }
-
- _out->print(" Class data ");
- class_stats.print_on(_out, _scale);
- }
-}
-
-void PrintCLDMetaspaceInfoClosure::print_summary() const {
- const char* unit = scale_unit(_scale);
- _out->cr();
- _out->print_cr("Summary:");
-
- MetadataStats total;
- total.add(_total_metadata);
- total.add(_total_class);
-
- _out->print(" Total class loaders=" SIZE_FORMAT_W(6) " ", _total_count);
- total.print_on(_out, _scale);
-
- _out->print(" Metadata ");
- _total_metadata.print_on(_out, _scale);
+ out->print(" Non-class: ");
+ }
+
+ // In its most basic form, we do not require walking the CLDG. Instead, just print the running totals from
+ // MetaspaceUtils.
+ const size_t cap_nc = MetaspaceUtils::capacity_words(Metaspace::NonClassType);
+ const size_t overhead_nc = MetaspaceUtils::overhead_words(Metaspace::NonClassType);
+ const size_t used_nc = MetaspaceUtils::used_words(Metaspace::NonClassType);
+ const size_t free_and_waste_nc = cap_nc - overhead_nc - used_nc;
+
+ print_scaled_words(out, cap_nc, scale, 5);
+ out->print(" capacity, ");
+ print_scaled_words_and_percentage(out, used_nc, cap_nc, scale, 5);
+ out->print(" used, ");
+ print_scaled_words_and_percentage(out, free_and_waste_nc, cap_nc, scale, 5);
+ out->print(" free+waste, ");
+ print_scaled_words_and_percentage(out, overhead_nc, cap_nc, scale, 5);
+ out->print(" overhead. ");
+ out->cr();
if (Metaspace::using_class_space()) {
- _out->print(" Class data ");
- _total_class.print_on(_out, _scale);
- }
- _out->cr();
-
- MetadataStats total_anon;
- total_anon.add(_total_anon_metadata);
- total_anon.add(_total_anon_class);
-
- _out->print("For anonymous classes=" SIZE_FORMAT_W(6) " ", _total_anon_count);
- total_anon.print_on(_out, _scale);
-
- _out->print(" Metadata ");
- _total_anon_metadata.print_on(_out, _scale);
-
- if (Metaspace::using_class_space()) {
- _out->print(" Class data ");
- _total_anon_class.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);
+ const size_t cap_c = MetaspaceUtils::capacity_words(Metaspace::ClassType);
+ const size_t overhead_c = MetaspaceUtils::overhead_words(Metaspace::ClassType);
+ const size_t used_c = MetaspaceUtils::used_words(Metaspace::ClassType);
+ const size_t free_and_waste_c = cap_c - overhead_c - used_c;
+ out->print(" Class: ");
+ print_scaled_words(out, cap_c, scale, 5);
+ out->print(" capacity, ");
+ print_scaled_words_and_percentage(out, used_c, cap_c, scale, 5);
+ out->print(" used, ");
+ print_scaled_words_and_percentage(out, free_and_waste_c, cap_c, scale, 5);
+ out->print(" free+waste, ");
+ print_scaled_words_and_percentage(out, overhead_c, cap_c, scale, 5);
+ out->print(" overhead. ");
+ out->cr();
+
+ out->print(" Both: ");
+ const size_t cap = cap_nc + cap_c;
+
+ print_scaled_words(out, cap, scale, 5);
+ out->print(" capacity, ");
+ print_scaled_words_and_percentage(out, used_nc + used_c, cap, scale, 5);
+ out->print(" used, ");
+ print_scaled_words_and_percentage(out, free_and_waste_nc + free_and_waste_c, cap, scale, 5);
+ out->print(" free+waste, ");
+ print_scaled_words_and_percentage(out, overhead_nc + overhead_c, cap, scale, 5);
+ out->print(" overhead. ");
+ out->cr();
}
out->cr();
- ChunkManager::print_all_chunkmanagers(out, scale);
+ out->print_cr("Virtual space:");
+
+ print_vs(out, scale);
out->cr();
- out->print_cr("Per-classloader metadata:");
+ out->print_cr("Chunk freelists:");
+
+ if (Metaspace::using_class_space()) {
+ out->print(" Non-Class: ");
+ }
+ print_human_readable_size(out, Metaspace::chunk_manager_metadata()->free_chunks_total_words(), scale);
out->cr();
-
- PrintCLDMetaspaceInfoClosure cl(out, scale);
- ClassLoaderDataGraph::cld_do(&cl);
+ if (Metaspace::using_class_space()) {
+ out->print(" Class: ");
+ print_human_readable_size(out, Metaspace::chunk_manager_class()->free_chunks_total_words(), scale);
+ out->cr();
+ out->print(" Both: ");
+ print_human_readable_size(out, Metaspace::chunk_manager_class()->free_chunks_total_words() +
+ Metaspace::chunk_manager_metadata()->free_chunks_total_words(), scale);
+ out->cr();
+ }
+ out->cr();
+
}
-
-// 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);
-}
+void MetaspaceUtils::print_report(outputStream* out, size_t scale, int flags) {
+
+ 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;
+
+ // 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();
+ }
+
+ ClassLoaderDataGraph::cld_do(&cl); // collect data and optionally print
+
+ // 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 " loader%s)%c",
+ space_type_name((Metaspace::MetaspaceType)space_type),
+ num, (num == 1 ? "" : "s"), (num > 0 ? ':' : '.'));
+ if (num > 0) {
+ cl._stats_by_spacetype[space_type].print_on(out, scale, print_by_chunktype);
+ }
+ out->cr();
+ }
+ }
+
+ // Print totals for in-use data:
+ out->cr();
+ out->print_cr("Total Usage ( " UINTX_FORMAT " loader%s)%c",
+ cl._num_loaders, (cl._num_loaders == 1 ? "" : "s"), (cl._num_loaders > 0 ? ':' : '.'));
+
+ cl._stats_total.print_on(out, scale, print_by_chunktype);
+
+ // -- Print Virtual space.
+ out->cr();
+ out->print_cr("Virtual space:");
+
+ print_vs(out, scale);
+
+ // -- Print VirtualSpaceList details.
+ if ((flags & rf_show_vslist) > 0) {
+ out->cr();
+ out->print_cr("Virtual space list%s:", Metaspace::using_class_space() ? "s" : "");
+
+ 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();
+
+ // -- Print VirtualSpaceList map.
+ if ((flags & rf_show_vsmap) > 0) {
+ out->cr();
+ out->print_cr("Virtual space map:");
+
+ 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_cr("Chunk freelist%s:", Metaspace::using_class_space() ? "s" : "");
+
+ ChunkManagerStatistics non_class_cm_stat;
+ Metaspace::chunk_manager_metadata()->collect_statistics(&non_class_cm_stat);
+
+ if (Metaspace::using_class_space()) {
+ out->print_cr(" Non-Class:");
+ }
+ non_class_cm_stat.print_on(out, scale);
+
+ if (Metaspace::using_class_space()) {
+ ChunkManagerStatistics class_cm_stat;
+ Metaspace::chunk_manager_class()->collect_statistics(&class_cm_stat);
+ out->print_cr(" Class:");
+ class_cm_stat.print_on(out, scale);
+ }
+
+ // As a convenience, print a summary of common waste.
+ out->cr();
+ out->print("Waste ");
+ // For all wastages, print percentages from total. As total use the total size of memory committed for metaspace.
+ const size_t committed_words = committed_bytes() / BytesPerWord;
+
+ out->print("(percentages refer to total committed size ");
+ print_scaled_words(out, committed_words, scale);
+ out->print_cr("):");
+
+ // Print space committed but not yet used by any class loader
+ const size_t unused_words_in_vs = MetaspaceUtils::free_in_vs_bytes() / BytesPerWord;
+ out->print(" Committed unused: ");
+ print_scaled_words_and_percentage(out, unused_words_in_vs, committed_words, scale, 6);
+ out->cr();
+
+ // Print waste for in-use chunks.
