src/hotspot/share/gc/shared/gcTraceSend.cpp - toolchain/jdk/jdk21 - Git at Google

 /*
  * Copyright (c) 2012, 2023, 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 "gc/shared/copyFailedInfo.hpp"
 #include "gc/shared/gcHeapSummary.hpp"
 #include "gc/shared/gcTimer.hpp"
 #include "gc/shared/gcTrace.hpp"
 #include "gc/shared/gcWhen.hpp"
 #include "jfr/jfrEvents.hpp"
 #include "runtime/os.hpp"
 #include "utilities/macros.hpp"

 // All GC dependencies against the trace framework is contained within this file.

 typedef uintptr_t TraceAddress;

 bool GCTracer::should_send_cpu_time_event() const {
   return EventGCCPUTime::is_enabled();
 }

 void GCTracer::send_garbage_collection_event() const {
   EventGarbageCollection event(UNTIMED);
   if (event.should_commit()) {
     event.set_gcId(GCId::current());
     event.set_name(_shared_gc_info.name());
     event.set_cause((u2) _shared_gc_info.cause());
     event.set_sumOfPauses(_shared_gc_info.sum_of_pauses());
     event.set_longestPause(_shared_gc_info.longest_pause());
     event.set_starttime(_shared_gc_info.start_timestamp());
     event.set_endtime(_shared_gc_info.end_timestamp());
     event.commit();
   }
 }

 void GCTracer::send_cpu_time_event(double user_time, double system_time, double real_time) const {
   EventGCCPUTime e;
   if (e.should_commit()) {
       e.set_gcId(GCId::current());
       e.set_userTime((size_t)(user_time * NANOUNITS));
       e.set_systemTime((size_t)(system_time * NANOUNITS));
       e.set_realTime((size_t)(real_time * NANOUNITS));
       e.commit();
   }
 }

 void GCTracer::send_reference_stats_event(ReferenceType type, size_t count) const {
   EventGCReferenceStatistics e;
   if (e.should_commit()) {
       e.set_gcId(GCId::current());
       e.set_type((u1)type);
       e.set_count(count);
       e.commit();
   }
 }

 void GCTracer::send_metaspace_chunk_free_list_summary(GCWhen::Type when, Metaspace::MetadataType mdtype,
                                                       const MetaspaceChunkFreeListSummary& summary) const {
   EventMetaspaceChunkFreeListSummary e;
   if (e.should_commit()) {
     e.set_gcId(GCId::current());
     e.set_when(when);
     e.set_metadataType(mdtype);

     e.set_specializedChunks(summary.num_specialized_chunks());
     e.set_specializedChunksTotalSize(summary.specialized_chunks_size_in_bytes());

     e.set_smallChunks(summary.num_small_chunks());
     e.set_smallChunksTotalSize(summary.small_chunks_size_in_bytes());

     e.set_mediumChunks(summary.num_medium_chunks());
     e.set_mediumChunksTotalSize(summary.medium_chunks_size_in_bytes());

     e.set_humongousChunks(summary.num_humongous_chunks());
     e.set_humongousChunksTotalSize(summary.humongous_chunks_size_in_bytes());

     e.commit();
   }
 }

 void ParallelOldTracer::send_parallel_old_event() const {
   EventParallelOldGarbageCollection e(UNTIMED);
   if (e.should_commit()) {
     e.set_gcId(GCId::current());
     e.set_densePrefix((TraceAddress)_parallel_old_gc_info.dense_prefix());
     e.set_starttime(_shared_gc_info.start_timestamp());
     e.set_endtime(_shared_gc_info.end_timestamp());
     e.commit();
   }
 }

 void YoungGCTracer::send_young_gc_event() const {
   EventYoungGarbageCollection e(UNTIMED);
   if (e.should_commit()) {
     e.set_gcId(GCId::current());
     e.set_tenuringThreshold(_tenuring_threshold);
     e.set_starttime(_shared_gc_info.start_timestamp());
     e.set_endtime(_shared_gc_info.end_timestamp());
     e.commit();
   }
 }

 bool YoungGCTracer::should_send_promotion_in_new_plab_event() const {
   return EventPromoteObjectInNewPLAB::is_enabled();
 }

 bool YoungGCTracer::should_send_promotion_outside_plab_event() const {
   return EventPromoteObjectOutsidePLAB::is_enabled();
 }

 void YoungGCTracer::send_promotion_in_new_plab_event(Klass* klass, size_t obj_size,
                                                      uint age, bool tenured,
                                                      size_t plab_size) const {

