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From 7566ad6d188b9f40b828dae1d814bcdd54967d25 Mon Sep 17 00:00:00 2001
Date: Tue, 16 Mar 2021 06:02:47 +0000
Subject: [PATCH 2/3] backport JDK-8214535 to support Jmap parallel
---
.../gc_implementation/g1/g1CollectedHeap.cpp | 30 ++++++
.../gc_implementation/g1/g1CollectedHeap.hpp | 7 +-
.../vm/gc_implementation/g1/heapRegion.hpp | 3 +-
.../parallelScavenge/parallelScavengeHeap.cpp | 75 ++++++++++++-
.../parallelScavenge/parallelScavengeHeap.hpp | 9 +-
.../parallelScavenge/psOldGen.cpp | 29 +++++
.../parallelScavenge/psOldGen.hpp | 11 ++
.../shared/vmGCOperations.cpp | 2 +-
.../shared/vmGCOperations.hpp | 4 +-
.../share/vm/gc_interface/collectedHeap.hpp | 19 +++-
.../src/share/vm/memory/genCollectedHeap.cpp | 4 +
.../src/share/vm/memory/genCollectedHeap.hpp | 3 +-
.../src/share/vm/memory/heapInspection.cpp | 102 ++++++++++++++++--
.../src/share/vm/memory/heapInspection.hpp | 46 +++++++-
hotspot/src/share/vm/runtime/arguments.hpp | 12 +--
.../src/share/vm/services/attachListener.cpp | 13 ++-
hotspot/src/share/vm/utilities/workgroup.hpp | 21 +++-
.../share/classes/sun/tools/jmap/JMap.java | 39 +++++--
jdk/test/sun/tools/common/ApplicationSetup.sh | 12 ++-
jdk/test/sun/tools/jmap/ParallelInspection.sh | 79 ++++++++++++++
22 files changed, 480 insertions(+), 45 deletions(-)
create mode 100644 jdk/test/sun/tools/jmap/ParallelInspection.sh
diff --git a/hotspot/src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp b/hotspot/src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp
index 47d8000a..5cb13535 100644
--- a/hotspot/src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp
+++ b/hotspot/src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp
@@ -59,6 +59,7 @@
#include "gc_implementation/shared/gcTraceTime.hpp"
#include "gc_implementation/shared/isGCActiveMark.hpp"
#include "memory/allocation.hpp"
+#include "memory/heapInspection.hpp"
#include "memory/gcLocker.inline.hpp"
#include "memory/generationSpec.hpp"
#include "memory/iterator.hpp"
@@ -381,6 +382,11 @@ void G1RegionMappingChangedListener::on_commit(uint start_idx, size_t num_region
reset_from_card_cache(start_idx, num_regions);
}
+void G1CollectedHeap::run_task(AbstractGangTask* task) {
+ workers()->run_task(task);
+ reset_heap_region_claim_values();
+}
+
void G1CollectedHeap::push_dirty_cards_region(HeapRegion* hr)
{
// Claim the right to put the region on the dirty cards region list
@@ -2647,6 +2653,30 @@ void G1CollectedHeap::object_iterate(ObjectClosure* cl) {
heap_region_iterate(&blk);
}
+class G1ParallelObjectIterator : public ParallelObjectIterator {
+private:
+ G1CollectedHeap* _heap;
+ uint _num_threads;
+
+public:
+ G1ParallelObjectIterator(uint thread_num) :
+ _heap(G1CollectedHeap::heap()),_num_threads(thread_num) {}
+
+ virtual void object_iterate(ObjectClosure* cl, uint worker_id) {
+ _heap->object_iterate_parallel(cl, worker_id,_num_threads);
+ }
+};
+
+ParallelObjectIterator* G1CollectedHeap::parallel_object_iterator(uint thread_num) {
+ return new G1ParallelObjectIterator(thread_num);
+}
+
+void G1CollectedHeap::object_iterate_parallel(ObjectClosure* cl, uint worker_id, uint num_workers) {
+ IterateObjectClosureRegionClosure blk(cl);
+ heap_region_par_iterate_chunked(&blk, worker_id, num_workers, HeapRegion::ParInspectClaimValue);
+}
+
+
// Calls a SpaceClosure on a HeapRegion.
class SpaceClosureRegionClosure: public HeapRegionClosure {
diff --git a/hotspot/src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp b/hotspot/src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp
index bde0ca4d..f8c52e68 100644
--- a/hotspot/src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp
+++ b/hotspot/src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp
@@ -646,6 +646,8 @@ public:
G1Allocator* allocator() {
return _allocator;
}
+ // Runs the given AbstractGangTask with the current active workers.
+ virtual void run_task(AbstractGangTask* task);
G1MonitoringSupport* g1mm() {
assert(_g1mm != NULL, "should have been initialized");
@@ -1292,6 +1294,7 @@ public:
void cleanUpCardTable();
// Iteration functions.
+ void object_iterate_parallel(ObjectClosure* cl, uint worker_id, uint num_workers);
// Iterate over all the ref-containing fields of all objects, calling
// "cl.do_oop" on each.
@@ -1299,7 +1302,7 @@ public:
// Iterate over all objects, calling "cl.do_object" on each.
virtual void object_iterate(ObjectClosure* cl);
-
+ virtual ParallelObjectIterator* parallel_object_iterator(uint thread_num);
virtual void safe_object_iterate(ObjectClosure* cl) {
object_iterate(cl);
}
@@ -1607,7 +1610,7 @@ public:
// Perform any cleanup actions necessary before allowing a verification.
virtual void prepare_for_verify();
-
+ virtual FlexibleWorkGang* get_safepoint_workers() { return _workers; }
// Perform verification.