+ 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();
+ out->print(" Free in chunks in use: ");
+ print_scaled_words_and_percentage(out, ucs_all.free(), committed_words, scale, 6);
+ out->cr();
+ out->print(" Overhead in chunks in use: ");
+ print_scaled_words_and_percentage(out, ucs_all.overhead(), committed_words, scale, 6);
+ out->cr();
+
+ // Print waste in free chunks.
+ const size_t total_capacity_in_free_chunks =
+ Metaspace::chunk_manager_metadata()->free_chunks_total_words() +
+ (Metaspace::using_class_space() ? Metaspace::chunk_manager_class()->free_chunks_total_words() : 0);
+ out->print(" In free chunks: ");
+ print_scaled_words_and_percentage(out, total_capacity_in_free_chunks, committed_words, scale, 6);
+ out->cr();
+
+ // Print waste in deallocated blocks.
+ 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: ");
+ print_scaled_words_and_percentage(out, free_blocks_cap_words, committed_words, scale, 6);
+ out->print(" ("UINTX_FORMAT " blocks)", free_blocks_num);
+ out->cr();
+
+ // Print total waste.
+ const size_t total_waste = ucs_all.waste() + ucs_all.free() + ucs_all.overhead() + total_capacity_in_free_chunks
+ + free_blocks_cap_words + unused_words_in_vs;
+ out->print(" -total-: ");
+ print_scaled_words_and_percentage(out, total_waste, committed_words, scale, 6);
+ out->cr();
+
+ // 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 deallocations: " UINTX_FORMAT " (" UINTX_FORMAT " external).", g_internal_statistics.num_deallocs, g_internal_statistics.num_external_deallocs);
+ out->print_cr("Allocations 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_human_readable_size(out, MaxMetaspaceSize, scale);
+ out->cr();
+ out->print("InitialBootClassLoaderMetaspaceSize: ");
+ print_human_readable_size(out, InitialBootClassLoaderMetaspaceSize, scale);
+ out->cr();
+
+ out->print("UseCompressedClassPointers: %s", UseCompressedClassPointers ? "true" : "false");
+ out->cr();
+ if (Metaspace::using_class_space()) {
+ out->print("CompressedClassSpaceSize: ");
+ print_human_readable_size(out, CompressedClassSpaceSize, scale);
+ }
+
+ 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) {
@@ -4241,53 +4212,37 @@
}
}
-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 = false;
+ for (int i = 0; i < Metaspace::MetadataTypeCount; i ++) {
+ Metaspace::MetadataType mdtype = (Metaspace::MetadataType)i;
+ UsedChunksStatistics chunk_stat = total_stat.sm_stats(mdtype).totals();
+ if (capacity_words(mdtype) != chunk_stat.cap() ||
+ used_words(mdtype) != chunk_stat.used() ||
+ overhead_words(mdtype) != chunk_stat.overhead()) {
+ mismatch = true;
+ tty->print_cr("MetaspaceUtils::verify_metrics: counter mismatch for mdtype=%u:", mdtype);
+ tty->print_cr("Expected cap " SIZE_FORMAT ", used " SIZE_FORMAT ", overhead " SIZE_FORMAT ".",
+ capacity_words(mdtype), used_words(mdtype), overhead_words(mdtype));
+ tty->print_cr("Got cap " SIZE_FORMAT ", used " SIZE_FORMAT ", overhead " SIZE_FORMAT ".",
+ chunk_stat.cap(), chunk_stat.used(), chunk_stat.overhead());
+ tty->flush();
+ }
+ }
+ assert(mismatch == false, "MetaspaceUtils::verify_metrics: counter mismatch.");
#endif
}
-void MetaspaceUtils::verify_metrics() {
- verify_capacity();
- verify_used();
-}
-
// Metaspace methods
@@ -4486,6 +4441,7 @@
ResourceMark rm;
LogStream ls(lt);
print_compressed_class_space(&ls, requested_addr);
+ ls.cr(); // ~LogStream does not autoflush.
}
}
@@ -4707,12 +4663,13 @@
if (loader_data->metaspace_or_null() != NULL) {
LogStream ls(log.debug());
loader_data->print_value_on(&ls);
+ ls.cr(); // ~LogStream does not autoflush.
}
}
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_basic_report(&ls, 0);
+ ls.cr(); // ~LogStream does not autoflush.
}
bool out_of_compressed_class_space = false;
@@ -4787,16 +4744,23 @@
// 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) {
@@ -4822,6 +4786,8 @@
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);
@@ -4843,6 +4809,9 @@
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);
@@ -4878,52 +4847,14 @@
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);
+ return (vsm()->used_words() +
+ (Metaspace::using_class_space() ? class_vsm()->used_words() : 0)) * BytesPerWord;
}
size_t ClassLoaderMetaspace::allocated_chunks_bytes() const {
- return vsm()->allocated_chunks_bytes() +
- (Metaspace::using_class_space() ? class_vsm()->allocated_chunks_bytes() : 0);
+ return (vsm()->capacity_words() +
+ (Metaspace::using_class_space() ? class_vsm()->capacity_words() : 0)) * BytesPerWord;
}
void ClassLoaderMetaspace::deallocate(MetaWord* ptr, size_t word_size, bool is_class) {
@@ -4931,6 +4862,8 @@
assert(!SafepointSynchronize::is_at_safepoint()
|| Thread::current()->is_VM_thread(), "should be the VM thread");
+ DEBUG_ONLY(Atomic::inc(&g_internal_statistics.num_external_deallocs));
+
MutexLockerEx ml(vsm()->lock(), Mutex::_no_safepoint_check_flag);
if (is_class && Metaspace::using_class_space()) {
@@ -4962,16 +4895,18 @@
}
}
-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) {
@@ -5317,12 +5252,12 @@
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;
- 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;
+ ChunkManagerStatistics stat;
+ chunk_manager->collect_statistics(&stat);
+ 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 {
--- a/src/hotspot/share/memory/metaspace.hpp Thu May 03 17:36:25 2018 -0700
+++ b/src/hotspot/share/memory/metaspace.hpp Tue Apr 24 18:06:32 2018 +0200
@@ -68,6 +68,11 @@
class VirtualSpaceList;
class CollectedHeap;
+namespace metaspace {
+namespace internals {
+ class ClassLoaderMetaspaceStatistics;
+}}
+
// Metaspaces each have a SpaceManager and allocations
// are done by the SpaceManager. Allocations are done
// out of the current Metachunk. When the current Metachunk
@@ -94,10 +99,12 @@
MetadataTypeCount
};
enum MetaspaceType {
- StandardMetaspaceType,
- BootMetaspaceType,
- AnonymousMetaspaceType,
- ReflectionMetaspaceType
+ ZeroMetaspaceType = 0,
+ StandardMetaspaceType = ZeroMetaspaceType,
+ BootMetaspaceType = StandardMetaspaceType + 1,
+ AnonymousMetaspaceType = BootMetaspaceType + 1,
+ ReflectionMetaspaceType = AnonymousMetaspaceType + 1,
+ MetaspaceTypeCount
};
private:
@@ -193,7 +200,6 @@
static MetaWord* allocate(ClassLoaderData* loader_data, size_t word_size,
MetaspaceObj::Type type, TRAPS);
- void deallocate(MetaWord* ptr, size_t byte_size, bool is_class);
static bool contains(const void* ptr);
static bool contains_non_shared(const void* ptr);
@@ -238,96 +244,97 @@
void initialize_first_chunk(Metaspace::MetaspaceType type, Metaspace::MetadataType mdtype);
Metachunk* get_initialization_chunk(Metaspace::MetaspaceType type, Metaspace::MetadataType mdtype);
+ const Metaspace::MetaspaceType _space_type;
+ Mutex* const _lock;
SpaceManager* _vsm;
+ SpaceManager* _class_vsm;
+
SpaceManager* vsm() const { return _vsm; }
-
- SpaceManager* _class_vsm;
SpaceManager* class_vsm() const { return _class_vsm; }
SpaceManager* get_space_manager(Metaspace::MetadataType mdtype) {
assert(mdtype != Metaspace::MetadataTypeCount, "MetadaTypeCount can't be used as mdtype");
return mdtype == Metaspace::ClassType ? class_vsm() : vsm();
}
+ Mutex* lock() const { return _lock; }
+
MetaWord* expand_and_allocate(size_t size, Metaspace::MetadataType mdtype);
size_t class_chunk_size(size_t word_size);
+ // Adds to the given statistic object. Must be locked with CLD metaspace lock.