   EventPromoteObjectInNewPLAB event;
   if (event.should_commit()) {
     event.set_gcId(GCId::current());
     event.set_objectClass(klass);
     event.set_objectSize(obj_size);
     event.set_tenured(tenured);
     event.set_tenuringAge(age);
     event.set_plabSize(plab_size);
     event.commit();
   }
 }

 void YoungGCTracer::send_promotion_outside_plab_event(Klass* klass, size_t obj_size,
                                                       uint age, bool tenured) const {

   EventPromoteObjectOutsidePLAB event;
   if (event.should_commit()) {
     event.set_gcId(GCId::current());
     event.set_objectClass(klass);
     event.set_objectSize(obj_size);
     event.set_tenured(tenured);
     event.set_tenuringAge(age);
     event.commit();
   }
 }

 void OldGCTracer::send_old_gc_event() const {
   EventOldGarbageCollection e(UNTIMED);
   if (e.should_commit()) {
     e.set_gcId(GCId::current());
     e.set_starttime(_shared_gc_info.start_timestamp());
     e.set_endtime(_shared_gc_info.end_timestamp());
     e.commit();
   }
 }

 static JfrStructCopyFailed to_struct(const CopyFailedInfo& cf_info) {
   JfrStructCopyFailed failed_info;
   failed_info.set_objectCount(cf_info.failed_count());
   failed_info.set_firstSize(cf_info.first_size() * HeapWordSize);
   failed_info.set_smallestSize(cf_info.smallest_size() * HeapWordSize);
   failed_info.set_totalSize(cf_info.total_size() * HeapWordSize);
   return failed_info;
 }

 void YoungGCTracer::send_promotion_failed_event(const PromotionFailedInfo& pf_info) const {
   EventPromotionFailed e;
   if (e.should_commit()) {
     e.set_gcId(GCId::current());
     e.set_promotionFailed(to_struct(pf_info));
     e.set_thread(pf_info.thread_trace_id());
     e.commit();
   }
 }

 // G1
 void OldGCTracer::send_concurrent_mode_failure_event() {
   EventConcurrentModeFailure e;
   if (e.should_commit()) {
     e.set_gcId(GCId::current());
     e.commit();
   }
 }

 static JfrStructVirtualSpace to_struct(const VirtualSpaceSummary& summary) {
   JfrStructVirtualSpace space;
   space.set_start((TraceAddress)summary.start());
   space.set_committedEnd((TraceAddress)summary.committed_end());
   space.set_committedSize(summary.committed_size());
   space.set_reservedEnd((TraceAddress)summary.reserved_end());
   space.set_reservedSize(summary.reserved_size());
   return space;
 }

 static JfrStructObjectSpace to_struct(const SpaceSummary& summary) {
   JfrStructObjectSpace space;
   space.set_start((TraceAddress)summary.start());
   space.set_end((TraceAddress)summary.end());
   space.set_used(summary.used());
   space.set_size(summary.size());
   return space;
 }

 class GCHeapSummaryEventSender : public GCHeapSummaryVisitor {
   GCWhen::Type _when;
  public:
   GCHeapSummaryEventSender(GCWhen::Type when) : _when(when) {}

   void visit(const GCHeapSummary* heap_summary) const {
     const VirtualSpaceSummary& heap_space = heap_summary->heap();

     EventGCHeapSummary e;
     if (e.should_commit()) {
       e.set_gcId(GCId::current());
       e.set_when((u1)_when);
       e.set_heapSpace(to_struct(heap_space));
       e.set_heapUsed(heap_summary->used());
       e.commit();
     }
   }

   void visit(const G1HeapSummary* g1_heap_summary) const {
     visit((GCHeapSummary*)g1_heap_summary);