// vo == UsePrevMarking -> use "prev" marking information,
diff --git a/hotspot/src/share/vm/gc_implementation/g1/heapRegion.hpp b/hotspot/src/share/vm/gc_implementation/g1/heapRegion.hpp
index c16c906e..b58a3cc2 100644
--- a/hotspot/src/share/vm/gc_implementation/g1/heapRegion.hpp
+++ b/hotspot/src/share/vm/gc_implementation/g1/heapRegion.hpp
@@ -347,7 +347,8 @@ class HeapRegion: public G1OffsetTableContigSpace {
ParEvacFailureClaimValue = 6,
AggregateCountClaimValue = 7,
VerifyCountClaimValue = 8,
- ParMarkRootClaimValue = 9
+ ParMarkRootClaimValue = 9,
+ ParInspectClaimValue = 10
};
// All allocated blocks are occupied by objects in a HeapRegion
diff --git a/hotspot/src/share/vm/gc_implementation/parallelScavenge/parallelScavengeHeap.cpp b/hotspot/src/share/vm/gc_implementation/parallelScavenge/parallelScavengeHeap.cpp
index e13fefa2..cf281259 100644
--- a/hotspot/src/share/vm/gc_implementation/parallelScavenge/parallelScavengeHeap.cpp
+++ b/hotspot/src/share/vm/gc_implementation/parallelScavenge/parallelScavengeHeap.cpp
@@ -60,7 +60,12 @@ jint ParallelScavengeHeap::initialize() {
_collector_policy->initialize_all();
const size_t heap_size = _collector_policy->max_heap_byte_size();
-
+ _workers = new FlexibleWorkGang("GC Thread",ParallelGCThreads, true, false);
+ if (_workers == NULL) {
+ vm_exit_during_initialization("Failed necessary allocation.");
+ } else {
+ _workers->initialize_workers();
+ }
ReservedSpace heap_rs = Universe::reserve_heap(heap_size, _collector_policy->heap_alignment());
MemTracker::record_virtual_memory_type((address)heap_rs.base(), mtJavaHeap);
@@ -547,6 +552,71 @@ void ParallelScavengeHeap::object_iterate(ObjectClosure* cl) {
old_gen()->object_iterate(cl);
}
+// The HeapBlockClaimer is used during parallel iteration over the heap,
+// allowing workers to claim heap areas ("blocks"), gaining exclusive rights to these.
+// The eden and survivor spaces are treated as single blocks as it is hard to divide
+// these spaces.
+// The old space is divided into fixed-size blocks.
+class HeapBlockClaimer : public StackObj {
+ size_t _claimed_index;
+
+public:
+ static const size_t InvalidIndex = SIZE_MAX;
+ static const size_t EdenIndex = 0;
+ static const size_t SurvivorIndex = 1;
+ static const size_t NumNonOldGenClaims = 2;
+
+ HeapBlockClaimer() : _claimed_index(EdenIndex) { }
+ // Claim the block and get the block index.
+ size_t claim_and_get_block() {
+ size_t block_index;
+ block_index = Atomic::add(1u, reinterpret_cast<volatile jint *>(&_claimed_index)) - 1;
+
+ PSOldGen* old_gen = ParallelScavengeHeap::heap()->old_gen();
+ size_t num_claims = old_gen->num_iterable_blocks() + NumNonOldGenClaims;
+
+ return block_index < num_claims ? block_index : InvalidIndex;
+ }
+};
+
+void ParallelScavengeHeap::object_iterate_parallel(ObjectClosure* cl,
+ HeapBlockClaimer* claimer) {
+ size_t block_index = claimer->claim_and_get_block();
+ // Iterate until all blocks are claimed
+ if (block_index == HeapBlockClaimer::EdenIndex) {
+ young_gen()->eden_space()->object_iterate(cl);
+ block_index = claimer->claim_and_get_block();
+ }
+ if (block_index == HeapBlockClaimer::SurvivorIndex) {
+ young_gen()->from_space()->object_iterate(cl);
+ young_gen()->to_space()->object_iterate(cl);
+ block_index = claimer->claim_and_get_block();
+ }
+ while (block_index != HeapBlockClaimer::InvalidIndex) {
+ old_gen()->object_iterate_block(cl, block_index - HeapBlockClaimer::NumNonOldGenClaims);
+ block_index = claimer->claim_and_get_block();
+ }
+}
+
+class PSScavengeParallelObjectIterator : public ParallelObjectIterator {
+private:
+ ParallelScavengeHeap* _heap;
+ HeapBlockClaimer _claimer;
+
+public:
+ PSScavengeParallelObjectIterator() :
+ _heap(ParallelScavengeHeap::heap()),
+ _claimer() {}
+
+ virtual void object_iterate(ObjectClosure* cl, uint worker_id) {
+ _heap->object_iterate_parallel(cl, &_claimer);
+ }
+};
+
+ParallelObjectIterator* ParallelScavengeHeap::parallel_object_iterator(uint thread_num) {
+ return new PSScavengeParallelObjectIterator();
+}
+
HeapWord* ParallelScavengeHeap::block_start(const void* addr) const {
if (young_gen()->is_in_reserved(addr)) {
@@ -622,6 +692,9 @@ void ParallelScavengeHeap::print_on_error(outputStream* st) const {
void ParallelScavengeHeap::gc_threads_do(ThreadClosure* tc) const {
PSScavenge::gc_task_manager()->threads_do(tc);
}
+void ParallelScavengeHeap::run_task(AbstractGangTask* task) {
+ _workers->run_task(task);
+}
void ParallelScavengeHeap::print_gc_threads_on(outputStream* st) const {
PSScavenge::gc_task_manager()->print_threads_on(st);
diff --git a/hotspot/src/share/vm/gc_implementation/parallelScavenge/parallelScavengeHeap.hpp b/hotspot/src/share/vm/gc_implementation/parallelScavenge/parallelScavengeHeap.hpp
index bf3a207c..96244cb4 100644
--- a/hotspot/src/share/vm/gc_implementation/parallelScavenge/parallelScavengeHeap.hpp
+++ b/hotspot/src/share/vm/gc_implementation/parallelScavenge/parallelScavengeHeap.hpp
@@ -41,6 +41,7 @@ class GCHeapSummary;
class GCTaskManager;
class PSAdaptiveSizePolicy;
class PSHeapSummary;
+class HeapBlockClaimer;
class ParallelScavengeHeap : public CollectedHeap {
friend class VMStructs;
@@ -55,7 +56,7 @@ class ParallelScavengeHeap : public CollectedHeap {
static ParallelScavengeHeap* _psh;
GenerationSizer* _collector_policy;
-
+ FlexibleWorkGang* _workers;
// Collection of generations that are adjacent in the
// space reserved for the heap.
