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lisa.trace: Use HRTxtTraceParser by default for .txt trace

Douglas Raillard requested to merge github/fork/douglas-raillard-arm/_home_pr151 into master

BREAKING CHANGE

Since text trace are typically in the human readable format (as opposed to the semi-machine readable raw output of trace-cmd report), use this by default for .txt extension.

If the old behaviour is still wanted, traces can be built with:

from lisa.trace import Trace, TxtTraceParser
Trace(..., parser=TxtTraceParser.from_txt_file)

The new behaviour is equivalent to:

from lisa.trace import Trace, HRTxtTraceParser
Trace(..., parser=HRTxtTraceParser.from_txt_file)

As a side effect, this will enable lisa-plot to work out of the box (to some extent) with such text trace.

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