     EventG1HeapSummary e;
     if (e.should_commit()) {
       e.set_gcId(GCId::current());
       e.set_when((u1)_when);
       e.set_edenUsedSize(g1_heap_summary->edenUsed());
       e.set_edenTotalSize(g1_heap_summary->edenCapacity());
       e.set_survivorUsedSize(g1_heap_summary->survivorUsed());
       e.set_oldGenUsedSize(g1_heap_summary->oldGenUsed());
       e.set_numberOfRegions(g1_heap_summary->numberOfRegions());
       e.commit();
     }
   }

   void visit(const PSHeapSummary* ps_heap_summary) const {
     visit((GCHeapSummary*)ps_heap_summary);

     const VirtualSpaceSummary& old_summary = ps_heap_summary->old();
     const SpaceSummary& old_space = ps_heap_summary->old_space();
     const VirtualSpaceSummary& young_summary = ps_heap_summary->young();
     const SpaceSummary& eden_space = ps_heap_summary->eden();
     const SpaceSummary& from_space = ps_heap_summary->from();
     const SpaceSummary& to_space = ps_heap_summary->to();

     EventPSHeapSummary e;
     if (e.should_commit()) {
       e.set_gcId(GCId::current());
       e.set_when((u1)_when);

       e.set_oldSpace(to_struct(ps_heap_summary->old()));
       e.set_oldObjectSpace(to_struct(ps_heap_summary->old_space()));
       e.set_youngSpace(to_struct(ps_heap_summary->young()));
       e.set_edenSpace(to_struct(ps_heap_summary->eden()));
       e.set_fromSpace(to_struct(ps_heap_summary->from()));
       e.set_toSpace(to_struct(ps_heap_summary->to()));
       e.commit();
     }
   }
 };

 void GCTracer::send_gc_heap_summary_event(GCWhen::Type when, const GCHeapSummary& heap_summary) const {
   GCHeapSummaryEventSender visitor(when);
   heap_summary.accept(&visitor);
 }

 static JfrStructMetaspaceSizes to_struct(const MetaspaceStats& sizes) {
   JfrStructMetaspaceSizes meta_sizes;
   meta_sizes.set_committed(sizes.committed());
   meta_sizes.set_used(sizes.used());
   meta_sizes.set_reserved(sizes.reserved());
   return meta_sizes;
 }

 void GCTracer::send_meta_space_summary_event(GCWhen::Type when, const MetaspaceSummary& meta_space_summary) const {
   EventMetaspaceSummary e;
   if (e.should_commit()) {
     e.set_gcId(GCId::current());
     e.set_when((u1) when);
     e.set_gcThreshold(meta_space_summary.capacity_until_GC());
     e.set_metaspace(to_struct(meta_space_summary.stats())); // total stats (class + nonclass)
     e.set_dataSpace(to_struct(meta_space_summary.stats().non_class_space_stats())); // "dataspace" aka non-class space
     e.set_classSpace(to_struct(meta_space_summary.stats().class_space_stats()));
     e.commit();
   }
 }

 class PhaseSender : public PhaseVisitor {
   void visit_pause(GCPhase* phase) {
     assert(phase->level() < PhasesStack::PHASE_LEVELS, "Need more event types for PausePhase");

     switch (phase->level()) {
       case 0: send_phase<EventGCPhasePause>(phase); break;
       case 1: send_phase<EventGCPhasePauseLevel1>(phase); break;
       case 2: send_phase<EventGCPhasePauseLevel2>(phase); break;
       case 3: send_phase<EventGCPhasePauseLevel3>(phase); break;
       case 4: send_phase<EventGCPhasePauseLevel4>(phase); break;
       default: /* Ignore sending this phase */ break;
     }
   }

   void visit_concurrent(GCPhase* phase) {
     assert(phase->level() < 3, "There are only three levels for ConcurrentPhase");

     switch (phase->level()) {
       case 0: send_phase<EventGCPhaseConcurrent>(phase); break;
       case 1: send_phase<EventGCPhaseConcurrentLevel1>(phase); break;
       case 2: send_phase<EventGCPhaseConcurrentLevel2>(phase); break;
       default: /* Ignore sending this phase */ break;
     }
   }

  public:
   template<typename T>
   void send_phase(GCPhase* phase) {
     T event(UNTIMED);
     if (event.should_commit()) {
       event.set_gcId(GCId::current());
       event.set_name(phase->name());
       event.set_starttime(phase->start());
       event.set_endtime(phase->end());
       event.commit();
     }
   }

   void visit(GCPhase* phase) {
     if (phase->type() == GCPhase::PausePhaseType) {
       visit_pause(phase);
     } else {
       assert(phase->type() == GCPhase::ConcurrentPhaseType, "Should be ConcurrentPhaseType");
       visit_concurrent(phase);
     }
   }
 };

 void GCTracer::send_phase_events(TimePartitions* time_partitions) const {
   PhaseSender phase_reporter;

