* no

* maintain old profiler

* fix old dygraph record event

* no

* fix bugs

* fix doc according to review

* fix api doc format

* fix api doc according to review

* fix bug and add unit test

* fix record event bug

* optimize chrome tracing display

* fix bug

* add comment

* add unit test

* fix a bug

* fix

* fix

* fix format

* add new profiler components

* fix bug

* upgrade new profiler

* fix operator.cc

* fix operator.cc

* fix cmakelists.txt

* fix bug

* fix according to pr

* fix bug

* fix cmake

* fix bug

* fix a bug

* fix bug

* fix bug

* add event node implementation

* modify profiler.stop interface

* fix according to review

* fix file mode

* modify class method name in event_node.cc

* modify LLONG_MAX to ULLONG_MAX

* fix ci error

* fix ci error