+ void add_to_statistics_locked(metaspace::internals::ClassLoaderMetaspaceStatistics* out) const;
+
public:
ClassLoaderMetaspace(Mutex* lock, Metaspace::MetaspaceType type);
~ClassLoaderMetaspace();
+ Metaspace::MetaspaceType space_type() const { return _space_type; }
+
// Allocate space for metadata of type mdtype. This is space
// within a Metachunk and is used by
// allocate(ClassLoaderData*, size_t, bool, MetadataType, TRAPS)
MetaWord* allocate(size_t word_size, Metaspace::MetadataType mdtype);
- size_t used_words_slow(Metaspace::MetadataType mdtype) const;
- size_t free_words_slow(Metaspace::MetadataType mdtype) const;
- size_t capacity_words_slow(Metaspace::MetadataType mdtype) const;
-
- size_t used_bytes_slow(Metaspace::MetadataType mdtype) const;
- size_t capacity_bytes_slow(Metaspace::MetadataType mdtype) const;
-
size_t allocated_blocks_bytes() const;
size_t allocated_chunks_bytes() const;
void deallocate(MetaWord* ptr, size_t byte_size, bool is_class);
- void dump(outputStream* const out) const;
-
void print_on(outputStream* st) const;
// Debugging support
void verify();
+ // Adds to the given statistic object. Will lock with CLD metaspace lock.
+ void add_to_statistics(metaspace::internals::ClassLoaderMetaspaceStatistics* out) const;
+
}; // ClassLoaderMetaspace
+class MetaspaceUtils : AllStatic {
-class MetaspaceUtils : AllStatic {
+ // Spacemanager updates running counters.
+ friend class SpaceManager;
+
+ // Running counters for statistics concerning in-use chunks.
+ // Note: capacity = used + free + waste + overhead. Note that we do not
+ // count free and waste. Their sum can be deduces from the three other values.
+ // For more details, one should call print_report() from within a safe point.
+ static size_t _capacity_words [Metaspace:: MetadataTypeCount];
+ static size_t _overhead_words [Metaspace:: MetadataTypeCount];
+ static volatile size_t _used_words [Metaspace:: MetadataTypeCount];
+
+ // Atomically decrement or increment in-use statistic counters
+ static void dec_capacity(Metaspace::MetadataType mdtype, size_t words);
+ static void inc_capacity(Metaspace::MetadataType mdtype, size_t words);
+ static void dec_used(Metaspace::MetadataType mdtype, size_t words);
+ static void inc_used(Metaspace::MetadataType mdtype, size_t words);
+ static void dec_overhead(Metaspace::MetadataType mdtype, size_t words);
+ static void inc_overhead(Metaspace::MetadataType mdtype, size_t words);
+
+
+ // Getters for the in-use counters.
+ static size_t capacity_words(Metaspace::MetadataType mdtype) { return _capacity_words[mdtype]; }
+ static size_t used_words(Metaspace::MetadataType mdtype) { return _used_words[mdtype]; }
+ static size_t overhead_words(Metaspace::MetadataType mdtype) { return _overhead_words[mdtype]; }
+
static size_t free_chunks_total_words(Metaspace::MetadataType mdtype);
- // These methods iterate over the classloader data graph
- // for the given Metaspace type. These are slow.
- static size_t used_bytes_slow(Metaspace::MetadataType mdtype);
- static size_t free_bytes_slow(Metaspace::MetadataType mdtype);
- static size_t capacity_bytes_slow(Metaspace::MetadataType mdtype);
- static size_t capacity_bytes_slow();
+ // Helper for print_xx_report.
+ static void print_vs(outputStream* out, size_t scale);
- // Running sum of space in all Metachunks that has been
- // allocated to a Metaspace. This is used instead of
- // iterating over all the classloaders. One for each
- // type of Metadata
- static size_t _capacity_words[Metaspace:: MetadataTypeCount];
- // Running sum of space in all Metachunks that
- // are being used for metadata. One for each
- // type of Metadata.
- static volatile size_t _used_words[Metaspace:: MetadataTypeCount];
+public:
- public:
- // Decrement and increment _allocated_capacity_words
- static void dec_capacity(Metaspace::MetadataType type, size_t words);
- static void inc_capacity(Metaspace::MetadataType type, size_t words);
-
- // Decrement and increment _allocated_used_words
- static void dec_used(Metaspace::MetadataType type, size_t words);
- static void inc_used(Metaspace::MetadataType type, size_t words);
-
- // Total of space allocated to metadata in all Metaspaces.
- // This sums the space used in each Metachunk by
- // iterating over the classloader data graph
- static size_t used_bytes_slow() {
- return used_bytes_slow(Metaspace::ClassType) +
- used_bytes_slow(Metaspace::NonClassType);
- }
+ // 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.
+ static void collect_statistics(metaspace::internals::ClassLoaderMetaspaceStatistics* out);
// Used by MetaspaceCounters
static size_t free_chunks_total_words();
static size_t free_chunks_total_bytes();
static size_t free_chunks_total_bytes(Metaspace::MetadataType mdtype);
- static size_t capacity_words(Metaspace::MetadataType mdtype) {
- return _capacity_words[mdtype];
- }
static size_t capacity_words() {
return capacity_words(Metaspace::NonClassType) +
capacity_words(Metaspace::ClassType);
@@ -339,9 +346,6 @@
return capacity_words() * BytesPerWord;
}
- static size_t used_words(Metaspace::MetadataType mdtype) {
- return _used_words[mdtype];
- }
static size_t used_words() {
return used_words(Metaspace::NonClassType) +
used_words(Metaspace::ClassType);
@@ -353,8 +357,9 @@
return used_words() * BytesPerWord;
}
- static size_t free_bytes();
- static size_t free_bytes(Metaspace::MetadataType mdtype);
+ // Space committed but yet unclaimed by any class loader.
+ static size_t free_in_vs_bytes();
+ static size_t free_in_vs_bytes(Metaspace::MetadataType mdtype);
static size_t reserved_bytes(Metaspace::MetadataType mdtype);
static size_t reserved_bytes() {
@@ -373,7 +378,29 @@
return min_chunk_size_words() * BytesPerWord;
}
- static void print_metadata_for_nmt(outputStream* out, size_t scale = K);
+ // Flags for print_report().
+ enum ReportFlag {
+ // Show usage by class loader.
+ rf_show_loaders = (1 << 0),
+ // Breaks report down by chunk type (small, medium, ...).
+ rf_break_down_by_chunktype = (1 << 1),
+ // Breaks report down by space type (anonymous, reflection, ...).
+ rf_break_down_by_spacetype = (1 << 2),
+ // Print details about the underlying virtual spaces.