AdjoiningGenerations* _gens;
@@ -208,7 +209,9 @@ class ParallelScavengeHeap : public CollectedHeap {
void oop_iterate(ExtendedOopClosure* cl);
void object_iterate(ObjectClosure* cl);
void safe_object_iterate(ObjectClosure* cl) { object_iterate(cl); }
-
+ void object_iterate_parallel(ObjectClosure* cl, HeapBlockClaimer* claimer);
+ virtual ParallelObjectIterator* parallel_object_iterator(uint thread_num);
+ virtual FlexibleWorkGang* get_safepoint_workers() { return _workers; }
HeapWord* block_start(const void* addr) const;
size_t block_size(const HeapWord* addr) const;
bool block_is_obj(const HeapWord* addr) const;
@@ -222,7 +225,7 @@ class ParallelScavengeHeap : public CollectedHeap {
virtual void print_gc_threads_on(outputStream* st) const;
virtual void gc_threads_do(ThreadClosure* tc) const;
virtual void print_tracing_info() const;
-
+ virtual void run_task(AbstractGangTask* task);
void verify(bool silent, VerifyOption option /* ignored */);
void print_heap_change(size_t prev_used);
diff --git a/hotspot/src/share/vm/gc_implementation/parallelScavenge/psOldGen.cpp b/hotspot/src/share/vm/gc_implementation/parallelScavenge/psOldGen.cpp
index 12d0d450..dd652553 100644
--- a/hotspot/src/share/vm/gc_implementation/parallelScavenge/psOldGen.cpp
+++ b/hotspot/src/share/vm/gc_implementation/parallelScavenge/psOldGen.cpp
@@ -206,6 +206,35 @@ HeapWord* PSOldGen::allocate(size_t word_size) {
return res;
}
+size_t PSOldGen::num_iterable_blocks() const {
+ return (object_space()->used_in_bytes() + IterateBlockSize - 1) / IterateBlockSize;
+}
+
+void PSOldGen::object_iterate_block(ObjectClosure* cl, size_t block_index) {
+ size_t block_word_size = IterateBlockSize / HeapWordSize;
+ assert((block_word_size % (ObjectStartArray::block_size)) == 0,
+ "Block size not a multiple of start_array block");
+
+ MutableSpace *space = object_space();
+
+ HeapWord* begin = space->bottom() + block_index * block_word_size;
+ HeapWord* end = MIN2(space->top(), begin + block_word_size);
+
+ if (!start_array()->object_starts_in_range(begin, end)) {
+ return;
+ }
+
+ // Get object starting at or reaching into this block.
+ HeapWord* start = start_array()->object_start(begin);
+ if (start < begin) {
+ start += oop(start)->size();
+ }
+ // Iterate all objects until the end.
+ for (HeapWord* p = start; p < end; p += oop(p)->size()) {
+ cl->do_object(oop(p));
+ }
+}
+
HeapWord* PSOldGen::expand_and_allocate(size_t word_size) {
expand(word_size*HeapWordSize);
if (GCExpandToAllocateDelayMillis > 0) {
diff --git a/hotspot/src/share/vm/gc_implementation/parallelScavenge/psOldGen.hpp b/hotspot/src/share/vm/gc_implementation/parallelScavenge/psOldGen.hpp
index 90fa0d56..73738b95 100644
--- a/hotspot/src/share/vm/gc_implementation/parallelScavenge/psOldGen.hpp
+++ b/hotspot/src/share/vm/gc_implementation/parallelScavenge/psOldGen.hpp
@@ -57,6 +57,9 @@ class PSOldGen : public CHeapObj<mtGC> {
const size_t _min_gen_size;
const size_t _max_gen_size;
+ // Block size for parallel iteration
+ static const size_t IterateBlockSize = 1024 * 1024;
+
// Used when initializing the _name field.
static inline const char* select_name();
@@ -170,6 +173,14 @@ class PSOldGen : public CHeapObj<mtGC> {
void oop_iterate_no_header(OopClosure* cl) { object_space()->oop_iterate_no_header(cl); }
void object_iterate(ObjectClosure* cl) { object_space()->object_iterate(cl); }
+ // Number of blocks to be iterated over in the used part of old gen.
+ size_t num_iterable_blocks() const;
+ // Iterate the objects starting in block block_index within [bottom, top) of the
+ // old gen. The object just reaching into this block is not iterated over.
+ // A block is an evenly sized non-overlapping part of the old gen of
+ // IterateBlockSize bytes.
