/usr/lib/python2.7/dist-packages/perfmon/session.py is in python-libpfm4 4.7.0-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Copyright (c) 2008 Google, Inc.
# Contributed by Arun Sharma <arun.sharma@google.com>
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sublicense,
# and/or sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
# OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
# ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
# OTHER DEALINGS IN THE SOFTWARE.
#
from perfmon import *
import os
import sys
# Common base class
class Session:
def __init__(self, events):
self.system = System()
self.event_names = events
self.events = []
self.fds = []
for e in events:
err, encoding = pfm_get_perf_event_encoding(e, PFM_PLM0 | PFM_PLM3,
None, None)
self.events.append(encoding)
def __del__(self):
pass
def read(self, fd):
# TODO: determine counter width
return os.read(fd, 8)
class SystemWideSession(Session):
def __init__(self, cpus, events):
self.cpus = cpus
Session.__init__(self, events)
def __del__(self):
Session.__del__(self)
def start(self):
self.cpu_fds = []
for c in self.cpus:
self.cpu_fds.append([])
cur_cpu_fds = self.cpu_fds[-1]
for e in self.events:
cur_cpu_fds.append(perf_event_open(e, -1, c, -1, 0))
def read(self, c, i):
index = self.cpus.index(c)
return Session.read(self, self.cpu_fds[index][i])
class PerThreadSession(Session):
def __init__(self, pid, events):
self.pid = pid
Session.__init__(self, events)
def __del__(self):
Session.__del__(self)
def start(self):
for e in self.events:
self.fds.append(perf_event_open(e, self.pid, -1, -1, 0))
def read(self, i):
return Session.read(self, self.fds[i])
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