+ rf_show_vslist = (1 << 3),
+ // Print metaspace map.
+ rf_show_vsmap = (1 << 4)
+ };
+
+ // This will print out a basic metaspace usage report but
+ // unlike print_report() is guaranteed not to lock or to walk the CLDG.
+ static void print_basic_report(outputStream* st, size_t scale);
+
+ // Prints a report about the current metaspace state.
+ // Optional parts can be enabled via flags.
+ // Function will walk the CLDG and will lock the expand lock; if that is not
+ // convenient, use print_basic_report() instead.
+ static void print_report(outputStream* out, size_t scale = 0, int flags = 0);
static bool has_chunk_free_list(Metaspace::MetadataType mdtype);
static MetaspaceChunkFreeListSummary chunk_free_list_summary(Metaspace::MetadataType mdtype);
@@ -381,20 +408,13 @@
// Print change in used metadata.
static void print_metaspace_change(size_t prev_metadata_used);
static void print_on(outputStream * out);
- static void print_on(outputStream * out, Metaspace::MetadataType mdtype);
-
- static void print_class_waste(outputStream* out);
- static void print_waste(outputStream* out);
// Prints an ASCII representation of the given space.
static void print_metaspace_map(outputStream* out, Metaspace::MetadataType mdtype);
static void dump(outputStream* out);
static void verify_free_chunks();
- // Checks that the values returned by allocated_capacity_bytes() and
- // capacity_bytes_slow() are the same.
- static void verify_capacity();
- static void verify_used();
+ // Check internal counters (capacity, used).
static void verify_metrics();
};
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/memory/metaspace/metaspaceCommon.cpp Tue Apr 24 18:06:32 2018 +0200
@@ -0,0 +1,132 @@
+/*
+ * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2018, SAP and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#include "precompiled.hpp"
+
+#include "memory/metaspace/metaspaceCommon.hpp"
+#include "utilities/globalDefinitions.hpp"
+#include "utilities/ostream.hpp"
+
+namespace metaspace {
+namespace internals {
+
+// Print a size, in words, scaled.
+void print_scaled_words(outputStream* st, size_t word_size, size_t scale, int width) {
+ print_human_readable_size(st, word_size * sizeof(MetaWord), scale, width);
+}
+
+// Convenience helper: prints a size value and a percentage.
+void print_scaled_words_and_percentage(outputStream* st, size_t word_size, size_t compare_word_size, size_t scale, int width) {
+ print_scaled_words(st, word_size, scale, width);
+ st->print(" (");
+ print_percentage(st, compare_word_size, word_size);
+ st->print(")");
+}
+
+
+// Print a human readable size.
+// byte_size: size, in bytes, to be printed.
+// scale: one of 1 (byte-wise printing), sizeof(word) (word-size printing), K, M, G (scaled by KB, MB, GB respectively,
+// or 0, which means the best scale is choosen dynamically.
+// width: printing width.
+void print_human_readable_size(outputStream* st, size_t byte_size, size_t scale, int width) {
+ 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_human_readable_size(st, byte_size, scale, width);
+ }
+
+#ifdef ASSERT
+ assert(scale == 1 || scale == BytesPerWord || scale == K || scale == M || scale == G, "Invalid scale");
+ // Special case: printing wordsize should only be done with word-sized values
+ if (scale == BytesPerWord) {
+ assert(byte_size % BytesPerWord == 0, "not word sized");
+ }
+#endif
+
+ if (scale == 1) {
+ st->print("%*" PRIuPTR " bytes", width, byte_size);
+ } else if (scale == BytesPerWord) {
+ st->print("%*" PRIuPTR " words", width, byte_size / BytesPerWord);
+ } else {
+ const char* display_unit = "";
+ switch(scale) {
+ case 1: display_unit = "bytes"; break;
+ case BytesPerWord: display_unit = "words"; break;
+ case K: display_unit = "KB"; break;
+ case M: display_unit = "MB"; break;
+ case G: display_unit = "GB"; break;
+ default:
+ ShouldNotReachHere();
+ }
+ 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", display_unit);
+ } else {
+ st->print("%*.2f %s", width, display_value, display_unit);
+ }
+ }
+}
+
+// Prints a percentage value. Values smaller than 1% but not 0 are displayed as "<1%", values
+// larger than 99% but not 100% are displayed as ">100%".
+void print_percentage(outputStream* st, size_t total, size_t part) {
+ if (total == 0) {
+ st->print(" ?%%");
+ } else if (part == 0) {
+ st->print(" 0%%");
+ } else if (part == total) {
+ st->print("100%%");
+ } else {
+ // Note: clearly print very-small-but-not-0% and very-large-but-not-100% percentages.
+ float p = ((float)part / total) * 100.0f;
+ if (p < 1.0f) {
+ st->print(" <1%%");
+ } else if (p > 99.0f){
+ st->print(">99%%");
+ } else {
+ st->print("%3.0f%%", p);
+ }
+ }
+}
+
+} // namespace internals
+} // namespace metaspace
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/memory/metaspace/metaspaceCommon.hpp Tue Apr 24 18:06:32 2018 +0200
@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#ifndef SHARE_MEMORY_METASPACE_METASPACECOMMON_HPP_
+#define SHARE_MEMORY_METASPACE_METASPACECOMMON_HPP_
+
+#include "utilities/globalDefinitions.hpp"
+
+
+class outputStream;
+
+namespace metaspace {
+namespace internals {
+
+// Print a size, in words, scaled.
+void print_scaled_words(outputStream* st, size_t word_size, size_t scale = 0, int width = -1);
+
+// Convenience helper: prints a size value and a percentage.
+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 a human readable size.
+// byte_size: size, in bytes, to be printed.
+// scale: one of 1 (byte-wise printing), sizeof(word) (word-size printing), K, M, G (scaled by KB, MB, GB respectively,
+// or 0, which means the best scale is choosen dynamically.
+// width: printing width.
+void print_human_readable_size(outputStream* st, size_t byte_size, size_t scale = 0, int width = -1);
+
+// Prints a percentage value. Values smaller than 1% but not 0 are displayed as "<1%", values
+// larger than 99% but not 100% are displayed as ">100%".
+void print_percentage(outputStream* st, size_t total, size_t part);
+
+} // namespace internals
+} // namespace metaspace
+
+#endif /* SHARE_MEMORY_METASPACE_METASPACESTATISTICS_HPP_ */
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/memory/metaspace/metaspaceDCmd.cpp Tue Apr 24 18:06:32 2018 +0200
@@ -0,0 +1,100 @@
+/*
+ * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+#include "precompiled.hpp"
+#include "memory/metaspace.hpp"
+#include "memory/metaspace/metaspaceDCmd.hpp"
+#include "memory/resourceArea.hpp"
+#include "services/diagnosticCommand.hpp"
+#include "services/nmtCommon.hpp"
+
+namespace metaspace {
+
+MetaspaceDCmd::MetaspaceDCmd(outputStream* output, bool heap)
+ : DCmdWithParser(output, heap)
+ , _basic("basic", "Prints a basic summary (does not need a safepoint).", "BOOLEAN", false, "false")
+ , _show_loaders("show-loaders", "Shows usage by class loader.", "BOOLEAN", false, "false")
+ , _by_chunktype("by-chunktype", "Break down numbers by chunk type.", "BOOLEAN", false, "false")
+ , _by_spacetype("by-spacetype", "Break down numbers by loader type.", "BOOLEAN", false, "false")
+ , _show_vslist("vslist", "Shows details about the underlying virtual space.", "BOOLEAN", false, "false")
+ , _show_vsmap("vsmap", "Shows chunk composition of the underlying virtual spaces", "BOOLEAN", false, "false")
+ , _scale("scale", "Memory usage in which to scale. Valid values are: 1, KB, MB or GB (fixed scale) "
+ "or \"dynamic\" for a dynamically choosen scale.",
+ "STRING", false, "dynamic")
+{
+ _dcmdparser.add_dcmd_option(&_basic);
+ _dcmdparser.add_dcmd_option(&_show_loaders);
+ _dcmdparser.add_dcmd_option(&_by_chunktype);
+ _dcmdparser.add_dcmd_option(&_by_spacetype);
+ _dcmdparser.add_dcmd_option(&_show_vslist);
+ _dcmdparser.add_dcmd_option(&_show_vsmap);
+ _dcmdparser.add_dcmd_option(&_scale);
+}
+
+int MetaspaceDCmd::num_arguments() {
+ ResourceMark rm;
+ MetaspaceDCmd* dcmd = new MetaspaceDCmd(NULL, false);
+ if (dcmd != NULL) {
+ DCmdMark mark(dcmd);
+ return dcmd->_dcmdparser.num_arguments();
+ } else {
+ return 0;
+ }
+}
+
+void MetaspaceDCmd::execute(DCmdSource source, TRAPS) {
+ // Parse scale value.
