Does perf script pipeline support process groupings?

[gedalia]

I’m using perf record to capture a whole system trace. But the UI only shows process 0. Is this a flaw in how I’m using perf or a limitation in the profiler.
Any sort of best practices for capturing desktop traces would be really helpful.

[mstange]

In the profile you captured, are the other threads listed in the thread list dropdown? The UI hides "inactive" threads by default.

As for best practices, the current plan is to put more work into samply and then recommend it instead of perf once it's more fleshed out.

[gedalia]

All the threads in the entire machine are grouped under Process 0, it shows the 5 most busy threads. But I have hundreds of less active ones. I was thinking this might be a problem where perf doesn't provide process level data, sounds like that is the case. Wasn't sure there was a better way to do this.

[julienw]

Can you please share the perf commands you use?
From the perf converter, we're supposed to keep the pid information, but possibly our regexp needs to be adjusted or your perf commands is missing some arguments. See for example the perf script invocation we're mentioning in https://profiler.firefox.com/docs/#/./guide-perf-profiling?id=step-2-convert-the-profile.

[gedalia]

ah, I missed that note, I was just doing perf script -i perf.data > output.txt
I'll try that