   TimePartitionPhasesIterator iter(time_partitions);
   while (iter.has_next()) {
     GCPhase* phase = iter.next();
     phase->accept(&phase_reporter);
   }
 }

 #if INCLUDE_JFR
 Ticks GCLockerTracer::_needs_gc_start_timestamp;
 volatile jint GCLockerTracer::_jni_lock_count = 0;
 volatile jint GCLockerTracer::_stall_count = 0;

 bool GCLockerTracer::is_started() {
   return _needs_gc_start_timestamp != Ticks();
 }

 void GCLockerTracer::start_gc_locker(const jint jni_lock_count) {
   assert(SafepointSynchronize::is_at_safepoint(), "sanity");
   assert(!is_started(), "sanity");
   assert(_jni_lock_count == 0, "sanity");
   assert(_stall_count == 0, "sanity");
   if (EventGCLocker::is_enabled()) {
     _needs_gc_start_timestamp.stamp();
     _jni_lock_count = jni_lock_count;
   }
 }

 void GCLockerTracer::inc_stall_count() {
   if (is_started()) {
     _stall_count++;
   }
 }

 void GCLockerTracer::report_gc_locker() {
   if (is_started()) {
     EventGCLocker event(UNTIMED);
     if (event.should_commit()) {
       event.set_starttime(_needs_gc_start_timestamp);
       event.set_endtime(_needs_gc_start_timestamp);
       event.set_lockCount(_jni_lock_count);
       event.set_stallCount(_stall_count);
       event.commit();
     }
     // reset
     _needs_gc_start_timestamp = Ticks();
     _jni_lock_count = 0;
     _stall_count = 0;

     assert(!is_started(), "sanity");
   }
 }
 #endif
	/*
	* Copyright (c) 2012, 2023, 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 "gc/shared/copyFailedInfo.hpp"
	#include "gc/shared/gcHeapSummary.hpp"
	#include "gc/shared/gcTimer.hpp"
	#include "gc/shared/gcTrace.hpp"
	#include "gc/shared/gcWhen.hpp"
	#include "jfr/jfrEvents.hpp"
	#include "runtime/os.hpp"
	#include "utilities/macros.hpp"

	// All GC dependencies against the trace framework is contained within this file.

	typedef uintptr_t TraceAddress;

	bool GCTracer::should_send_cpu_time_event() const {
	return EventGCCPUTime::is_enabled();
	}

	void GCTracer::send_garbage_collection_event() const {
	EventGarbageCollection event(UNTIMED);
	if (event.should_commit()) {
	event.set_gcId(GCId::current());
	event.set_name(_shared_gc_info.name());
	event.set_cause((u2) _shared_gc_info.cause());
	event.set_sumOfPauses(_shared_gc_info.sum_of_pauses());
	event.set_longestPause(_shared_gc_info.longest_pause());
	event.set_starttime(_shared_gc_info.start_timestamp());
	event.set_endtime(_shared_gc_info.end_timestamp());
	event.commit();
	}
	}

	void GCTracer::send_cpu_time_event(double user_time, double system_time, double real_time) const {
	EventGCCPUTime e;
	if (e.should_commit()) {
	e.set_gcId(GCId::current());
	e.set_userTime((size_t)(user_time * NANOUNITS));
	e.set_systemTime((size_t)(system_time * NANOUNITS));
	e.set_realTime((size_t)(real_time * NANOUNITS));
	e.commit();
	}
	}

	void GCTracer::send_reference_stats_event(ReferenceType type, size_t count) const {
	EventGCReferenceStatistics e;
	if (e.should_commit()) {
	e.set_gcId(GCId::current());
	e.set_type((u1)type);
	e.set_count(count);
	e.commit();
	}
	}