+ void object_iterate_block(ObjectClosure* cl, size_t block_index);
+
// Debugging - do not use for time critical operations
virtual void print() const;
virtual void print_on(outputStream* st) const;
diff --git a/hotspot/src/share/vm/gc_implementation/shared/vmGCOperations.cpp b/hotspot/src/share/vm/gc_implementation/shared/vmGCOperations.cpp
index 85059b82..d086a56c 100644
--- a/hotspot/src/share/vm/gc_implementation/shared/vmGCOperations.cpp
+++ b/hotspot/src/share/vm/gc_implementation/shared/vmGCOperations.cpp
@@ -188,7 +188,7 @@ void VM_GC_HeapInspection::doit() {
}
HeapInspection inspect(_csv_format, _print_help, _print_class_stats,
_columns);
- inspect.heap_inspection(_out);
+ inspect.heap_inspection(_out, _parallel_thread_num);
}
diff --git a/hotspot/src/share/vm/gc_implementation/shared/vmGCOperations.hpp b/hotspot/src/share/vm/gc_implementation/shared/vmGCOperations.hpp
index cb070bd7..10d37522 100644
--- a/hotspot/src/share/vm/gc_implementation/shared/vmGCOperations.hpp
+++ b/hotspot/src/share/vm/gc_implementation/shared/vmGCOperations.hpp
@@ -132,18 +132,20 @@ class VM_GC_HeapInspection: public VM_GC_Operation {
private:
outputStream* _out;
bool _full_gc;
+ uint _parallel_thread_num;
bool _csv_format; // "comma separated values" format for spreadsheet.
bool _print_help;
bool _print_class_stats;
const char* _columns;
public:
- VM_GC_HeapInspection(outputStream* out, bool request_full_gc) :
+ VM_GC_HeapInspection(outputStream* out, bool request_full_gc, uint parallel_thread_num = 1) :
VM_GC_Operation(0 /* total collections, dummy, ignored */,
GCCause::_heap_inspection /* GC Cause */,
0 /* total full collections, dummy, ignored */,
request_full_gc) {
_out = out;
_full_gc = request_full_gc;
+ _parallel_thread_num = parallel_thread_num;
_csv_format = false;
_print_help = false;
_print_class_stats = false;
diff --git a/hotspot/src/share/vm/gc_interface/collectedHeap.hpp b/hotspot/src/share/vm/gc_interface/collectedHeap.hpp
index 88632ddc..7af75fd6 100644
--- a/hotspot/src/share/vm/gc_interface/collectedHeap.hpp
+++ b/hotspot/src/share/vm/gc_interface/collectedHeap.hpp
@@ -25,6 +25,7 @@
#ifndef SHARE_VM_GC_INTERFACE_COLLECTEDHEAP_HPP
#define SHARE_VM_GC_INTERFACE_COLLECTEDHEAP_HPP
+#include "utilities/workgroup.hpp"
#include "gc_interface/gcCause.hpp"
#include "gc_implementation/shared/gcWhen.hpp"
#include "memory/allocation.hpp"
@@ -38,7 +39,7 @@
// is an abstract class: there may be many different kinds of heaps. This
// class defines the functions that a heap must implement, and contains
// infrastructure common to all heaps.
-
+class AbstractGangTask;
class AdaptiveSizePolicy;
class BarrierSet;
class CollectorPolicy;
@@ -74,6 +75,12 @@ class GCHeapLog : public EventLogBase<GCMessage> {
}
};
+class ParallelObjectIterator : public CHeapObj<mtGC> {
+public:
+ virtual void object_iterate(ObjectClosure* cl, uint worker_id) = 0;
+};
+
+
//
// CollectedHeap
// SharedHeap
@@ -461,7 +468,7 @@ class CollectedHeap : public CHeapObj<mtInternal> {
// Does this heap support heap inspection (+PrintClassHistogram?)
virtual bool supports_heap_inspection() const = 0;
-
+ virtual FlexibleWorkGang* get_safepoint_workers() { return NULL; }
// Perform a collection of the heap; intended for use in implementing
// "System.gc". This probably implies as full a collection as the
// "CollectedHeap" supports.
@@ -514,7 +521,10 @@ class CollectedHeap : public CHeapObj<mtInternal> {
// Iterate over all objects, calling "cl.do_object" on each.
virtual void object_iterate(ObjectClosure* cl) = 0;
- // Similar to object_iterate() except iterates only
+ virtual ParallelObjectIterator* parallel_object_iterator(uint thread_num) {
+ return NULL;
+ }
+
// over live objects.
virtual void safe_object_iterate(ObjectClosure* cl) = 0;
@@ -593,6 +603,9 @@ class CollectedHeap : public CHeapObj<mtInternal> {
// Iterator for all GC threads (other than VM thread)
virtual void gc_threads_do(ThreadClosure* tc) const = 0;
+ // Run given task. Possibly in parallel if the GC supports it.
+ virtual void run_task(AbstractGangTask* task) = 0;
+
// Print any relevant tracing info that flags imply.
// Default implementation does nothing.
virtual void print_tracing_info() const = 0;
diff --git a/hotspot/src/share/vm/memory/genCollectedHeap.cpp b/hotspot/src/share/vm/memory/genCollectedHeap.cpp
index bbe6370a..ed2c0afb 100644
--- a/hotspot/src/share/vm/memory/genCollectedHeap.cpp
+++ b/hotspot/src/share/vm/memory/genCollectedHeap.cpp
@@ -1414,3 +1414,7 @@ void GenCollectedHeap::stop() {
}
#endif
}
+
+void GenCollectedHeap::run_task(AbstractGangTask *task) {
+
+}
diff --git a/hotspot/src/share/vm/memory/genCollectedHeap.hpp b/hotspot/src/share/vm/memory/genCollectedHeap.hpp
index 6d0dd591..2c78ea15 100644
--- a/hotspot/src/share/vm/memory/genCollectedHeap.hpp
+++ b/hotspot/src/share/vm/memory/genCollectedHeap.hpp
@@ -120,6 +120,7 @@ public:
// Returns JNI_OK on success
virtual jint initialize();
+
char* allocate(size_t alignment,
size_t* _total_reserved, int* _n_covered_regions,
ReservedSpace* heap_rs);
@@ -229,7 +230,7 @@ public:
// may not pack objects densely; a chunk may either be an object or a
// non-object.
virtual HeapWord* block_start(const void* addr) const;
-
+ virtual void run_task(AbstractGangTask* task);
// Requires "addr" to be the start of a chunk, and returns its size.
