"""
What's eating the battery life of my laptop? Why isn't it many more
hours? Which software component causes the most power to be burned?
These are important questions without a good answer... until now.
"""
import os
import time
from autotest.client import utils, profiler
[docs]class powertop(profiler.profiler):
version = 1
preserve_srcdir = True
# filenames: list of filenames to cat
[docs] def setup(self, *args, **dargs):
os.chdir(self.srcdir)
utils.make()
[docs] def start(self, test):
self.child_pid = os.fork()
if self.child_pid: # parent
return None
else: # child
powertop = os.path.join(self.srcdir, 'powertop') + ' -d'
outputfile = os.path.join(test.profdir, 'powertop')
while True:
output = open(outputfile, 'a')
output.write(time.asctime() + '\n')
data = utils.system_output('%s >> %s' % (powertop, outputfile))
output.write(data)
output.write('\n=========================\n')
output.close()
[docs] def stop(self, test):
os.kill(self.child_pid, 15)
[docs] def report(self, test):
return None