diff --git a/libkineto/include/ActivityType.h b/libkineto/include/ActivityType.h
index 6a377d29e..729f2d5b2 100644
--- a/libkineto/include/ActivityType.h
+++ b/libkineto/include/ActivityType.h
@@ -10,12 +10,13 @@
 namespace libkineto {
 
 enum class ActivityType {
-    CPU_OP,
+    CPU_OP = 0, // cpu side ops
     GPU_MEMCPY,
     GPU_MEMSET,
-    CONCURRENT_KERNEL,
+    CONCURRENT_KERNEL, // on-device kernels
     EXTERNAL_CORRELATION,
-    CUDA_RUNTIME
+    CUDA_RUNTIME, // host side cuda runtime events
+    CPU_INSTANT_EVENT, // host side point-like events
 };
 
 } // namespace libkineto
diff --git a/libkineto/include/GenericTraceActivity.h b/libkineto/include/GenericTraceActivity.h
index d759241be..a6c367c92 100644
--- a/libkineto/include/GenericTraceActivity.h
+++ b/libkineto/include/GenericTraceActivity.h
@@ -65,6 +65,8 @@ struct GenericTraceActivity : TraceActivity {
     return fmt::format("{}", fmt::join(metadata_, ", "));
   }
 
+  virtual ~GenericTraceActivity() {};
+
   int64_t startTime{0};
   int64_t endTime{0};
   int64_t correlation{0};
diff --git a/libkineto/src/ActivityTrace.h b/libkineto/src/ActivityTrace.h
index a10a25cfc..37cc89525 100644
--- a/libkineto/src/ActivityTrace.h
+++ b/libkineto/src/ActivityTrace.h
@@ -30,7 +30,7 @@ class ActivityTrace : public ActivityTraceInterface {
 
   void save(const std::string& path) override {
     ChromeTraceLogger chrome_logger(path, cuptiActivities_.smCount());
-    return logger_->log(chrome_logger);
+    logger_->log(chrome_logger);
   };
 
  private:
diff --git a/libkineto/src/output_json.cpp b/libkineto/src/output_json.cpp
index f424b9e23..50577329e 100644
--- a/libkineto/src/output_json.cpp
+++ b/libkineto/src/output_json.cpp
@@ -184,6 +184,25 @@ static std::string traceActivityJson(const TraceActivity& activity, std::string
   // clang-format on
 }
 
+void ChromeTraceLogger::handleGenericInstantEvent(
+    const libkineto::GenericTraceActivity& op) {
+  if (!traceOf_) {
+    return;
+  }
+
+  traceOf_ << fmt::format(R"JSON(
+  {{
+    "ph": "i", "s": "t", "name": "{}",
+    "pid": {}, "tid": {},
+    "ts": {},
+    "args": {{
+      {}
+    }}
+  }},)JSON",
+      op.name(), op.deviceId(), op.resourceId(),
+      op.timestamp(), op.getMetadata());
+}
+
 void ChromeTraceLogger::handleCpuActivity(
     const libkineto::GenericTraceActivity& op,
     const TraceSpan& span) {
@@ -191,6 +210,11 @@ void ChromeTraceLogger::handleCpuActivity(
     return;
   }
 
+  if (op.activityType == ActivityType::CPU_INSTANT_EVENT) {
+    handleGenericInstantEvent(op);
+    return;
+  }
+
   auto op_metadata = op.getMetadata();
   std::string separator = "";
   if (op_metadata.find_first_not_of(" \t\n") != std::string::npos) {
@@ -201,9 +225,9 @@ void ChromeTraceLogger::handleCpuActivity(
   {{
     "ph": "X", "cat": "Operator", {},
     "args": {{
-       "Device": {}, "External id": {},
-       "Trace name": "{}", "Trace iteration": {} {}
-       {}
+      "Device": {}, "External id": {},
+      "Trace name": "{}", "Trace iteration": {} {}
+      {}
     }}
   }},)JSON",
       traceActivityJson(op, ""),
@@ -216,8 +240,8 @@ void ChromeTraceLogger::handleCpuActivity(
 }
 
 void ChromeTraceLogger::handleGenericActivity(
-      const GenericTraceActivity& op) {
-    if (!traceOf_) {
+    const GenericTraceActivity& op) {
+  if (!traceOf_) {
     return;
   }
 
diff --git a/libkineto/src/output_json.h b/libkineto/src/output_json.h
index 7aa0934ea..ba7c1e48d 100644
--- a/libkineto/src/output_json.h
+++ b/libkineto/src/output_json.h
@@ -78,6 +78,8 @@ class ChromeTraceLogger : public libkineto::ActivityLogger {
 
   void openTraceFile();
 
+  void handleGenericInstantEvent(const GenericTraceActivity& op);
+
   std::string fileName_;
   std::ofstream traceOf_;