ftrace_event table in python API

[Jaeheon Lee]

Hi, 

I cannot retrieve any events from the ftrace_event table using the perfetto python API.

When I use the query 

select COUNT(*) from ftrace_event

in the sql embedded in the Perfetto UI, I get 1209622

However, Using the perfetto UI, I get

  COUNT(*)
0        0

as the result. The trace I am using is the example_android_trace_15s provided in the UI.

The code I used for the python API is 

from perfetto.trace_processor import TraceProcessor
tp = TraceProcessor(trace="example_android_trace_15s")
print(tp.query('select COUNT(*) from ftrace_event').as_pandas_dataframe())

I have tried updating the trace processor using TraceProcessorConfig, but got the same results. This was the same for all other traces as well. 

Thanks

[Lalit Maganti]

The Python API disables ftrace ingestion into the ftrace_event and raw tables by default to save memory.

You can reenable ingestion by setting the `ingest_ftrace_in_raw` option of TraceProcessorConfig to true. (see https://cs.android.com/android/platform/superproject/+/android14-qpr3-release:external/perfetto/python/perfetto/trace_processor/api.py;l=48?q=ftrace%20f:py%20f:perfetto).

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