+ const char* scale_value = _scale.value();
+ size_t scale = 0;
+ if (scale_value != NULL) {
+ if (strcasecmp("dynamic", scale_value) == 0) {
+ scale = 0;
+ } else {
+ scale = NMTUtil::scale_from_name(scale_value);
+ if (scale == 0) {
+ output()->print_cr("Invalid scale: \"%s\". Will use dynamic scaling.", scale_value);
+ }
+ }
+ }
+ if (_basic.value() == true) {
+ if (_show_loaders.value() || _by_chunktype.value() || _by_spacetype.value() ||
+ _show_vslist.value() || _show_vsmap.value()) {
+ // Basic mode. Just print essentials. Does not need to be at a safepoint.
+ output()->print_cr("In basic mode, additional arguments are ignored.");
+ }
+ MetaspaceUtils::print_basic_report(output(), scale);
+ } else {
+ // Full mode. Requires safepoint.
+ int flags = 0;
+ if (_show_loaders.value()) flags |= MetaspaceUtils::rf_show_loaders;
+ if (_by_chunktype.value()) flags |= MetaspaceUtils::rf_break_down_by_chunktype;
+ if (_by_spacetype.value()) flags |= MetaspaceUtils::rf_break_down_by_spacetype;
+ if (_show_vslist.value()) flags |= MetaspaceUtils::rf_show_vslist;
+ if (_show_vsmap.value()) flags |= MetaspaceUtils::rf_show_vsmap;
+ VM_PrintMetadata op(output(), scale, flags);
+ VMThread::execute(&op);
+ }
+}
+
+} // namespace metaspace
+
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/memory/metaspace/metaspaceDCmd.hpp Tue Apr 24 18:06:32 2018 +0200
@@ -0,0 +1,64 @@
+/*
+ * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#ifndef SHARE_MEMORY_METASPACE_METASPACEDCMD_HPP_
+#define SHARE_MEMORY_METASPACE_METASPACEDCMD_HPP_
+
+#include "services/diagnosticCommand.hpp"
+
+class outputStream;
+
+namespace metaspace {
+
+class MetaspaceDCmd : public DCmdWithParser {
+ DCmdArgument<bool> _basic;
+ DCmdArgument<bool> _show_loaders;
+ DCmdArgument<bool> _by_spacetype;
+ DCmdArgument<bool> _by_chunktype;
+ DCmdArgument<bool> _show_vslist;
+ DCmdArgument<bool> _show_vsmap;
+ DCmdArgument<char*> _scale;
+public:
+ MetaspaceDCmd(outputStream* output, bool heap);
+ static const char* name() {
+ return "VM.metaspace";
+ }
+ static const char* description() {
+ return "Prints the statistics for the metaspace";
+ }
+ static const char* impact() {
+ return "Medium: Depends on number of classes loaded.";
+ }
+ static const JavaPermission permission() {
+ JavaPermission p = {"java.lang.management.ManagementPermission",
+ "monitor", NULL};
+ return p;
+ }
+ static int num_arguments();
+ virtual void execute(DCmdSource source, TRAPS);
+};
+
+} // namespace metaspace
+
+#endif /* SHARE_MEMORY_METASPACE_METASPACESTATISTICS_HPP_ */
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/memory/metaspace/metaspaceStatistics.cpp Tue Apr 24 18:06:32 2018 +0200
@@ -0,0 +1,278 @@
+/*
+ * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2018, SAP and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+#include "precompiled.hpp"
+
+#include "memory/metachunk.hpp"
+#include "memory/metaspace/metaspaceCommon.hpp"
+#include "memory/metaspace/metaspaceStatistics.hpp"
+#include "utilities/debug.hpp"
+#include "utilities/globalDefinitions.hpp"
+#include "utilities/ostream.hpp"
+
+namespace metaspace {
+namespace internals {
+
+// FreeChunksStatistics methods
+
+FreeChunksStatistics::FreeChunksStatistics()
+: _num(0), _cap(0)
+{}
+
+void FreeChunksStatistics::reset() {
+ _num = 0; _cap = 0;
+}
+
+void FreeChunksStatistics::add(uintx n, size_t s) {
+ _num += n; _cap += s;
+}
+
+void FreeChunksStatistics::add(const FreeChunksStatistics& other) {
+ _num += other._num;
+ _cap += other._cap;
+}
+
+void FreeChunksStatistics::print_on(outputStream* st, size_t scale) const {
+ st->print(UINTX_FORMAT, _num);
+ st->print(" chunks, total capacity ");
+ print_scaled_words(st, _cap, scale);
+}
+
+// ChunkManagerStatistics methods
+
+void ChunkManagerStatistics::reset() {
+ for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
+ _chunk_stats[i].reset();
+ }
+}
+
+size_t ChunkManagerStatistics::total_capacity() const {
+ return _chunk_stats[SpecializedIndex].cap() +
+ _chunk_stats[SmallIndex].cap() +
+ _chunk_stats[MediumIndex].cap() +
+ _chunk_stats[HumongousIndex].cap();
+}
+
+void ChunkManagerStatistics::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();
+}
+
+// UsedChunksStatistics methods
+
+UsedChunksStatistics::UsedChunksStatistics()
+: _num(0), _cap(0), _used(0), _free(0), _waste(0), _overhead(0)
+{}
+
+void UsedChunksStatistics::reset() {
+ _num = 0;
+ _cap = _overhead = _used = _free = _waste = 0;
+}
+
+void UsedChunksStatistics::add(const UsedChunksStatistics& other) {
+ _num += other._num;
+ _cap += other._cap;
+ _used += other._used;
+ _free += other._free;
+ _waste += other._waste;
+ _overhead += other._overhead;
+ DEBUG_ONLY(check_sanity());
+}
+
+void UsedChunksStatistics::print_on(outputStream* st, size_t scale) const {
+ int col = st->position();
+ st->print(UINTX_FORMAT_W(4) " chunk%s, ", _num, _num != 1 ? "s" : "");
+ if (_num > 0) {
+ col += 14; 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, ");
+
+ col += 20; st->fill_to(col);
+ print_scaled_words_and_percentage(st, _overhead, _cap, scale, 5);
+ st->print(" overhead");
+ }
+ DEBUG_ONLY(check_sanity());
+}
+
+#ifdef ASSERT
+void UsedChunksStatistics::check_sanity() const {
+ assert(_overhead == (Metachunk::overhead() * _num), "Sanity: Overhead.");
+ assert(_cap == _used + _free + _waste + _overhead, "Sanity: Capacity.");
+}
+#endif
+
+// SpaceManagerStatistics methods
+
+SpaceManagerStatistics::SpaceManagerStatistics() { reset(); }
+
+void SpaceManagerStatistics::reset() {
+ for (int i = 0; i < NumberOfInUseLists; i ++) {
+ _chunk_stats[i].reset();
+ _free_blocks_num = 0; _free_blocks_cap_words = 0;
+ }
+}
+
+void SpaceManagerStatistics::add_free_blocks_info(uintx num, size_t cap) {
+ _free_blocks_num += num;
+ _free_blocks_cap_words += cap;
+}
+
+void SpaceManagerStatistics::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;
+}
+
+// Returns total chunk statistics over all chunk types.