// "addr + size" is required to be the start of a new chunk, or the end
// of the active area of the heap. Assumes (and verifies in non-product
diff --git a/hotspot/src/share/vm/memory/heapInspection.cpp b/hotspot/src/share/vm/memory/heapInspection.cpp
index cc8f4fc0..7c44c50f 100644
--- a/hotspot/src/share/vm/memory/heapInspection.cpp
+++ b/hotspot/src/share/vm/memory/heapInspection.cpp
@@ -28,6 +28,7 @@
#include "memory/genCollectedHeap.hpp"
#include "memory/heapInspection.hpp"
#include "memory/resourceArea.hpp"
+#include "runtime/atomic.hpp"
#include "runtime/os.hpp"
#include "utilities/globalDefinitions.hpp"
#include "utilities/macros.hpp"
@@ -200,6 +201,41 @@ size_t KlassInfoTable::size_of_instances_in_words() const {
return _size_of_instances_in_words;
}
+// Return false if the entry could not be recorded on account
+// of running out of space required to create a new entry.
+bool KlassInfoTable::merge_entry(const KlassInfoEntry* cie) {
+ Klass* k = cie->klass();
+ KlassInfoEntry* elt = lookup(k);
+ // elt may be NULL if it's a new klass for which we
+ // could not allocate space for a new entry in the hashtable.
+ if (elt != NULL) {
+ elt->set_count(elt->count() + cie->count());
+ elt->set_words(elt->words() + cie->words());
+ _size_of_instances_in_words += cie->words();
+ return true;
+ }
+ return false;
+}
+
+class KlassInfoTableMergeClosure : public KlassInfoClosure {
+private:
+ KlassInfoTable* _dest;
+ bool _success;
+public:
+ KlassInfoTableMergeClosure(KlassInfoTable* table) : _dest(table), _success(true) {}
+ void do_cinfo(KlassInfoEntry* cie) {
+ _success &= _dest->merge_entry(cie);
+ }
+ bool success() { return _success; }
+};
+
+// merge from table
+bool KlassInfoTable::merge(KlassInfoTable* table) {
+ KlassInfoTableMergeClosure closure(this);
+ table->iterate(&closure);
+ return closure.success();
+}
+
int KlassInfoHisto::sort_helper(KlassInfoEntry** e1, KlassInfoEntry** e2) {
return (*e1)->compare(*e1,*e2);
}
@@ -461,7 +497,7 @@ class HistoClosure : public KlassInfoClosure {
class RecordInstanceClosure : public ObjectClosure {
private:
KlassInfoTable* _cit;
- size_t _missed_count;
+ uintx _missed_count;
BoolObjectClosure* _filter;
public:
RecordInstanceClosure(KlassInfoTable* cit, BoolObjectClosure* filter) :
@@ -475,7 +511,7 @@ class RecordInstanceClosure : public ObjectClosure {
}
}
- size_t missed_count() { return _missed_count; }
+ uintx missed_count() { return _missed_count; }
private:
bool should_visit(oop obj) {
@@ -483,17 +519,67 @@ class RecordInstanceClosure : public ObjectClosure {
}
};
-size_t HeapInspection::populate_table(KlassInfoTable* cit, BoolObjectClosure *filter) {
- ResourceMark rm;
+// Heap inspection for every worker.
+// When native OOM hanppens for KlassInfoTable, set _success to false.
+void ParHeapInspectTask::work(uint worker_id) {
+ uintx missed_count = 0;
+ bool merge_success = true;
+ if (!Atomic::load(reinterpret_cast<jlong *>(&_success))) {
+ // other worker has failed on parallel iteration.
+ return;
+ }
+ KlassInfoTable cit(false);
+ if (cit.allocation_failed()) {
+ // fail to allocate memory, stop parallel mode
+ Atomic::store(false, reinterpret_cast<jlong *>(&_success));
+ return;
+ }
+ RecordInstanceClosure ric(&cit, _filter);
+ _poi->object_iterate(&ric, worker_id);
+ missed_count = ric.missed_count();
+ {
+ MutexLocker x(&_mutex);
+ merge_success = _shared_cit->merge(&cit);
+ }
+ if (merge_success) {
+ Atomic::add(missed_count, reinterpret_cast<jlong *>(&missed_count));
+ } else {
+ Atomic::store(false, reinterpret_cast<jlong *>(&_success));
+ }
+}
+size_t HeapInspection::populate_table(KlassInfoTable* cit, BoolObjectClosure *filter, uint parallel_thread_num) {
+ // Try parallel first.
+ if (parallel_thread_num > 1) {
+ ResourceMark rm;
+ FlexibleWorkGang* gang = Universe::heap()->get_safepoint_workers();
+ if (gang != NULL) {
+ // The GC provided a WorkGang to be used during a safepoint.
+ // Can't run with more threads than provided by the WorkGang.
+ WithUpdatedActiveWorkers update_and_restore(gang, parallel_thread_num);
+ ParallelObjectIterator* poi = Universe::heap()->parallel_object_iterator(gang->active_workers());
+ if (poi != NULL) {
+ // The GC supports parallel object iteration.
+ ParHeapInspectTask task(poi, cit, filter);
+ // Run task with the active workers.
+ Universe::heap()->run_task(&task);
+ delete poi;
+ if (task.success()) {
+ return task.missed_count();
+ }
+ }
+ }
+ }
+
+ ResourceMark rm;
+ // If no parallel iteration available, run serially.
