blob: 8a6e9b4c20295a23b3e035b08bbf4504ac2d0595 [file] [log] [blame]
# Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
import hashlib, logging, multiprocessing, os, re, time
from autotest_lib.client.bin import test, utils
from autotest_lib.client.common_lib import error
from autotest_lib.client.cros import sys_power
PROC_STAT_CPU_FIELDS = ['user', 'nice', 'system', 'idle', 'iowait', 'irq',
'softirq', 'steal', 'guest', 'guest_nice']
PROC_STAT_CPU_IDLE_FIELDS = ['idle', 'iowait']
SYSFS_CPUQUIET_ENABLE = '/sys/devices/system/cpu/cpuquiet/tegra_cpuquiet/enable'
def cpu_stress():
sha512_hash = open('/dev/urandom', 'r').read(64)
while True:
sha512_hash = hashlib.sha512(sha512_hash).digest()
def get_system_times():
proc_stat = utils.read_file('/proc/stat')
for line in proc_stat.split('\n'):
if line.startswith('cpu '):
times = line[4:].strip().split(' ')
times = [int(jiffies) for jiffies in times]
return dict(zip(PROC_STAT_CPU_FIELDS, times))
def get_avg_cpu_usage(pre_times, post_times):
diff_times = {}
for field in PROC_STAT_CPU_FIELDS:
diff_times[field] = post_times[field] - pre_times[field]
idle_time = sum(diff_times[field] for field in PROC_STAT_CPU_IDLE_FIELDS)
total_time = sum(diff_times[field] for field in PROC_STAT_CPU_FIELDS)
return float(total_time - idle_time) / total_time
def sleep_and_measure_cpu(sleep_seconds):
pre_times = get_system_times()
post_times = get_system_times()
avg_cpu_usage = get_avg_cpu_usage(pre_times, post_times)'average CPU utilization, last %ds: %s%%',
sleep_seconds, avg_cpu_usage * 100.)
return avg_cpu_usage
class power_HotCPUSuspend(test.test):
"""Suspend the system with 100% CPU usage."""
version = 1
def initialize(self):
# Store the setting if the system has CPUQuiet feature
if os.path.exists(SYSFS_CPUQUIET_ENABLE):
self.is_cpuquiet_enabled = utils.read_file(SYSFS_CPUQUIET_ENABLE)
utils.write_one_line(SYSFS_CPUQUIET_ENABLE, '0')
def run_once(self):
# create processs pool with enough workers to spin all CPUs
cpus = multiprocessing.cpu_count()'found %d cpus', cpus)
workers = max(16, cpus * 2)
pool = multiprocessing.Pool(workers)
# fill all CPUs with a spinning task'starting %d workers', workers)
results = [pool.apply_async(cpu_stress) for _ in xrange(workers)]
# wait for things to settle'spinning for %d seconds', SUSPEND_BURN_SECONDS)
if sleep_and_measure_cpu(SUSPEND_BURN_SECONDS) < MIN_CPU_USAGE:
# There should be no idle time accounted while we're spinning.
raise error.TestError('unexpected CPU idle time while spinning')
# go to suspend
# keep spinning after userland resumes'spinning for %d more seconds', RESUME_BURN_SECONDS)
if sleep_and_measure_cpu(RESUME_BURN_SECONDS) < MIN_CPU_USAGE:
# There should be no idle time accounted while we're spinning.
raise error.TestError('unexpected CPU idle time after resume')
# check workers: if computation completed, something is wrong
for result in results:
if result.ready():
logging.error('worker finished: %s', result.get())
raise error.TestError('worker terminated!')
# kill off the workers'killing %d workers', workers)
def cleanup(self):
# Restore the original setting if system has CPUQuiet feature
if os.path.exists(SYSFS_CPUQUIET_ENABLE):
SYSFS_CPUQUIET_ENABLE, self.is_cpuquiet_enabled)