--- a/src/hotspot/share/jfr/recorder/checkpoint/jfrCheckpointWriter.cpp	Mon Aug 26 13:09:14 2019 +0200
+++ b/src/hotspot/share/jfr/recorder/checkpoint/jfrCheckpointWriter.cpp	Mon Aug 26 17:59:32 2019 +0200
@@ -30,11 +30,12 @@
 JfrCheckpointFlush::JfrCheckpointFlush(Type* old, size_t used, size_t requested, Thread* t) :
   _result(JfrCheckpointManager::flush(old, used, requested, t)) {}
 
-JfrCheckpointWriter::JfrCheckpointWriter() :
+JfrCheckpointWriter::JfrCheckpointWriter(JfrCheckpointMode mode /* NORMAL */) :
   JfrCheckpointWriterBase(JfrCheckpointManager::lease_buffer(Thread::current()), Thread::current()),
   _time(JfrTicks::now()),
   _offset(0),
   _count(0),
+  _mode(mode),
   _header(true) {
   assert(this->is_acquired(), "invariant");
   assert(0 == this->current_offset(), "invariant");
@@ -43,11 +44,12 @@
   }
 }
 
-JfrCheckpointWriter::JfrCheckpointWriter(Thread* t, bool header /* true */) :
+JfrCheckpointWriter::JfrCheckpointWriter(Thread* t, bool header /* true */, JfrCheckpointMode mode /* NORMAL */) :
   JfrCheckpointWriterBase(JfrCheckpointManager::lease_buffer(t), t),
   _time(JfrTicks::now()),
   _offset(0),
   _count(0),
+  _mode(mode),
   _header(header) {
   assert(this->is_acquired(), "invariant");
   assert(0 == this->current_offset(), "invariant");
@@ -56,11 +58,12 @@
   }
 }
 
-JfrCheckpointWriter::JfrCheckpointWriter(Thread* t, JfrBuffer* buffer) :
+JfrCheckpointWriter::JfrCheckpointWriter(Thread* t, JfrBuffer* buffer, JfrCheckpointMode mode /* NORMAL */) :
   JfrCheckpointWriterBase(buffer, t),
   _time(JfrTicks::now()),
   _offset(0),
   _count(0),
+  _mode(mode),
   _header(true) {
   assert(this->is_acquired(), "invariant");
   assert(0 == this->current_offset(), "invariant");
@@ -69,13 +72,13 @@
   }
 }
 
-static void write_checkpoint_header(u1* pos, int64_t size, jlong time, u4 type_count) {
+static void write_checkpoint_header(u1* pos, int64_t size, jlong time, u4 mode, u4 type_count) {
   assert(pos != NULL, "invariant");
   JfrBigEndianWriter be_writer(pos, sizeof(JfrCheckpointEntry));
   be_writer.write(size);
   be_writer.write(time);
   be_writer.write(JfrTicks::now().value() - time);
-  be_writer.write((u4)0); // not a flushpoint
+  be_writer.write(mode);
   be_writer.write(type_count);
   assert(be_writer.is_valid(), "invariant");
 }
@@ -98,7 +101,7 @@
   assert(this->used_size() > sizeof(JfrCheckpointEntry), "invariant");
   const int64_t size = this->current_offset();
   assert(size + this->start_pos() == this->current_pos(), "invariant");
-  write_checkpoint_header(const_cast<u1*>(this->start_pos()), size, _time, count());
+  write_checkpoint_header(const_cast<u1*>(this->start_pos()), size, _time, _mode, count());
   release();
 }
 
@@ -156,7 +159,7 @@
   }
   *size = this->used_size();
   assert(this->start_pos() + *size == this->current_pos(), "invariant");
-  write_checkpoint_header(const_cast<u1*>(this->start_pos()), this->used_offset(), _time, count());
+  write_checkpoint_header(const_cast<u1*>(this->start_pos()), this->used_offset(), _time, _mode, count());
   _header = false; // the header is already written
   if (move) {
     this->seek(_offset);