	void GCTracer::send_metaspace_chunk_free_list_summary(GCWhen::Type when, Metaspace::MetadataType mdtype,
	const MetaspaceChunkFreeListSummary& summary) const {
	EventMetaspaceChunkFreeListSummary e;
	if (e.should_commit()) {
	e.set_gcId(GCId::current());
	e.set_when(when);
	e.set_metadataType(mdtype);

	e.set_specializedChunks(summary.num_specialized_chunks());
	e.set_specializedChunksTotalSize(summary.specialized_chunks_size_in_bytes());

	e.set_smallChunks(summary.num_small_chunks());
	e.set_smallChunksTotalSize(summary.small_chunks_size_in_bytes());

	e.set_mediumChunks(summary.num_medium_chunks());
	e.set_mediumChunksTotalSize(summary.medium_chunks_size_in_bytes());

	e.set_humongousChunks(summary.num_humongous_chunks());
	e.set_humongousChunksTotalSize(summary.humongous_chunks_size_in_bytes());

	e.commit();
	}
	}

	void ParallelOldTracer::send_parallel_old_event() const {
	EventParallelOldGarbageCollection e(UNTIMED);
	if (e.should_commit()) {
	e.set_gcId(GCId::current());
	e.set_densePrefix((TraceAddress)_parallel_old_gc_info.dense_prefix());
	e.set_starttime(_shared_gc_info.start_timestamp());
	e.set_endtime(_shared_gc_info.end_timestamp());
	e.commit();
	}
	}

	void YoungGCTracer::send_young_gc_event() const {
	EventYoungGarbageCollection e(UNTIMED);
	if (e.should_commit()) {
	e.set_gcId(GCId::current());
	e.set_tenuringThreshold(_tenuring_threshold);
	e.set_starttime(_shared_gc_info.start_timestamp());
	e.set_endtime(_shared_gc_info.end_timestamp());
	e.commit();
	}
	}

	bool YoungGCTracer::should_send_promotion_in_new_plab_event() const {
	return EventPromoteObjectInNewPLAB::is_enabled();
	}

	bool YoungGCTracer::should_send_promotion_outside_plab_event() const {
	return EventPromoteObjectOutsidePLAB::is_enabled();
	}

	void YoungGCTracer::send_promotion_in_new_plab_event(Klass* klass, size_t obj_size,
	uint age, bool tenured,
	size_t plab_size) const {

	EventPromoteObjectInNewPLAB event;
	if (event.should_commit()) {
	event.set_gcId(GCId::current());
	event.set_objectClass(klass);
	event.set_objectSize(obj_size);
	event.set_tenured(tenured);
	event.set_tenuringAge(age);
	event.set_plabSize(plab_size);
	event.commit();
	}
	}

	void YoungGCTracer::send_promotion_outside_plab_event(Klass* klass, size_t obj_size,
	uint age, bool tenured) const {

	EventPromoteObjectOutsidePLAB event;
	if (event.should_commit()) {
	event.set_gcId(GCId::current());
	event.set_objectClass(klass);
	event.set_objectSize(obj_size);
	event.set_tenured(tenured);
	event.set_tenuringAge(age);
	event.commit();
	}
	}

	void OldGCTracer::send_old_gc_event() const {
	EventOldGarbageCollection e(UNTIMED);
	if (e.should_commit()) {
	e.set_gcId(GCId::current());
	e.set_starttime(_shared_gc_info.start_timestamp());
	e.set_endtime(_shared_gc_info.end_timestamp());
	e.commit();
	}
	}

	static JfrStructCopyFailed to_struct(const CopyFailedInfo& cf_info) {
	JfrStructCopyFailed failed_info;
	failed_info.set_objectCount(cf_info.failed_count());
	failed_info.set_firstSize(cf_info.first_size() * HeapWordSize);
	failed_info.set_smallestSize(cf_info.smallest_size() * HeapWordSize);
	failed_info.set_totalSize(cf_info.total_size() * HeapWordSize);
	return failed_info;
	}

	void YoungGCTracer::send_promotion_failed_event(const PromotionFailedInfo& pf_info) const {
	EventPromotionFailed e;
	if (e.should_commit()) {
	e.set_gcId(GCId::current());
	e.set_promotionFailed(to_struct(pf_info));
	e.set_thread(pf_info.thread_trace_id());
	e.commit();
	}
	}