RecordInstanceClosure ric(cit, filter);
Universe::heap()->object_iterate(&ric);
return ric.missed_count();
}
-void HeapInspection::heap_inspection(outputStream* st) {
+void HeapInspection::heap_inspection(outputStream* st, uint parallel_thread_num) {
ResourceMark rm;
-
if (_print_help) {
for (int c=0; c<KlassSizeStats::_num_columns; c++) {
st->print("%s:\n\t", name_table[c]);
@@ -514,9 +600,9 @@ void HeapInspection::heap_inspection(outputStream* st) {
KlassInfoTable cit(_print_class_stats);
if (!cit.allocation_failed()) {
- size_t missed_count = populate_table(&cit);
+ uintx missed_count = populate_table(&cit, NULL, parallel_thread_num);
if (missed_count != 0) {
- st->print_cr("WARNING: Ran out of C-heap; undercounted " SIZE_FORMAT
+ st->print_cr("WARNING: Ran out of C-heap; undercounted " UINTX_FORMAT
" total instances in data below",
missed_count);
}
diff --git a/hotspot/src/share/vm/memory/heapInspection.hpp b/hotspot/src/share/vm/memory/heapInspection.hpp
index c5fec15c..d2fed80b 100644
--- a/hotspot/src/share/vm/memory/heapInspection.hpp
+++ b/hotspot/src/share/vm/memory/heapInspection.hpp
@@ -25,11 +25,14 @@
#ifndef SHARE_VM_MEMORY_HEAPINSPECTION_HPP
#define SHARE_VM_MEMORY_HEAPINSPECTION_HPP
+#include "utilities/workgroup.hpp"
#include "memory/allocation.inline.hpp"
#include "oops/oop.inline.hpp"
#include "oops/annotations.hpp"
#include "utilities/macros.hpp"
+class ParallelObjectIterator;
+
#if INCLUDE_SERVICES
@@ -254,7 +257,8 @@ class KlassInfoTable: public StackObj {
void iterate(KlassInfoClosure* cic);
bool allocation_failed() { return _buckets == NULL; }
size_t size_of_instances_in_words() const;
-
+ bool merge(KlassInfoTable* table);
+ bool merge_entry(const KlassInfoEntry* cie);
friend class KlassInfoHisto;
};
@@ -366,11 +370,47 @@ class HeapInspection : public StackObj {
bool print_class_stats, const char *columns) :
_csv_format(csv_format), _print_help(print_help),
_print_class_stats(print_class_stats), _columns(columns) {}
- void heap_inspection(outputStream* st) NOT_SERVICES_RETURN;
- size_t populate_table(KlassInfoTable* cit, BoolObjectClosure* filter = NULL) NOT_SERVICES_RETURN_(0);
+ void heap_inspection(outputStream* st, uint parallel_thread_num = 1) NOT_SERVICES_RETURN;
+ size_t populate_table(KlassInfoTable* cit, BoolObjectClosure* filter = NULL, uint parallel_thread_num = 1) NOT_SERVICES_RETURN_(0);
static void find_instances_at_safepoint(Klass* k, GrowableArray<oop>* result) NOT_SERVICES_RETURN;
private:
void iterate_over_heap(KlassInfoTable* cit, BoolObjectClosure* filter = NULL);
};
+// Parallel heap inspection task. Parallel inspection can fail due to
+// a native OOM when allocating memory for TL-KlassInfoTable.
+// _success will be set false on an OOM, and serial inspection tried.
+class ParHeapInspectTask : public AbstractGangTask {
+private:
+ ParallelObjectIterator *_poi;
+ KlassInfoTable *_shared_cit;
+ BoolObjectClosure *_filter;
+ uintx _missed_count;
+ bool _success;
+ Mutex _mutex;
+
+public:
+ ParHeapInspectTask(ParallelObjectIterator *poi,
+ KlassInfoTable *shared_cit,
+ BoolObjectClosure *filter) :
+ AbstractGangTask("Iterating heap"),
+ _poi(poi),
+ _shared_cit(shared_cit),
+ _filter(filter),
+ _missed_count(0),
+ _success(true),
+ _mutex(Mutex::leaf, "Parallel heap iteration data merge lock") {}
+
+ uintx missed_count() const {
+ return _missed_count;
+ }
+
+ bool success() {
+ return _success;
+ }
+
+ virtual void work(uint worker_id);
+};
+
+
#endif // SHARE_VM_MEMORY_HEAPINSPECTION_HPP
diff --git a/hotspot/src/share/vm/runtime/arguments.hpp b/hotspot/src/share/vm/runtime/arguments.hpp
index 03f293e3..9dbe99ef 100644
--- a/hotspot/src/share/vm/runtime/arguments.hpp
+++ b/hotspot/src/share/vm/runtime/arguments.hpp
@@ -424,12 +424,6 @@ class Arguments : AllStatic {
static ArgsRange check_memory_size(julong size, julong min_size);
static ArgsRange parse_memory_size(const char* s, julong* long_arg,
julong min_size);
- // Parse a string for a unsigned integer. Returns true if value
- // is an unsigned integer greater than or equal to the minimum
- // parameter passed and returns the value in uintx_arg. Returns
- // false otherwise, with uintx_arg undefined.
