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import tuned.monitors
import os
class DiskMonitor(tuned.monitors.Monitor):
_supported_vendors = ["ATA", "SCSI"]
@classmethod
def _init_available_devices(cls):
block_devices = os.listdir("/sys/block")
available = set(filter(cls._is_device_supported, block_devices))
cls._available_devices = available
for d in available:
cls._load[d] = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
@classmethod
def _is_device_supported(cls, device):
vendor_file = "/sys/block/%s/device/vendor" % device
try:
vendor = open(vendor_file).read().strip()
except IOError:
return False
return vendor in cls._supported_vendors
@classmethod
def update(cls):
for device in cls._updating_devices:
cls._update_disk(device)
@classmethod
def _update_disk(cls, dev):
with open("/sys/block/" + dev + "/stat") as statfile:
cls._load[dev] = list(map(int, statfile.read().split()))