sascha/workload-automation
1
0
Fork 0
mirror of https://github.com/ARM-software/workload-automation.git synced 2025-01-18 20:11:20 +00:00
Code Issues Releases Wiki Activity

minor fixes to cpufreq APIs

Browse Source 
- adding missing cpu id conversion to set_cpu_min_freq
- adding "exact" parameter to set_cpu_frequency; only produce an error
  when the specified frequency is not supported by the cpu if "axact"
  is set; (otherwise let cpufreq decide what the actual frequency will
  be).
This commit is contained in:
Sergei Trofimov 2015-05-11 11:53:36 +01:00
parent fbde403f6f
commit 40bd32280a
1 changed files with 15 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
wlauto/common/linux/device.py
View File

@ -486,6 +486,8 @@ class BaseLinuxDevice(Device): # pylint: disable=abstract-method
:raises: DeviceError if for some reason the frequency could not be read.
"""
if isinstance(cpu, int):
cpu = 'cpu{}'.format(cpu)
sysfile = '/sys/devices/system/cpu/{}/cpufreq/scaling_min_freq'.format(cpu)
return self.get_sysfile_value(sysfile)
@ -533,17 +535,19 @@ class BaseLinuxDevice(Device): # pylint: disable=abstract-method
sysfile = '/sys/devices/system/cpu/{}/cpufreq/scaling_cur_freq'.format(cpu)
return self.get_sysfile_value(sysfile)
def set_cpu_frequency(self, cpu, frequency):
def set_cpu_frequency(self, cpu, frequency, exact=True):
"""
Set's the minimum value for CPU frequency. Actual frequency will
depend on the Governor used and may vary during execution. The value should be
either an int or a string representing an integer. The Value must also be
supported by the device. The available frequencies can be obtained by calling
either an int or a string representing an integer.
If ``exact`` flag is set (the default), the Value must also be supported by
the device. The available frequencies can be obtained by calling
get_available_frequencies() or examining
/sys/devices/system/cpu/cpuX/cpufreq/scaling_available_frequencies
on the device.
on the device (if it exists).
:raises: ConfigError if the frequency is not supported by the CPU.
:raises: DeviceError if, for some reason, frequency could not be set.
@ -551,19 +555,20 @@ class BaseLinuxDevice(Device): # pylint: disable=abstract-method
"""
if isinstance(cpu, int):
cpu = 'cpu{}'.format(cpu)
available_frequencies = self.list_available_cpu_frequencies(cpu)
try:
value = int(frequency)
if available_frequencies and value not in available_frequencies:
raise ConfigError('Can\'t set {} frequency to {}\nmust be in {}'.format(cpu,
value,
available_frequencies))
if exact:
available_frequencies = self.list_available_cpu_frequencies(cpu)
if available_frequencies and value not in available_frequencies:
raise ConfigError('Can\'t set {} frequency to {}\nmust be in {}'.format(cpu,
value,
available_frequencies))
if self.get_cpu_governor(cpu) != 'userspace':
raise ConfigError('Can\'t set {} frequency; governor must be "userspace"'.format(cpu))
sysfile = '/sys/devices/system/cpu/{}/cpufreq/scaling_setspeed'.format(cpu)
self.set_sysfile_value(sysfile, value, verify=False)
except ValueError:
raise ValueError('value must be an integer; got: "{}"'.format(value))
raise ValueError('frequency must be an integer; got: "{}"'.format(value))
def get_cpu_max_frequency(self, cpu):
"""