+UsedChunksStatistics SpaceManagerStatistics::totals() const {
+ UsedChunksStatistics stat;
+ for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
+ stat.add(_chunk_stats[i]);
+ }
+ return stat;
+}
+
+void SpaceManagerStatistics::print_on(outputStream* st, size_t scale, bool detailed) const {
+ streamIndentor sti(st);
+ if (detailed) {
+ st->cr_indent();
+ st->print("Usage 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);
+ }
+ }
+
+ st->cr_indent();
+ st->print("%15s: ", "-total-");
+ totals().print_on(st, scale);
+ }
+ if (_free_blocks_num > 0) {
+ st->cr_indent();
+ st->print("deallocated: " UINTX_FORMAT " blocks with ", _free_blocks_num);
+ print_scaled_words(st, _free_blocks_cap_words, scale);
+ }
+ } else {
+ totals().print_on(st, scale);
+ st->print(", ");
+ st->print("deallocated: " UINTX_FORMAT " blocks with ", _free_blocks_num);
+ print_scaled_words(st, _free_blocks_cap_words, scale);
+ }
+}
+
+// ClassLoaderMetaspaceStatistics methods
+
+ClassLoaderMetaspaceStatistics::ClassLoaderMetaspaceStatistics() { reset(); }
+
+void ClassLoaderMetaspaceStatistics::reset() {
+ nonclass_sm_stats().reset();
+ if (Metaspace::using_class_space()) {
+ class_sm_stats().reset();
+ }
+}
+
+// Returns total space manager statistics for both class and non-class metaspace
+SpaceManagerStatistics ClassLoaderMetaspaceStatistics::totals() const {
+ SpaceManagerStatistics stats;
+ stats.add(nonclass_sm_stats());
+ if (Metaspace::using_class_space()) {
+ stats.add(class_sm_stats());
+ }
+ return stats;
+}
+
+void ClassLoaderMetaspaceStatistics::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 ClassLoaderMetaspaceStatistics::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 (detailed) {
+ st->cr();
+ }
+ if (Metaspace::using_class_space()) {
+ st->cr_indent();
+ st->print(" Class: ");
+ class_sm_stats().print_on(st, scale, detailed);
+ if (detailed) {
+ st->cr();
+ }
+ st->cr_indent();
+ st->print(" Both: ");
+ totals().print_on(st, scale, detailed);
+ if (detailed) {
+ st->cr();
+ }
+ }
+ st->cr();
+}
+
+
+} // end namespace internals
+} // end namespace metaspace
+
+
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/memory/metaspace/metaspaceStatistics.hpp Tue Apr 24 18:06:32 2018 +0200
@@ -0,0 +1,189 @@
+/*
+ * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2018, SAP and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#ifndef SHARE_MEMORY_METASPACE_METASPACESTATISTICS_HPP_
+#define SHARE_MEMORY_METASPACE_METASPACESTATISTICS_HPP_
+
+#include "utilities/globalDefinitions.hpp"
+#include "memory/metachunk.hpp" // for ChunkIndex enum
+#include "memory/metaspace.hpp" // for MetadataType enum
+
+class outputStream;
+
+namespace metaspace {
+namespace internals {
+
+// Contains statistics for a number of free chunks.
+class FreeChunksStatistics {
+ uintx _num; // Number of chunks
+ size_t _cap; // Total capacity, in words
+
+public:
+ FreeChunksStatistics();
+
+ void reset();
+
+ uintx num() const { return _num; }
+ size_t cap() const { return _cap; }
+
+ void add(uintx n, size_t s);
+ void add(const FreeChunksStatistics& other);
+ void print_on(outputStream* st, size_t scale) const;
+
+}; // 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();
+ size_t total_capacity() const;
+
+ void print_on(outputStream* st, size_t scale) const;
+
+}; // 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
+ size_t _overhead; // Total sum of chunk overheads, in words.
+
+public:
+
+ UsedChunksStatistics();
+
+ void reset();
+
+ 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; }
+
+ // Total area spent in overhead (chunk headers), in words
+ size_t overhead() const { return _overhead; }
+
+ 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_overhead(size_t s) { _overhead += s; }
+
+ void add(const UsedChunksStatistics& other);
+
+ void print_on(outputStream* st, size_t scale) const;
+
+#ifdef ASSERT
+ void check_sanity() const;
+#endif
+
+}; // 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();
+
+ // 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; }
+
+ void reset();
+
+ void add_free_blocks_info(uintx num, size_t cap);
+
+ // Returns total chunk statistics over all chunk types.
+ UsedChunksStatistics totals() const;
+
+ void add(const SpaceManagerStatistics& other);
+
+ void print_on(outputStream* st, size_t scale, bool detailed) const;
+
+}; // SpaceManagerStatistics
+
+class ClassLoaderMetaspaceStatistics {
+
+ SpaceManagerStatistics _sm_stats[Metaspace::MetadataTypeCount];
+
+public:
+
+ ClassLoaderMetaspaceStatistics();
+
+ 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); }
+
+ void reset();
+
+ void add(const ClassLoaderMetaspaceStatistics& other);
+
+ // Returns total space manager statistics for both class and non-class metaspace
+ SpaceManagerStatistics totals() const;
+
+ void print_on(outputStream* st, size_t scale, bool detailed) const;
+
+}; // ClassLoaderMetaspaceStatistics
+
+} // namespace internals
+} // namespace metaspace
+
+#endif /* SHARE_MEMORY_METASPACE_METASPACESTATISTICS_HPP_ */
--- a/src/hotspot/share/runtime/vm_operations.cpp Thu May 03 17:36:25 2018 -0700
+++ b/src/hotspot/share/runtime/vm_operations.cpp Tue Apr 24 18:06:32 2018 +0200
@@ -235,7 +235,7 @@
}
void VM_PrintMetadata::doit() {
- MetaspaceUtils::print_metadata_for_nmt(_out, _scale);
+ MetaspaceUtils::print_report(_out, _scale, _flags);
}
VM_FindDeadlocks::~VM_FindDeadlocks() {
--- a/src/hotspot/share/runtime/vm_operations.hpp Thu May 03 17:36:25 2018 -0700
+++ b/src/hotspot/share/runtime/vm_operations.hpp Tue Apr 24 18:06:32 2018 +0200
@@ -391,10 +391,14 @@
class VM_PrintMetadata : public VM_Operation {
private:
- outputStream* _out;
- size_t _scale;
+ outputStream* const _out;
+ const size_t _scale;
+ const int _flags;
+
public:
- VM_PrintMetadata(outputStream* out, size_t scale) : _out(out), _scale(scale) {};
+ VM_PrintMetadata(outputStream* out, size_t scale, int flags)
+ : _out(out), _scale(scale), _flags(flags)
+ {};
VMOp_Type type() const { return VMOp_PrintMetadata; }
void doit();
--- a/src/hotspot/share/services/diagnosticCommand.cpp Thu May 03 17:36:25 2018 -0700
+++ b/src/hotspot/share/services/diagnosticCommand.cpp Tue Apr 24 18:06:32 2018 +0200
@@ -29,6 +29,7 @@
#include "compiler/compileBroker.hpp"
#include "compiler/directivesParser.hpp"
#include "gc/shared/vmGCOperations.hpp"
+#include "memory/metaspace/metaspaceDCmd.hpp"
#include "memory/resourceArea.hpp"
#include "oops/objArrayOop.inline.hpp"
#include "oops/oop.inline.hpp"
@@ -90,7 +91,7 @@
DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<ClassHierarchyDCmd>(full_export, true, false));
DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<SymboltableDCmd>(full_export, true, false));
DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<StringtableDCmd>(full_export, true, false));
- DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<MetaspaceDCmd>(full_export, true, false));
+ DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<metaspace::MetaspaceDCmd>(full_export, true, false));
#if INCLUDE_JVMTI // Both JVMTI and SERVICES have to be enabled to have this dcmd
DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<JVMTIAgentLoadDCmd>(full_export, true, false));
#endif // INCLUDE_JVMTI
--- a/src/hotspot/share/services/diagnosticCommand.hpp Thu May 03 17:36:25 2018 -0700
+++ b/src/hotspot/share/services/diagnosticCommand.hpp Tue Apr 24 18:06:32 2018 +0200
@@ -866,25 +866,4 @@
virtual void execute(DCmdSource source, TRAPS);
};
-class MetaspaceDCmd : public DCmd {
-public:
- MetaspaceDCmd(outputStream* output, bool heap);
- static const char* name() {
- return "VM.metaspace";
- }
- static const char* description() {
- return "Prints the statistics for the metaspace";
- }
- static const char* impact() {
- return "Medium: Depends on number of classes loaded.";
- }
- static const JavaPermission permission() {
- JavaPermission p = {"java.lang.management.ManagementPermission",
- "monitor", NULL};
- return p;
- }
- static int num_arguments() { return 0; }
- virtual void execute(DCmdSource source, TRAPS);
-};
-
#endif // SHARE_VM_SERVICES_DIAGNOSTICCOMMAND_HPP
--- a/src/hotspot/share/services/memReporter.cpp Thu May 03 17:36:25 2018 -0700
+++ b/src/hotspot/share/services/memReporter.cpp Tue Apr 24 18:06:32 2018 +0200
@@ -201,7 +201,7 @@
size_t used = MetaspaceUtils::used_bytes(type);
size_t free = (MetaspaceUtils::capacity_bytes(type) - used)
+ MetaspaceUtils::free_chunks_total_bytes(type)
- + MetaspaceUtils::free_bytes(type);
+ + MetaspaceUtils::free_in_vs_bytes(type);
assert(committed >= used + free, "Sanity");
size_t waste = committed - (used + free);
--- a/src/hotspot/share/services/memTracker.cpp Thu May 03 17:36:25 2018 -0700
+++ b/src/hotspot/share/services/memTracker.cpp Tue Apr 24 18:06:32 2018 +0200
@@ -177,10 +177,12 @@
} else {
MemDetailReporter rpt(baseline, output);
rpt.report();
-
+ output->print("Metaspace:");
// Metadata reporting requires a safepoint, so avoid it if VM is not in good state.
assert(!VMError::fatal_error_in_progress(), "Do not report metadata in error report");
- VM_PrintMetadata vmop(output, K);
+ VM_PrintMetadata vmop(output, K,
+ MetaspaceUtils::rf_show_loaders |
+ MetaspaceUtils::rf_break_down_by_spacetype);
VMThread::execute(&vmop);
}
}
--- a/src/hotspot/share/services/metaspaceDCmd.cpp Thu May 03 17:36:25 2018 -0700
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,36 +0,0 @@
-/*
- * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
- *
- * This code is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 only, as
- * published by the Free Software Foundation.
- *
- * This code is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
- * version 2 for more details (a copy is included in the LICENSE file that
- * accompanied this code).
- *
- * You should have received a copy of the GNU General Public License version
- * 2 along with this work; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
- * or visit www.oracle.com if you need additional information or have any
- * questions.
- *
- */
-#include "precompiled.hpp"
-#include "memory/metaspace.hpp"
-#include "services/diagnosticCommand.hpp"
-
-MetaspaceDCmd::MetaspaceDCmd(outputStream* output, bool heap): DCmd(output, heap) {
-}
-
-void MetaspaceDCmd::execute(DCmdSource source, TRAPS) {
- const size_t scale = 1 * K;
- VM_PrintMetadata op(output(), scale);
- VMThread::execute(&op);
-}
-
--- a/src/hotspot/share/services/nmtCommon.cpp Thu May 03 17:36:25 2018 -0700
+++ b/src/hotspot/share/services/nmtCommon.cpp Tue Apr 24 18:06:32 2018 +0200
@@ -23,6 +23,7 @@
*/
#include "precompiled.hpp"
#include "services/nmtCommon.hpp"
+#include "utilities/globalDefinitions.hpp"
const char* NMTUtil::_memory_type_names[] = {
"Java Heap",
@@ -59,14 +60,13 @@
size_t NMTUtil::scale_from_name(const char* scale) {
assert(scale != NULL, "Null pointer check");
- if (strncmp(scale, "KB", 2) == 0 ||
- strncmp(scale, "kb", 2) == 0) {
+ if (strcasecmp(scale, "1") == 0 || strcasecmp(scale, "b") == 0) {
+ return 1;
+ } else if (strcasecmp(scale, "kb") == 0 || strcasecmp(scale, "k") == 0) {
return K;
- } else if (strncmp(scale, "MB", 2) == 0 ||
- strncmp(scale, "mb", 2) == 0) {
+ } else if (strcasecmp(scale, "mb") == 0 || strcasecmp(scale, "m") == 0) {
return M;
- } else if (strncmp(scale, "GB", 2) == 0 ||
- strncmp(scale, "gb", 2) == 0) {
+ } else if (strcasecmp(scale, "gb") == 0 || strcasecmp(scale, "g") == 0) {
return G;
} else {
return 0; // Invalid value
--- a/src/hotspot/share/services/virtualMemoryTracker.cpp Thu May 03 17:36:25 2018 -0700
+++ b/src/hotspot/share/services/virtualMemoryTracker.cpp Tue Apr 24 18:06:32 2018 +0200
@@ -617,7 +617,7 @@
size_t free_in_bytes = (MetaspaceUtils::capacity_bytes(type) - MetaspaceUtils::used_bytes(type))
+ MetaspaceUtils::free_chunks_total_bytes(type)
- + MetaspaceUtils::free_bytes(type);
+ + MetaspaceUtils::free_in_vs_bytes(type);
mss._free_in_bytes[type] = free_in_bytes;
}
--- a/src/hotspot/share/utilities/ostream.cpp Thu May 03 17:36:25 2018 -0700
+++ b/src/hotspot/share/utilities/ostream.cpp Tue Apr 24 18:06:32 2018 +0200
@@ -206,6 +206,10 @@
this->write("\n", 1);
}
+void outputStream::cr_indent() {
+ cr(); indent();
+}
+
void outputStream::stamp() {
if (! _stamp.is_updated()) {
_stamp.update(); // start at 0 on first call to stamp()
--- a/src/hotspot/share/utilities/ostream.hpp Thu May 03 17:36:25 2018 -0700
+++ b/src/hotspot/share/utilities/ostream.hpp Tue Apr 24 18:06:32 2018 +0200
@@ -102,8 +102,10 @@
void put(char ch);
void sp(int count = 1);
void cr();
+ void cr_indent();
void bol() { if (_position > 0) cr(); }
+
// Time stamp
TimeStamp& time_stamp() { return _stamp; }
void stamp();
@@ -152,7 +154,6 @@
~streamIndentor() { _str->dec(_amount); }
};
-
// advisory locking for the shared tty stream:
class ttyLocker: StackObj {
friend class ttyUnlocker;
--- a/src/hotspot/share/utilities/vmError.cpp Thu May 03 17:36:25 2018 -0700
+++ b/src/hotspot/share/utilities/vmError.cpp Tue Apr 24 18:06:32 2018 +0200
@@ -862,6 +862,13 @@
st->cr();
}
+ STEP("printing metaspace information")
+
+ if (_verbose && Universe::is_fully_initialized()) {
+ st->print_cr("Metaspace:");
+ MetaspaceUtils::print_basic_report(st, 0);
+ }
+
STEP("printing code cache information")
if (_verbose && Universe::is_fully_initialized()) {
@@ -1046,6 +1053,13 @@
st->cr();
}
+ // STEP("printing metaspace information")
+
+ if (Universe::is_fully_initialized()) {
+ st->print_cr("Metaspace:");
+ MetaspaceUtils::print_basic_report(st, 0);
+ }
+
// STEP("printing code cache information")
