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lisa.wa: Add collector for sysfs-extractor

Darryl Green requested to merge github/fork/vdonnefort/wa-sysfs-extractor into master

Created by: vdonnefort

WA has a sysfs-extractor which copies the content of a folder before, after and generates a diff of it. The collector 'sysfs-extractor' leverages those artifacts.

Here's an example for the Pixel6 energy meters:

def pixel6_energy_meter(df): # Keep only CPU's meters df = df[df.value.str.contains('S4M_VDD_CPUCL0|S3M_VDD_CPUCL1|S2M_VDD_CPUCL2')] df[['variable', 'value']] = df.value.str.split(', ', expand=True) df['unit'] = "bogo-joules"

return df

df = WAOutput('pixel6/wa_output').get_collector( 'sysfs-extractor', path='/sys/bus/iio/devices/iio:device0/energy_value', df_postprocess=pixel6_energy_meter ).df

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