- static bool parse_uintx(const char* value, uintx* uintx_arg,
- uintx min_size);
// methods to build strings from individual args
static void build_jvm_args(const char* arg);
@@ -478,6 +472,12 @@ class Arguments : AllStatic {
public:
// Parses the arguments, first phase
static jint parse(const JavaVMInitArgs* args);
+ // Parse a string for a unsigned integer. Returns true if value
+ // is an unsigned integer greater than or equal to the minimum
+ // parameter passed and returns the value in uintx_arg. Returns
+ // false otherwise, with uintx_arg undefined
+ static bool parse_uintx(const char* value, uintx* uintx_arg,
+ uintx min_size);
// Apply ergonomics
static jint apply_ergo();
// Adjusts the arguments after the OS have adjusted the arguments
diff --git a/hotspot/src/share/vm/services/attachListener.cpp b/hotspot/src/share/vm/services/attachListener.cpp
index 0f51378d..d7529a44 100644
--- a/hotspot/src/share/vm/services/attachListener.cpp
+++ b/hotspot/src/share/vm/services/attachListener.cpp
@@ -214,9 +214,11 @@ jint dump_heap(AttachOperation* op, outputStream* out) {
//
// Input arguments :-
// arg0: "-live" or "-all"
+// arg1: parallel thread number
static jint heap_inspection(AttachOperation* op, outputStream* out) {
bool live_objects_only = true; // default is true to retain the behavior before this change is made
const char* arg0 = op->arg(0);
+ uint parallel_thread_num = MAX2<uint>(1, (uint)os::initial_active_processor_count() * 3 / 8);
if (arg0 != NULL && (strlen(arg0) > 0)) {
if (strcmp(arg0, "-all") != 0 && strcmp(arg0, "-live") != 0) {
out->print_cr("Invalid argument to inspectheap operation: %s", arg0);
@@ -224,7 +226,16 @@ static jint heap_inspection(AttachOperation* op, outputStream* out) {
}
live_objects_only = strcmp(arg0, "-live") == 0;
}
- VM_GC_HeapInspection heapop(out, live_objects_only /* request full gc */);
+ const char* num_str = op->arg(1);
+ if (num_str != NULL && num_str[0] != '\0') {
+ uintx num;
+ if (!Arguments::parse_uintx(num_str, &num, 0)) {
+ out->print_cr("Invalid parallel thread number: [%s]", num_str);
+ return JNI_ERR;
+ }
+ parallel_thread_num = num == 0 ? parallel_thread_num : (uint)num;
+ }
+ VM_GC_HeapInspection heapop(out, live_objects_only /* request full gc */, parallel_thread_num);
VMThread::execute(&heapop);
return JNI_OK;
}
diff --git a/hotspot/src/share/vm/utilities/workgroup.hpp b/hotspot/src/share/vm/utilities/workgroup.hpp
index dd956515..7e0fc973 100644
--- a/hotspot/src/share/vm/utilities/workgroup.hpp
+++ b/hotspot/src/share/vm/utilities/workgroup.hpp
@@ -163,6 +163,7 @@ public:
virtual uint active_workers() const {
return _total_workers;
}
+
bool terminate() const {
return _terminate;
}
@@ -325,6 +326,10 @@ class FlexibleWorkGang: public WorkGang {
_active_workers(UseDynamicNumberOfGCThreads ? 1U : ParallelGCThreads) {}
// Accessors for fields
virtual uint active_workers() const { return _active_workers; }
+ uint update_active_workers(uint v) {
+ _active_workers = MIN2(v, _active_workers);
+ return _active_workers;
+ }
void set_active_workers(uint v) {
assert(v <= _total_workers,
"Trying to set more workers active than there are");
@@ -339,7 +344,21 @@ class FlexibleWorkGang: public WorkGang {
return _started_workers < _active_workers;
}
};
-
+class WithUpdatedActiveWorkers : public StackObj {
+private:
+ FlexibleWorkGang* const _gang;
+ const uint _old_active_workers;
+public:
+ WithUpdatedActiveWorkers(FlexibleWorkGang* gang, uint requested_num_workers) :
+ _gang(gang),
+ _old_active_workers(gang->active_workers()) {
+ uint capped_num_workers = MIN2(requested_num_workers, gang->active_workers());
+ gang->update_active_workers(capped_num_workers);
+ }
+ ~WithUpdatedActiveWorkers() {
+ _gang->set_active_workers(_old_active_workers);
+ }
+};
// Work gangs in garbage collectors: 2009-06-10
//
// SharedHeap - work gang for stop-the-world parallel collection.
diff --git a/jdk/src/share/classes/sun/tools/jmap/JMap.java b/jdk/src/share/classes/sun/tools/jmap/JMap.java
index 5d349fc0..e891b6c5 100644
--- a/jdk/src/share/classes/sun/tools/jmap/JMap.java
+++ b/jdk/src/share/classes/sun/tools/jmap/JMap.java
@@ -47,7 +47,8 @@ public class JMap {
private static String HISTO_OPTION = "-histo";
private static String LIVE_HISTO_OPTION = "-histo:live";
private static String DUMP_OPTION_PREFIX = "-dump:";
-
+ private static final String LIVE_OBJECTS_OPTION = "-live";
+ private static final String ALL_OBJECTS_OPTION = "-all";
// These options imply the use of a SA tool
private static String SA_TOOL_OPTIONS =
"-heap|-heap:format=b|-clstats|-finalizerinfo";
@@ -134,10 +135,10 @@ public class JMap {
// Here we handle the built-in options
// As more options are added we should create an abstract tool class and
// have a table to map the options
- if (option.equals(HISTO_OPTION)) {
- histo(pid, false);
- } else if (option.equals(LIVE_HISTO_OPTION)) {
- histo(pid, true);
+ if (option.equals("-histo")) {
+ histo(pid, "");
+ } else if (option.startsWith("-histo:")) {
+ histo(pid, option.substring("-histo:".length()));
} else if (option.startsWith(DUMP_OPTION_PREFIX)) {
dump(pid, option);
} else {
@@ -216,12 +217,26 @@ public class JMap {
return null;
}
- private static final String LIVE_OBJECTS_OPTION = "-live";
- private static final String ALL_OBJECTS_OPTION = "-all";
- private static void histo(String pid, boolean live) throws IOException {
+
+ private static void histo(String pid, String options) throws IOException {
VirtualMachine vm = attach(pid);
- InputStream in = ((HotSpotVirtualMachine)vm).
