def GetTopSamples(cls, file_name, number):
"""Parses the perf generated profile in |file_name| and returns a
{function: period} dict of the |number| hottests functions.
"""
assert os.path.exists(file_name)
with open(os.devnull, 'w') as devnull:
_InstallPerfHost()
report = subprocess.Popen([
android_profiling_helper.GetPerfhostName(), 'report',
'--show-total-period', '-U', '-t', '^', '-i', file_name
],
stdout=subprocess.PIPE,
stderr=devnull).communicate()[0]
period_by_function = {}
for line in report.split('\n'):
if not line or line.startswith('#'):
continue
fields = line.split('^')
if len(fields) != 5:
continue
period = int(fields[1])
function = fields[4].partition(' ')[2]
function = re.sub('<.*>', '', function) # Strip template params.
function = re.sub('[(].*[)]', '',
function) # Strip function params.
period_by_function[function] = period
if len(period_by_function) == number:
break
return period_by_function
def PullTrace(self):
symfs_dir = os.path.join(tempfile.gettempdir(),
os.path.expandvars('$USER-perf-symfs'))
if not os.path.exists(symfs_dir):
os.makedirs(symfs_dir)
required_libs = set()
# Download the recorded perf profile.
perf_profile = self._perf_instance.PullResult(symfs_dir)
required_libs = \
android_profiling_helper.GetRequiredLibrariesForPerfProfile(
perf_profile)
if not required_libs:
logging.warning(
'No libraries required by perf trace. Most likely there '
'are no samples in the trace.')
# Build a symfs with all the necessary libraries.
kallsyms = android_profiling_helper.CreateSymFs(self._device,
symfs_dir,
required_libs,
use_symlinks=False)
perfhost_path = binary_manager.FetchPath(
android_profiling_helper.GetPerfhostName(), 'x86_64', 'linux')
ui.PrintMessage('\nNote: to view the profile in perf, run:')
ui.PrintMessage(' ' + self._GetInteractivePerfCommand(
perfhost_path, perf_profile, symfs_dir, required_libs, kallsyms))
# Convert the perf profile into JSON.
perf_script_path = os.path.join(
os.path.dirname(os.path.abspath(__file__)), 'third_party',
'perf_to_tracing.py')
json_file_name = os.path.basename(perf_profile)
with open(os.devnull, 'w') as dev_null, \
open(json_file_name, 'w') as json_file:
cmd = [
perfhost_path, 'script', '-s', perf_script_path, '-i',
perf_profile, '--symfs', symfs_dir, '--kallsyms', kallsyms
]
if subprocess.call(cmd, stdout=json_file, stderr=dev_null):
logging.warning(
'Perf data to JSON conversion failed. The result will '
'not contain any perf samples. You can still view the '
'perf data manually as shown above.')
return None
return json_file_name
def _InstallPerfHost():
perfhost_name = android_profiling_helper.GetPerfhostName()
host = platform.GetHostPlatform()
if not host.CanLaunchApplication(perfhost_name):
host.InstallApplication(perfhost_name)
return binary_manager.FetchPath(perfhost_name, 'x86_64', 'linux')