	// G1
	void OldGCTracer::send_concurrent_mode_failure_event() {
	EventConcurrentModeFailure e;
	if (e.should_commit()) {
	e.set_gcId(GCId::current());
	e.commit();
	}
	}

	static JfrStructVirtualSpace to_struct(const VirtualSpaceSummary& summary) {
	JfrStructVirtualSpace space;
	space.set_start((TraceAddress)summary.start());
	space.set_committedEnd((TraceAddress)summary.committed_end());
	space.set_committedSize(summary.committed_size());
	space.set_reservedEnd((TraceAddress)summary.reserved_end());
	space.set_reservedSize(summary.reserved_size());
	return space;
	}

	static JfrStructObjectSpace to_struct(const SpaceSummary& summary) {
	JfrStructObjectSpace space;
	space.set_start((TraceAddress)summary.start());
	space.set_end((TraceAddress)summary.end());
	space.set_used(summary.used());
	space.set_size(summary.size());
	return space;
	}

	class GCHeapSummaryEventSender : public GCHeapSummaryVisitor {
	GCWhen::Type _when;
	public:
	GCHeapSummaryEventSender(GCWhen::Type when) : _when(when) {}

	void visit(const GCHeapSummary* heap_summary) const {
	const VirtualSpaceSummary& heap_space = heap_summary->heap();

	EventGCHeapSummary e;
	if (e.should_commit()) {
	e.set_gcId(GCId::current());
	e.set_when((u1)_when);
	e.set_heapSpace(to_struct(heap_space));
	e.set_heapUsed(heap_summary->used());
	e.commit();
	}
	}

	void visit(const G1HeapSummary* g1_heap_summary) const {
	visit((GCHeapSummary*)g1_heap_summary);

	EventG1HeapSummary e;
	if (e.should_commit()) {
	e.set_gcId(GCId::current());
	e.set_when((u1)_when);
	e.set_edenUsedSize(g1_heap_summary->edenUsed());
	e.set_edenTotalSize(g1_heap_summary->edenCapacity());
	e.set_survivorUsedSize(g1_heap_summary->survivorUsed());
	e.set_oldGenUsedSize(g1_heap_summary->oldGenUsed());
	e.set_numberOfRegions(g1_heap_summary->numberOfRegions());
	e.commit();
	}
	}

	void visit(const PSHeapSummary* ps_heap_summary) const {
	visit((GCHeapSummary*)ps_heap_summary);

	const VirtualSpaceSummary& old_summary = ps_heap_summary->old();
	const SpaceSummary& old_space = ps_heap_summary->old_space();
	const VirtualSpaceSummary& young_summary = ps_heap_summary->young();
	const SpaceSummary& eden_space = ps_heap_summary->eden();
	const SpaceSummary& from_space = ps_heap_summary->from();
	const SpaceSummary& to_space = ps_heap_summary->to();

	EventPSHeapSummary e;
	if (e.should_commit()) {
	e.set_gcId(GCId::current());
	e.set_when((u1)_when);

	e.set_oldSpace(to_struct(ps_heap_summary->old()));
	e.set_oldObjectSpace(to_struct(ps_heap_summary->old_space()));
	e.set_youngSpace(to_struct(ps_heap_summary->young()));
	e.set_edenSpace(to_struct(ps_heap_summary->eden()));
	e.set_fromSpace(to_struct(ps_heap_summary->from()));
	e.set_toSpace(to_struct(ps_heap_summary->to()));
	e.commit();
	}
	}
	};

	void GCTracer::send_gc_heap_summary_event(GCWhen::Type when, const GCHeapSummary& heap_summary) const {
	GCHeapSummaryEventSender visitor(when);
	heap_summary.accept(&visitor);
	}

	static JfrStructMetaspaceSizes to_struct(const MetaspaceStats& sizes) {
	JfrStructMetaspaceSizes meta_sizes;
	meta_sizes.set_committed(sizes.committed());
	meta_sizes.set_used(sizes.used());
	meta_sizes.set_reserved(sizes.reserved());
	return meta_sizes;
	}