- heapHisto(live ? LIVE_OBJECTS_OPTION : ALL_OBJECTS_OPTION);
+ String parallel = null;
+ String liveopt = "-all";
+ if (options.startsWith("live")) {
+ liveopt = "-live";
+ }
+ String[] subopts = options.split(",");
+ for (int i = 0; i < subopts.length; i++) {
+ String subopt = subopts[i];
+ if (subopt.startsWith("parallel=")) {
+ parallel = subopt.substring("parallel=".length());
+ if (parallel == null) {
+ System.err.println("Fail: no number provided in option: '" + subopt + "'");
+ System.exit(1);
+ }
+ }
+ }
+ InputStream in = ((HotSpotVirtualMachine)vm).heapHisto(liveopt,parallel);
drain(vm, in);
}
@@ -360,6 +375,10 @@ public class JMap {
System.err.println(" -heap to print java heap summary");
System.err.println(" -histo[:live] to print histogram of java object heap; if the \"live\"");
System.err.println(" suboption is specified, only count live objects");
+ System.err.println(" parallel=<number> parallel threads number for heap iteration:");
+ System.err.println(" parallel=0 default behavior, use predefined number of threads");
+ System.err.println(" parallel=1 disable parallel heap iteration");
+ System.err.println(" parallel=<N> use N threads for parallel heap iteration");
System.err.println(" -clstats to print class loader statistics");
System.err.println(" -finalizerinfo to print information on objects awaiting finalization");
System.err.println(" -dump:<dump-options> to dump java heap in hprof binary format");
diff --git a/jdk/test/sun/tools/common/ApplicationSetup.sh b/jdk/test/sun/tools/common/ApplicationSetup.sh
index 64da8b96..c0f6a636 100644
--- a/jdk/test/sun/tools/common/ApplicationSetup.sh
+++ b/jdk/test/sun/tools/common/ApplicationSetup.sh
@@ -42,8 +42,15 @@
startApplication()
{
appOutput="${TESTCLASSES}/Application.out"
-
- ${JAVA} -XX:+UsePerfData -classpath "${TESTCLASSPATH:-${TESTCLASSES}}" "$@" > "$appOutput" 2>&1 &
+ if [ $# -gt 2 ]; then
+ if [ $3 = "defineGC" ]; then
+ ${JAVA} -XX:+UsePerfData -XX:+$4 -classpath "${TESTCLASSPATH:-${TESTCLASSES}}" "$@" > "$appOutput" 2>&1 &
+ else
+ ${JAVA} -XX:+UsePerfData -classpath "${TESTCLASSPATH:-${TESTCLASSES}}" "$@" > "$appOutput" 2>&1 &
+ fi
+ else
+ ${JAVA} -XX:+UsePerfData -classpath "${TESTCLASSPATH:-${TESTCLASSES}}" "$@" > "$appOutput" 2>&1 &
+ fi
appJavaPid="$!"
appOtherPid=
appPidList="$appJavaPid"
@@ -120,7 +127,6 @@ startApplication()
echo "INFO: $1 output is in $appOutput"
}
-
# Stops a simple application by invoking ShutdownSimpleApplication
# class with a specific port-file, usage:
# stopApplication port-file
diff --git a/jdk/test/sun/tools/jmap/ParallelInspection.sh b/jdk/test/sun/tools/jmap/ParallelInspection.sh
new file mode 100644
index 00000000..69e51a76
--- /dev/null
+++ b/jdk/test/sun/tools/jmap/ParallelInspection.sh
@@ -0,0 +1,79 @@
+#!/bin/sh
+
+#
+# Copyright (c) Huawei Technologies Co., Ltd. 2020. All rights reserved.
+#
+
+# @test
+# @summary Unit test for jmap parallel heap inspection feature
+# @library ../common
+# @build SimpleApplication ShutdownSimpleApplication
+# @run shell ParallelInspection.sh
+
+. ${TESTSRC}/../common/CommonSetup.sh
+. ${TESTSRC}/../common/ApplicationSetup.sh
+# parallel num in G1GC
+# Start application and use PORTFILE for coordination
+PORTFILE="${TESTCLASSES}"/shutdown.port
+startApplication SimpleApplication "${PORTFILE}" defineGC UseG1GC
+
+# all return statuses are checked in this test
+set +e
+
+failed=0
+
+${JMAP} -J-XX:+UsePerfData -histo:parallel=0 $appJavaPid
+if [ $? != 0 ]; then failed=1; fi
+
+${JMAP} -J-XX:+UsePerfData -histo:parallel=1 $appJavaPid
+if [ $? != 0 ]; then failed=1; fi
+
+${JMAP} -J-XX:+UsePerfData -histo:parallel=2 $appJavaPid
+if [ $? != 0 ]; then failed=1; fi
+
+${JMAP} -J-XX:+UsePerfData -histo:live,parallel=0 $appJavaPid
+if [ $? != 0 ]; then failed=1; fi
+
+${JMAP} -J-XX:+UsePerfData -histo:live,parallel=1 $appJavaPid
+if [ $? != 0 ]; then failed=1; fi
+
+${JMAP} -J-XX:+UsePerfData -histo:live,parallel=2 $appJavaPid
+if [ $? != 0 ]; then failed=1; fi
+set -e
+
+stopApplication "${PORTFILE}"
+waitForApplication
+
+# parallel num in ParallelGC
+# Start application and use PORTFILE for coordination
+PORTFILE="${TESTCLASSES}"/shutdown.port
+startApplication SimpleApplication "${PORTFILE}" defineGC UseParallelGC
+
+# all return statuses are checked in this test
+set +e
+
+failed=0
+
+${JMAP} -J-XX:+UsePerfData -histo:parallel=0 $appJavaPid
+if [ $? != 0 ]; then failed=1; fi
+
+${JMAP} -J-XX:+UsePerfData -histo:parallel=1 $appJavaPid
+if [ $? != 0 ]; then failed=1; fi
+
+${JMAP} -J-XX:+UsePerfData -histo:parallel=2 $appJavaPid
+if [ $? != 0 ]; then failed=1; fi
+
+${JMAP} -J-XX:+UsePerfData -histo:live,parallel=0 $appJavaPid
+if [ $? != 0 ]; then failed=1; fi
+
+${JMAP} -J-XX:+UsePerfData -histo:live,parallel=1 $appJavaPid
+if [ $? != 0 ]; then failed=1; fi
+
+${JMAP} -J-XX:+UsePerfData -histo:live,parallel=2 $appJavaPid
+if [ $? != 0 ]; then failed=1; fi
+set -e
+
+stopApplication "${PORTFILE}"
+waitForApplication
+
+exit $failed
--
2.19.0
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