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disk plugin: use sysfs fallback if cpupower is missing

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Signed-off-by: Jaroslav Škarvada <jskarvad@redhat.com>
This commit is contained in:
Jaroslav Škarvada 2013-03-01 11:10:16 +01:00
parent 7cc8345a8e
commit 03a53346b1
1 changed files with 36 additions and 11 deletions
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47
tuned/plugins/plugin_cpu.py
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@ -15,6 +15,11 @@ class CPULatencyPlugin(base.Plugin):
Plugin for tuning CPU options. Powersaving, governor, required latency, etc.
"""
def __init__(self, *args, **kwargs):
super(self.__class__, self).__init__(*args, **kwargs)
self._has_cpupower = True
def _init_devices(self):
self._devices = set()
# current list of devices
@ -33,6 +38,13 @@ class CPULatencyPlugin(base.Plugin):
"governor" : None,
}
def _check_cpupower(self):
if tuned.utils.commands.execute(["cpupower", "frequency-info"])[0] == 0:
self._has_cpupower = True
else:
self._has_cpupower = False
log.warning("using sysfs fallback, is cpupower installed?")
def _instance_init(self, instance):
instance._has_static_tuning = True
instance._has_dynamic_tuning = False
@ -49,6 +61,8 @@ class CPULatencyPlugin(base.Plugin):
else:
instance._load_monitor = None
# Check for cpupower, use workaround if not available
self._check_cpupower()
else:
instance._controls_latency = False
log.info("Latency settings from non-first CPU plugin instance '%s' will be ignored." % instance.name)
@ -99,22 +113,33 @@ class CPULatencyPlugin(base.Plugin):
@command_set("governor", per_device=True)
def _set_governor(self, governor, device):
log.info("setting governor '%s' on cpu '%s'" % (governor, device))
cpu_id = device.lstrip("cpu")
tuned.utils.commands.execute(["cpupower", "-c", cpu_id, "frequency-set", "-g", str(governor)])
if self._has_cpupower:
cpu_id = device.lstrip("cpu")
tuned.utils.commands.execute(["cpupower", "-c", cpu_id, "frequency-set", "-g", str(governor)])
else:
tuned.utils.commands.write_to_file("/sys/devices/system/cpu/%s/cpufreq/scaling_governor" % device, str(governor))
@command_get("governor")
def _get_governor(self, device):
governor = None
try:
if self._has_cpupower:
cpu_id = device.lstrip("cpu")
lines = tuned.utils.commands.execute(["cpupower", "-c", cpu_id, "frequency-info", "-p"])[1].splitlines()
for line in lines:
if line.startswith("analyzing"):
continue
(drop, drop, governor) = line.split()
break
except:
retcode, lines = tuned.utils.commands.execute(["cpupower", "-c", cpu_id, "frequency-info", "-p"]).splitlines()
if retcode == 0:
for line in lines:
if line.startswith("analyzing"):
continue
l = line.split()
if len(l) == 3:
governor = l[2]
break
else:
data = tuned.utils.commands.read_file("/sys/devices/system/cpu/%s/cpufreq/scaling_governor" % device, str(governor))
if len(data) > 0:
governor = data
if governor is None:
log.error("could not get current governor on cpu '%s'" % device)
governor = None
return governor