if (Universe::is_fully_initialized()) {
--- a/test/hotspot/jtreg/TEST.ROOT Thu May 03 17:36:25 2018 -0700
+++ b/test/hotspot/jtreg/TEST.ROOT Tue Apr 24 18:06:32 2018 +0200
@@ -27,7 +27,7 @@
# It also contains test-suite configuration information.
# The list of keywords supported in this test suite
-keys=cte_test jcmd nmt regression gc stress
+keys=cte_test jcmd nmt regression gc stress metaspace
groups=TEST.groups
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/test/hotspot/jtreg/runtime/Metaspace/PrintMetaspaceDcmd.java Tue Apr 24 18:06:32 2018 +0200
@@ -0,0 +1,126 @@
+/*
+ * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2018, SAP and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+import jdk.test.lib.process.ProcessTools;
+import jdk.test.lib.process.OutputAnalyzer;
+import jdk.test.lib.JDKToolFinder;
+
+/*
+ * @test
+ * @key metaspace jcmd
+ * @summary Test the VM.metaspace command
+ * @library /test/lib
+ * @modules java.base/jdk.internal.misc
+ * java.management
+ * @run main/othervm -XX:MaxMetaspaceSize=201M -XX:+VerifyMetaspace -XX:+UseCompressedClassPointers PrintMetaspaceDcmd with-compressed-class-space
+ * @run main/othervm -XX:MaxMetaspaceSize=201M -XX:+VerifyMetaspace -XX:-UseCompressedClassPointers PrintMetaspaceDcmd without-compressed-class-space
+ */
+
+public class PrintMetaspaceDcmd {
+
+ // Run jcmd VM.metaspace against a VM with CompressedClassPointers on.
+ // The report should detail Non-Class and Class portions separately.
+ private static void doTheTest(boolean usesCompressedClassSpace) throws Exception {
+ ProcessBuilder pb = new ProcessBuilder();
+ OutputAnalyzer output;
+ // Grab my own PID
+ String pid = Long.toString(ProcessTools.getProcessId());
+
+ pb.command(new String[] { JDKToolFinder.getJDKTool("jcmd"), pid, "VM.metaspace", "basic"});
+ output = new OutputAnalyzer(pb.start());
+ output.shouldHaveExitValue(0);
+ if (usesCompressedClassSpace) {
+ output.shouldContain("Non-Class:");
+ output.shouldContain("Class:");
+ }
+ output.shouldContain("Virtual space:");
+ output.shouldContain("Chunk freelists:");
+
+
+ pb.command(new String[] { JDKToolFinder.getJDKTool("jcmd"), pid, "VM.metaspace"});
+ output = new OutputAnalyzer(pb.start());
+ output.shouldHaveExitValue(0);
+ if (usesCompressedClassSpace) {
+ output.shouldContain("Non-Class:");
+ output.shouldContain("Class:");
+ }
+ output.shouldContain("Virtual space:");
+ output.shouldContain("Chunk freelist");
+ output.shouldContain("Waste");
+ output.shouldMatch("MaxMetaspaceSize:.*201.00.*MB");
+
+ pb.command(new String[] { JDKToolFinder.getJDKTool("jcmd"), pid, "VM.metaspace", "show-loaders"});
+ output = new OutputAnalyzer(pb.start());
+ output.shouldHaveExitValue(0);
+ output.shouldMatch("ClassLoaderData.*for <bootloader>");
+
+ pb.command(new String[] { JDKToolFinder.getJDKTool("jcmd"), pid, "VM.metaspace", "by-chunktype"});
+ output = new OutputAnalyzer(pb.start());
+ output.shouldHaveExitValue(0);
+ output.shouldContain("specialized:");
+ output.shouldContain("small:");
+ output.shouldContain("medium:");
+ output.shouldContain("humongous:");
+
+ pb.command(new String[] { JDKToolFinder.getJDKTool("jcmd"), pid, "VM.metaspace", "vslist"});
+ output = new OutputAnalyzer(pb.start());
+ output.shouldHaveExitValue(0);
+ output.shouldContain("Virtual space list");
+ output.shouldMatch("node.*reserved.*committed.*used.*");
+
+ pb.command(new String[] { JDKToolFinder.getJDKTool("jcmd"), pid, "VM.metaspace", "vsmap"});
+ output = new OutputAnalyzer(pb.start());
+ output.shouldHaveExitValue(0);
+ output.shouldContain("Virtual space map:");
+ output.shouldContain("HHHHHHHHHHH");
+
+ // Test with different scales
+ pb.command(new String[] { JDKToolFinder.getJDKTool("jcmd"), pid, "VM.metaspace", "scale=G"});
+ output = new OutputAnalyzer(pb.start());
+ output.shouldHaveExitValue(0);
+ output.shouldMatch("MaxMetaspaceSize:.*0.2.*GB");
+
+ pb.command(new String[] { JDKToolFinder.getJDKTool("jcmd"), pid, "VM.metaspace", "scale=K"});
+ output = new OutputAnalyzer(pb.start());
+ output.shouldHaveExitValue(0);
+ output.shouldMatch("MaxMetaspaceSize:.*205824.00 KB");
+
+ pb.command(new String[] { JDKToolFinder.getJDKTool("jcmd"), pid, "VM.metaspace", "scale=1"});
+ output = new OutputAnalyzer(pb.start());
+ output.shouldHaveExitValue(0);
+ output.shouldMatch("MaxMetaspaceSize:.*210763776 bytes");
+ }
+
+ public static void main(String args[]) throws Exception {
+ boolean testForCompressedClassSpace = false;
+ if (args[0].equals("with-compressed-class-space")) {
+ testForCompressedClassSpace = true;
+ } else if (args[0].equals("without-compressed-class-space")) {
+ testForCompressedClassSpace = false;
+ } else {
+ throw new IllegalArgumentException("Invalid argument: " + args[0]);
+ }
+ doTheTest(testForCompressedClassSpace);
+ }
+}
--- a/test/hotspot/jtreg/runtime/NMT/PrintNMTStatistics.java Thu May 03 17:36:25 2018 -0700
+++ b/test/hotspot/jtreg/runtime/NMT/PrintNMTStatistics.java Tue Apr 24 18:06:32 2018 +0200
@@ -46,6 +46,10 @@
OutputAnalyzer output_detail = new OutputAnalyzer(pb.start());
output_detail.shouldContain("Virtual memory map:");
output_detail.shouldContain("Details:");
+
+ // PrintNMTStatistics also prints out metaspace statistics as a convenience.
+ output_detail.shouldContain("Metaspace:");
+
output_detail.shouldHaveExitValue(0);
// Make sure memory reserved for Module processing is recorded.