	void GCTracer::send_meta_space_summary_event(GCWhen::Type when, const MetaspaceSummary& meta_space_summary) const {
	EventMetaspaceSummary e;
	if (e.should_commit()) {
	e.set_gcId(GCId::current());
	e.set_when((u1) when);
	e.set_gcThreshold(meta_space_summary.capacity_until_GC());
	e.set_metaspace(to_struct(meta_space_summary.stats())); // total stats (class + nonclass)
	e.set_dataSpace(to_struct(meta_space_summary.stats().non_class_space_stats())); // "dataspace" aka non-class space
	e.set_classSpace(to_struct(meta_space_summary.stats().class_space_stats()));
	e.commit();
	}
	}

	class PhaseSender : public PhaseVisitor {
	void visit_pause(GCPhase* phase) {
	assert(phase->level() < PhasesStack::PHASE_LEVELS, "Need more event types for PausePhase");

	switch (phase->level()) {
	case 0: send_phase<EventGCPhasePause>(phase); break;
	case 1: send_phase<EventGCPhasePauseLevel1>(phase); break;
	case 2: send_phase<EventGCPhasePauseLevel2>(phase); break;
	case 3: send_phase<EventGCPhasePauseLevel3>(phase); break;
	case 4: send_phase<EventGCPhasePauseLevel4>(phase); break;
	default: /* Ignore sending this phase */ break;
	}
	}

	void visit_concurrent(GCPhase* phase) {
	assert(phase->level() < 3, "There are only three levels for ConcurrentPhase");

	switch (phase->level()) {
	case 0: send_phase<EventGCPhaseConcurrent>(phase); break;
	case 1: send_phase<EventGCPhaseConcurrentLevel1>(phase); break;
	case 2: send_phase<EventGCPhaseConcurrentLevel2>(phase); break;
	default: /* Ignore sending this phase */ break;
	}
	}

	public:
	template<typename T>
	void send_phase(GCPhase* phase) {
	T event(UNTIMED);
	if (event.should_commit()) {
	event.set_gcId(GCId::current());
	event.set_name(phase->name());
	event.set_starttime(phase->start());
	event.set_endtime(phase->end());
	event.commit();
	}
	}

	void visit(GCPhase* phase) {
	if (phase->type() == GCPhase::PausePhaseType) {
	visit_pause(phase);
	} else {
	assert(phase->type() == GCPhase::ConcurrentPhaseType, "Should be ConcurrentPhaseType");
	visit_concurrent(phase);
	}
	}
	};

	void GCTracer::send_phase_events(TimePartitions* time_partitions) const {
	PhaseSender phase_reporter;

	TimePartitionPhasesIterator iter(time_partitions);
	while (iter.has_next()) {
	GCPhase* phase = iter.next();
	phase->accept(&phase_reporter);
	}
	}

	#if INCLUDE_JFR
	Ticks GCLockerTracer::_needs_gc_start_timestamp;
	volatile jint GCLockerTracer::_jni_lock_count = 0;
	volatile jint GCLockerTracer::_stall_count = 0;

	bool GCLockerTracer::is_started() {
	return _needs_gc_start_timestamp != Ticks();
	}

	void GCLockerTracer::start_gc_locker(const jint jni_lock_count) {
	assert(SafepointSynchronize::is_at_safepoint(), "sanity");
	assert(!is_started(), "sanity");
	assert(_jni_lock_count == 0, "sanity");
	assert(_stall_count == 0, "sanity");
	if (EventGCLocker::is_enabled()) {
	_needs_gc_start_timestamp.stamp();
	_jni_lock_count = jni_lock_count;
	}
	}

	void GCLockerTracer::inc_stall_count() {
	if (is_started()) {
	_stall_count++;
	}
	}

	void GCLockerTracer::report_gc_locker() {
	if (is_started()) {
	EventGCLocker event(UNTIMED);
	if (event.should_commit()) {
	event.set_starttime(_needs_gc_start_timestamp);
	event.set_endtime(_needs_gc_start_timestamp);
	event.set_lockCount(_jni_lock_count);
	event.set_stallCount(_stall_count);
	event.commit();
	}
	// reset
	_needs_gc_start_timestamp = Ticks();
	_jni_lock_count = 0;
	_stall_count = 0;

	assert(!is_started(), "sanity");
	}
	}
	#endif