> Does it show js stack traces?

Yes. perf has JIT support. When the Node runtime flag is enabled the app will 
produce a .map file which contains the memory address and instruction 
information necessary to fill in the blanks.

> Is it possibly to apply this for a already running app?

AFAIK the application must be started with the correct option. Though there may 
be an API that allows the user to toggle this functionality. If not, then it 
would be useful to create a ticket upstream to support it.

> Without using perf record ?

This one confuses me. perf record is what allows you to collect the data 
necessary to create the flame graph. Unless you use dtrace. Those are the only 
two options I know of so far.

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